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At present, petrochemical based biodegradable plastics with promising development prospects include PBAT (co-polyester of terephthalic acid, adipic acid and BDO), PBS(co-polyester of succinic acid and BDO), and PBST (co-polyester of succinic acid, terephthalic acid and BDO). It is estimated that the demand for total biodegradable plastics in China is about 20 million tons/year, and the annual demand for terephthalic acid, adipic acid, succinic acid and BDO is about 1 million tons. At present, terephthalic acid, adipic acid and BDO already have the large-scale production technology, which can meet the large demand of biodegradable plastics in the future.  However, the yield of succinic acid is seriously insufficient in China, which severely limits the rapid development of biodegradable plastics industry.

Succinic acid, also known as succinic acid, is an important binary carboxylic acid, which is widely used in medicine, food, synthetic plastics, biodegradable plastics and other fields. Succinic acid and 1,4-butanediol (BDO) are the core raw materials for PBS production. At present, the relatively mature maleic anhydride hydrogenation process has the advantages of low operating cost, intrinsically safe production process, no waste discharge, clean production and good environmental benefits. Now, it is the best method to produce succinic anhydride/succinic acid with efficiency and economic benefit.

In the process of exploration, the most important thing is to develop a kind of high efficiency, good selective hydrogenation catalyst, researchers have done a lot of research work, which theoretically reveals the influence mechanism of the catalyst active component existence form and carrier on catalyst activity, selectivity and life. What’s more, the team has mastered the core technology of the preparation of the catalyst. The best catalyst for the directional synthesis of succinic anhydride with high activity, high selectivity and long service life for the hydrogenation of maleic anhydride was obtained. Of course, in the process of catalyst filtration and application, Shinkai catalyst filter plays a great role. The catalyst filter developed by Shinkai can be fully automatic closed operation, safe and environmental protection, can maximize the protection of catalyst activity, increase the life of the catalyst, and improve the economic benefits of the device.

At present, the production methods of the polysilicon industry mainly include the silane method and the modified Siemens method. The modified Siemens method and the silane method mainly produce solar-grade/electronic-grade crystalline silicon. The silane method is to pass silane into a fluidized bed with polycrystalline silicon seeds as fluidized particles, so that silane is cracked and deposited on the seeds, thereby obtaining granular polycrystalline silicon. The modified Siemens method is to generate silicon rods by vapor deposition after reduction of trichlorosilane after purification.

The modified Siemens method is the most common and mature method at home and abroad. The modified Siemens method is to use industrial silicon powder and hydrogen chloride to synthesize trichlorosilane, and then rectify and purify the trichlorosilane. The purified trichlorosilane and high-purity hydrogen undergo a reduction reaction in a reduction furnace and vapor deposition to generate high-purity polysilicon. However, during the reduction of trichlorosilane, a large amount of by-product silicon tetrachloride will be produced, and a large amount of amorphous silicon powder will also be produced in the reduction furnace. In the modified Siemens method, the generated silicon tetrachloride and amorphous silicon powder enter the tail gas recovery system, thereby separating the amorphous silicon powder, and the silicon tetrachloride enters the next step of rectification and separation.

The on-line filtration system for exhaust silicon powder developed by Shinkai with metal membrane filter element as the core, including on-line silicon powder filter, silicon powder collection tank and on-line operating system, can completely intercept the amorphous silicon powder through high-precision filter elements, thereby greatly reducing the maintenance frequency of the downstream system equipment, providing guarantee for the stable operation of the downstream system, and improving the efficiency of material utilization.

In addition, the Siemens method is improved to add a cold hydrogenation device to treat the by-product silicon tetrachloride, that is, silicon tetrachloride and hydrogen are mixed and heated, and then passed into a cold hydrogenation fluidized bed reactor to react with the industrial silicon powder added to generate trichlorosilane. Since this process uses a fluidized bed reaction, it is inevitable that a large amount of fine silicon powder will enter the rear system with the reaction gas, and this part of the silicon powder will enter the rear system, which will wear and block the pipeline equipment, and also increase the difficulty of slag slurry recovery, resulting in a decrease in material recovery rate, material loss and increased environmental protection pressure. At present, the above-mentioned fine silicon powder is separated by designing a three-stage cyclone after the cold hydrogenation fluidized bed reactor, but the separation effect of fine silicon powder with fine particles is not good.

