What are the upstream raw materials of AS? What are the downstream products?

In the field of chemical production raw materials, AS(Acrylonitrile-Styrene Copolymer, acrylonitrile-styrene copolymer) is a common plastic material. But I've found that The upstream and downstream associated items of AS mainly include the following categories:



1. Upstream raw materials(1) Acrylonitrile: Acrylonitrile is one of the main raw materials of AS, which is prepared by the interaction of propylene, ammonia and oxygen. The production methodology and equipment of acrylonitrile are very similar to the production of vinyl chloride by ethylene oxychlorination, except that the yield of acrylonitrile is reduced than that of vinyl chloride. For instance In addition, the manufacturing process of acrylonitrile will consumption the highly toxic chemical hydrogen cyanide, security production and ecological preservation standards are stringent. At present, the production methodology of acrylonitrile in the world is mainly controlled by several substantial companies. In my experience, In particular(2) Styrene: Styrene is another major raw material to AS and is produced by catalytic dehydrogenation of ethylbenzene. Industrially, styrene is mainly produced by ethylbenzene dehydrogenation.

2. For example Downstream items(1)AS plastic: AS plastic is a transparent and yellow to amber solid, with good thermoplasticity, not easy to change color, not affected by dilute acid, dilute alkali, dilute alcohol and gasoline. However, it's dissolves in acetone, ethyl acetate, dichloroethylene, etc. Excellent heat resistance and solvent-based products resistance. The items made by AS have the characteristics of high transparency, good gloss, bright colors, hard condition, and not easy to break. Moreover(2)SAN plastic: SAN, also known as AS-A or ASA, is a polymer compound made of acrylonitrile and styrene. it's a clear and transparent thermoplastic resin with high temperature resistance, excellent gloss and chemical resistance, as well as excellent hardness, rigidity, dimensional stability and high carrying capacity. SAN is broadly applied in the production of oil-resistant, heat-resistant, chemical-resistant manufacturing items, as well as instrument panels, instrument frames, enclosures, battery boxes, junction boxes, a variety of switches and according to regulations. In general, the upstream and downstream related items of AS cover a number of chemical and material fields, which are of great signifiis able toce to chemical production and consumption.