Adiponitrile CAS 111-69-3
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- Appearance: Colorless liquid
- Assay: 99. 0%min
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- Sample: Available
Adiponitrile: The Complete Guide
Index of Adiponitrile Contents
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Basic Info of Adiponitrile
Adipic acid dinitrile; hexanedinitrile; tetramethyl cyanide; adiponitrile Dangerous goods; 4-dicyanobutane; 1,4-dicyanobutane; adn adiponitrile
Catalysts And Auxiliaries
What is Adiponitrile?
Adiponitrile is an important organic chemical intermediate, mainly used in the production of polyhexamethylene adipamide (nylon 66), 1,6-hexamethylene diisocyanate (HDI) and nylon 610.
Adiponitrile is hydrogenated and reduced to form hexamethylene diamine, which is neutralized with adipic acid to obtain a translucent or opaque milky white synthetic resin (nylon 66), which has good wear resistance and heat resistance. , corrosion resistance and mechanical strength, widely used in chemical fiber and engineering plastics industry, especially in clothing, carpets, electrical appliances, automobiles, military and other fields are increasingly common. According to statistics, about 90% of adiponitrile in the world is used in the production of nylon 66 every year, and its cost accounts for about 40% to 50% of nylon 66.
The hydrogenation reduction of adiponitrile to form hexamethylene diamine, and the photochemical reaction of hexamethylene diamine to generate HDI (1,6-hexamethylene diisocyanate) is another important application for the development of the downstream product chain of adiponitrile.
- Adiponitrile is used as an additive for detergents, a spinning solvent for acrylonitrile, methacrylonitrile and methyl methacrylate terpolymers, a solvent for wet and dry spinning of polyvinyl chloride fibers, a colorant for polyamides, fabrics Bleach auxiliaries, acetate, propionate, butyrate and mixed ester plasticizers; as well as extractants for aromatic extraction, etc.
- Adiponitrile used as a chromatographic fixative.
- Adiponitrile is used in the production of nylon 66 and is widely used in the chemical fiber and engineering plastics industries, especially in the fields of clothing, carpets, electrical appliances, automobiles, and military industries.
Development Trend of Adiponitrile Production Technology
Adiponitrile is one of the indispensable raw materials for the production of nylon 66. At present, only a few well-known large companies in developed countries can produce them, including DuPont in the United States, Rhone Planck in France, Monsanto in the United States, BASF in Germany, Latisi Group in Italy, and Asahi Kasei in Japan. Technology is still in a state of high monopoly. At present, there is no industrial production plant for adiponitrile in China, and the demand for adiponitrile has been mostly dependent on imports. With the rapid development of my country’s nylon 66 industry, the demand for the intermediate hexamethylene diamine for the raw material adiponitrile has increased. It is estimated that in 2010 The annual output will reach 200,000 t/a.
At present, the process routes of several well-known large companies in the world for the production of adiponitrile mainly include acrylonitrile (AN) electrolytic dimerization method, adipic acid (ADA) catalytic ammoniation method and butadiene (BD) method. There is a lactam degradation and rehydrolysis process of Japan Toray Company.
The production process was successfully developed by Monsanto Company in the 1960s, and gradually developed from diaphragm electrolysis to non-diaphragm electrolysis. Diaphragm electrolysis method is divided into solution method and emulsion method. Monsanto Company adopted the solution method when it was first developed. Preparation of adiponitrile. Later, Japan’s Asahi Kasei Company developed the emulsion method on the basis of Monsanto Company. Acrylonitrile is emulsified in the catholyte with the help of emulsifier polyvinyl alcohol, electrolyte and other substances for dimerization.
The non-diaphragm electrolysis method, represented by VCB (Belgium Union Chemical Company), is a direct electrosynthesis process, and its electrolyte is an emulsion; considering that acrylonitrile does not participate in the anode reaction, the diaphragm is cancelled. BASF also uses a special capillary gap electrolytic cell to establish a non-diaphragm electrolytic cell. The electrolytic cell is composed of multiple graphite plates overlapping. The raw material propylene of the acrylonitrile hydrogenation dimerization method is cheap and easy to obtain, with high reaction selectivity and minimal pollution. If the process cost and factory investment are further reduced, the economic competitiveness of the method can be improved; however, this process route uses high toxicity , The highly corrosive raw material acrylonitrile is not an ideal process route.
This production process route was successfully developed by the French Rhone Planck Company in the late 1960s. This method is divided into gas phase method and liquid phase method. The gas phase method adopts boron phosphate catalyst, and the reaction temperature is 300 ~ 350 ℃. It will decompose when it is chemical, so the selectivity is only 80%. With transient gasification and fluidized bed reactors, selectivity can be increased to 90%.
The liquid phase method is to aminate the molten adipic acid at 200-300 °C in the presence of a catalyst (such as phosphoric acid). Pure adiponitrile can be obtained by dehydration, weight removal, chemical treatment and vacuum distillation of the reaction product. Because this process route uses another main raw material adipic acid for producing nylon 66 salt, the process route is long, the cost is high, and it is not an ideal process route, but compared with the acrylonitrile method, it is still an important production process.
Butadiene method (BD) is divided into butadiene chlorination cyanation method and butadiene direct cyanation method. The butadiene chlorination cyanide method was first developed by DuPont in the early 1960s. The process is complicated, corroded seriously, and the investment is large. It has been eliminated. In the early 1970s, DuPont developed a method for direct cyanation of butadiene without chlorine. The 1,3-butadiene and hydrocyanic acid were reacted in the liquid phase at 100 °C in the presence of a catalyst to generate pentene nitrile. Isomer mixture; after separation and isomerization of isomers into linear pentene nitrile, it is then added with hydrocyanic acid to form adiponitrile, which reduces the cost of raw materials by 15% and saves energy by 45% compared with the chlorination method.
This method has two sets of production units in the United States, and in 1974, in the Chalampa region of France, a joint venture with the Rhone Planck Company built the Butachemic Co. Ltd. A set of production units that are currently in the best operating condition in the world. The process route has cheap and easy-to-obtain raw materials, short route, no pollution, low energy consumption and low cost, and is currently the most advanced, ideal and important production process route.
ToggaToray Company of Japan used waste caprolactam as raw material to develop a process route of degrading caprolactam and then hydrolyzing it to produce adiponitrile. It focuses on the recycling of waste raw materials, which is a good development idea, and the production cost has also been reduced. The key is that the lack of raw materials cannot be produced on a large scale.le Content
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