The cold hydrogenated silicon powder on-line filtration system developed by Shinkai includes high-temperature silicon powder on-line filter, high-pressure silicon powder hopper, silicon powder collection tank, supporting heat tracing and on-line detection system. With the characteristics of high temperature, thermal shock, precise control of pore size, easy regeneration of components, and low overall pressure difference of the filtration system, the separation of the above-mentioned fine silica powder can achieve excellent separation effect.

At present, the silicon powder filtration system developed and produced by our company has been widely used in the silicon industry and has solved many filtration and separation problems and has been widely praised by customers. The company has developed improved Siemens method, silane method, electronic-grade polysilicon full-process filtration solutions, and developed multiple sets of silicon powder filtration systems in organic silicon, silica and industrial silicon. Many clients’ cases could be found in our page of Partners, if you have any doubts of poly-silicone filtration, please contact we Shinkai.

Nuclear reactors in power plants use a large amount of fission nuclear fuel uranium. There are mainly three isotopes in the nature: U-238, U-235 and U-234, of which fissionable U-235 is currently the main nuclear fuel used now. However, the characteristics of natural uranium ore are low grade, scattered ore body and small scale in quantity. Normally if the uranium content is higher than 0.05%, that would be with mining value. So how does uranium go from ore to the usable nuclear fuel? Now let’s look at that how nuclear fuel is “Refined”.

After the uranium ore is mined, it is crushed and ground into fine powder, and the useful components in the ore are converted into soluble compounds by chemical reagents, and then selectively dissolved to obtain a solution containing the useful components. Uranium is then purified and recovered from the ore leachate. The obtained chemical concentrate, this primary product has a bright yellow color, so it is also called “yellow cake”, which is generally diuranate or uranyl tricarbonate. Further purification and transformation work is required. The uranium concentrate is refined and nuclear-pure uranium compounds are obtained. At present, the solvent extraction method has completely replaced the precipitation method adopted earlier.

First, the “yellow cake” is dissolved in nitric acid to produce a solution of uranyl nitrate. The diuranate solid prepared by hydrometallurgy dissolves very quickly in nitric acid, and only a small amount of residue remains after the reaction. The undissolved residue was removed by filtration, and the filtered solution contained excess nitric acid and nitrates.

Resolvent extraction method is used for purification. At present, uranium refineries have adopted the TBP extraction process. TBH has the characteristics of low volatility, chemical stability and large extraction capacity. After washing the uranium-loaded organic phase with water, the uranium is back-extracted with slightly acidic hot water to obtain a nuclear-pure uranyl nitrate solution.

Then, the extracted and purified uranium is reacted with uranyl nitrate and ammonia to produce ammonia diuranate precipitation, and then uranium trioxide is obtained through processes such as filtration, drying and calcination. Uranium dioxide is obtained by hydrogenation reduction, which can be used as a raw material for the production of other uranium compounds, and can also be directly used as a nuclear reactor dye, but as a reactor dye directly, the reduction reaction requires a higher temperature to produce denser uranium dioxide.

Uranium hexafluoride is the raw material for the separation of uranium isotopes. When preparing uranium hexafluoride, it is necessary to react uranium dioxide and hydrogen fluoride at 500 °C to obtain uranium tetrafluoride first, and then react with fluorine at 300~350 °C to obtain uranium hexafluoride. Several uranium isotope separation methods currently in practice use uranium hexafluoride as the working medium. However, whether it is a product or a tailing material, it must be converted into a material in the form of uranium dioxide for use as a nuclear dye. Therefore, both the production and reduction of UF6 are called transformations.

In the extraction purification and high temperature reaction, the special alloy Monel®-400, Inconel®-600 and 316L  produced by Nanjing Shinkai are used. It is also widely used in the treatment of nuclear waste and water filtration.

In the extraction purification, high temperature reaction and harsh chemical environment, the special nickel alloy Monel®-400, Inconel®-600, and Hastelloy® C-276 porous metal membrane  (sometimes SS304L) produced by Nanjing Shinkai could be used to achieve the corrosive resistant. It is also widely used in the treatment of nuclear wastewater filtration or corrosive gases like HF(Hydrofluoric Acid). The standard micron grade or minimum particle removal would be 5 micron or 20 micron, etc. For the dimensions of cylinder such as outside diameter, thickness, length and connection/ fittings, there’s no limitation, all cartridges could be customized based on clients’ request. Shinkai has full tool/ molds to meet different size requests.

