The raw material for ton bags is polypropylene, and the raw materials for the production of polypropylene are natural gas, petroleum, and coal. Coal is first used to make gas, and petroleum is first used to refine oil to extract naphtha. Then the cracked gas from natural gas, coal gas and naphtha is separated. The separated methane (C1) can be used as fuel, ethylene (C2) can be used to produce polyethylene and other products, and propylene (C3) can be used to produce polypropylene and other products, butadiene Ethylene (C2), etc. can be used to produce rubber, etc. There are other gases (Cs~Cg) for other uses.
With propylene (also known as propylene monomer) and then polymerized into polypropylene. When polypropylene is polymerized, Ziegler-Natta (Ziegler-Natta) catalyst is used to prepare crystalline isotactic polypropylene with regular structure. According to the type of polymerization, it can be divided into four categories, namely, the solution method, the solvent method, the bulk method and the gas phase method. The most primitive polypropylene production process has the following processes: polymerization, separation and monomer recovery, deashing, removal of random substances, drying, granulation, etc., which is called the first-generation process. The second generation process eliminates the ash removal process, and the third generation process reduces the ash removal and random removal process.
