Nws muaj peb hom: slurry txujci, txoj kev daws teeb meem thiab roj theem kev. Dhau ntawm txoj kev daws teeb meem, qhov siab polymerization tau qis dua 2 MPa. Cov kauj ruam dav dav suav nrog kev npaj catalyst, ethylene polymerization, polymer sib cais thiab granulation.
Poly Cov polyethylene uas ua los ntawm cov qauv slurry yog insoluble hauv cov kuab tshuaj thiab nyob hauv lub xeev qeeb qeeb. Slurry polymerization muaj mob me me thiab yooj yim rau kev khiav lag luam. Alkyl txhuas siv feem ntau yog ua kom muaj zog thiab hydrogen siv ua cov tswj qhov hnyav nyhav. Cov roj reactors feem ntau siv. Lub polymer slurry los ntawm lub thawv polymerization tau dhau los ntawm lub flash tank thiab cov roj-kua separator mus rau lub tshuab ziab khaub ncaws, thiab tom qab ntawd mus rau granulation. Cov txheej txheem ntau lawm kuj suav nrog cov kuab tshuaj rov qab, cov kuab paug ua kom zoo thiab lwm cov kauj ruam. Los ntawm kev coj los ua cov polymer polymer sib txawv hauv cov kab los yog cov khiav ua ke, cov khoom lag luam nrog cov khoom sib txawv molecular yuag tuaj yeem tau txais.
Polyethylene
Cov txheej txheem TheSolution Lub polymerization yog kwv nrog cov kuab tshuaj, tab sis ob qho tib si ethylene thiab polyethylene tau yaj nyob hauv cov kuab tshuaj, thiab cov tshuaj tiv thaiv yog cov homogeneous tov. Cov tshuaj tiv thaiv kub (≥140 ℃) thiab siab (4 ～ 5MPa) kuj siab. Nws yog tsiag ntawv los ntawm luv luv polymerization lub sijhawm thiab siab siv ntau. Nws tuaj yeem tsim polyethylene nrog lub siab, nruab nrab thiab qis qis ntawm tib lub sijhawm, uas tuaj yeem tswj tau zoo dua cov yam ntxwv ntawm cov khoom; tab sis cov polymer uas tau los ntawm cov txheej txheem kev daws teeb meem muaj lub cev tsis tshua muaj molecular phaus, qhov xa me me molecular phaus nyhav thiab cov khoom khov yog cov ntsiab lus tsawg.
③Gas-theem txujci" Ethylene yog polymerized nyob rau hauv lub xeev gaseous, feem ntau siv tshuaj tiv thaiv kab mob hauv txaj. Muaj ob hom catalysts: chromium series thiab titanium series, uas yog qhov ntau ntxiv rau hauv lub txaj los ntawm lub thawv ntim khoom, thiab high-speed ethylene tau tawg los tswj cov kua hluav taws xob ntawm lub txaj thiab tshem tawm qhov kub ntawm polymerization. Cov tshuaj polyethylene uas tau tawm hauv qab ntawm cov reactor. Lub zog siab ntawm cov reactor yog li 2 MPa thiab qhov ntsuas kub yog 85-100 ° C. Kev lag luam roj theem yog qhov tseem ceeb tshaj plaws rau kev tsim tawm ntawm cov kab hluav taws xob qis qis polyethylene. Cov pa roj theem txheej txheem tshem tawm cov kev daws teeb meem rov ua dua tshiab thiab polymer kom qhuav cov kauj ruam, thiab txuag 15% ntawm kev nqis peev thiab 10% kev khiav hauj lwm piv nrog cov txheej txheem daws. Nws yog 30% ntawm kev nqis peev los ntawm txoj kev cai lub siab ceev thiab 1/6 ntawm tus nqi ua haujlwm. Raws li cov txiaj ntsig, nws tau tsim kho sai heev. Txawm li cas los xij, cov roj theem kev xav tau kev txhim kho ntxiv hauv cov khoom muaj txiaj ntsig zoo thiab ntau yam.