Catalytic hydrogenation technology is the core technology in medicine, fine chemical industry, and other organic synthesis. In the application of catalytic hydrogenation technology, noble metal catalysts with relatively high catalyst activity are mainly used, such as Palladium-carbon catalysts, Raney nickel catalysts, etc. At this stage, precious metal catalysts used in industrial production and research work are mainly divided into the following categories:

1. Nickel-based catalyst.
2. Palladium-based catalyst.
3. Platinum catalysts.
4. Copper catalysts.
5. Activated carbon/carrier material.

Precious metal catalysts are one of the main cost sources in catalytic hydrogenation, so the separation and recovery of catalysts have become the key to controlling the operating costs of catalyst  hydrogenation. And in the actual production process, there may also be problems such as catalyst leakage, so an efficient catalyst filtration method is required to filter and recover.

Shinkai is committed to the exploration and research in the field of filtration and separation and has independently developed the metal sintered filter membrane, which has impact resistance, high temperature resistance, strong corrosion resistance, good air permeability, good separation effect, and outstanding backwashing effect. Shinkai can design a filtration system that meets the continuous automatic production requirements of product filtration, catalyst application and withdrawal according to the customer’s operating conditions and special requirements.

Shinkai catalyst filtration and separation systems have been used in hundreds of sets of APIs, dye intermediates, chemical intermediates, resin intermediates, pesticides, spices, food additives and other fields in China and abroad. If you have questions about the filtration and separation of fine chemical production catalysts, Shinkai will serve you at any time, welcome to consult!

In the production of organic silicon monomer raw materials, as the end-product, high-purity dichloromethane/ DCM/ methylene chloride is very important. However, the production of DCM often contains a certain amount of impurity calcium chloride. Shinkai’s metal filter with sintered powder filter elements can perfectly filter and purify the DCM to 2ppm. In October, we just completed the transformation of a set of methylene chloride filter. Shinkai’s sintered metal filter cartridges successfully replaced the ceramic membranes, effectively reducing the number of backwashing, increase the service life of the filter.

Modified starch is made from natural starch by chemical or physical modification. Natural starch is a kind of natural polymer made from glucose condensation. It is a kind of renewable material with the most abundant source in nature. It can be degraded and is environmentally friendly.

As a food additive, modified starch has the advantages of safety and no side effects, so it is widely used in the food industry, as a thickener, stabilizer, gelling agent, binder and so on.

At present, chemical processing is the most widely used method of starch modification, which changes the gelatinization temperature, hydrolysis temperature and other characteristics of starch by introducing new functional groups into starch molecules. Chemical production of modified starch will produce many sewages containing starch fine particles, the traditional process uses Drum filter or Plate filter to deal with these sewages. These methods cannot recover the starch inside, at the same time, there is a problem of high COD after filtration.

By studying the characteristics of modified starch sewage, Shinkai has developed a set of precision filtration system with metal membrane filter element specially used for recovering starch from modified starch sewage. It can not only recover 100% of the modified starch in sewage, but also reduce the COD of sewage to the maximum extent. Above all, it can realize automatic control absolutely. At present, the system has been successfully applied in the world’s top modified starch production enterprises and has produced higher economic and environmental benefits.

With the development of the World’s industrial economy and population explosion, human beings are facing more and more serious environmental pollution problems, especially water pollution. In recent years, electrocatalytic oxidation technology has attracted great attention because of its great advantages in removing COD from industrial wastewater.

The key point of electrocatalytic technology is to develop an anode with high efficiency, long life, and high economy. Through independent research and development, Nanjing Shinkai has designed sintered porous titanium element as a carrier for electrocatalytic anode. This porous element does not precipitation metal ions like SS (stainless steel) elements, and has a strong binding force with precious metals, all above advantages greatly increased the service life of the positive electrode. At the same time, due to its special porous structure, the specific surface area of the electrode is much larger, and the catalytic efficiency is higher. In addition, the pore size of porous sintered metal is at the micron level, which can effectively intercept fine particles in water and protect other components in the electrode.

