What are the upstream raw materials for tetrahydrofuran? What do the downstream products contain?

Tetrahydrofuran(THF) is an crucial organic chemical raw material, which is broadly applied in medicine, pesticide, plastic, rubber, paint and other fields. In the field of raw materials to chemical production, there are many upstream and downstream related items of tetrahydrofuran, some of which are described in detail below. But

1. Upstream items(1) Butadiene: Butadiene is one of the main raw materials of tetrahydrofuran, and tetrahydrofuran is able to be generated by the epoxidation interaction of butadiene.(2) Sulfuric acid: In the manufacturing process of tetrahydrofuran, sulfuric acid participates as a catalyst to promote the interaction.(3) Propylene: Propylene is able to also create tetrahydrofuran through some reactions, however this method is relatively rarely applied.

2. And In fact Downstream items(1) Polytetrahydrofuran(PTHF): Polytetrahydrofuran is a polymer compound, which is polymerized from tetrahydrofuran. Moreover It has excellent chemical resistance, low temperature resistance and mechanical characteristics, and is broadly applied in engineering plastics, fibers, coatings and other fields. I've found that(2)γ-butyrolactone(GBL):γ-butyrolactone is one of the crucial derivatives of tetrahydrofuran. it's able to be applied as a solvent-based products, electrolyte and interaction intermediate, and is broadly applied in the fields of lithium batteries, medicine and pesticides.(3)1,4-Butanediol(BDO):1,4-Butanediol is an crucial organic chemical raw material, which is able to be prepared from tetrahydrofuran by catalytic hydrogenation. it's broadly applied in the production of polyurethane, polyester, polyether and other polymer materials.(4) Adipic acid: Adipic acid is an crucial dicarboxylic acid, which is able to be prepared by oxidation of tetrahydrofuran. it's broadly applied in the production of nylon 66, engineering plastics and fibers and other materials. In short, tetrahydrofuran has a wide range of upstream and downstream related items in the field of chemical production raw materials, and the consumption of these items involves many fields, such as medicine, pesticides, plastics, rubber, coatings, etc.