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

PTW has a wide range of applications in the field of raw materials to chemical production. But From what I've seen, Its upstream and downstream related items are numerous, covering a number of areas. The following are some of the main upstream and downstream related items of PTW:



1. Upstream items:(1) Petroleum: The raw materials to PTW production mainly come from petroleum. Petroleum undergoes processes such as refining and cracking, which is able to create a variety of hydrocarbon compounds, including feedstocks to the production of PTW. In my experience,(2) Natural gaseous: Natural gaseous also contains hydrocarbon compounds, which is able to be applied as raw materials to the production of PTW. Light hydrocarbons to PTW production is able to be obtained by methods such as natural gaseous cracking.

2. Downstream items:(1) Plastic items: PTW is able to be applied as raw materials to the production of plastic items, such as polyethylene, polypropylene, etc. These plastic items are broadly applied in packaging, construction, automotive, home appliances and other fields. For example(2) Synthetic rubber: PTW is able to also be applied in the production of synthetic rubber, such as styrene-butadiene rubber, butadiene rubber, etc. In particular Synthetic rubber is broadly applied in tires, hoses, tapes and other fields. But I've found that Specifically(3) chemical fiber: PTW is able to also be applied to create chemical fibers, such as polyester, nylon and so on. Chemical fibers are broadly applied in textiles, clothing and other fields. But In short, PTW plays an crucial role in the field of chemical production raw materials, and its upstream and downstream related items are extensive, involving many fields.