Now the porous titanium elements produced by Shinkai have been successfully applied in many sets of industrial wastewater treatment devices and achieved very good economic and social benefits for industrial wastewater processing plants.

The Tokyo Olympic Games, held one year late, have made many sports fans look forward to it for a long time, and the materials used to implement the principle of 3R hosting the Olympic Games are even more refreshing. Such as p polyurethane weightlifting equipment, running track, recycled plastic podium, etc. The green organic synthesis of these materials is inseparable from catalytic hydrogenation technology. Precious metal catalysts with high catalytic activity are generally used in catalytic hydrogenation technology, such as palladium carbon catalyst and Raney® nickel catalyst, which is the largest investment in hydrogenation unit.

On the one hand, the separation of catalyst after reaction is closely related to product quality. On the other hand, the recovery and reuse of precious metal catalyst can also save a lot of production costs for enterprises. Therefore, it is particularly critical to select a catalyst filtration and separation system with excellent performance.

For example, the new catalyst filtration and separation system designed and manufactured by Shinkai uses sintered metal filters as precision filter elements, which ensure 100% catalyst filtration and interception.

To obtain high-quality porous metal filters, Shinkai monitored the whole production process. And the excellent filtration equipment designed and manufactured by Shinkai is very suitable for the complete separation of various precious metal catalysts from mother liquor in fine chemical production. The filter’s process is simple to operate, easy to maintain, high temperature or solvents or corrosion resistance, with better strength, high precision, and can provide reliable and long-lasting filtration capabilities. In addition, Shinkai can design a filtration system to meet the continuous automatic production requirements of product filtration, catalyst application and withdrawal according to the service conditions and special requirements.

Shinkai’s new catalyst filtration and separation system has been successfully applied in the following production processes:

1. Dyes
C acid, 6-Chloro-m-toluidine-4-sulfonic acid, 3-amino-6-chlorotoluene-4-sulfonic acid, 5-amino-2-chlorotoluene-4-sulfonic acid, etc.;

2. Pesticide intermediates
3,4-Diaminophenethyl ether sulfate, 2-amino-4-nitrophenol-6-sulfonic acid, dimethyl chlorophthalic acid, 6-nitro-2-benzothiazolinone, 4-p-chloro Benzylamine, 4-amino-3-methylphenol, 4-nitro o-phenylenediamine, 4-nitro m-cresol, etc.;

3. Resin, nylon, elastic intermediate or additives
HDA, MDBA, aminodiphenylamine, DTBP, neopentyl glycol, butylene glycol, hydrogenated resin, etc.;

4. Food additives
Mannitol, sorbitol, xylitol, succinic acid, malic acid, fumaric acid, aspartic acid, etc.;

5. Chemical intermediates
Trimethylpyridine, acetanisole, dimethoxybenzoic acid, p-fluorobenzoic acid, methyl isopropyl ketone, etc.;

6. Herbicide intermediates
Fomesafen, imidazole nicotinic acid, triadimenol, 2,4-D dimethylamine salt, tebuconazole, etc.;

7. Pharmaceutical intermediates
Chloroaniline, methylcyclohexylamine, dichloroaniline, aminophenol, p-methoxyaniline, aminobenzene sulfonic acid, methyl ethyl ketone, etc.;

8. Nutrient chemical intermediates
Butyraldehyde, hydrogenated citral, tetrahydrogeranone, cyclopentenol, etc.

If you have any related fine chemical filtration and separation problems, Shinkai will serve you wholeheartedly, welcome to consult!

July 12, the reporter learns from Nanjing Shinkai Filter Co., Ltd that their hot gas filter system with metal filters has been successfully applied in polysilicon enterprises. That indicates the technology has been successfully applied in the polysilicon industry after its successful application in the lithium battery, graphene and other industries. This is of great significance to promoting the green, safe and environmental production of the polysilicon industry.

In the production of polysilicon, a large amount of silicon powder is produced in the cold hydrogenation and reduction unit. Due to the high hardness, small particle size, and large quantity of silicon powder, once it is entrained into the hot gas raw materials, it will cause blockage and wear or even make shutdown of the entire production device. “The hot gas filter with porous metal filters can intercept the silicon powder at the source of the device and guarantee the stable production of polysilicon. At present, this technology has been used in many polysilicon groups such as Tongwei Group, Daqo New Energy, East Hope, Jiangsu Zhongneng, etc. The successful application of the enterprise has produced excellent benefits.” said Wang Zaixiong, chairman of Nanjing Shinkai Filter Co., Ltd.

