Cov khoom siv raw rau lub hnab ntim khoom yog polypropylene, thiab cov khoom siv raw rau kev tsim cov polypropylene yog cov roj av, roj av, thiab thee. Coal yog thawj zaug siv los ua cov pa roj, thiab cov roj av yog thawj zaug siv los ua kom cov roj los ntawm cov naphtha. Tom qab ntawd cov roj tawg los ntawm cov pa roj carbon monoxide, thee gas thiab naphtha raug cais tawm. Cov methane sib cais (C1) tuaj yeem siv los ua roj, ethylene (C2) tuaj yeem siv los tsim polyethylene thiab lwm yam khoom, thiab propylene (C3) tuaj yeem siv los tsim polypropylene thiab lwm yam khoom, butadiene Ethylene (C2), thiab lwm yam. siv los tsim cov roj hmab, thiab lwm yam. Muaj lwm cov pa roj (Cs ~ Cg) rau lwm yam kev siv.
Nrog propylene (tseem hu ua propylene monomer) thiab tom qab ntawd polymerized rau hauv polypropylene. Thaum polypropylene yog polymerized, Ziegler-Natta (Ziegler-Natta) catalyst yog siv los npaj crystalline isotactic polypropylene nrog cov qauv tsis tu ncua. Raws li hom polymerization, nws tuaj yeem muab faib ua plaub pawg, piv txwv li, txoj kev daws teeb meem, cov txheej txheem hnyav, cov txheej txheem ntau thiab cov txheej txheem roj. Cov txheej txheem tseem ceeb tshaj plaws ntawm cov khoom siv polypropylene muaj cov txheej txheem hauv qab no: polymerization, kev sib cais thiab monomer rov qab, deashing, tshem tawm cov khoom random, ziab, granulation, thiab lwm yam, uas yog hu ua thawj tiam txheej txheem. Cov txheej txheem thib ob tshem tawm cov hmoov tshauv tshem tawm, thiab cov txheej txheem thib peb txo cov hmoov tshauv tshem tawm thiab cov txheej txheem tshem tawm random.