The hot gas filter with porous metal elements has been widely used in lithium battery, graphene, PTA, semiconductor, carbon fiber, oil refining, degradable plastics, organic silicon and other industries due to its characteristics of high temperature resistance, corrosion resistance, high precision and high degree of automation.

Gasoline, Kerosene and diesel are the important fuels, all those are sourcing from Petroleum Refining. Petroleum is usually named as “Blood of Industry”, but it is hardly used as above fuel directly, it must be re-processed to gasoline, kerosene or diesel for further human using. FCC Fluid catalytic cracking is the most important convert method for Petroleum to fuel gasoline, kerosene or diesel in refining plants.

Almost everyone knows that FCC is the key secondary processing unit of Petroleum reforming and the profitable unit in Refining plants. The status of FCC unit in refineries is declining caused by the hitting of Hydrogenation cracking technology development. As well as the pressure of environment protection & additional value increasing, how to improve the FCC process to keep it profitable becomes more and more urgent. And now FCC process meet two main problems.

Firstly, challenge of regenerated flue gas treatment.

The regenerated flue gas means the exhaust gas after fluidized bed regenerator. In addition to the acid gas such as CO2, there are also plenty of catalyst particles, which are easy to block and wear downstream heat exchangers and pump valves. Due to the high temperature and large volume of the regeneration flue gas, it is very difficult to completely remove the catalyst particles directly at the outlet of the regenerator.

Secondly, problem of the oil slurry treatment

The oil slurry is a by-product with very special properties produced during the catalytic cracking process. A large number of condensed aromatic hydrocarbons with short side chain in the slurry are used to produce High-quality raw materials for high value-added products such as carbon black, needle coke, carbon fiber, rubber softeners and filler oils, plasticizers, asphalt, and heat transfer oil, but deep processing requires low content of solid catalyst particles, the actual amounts of particles usually made the oil slurry restricted.

Currently, many oil refining plants in China are cooperating with Shinkai to solve above problems, based on our rich engineering experiences in high temperature gas-particles removal and residual oil filtration.

Treatment of regenerated flue gas, the particles can be removed by Shinkai’s high-temperature gas-solid on-line blowback filtration system. At present, in some more harsh operating conditions, Shinkai’s same series filters have been successfully operated for many years without any manual operation and after-sales maintenance, and pressure drop stable at 3-5kpa.

For the gas-solid on-line filter is suitable for continuous filtration operation system, filter is organized by several filter elements groups together, and can be cleaned by pulse jet device successively without dismantle filter equipment. The inside filter elements sintered metal filter cartridges are completely manufactured by Shinkai, and the total length could reach to 3 meter, and micron grade or pore size could be higher to 0.8 micron grade, with higher strength than ceramic material elements.

Treatment of oil slurry, it is difficult to filter the catalytic oil slurry, because there is a large amount of colloid, which will block the filter elements. Through continuous exploration and pilots, Shinkai developed a set of oil slurry purification crossflow filtration system, which can reduce the content of catalyst in the oil slurry from 4000ppm to 30ppm. The crossflow filter can self-clean the gum and filter cake on the inside surface of the filter element, which is not easy to be blocked for filter elements. At present, this system has been successfully used in a scaled state-owned refinery in China. The solid content of the filtered oil slurry is less than 2ppm, which increasing the possibility for further processing of the oil slurry.

As the crossflow filter, which offers inside-out filtration way and has the characteristic of continuous filtration cycle through cross flow. Material traverse both ends opened metal membrane element also called sinter metal filter cartridge, which are totally manufactured by Shinkai filter, with outside diameter around OD19mm to OD25mm, max length to 3 meters, micron grade could reach to 1 micron.

Currently the slurry oil from FCC unit could be used in Hydrogenation reactor, Needle coke, Carbon fiber, Marine fuel. 

If you have questions about FCC unit regeneration flue gas and oil slurry filtration, feel free to contact our application department. Or fill the datasheet and forward to us for further designing.