Chii chinonzi Kugadzira Maitiro ePolyethylene
Iyo nzira yekugadzira polyethylene inogona kukamurwa kuita:
- High pressure method, high pressure method inoshandiswa kugadzira yakaderera density polyethylene.
- Kumanikidza kwepakati
- Low pressure method. Nezve nzira yakaderera yekumanikidza ine chekuita, kune slurry nzira, mhinduro nzira uye gasi chikamu nzira.
Iyo yakanyanya kudzvinyirira nzira inoshandiswa kugadzira yakaderera density polyethylene. Iyi nzira yakagadzirwa kare. Iyo polyethylene inogadzirwa nenzira iyi inosvika 2/3 yehuwandu hwekubuda kwepolyethylene, asi nekuvandudza tekinoroji yekugadzira uye zvinokonzeresa, kukura kwayo kwave kuri kuseri kweiyo yakaderera nzira yekumanikidza.
Nezve nzira yakaderera yekumanikidza ine chekuita, kune slurry nzira, mhinduro nzira uye gasi chikamu nzira. Iyo slurry nzira inonyanya kushandiswa kugadzira yakakwira density polyethylene, nepo nzira yekugadzirisa uye gasi chikamu nzira haingogone kuburitsa yakakwira density polyethylene, asi zvakare kugadzira yepakati uye yakaderera density polyethylene nekuwedzera comonomers, inozivikanwawo semutsara yakaderera density polyethylene. vinyl. Nzira dzakasiyana-siyana dzepasi-pasi dziri kukura nokukurumidza.
High Pressure Method
Nzira yekupolymerizing ethylene kuita yakaderera-density polyethylene uchishandisa oxygen kana peroxide sekutanga. Ethylene inopinda mureactor mushure mekumanikidzwa kwechipiri, uye inogadziriswa mu polyethylene pasi pekumanikidzwa kwe100-300 MPa, tembiricha ye200-300 ° C uye chiito chemutangi. Iyo polyethylene muchimiro chepurasitiki inobudiswa uye pelletized mushure mekuwedzera epurasitiki ekuwedzera.
Mapolymerization reactors anoshandiswa matubular reactor (aine chubhu kureba kusvika 2000 m) uye matangi reactor. Iyo imwechete-pass kutendeuka chiyero cheiyo tubular process ndeye 20% kusvika 34%, uye gore rega rekugadzira kugona kwemutsara mumwe chete 100 kt. Iyo imwe-pass yekushandurwa mwero wekettle method process ndeye 20% kusvika 25%, uye iyo imwechete-mutsara wepagore yekugadzira inokwana 180 kt.
Low Pressure Method
Iyi ndiyo imwe nzira yekugadzira ye polyethylene, ine mhando nhatu: slurry nzira, mhinduro nzira uye gasi chikamu nzira. Kunze kweiyo nzira yekugadzirisa, iyo polymerization pressure iri pazasi 2 MPa. Jeniral matanho anosanganisira catalyst kugadzirira, ethylene polymerization, polymer kupatsanurwa uye granulation.
①Slurry nzira:
Iyo yakaguma ye polyethylene yakanga isinganyunguriki mu solvent uye yakanga iri muchimiro che slurry. Slurry polymerization mamiriro akapfava uye ari nyore kushanda. Alkyl aluminium inowanzoshandiswa se activator, uye hydrogen inoshandiswa se molecular weight regulator, uye tank reactor inowanzoshandiswa. Iyo polymer slurry kubva mupolymerization tangi inopfuudzwa kuburikidza nemwenje tangi, iyo gasi-mvura yekuparadzanisa kune inoomesa hupfu, yobva yaiswa granulated. Maitiro ekugadzira anosanganisirawo matanho akadai sekudzoreredza kudzoreredza uye kugadzirisa kukwenenzvera. Akasiyana polymerization kettles anogona kusanganiswa munhevedzano kana mu parallel kuwana zvigadzirwa zvine akasiyana mamolecular uremu kugoverwa.
②Nzira yekugadzirisa:
Iyo polymerization inoitwa mune inonyungudutsa, asi ese ethylene uye polyethylene inonyungudika mune inonyungudutsa, uye iyo reaction system ndeye homogeneous mhinduro. The reaction tembiricha (≥140℃) uye pressure (4～5MPa) zvakakwirira. Iyo inoratidzirwa nepfupi polymerization nguva, yakakwirira kugadzirwa kwakasimba, uye inogona kuburitsa polyethylene ine yakakwirira, yepakati uye yakaderera densities, uye inogona kudzora zvirinani zvimiro zvechigadzirwa; zvisinei, iyo polima inowanikwa nenzira yemhinduro ine yakaderera molecular huremu, nhete yemamorekuru uremu kugovera, uye yakasimba zvinhu. Zviri mukati zvakaderera.
③Gasi chikamu nzira:
Ethylene inopolymerized mune gaseous state, generally uchishandisa mvura yemubhedha reactor. Kune marudzi maviri e-catalysts: chromium series uye titanium series, iyo yakawanda yakawedzerwa mumubhedha kubva mutangi rekuchengetedza, uye inomhanya-mhanya ethylene circulation inoshandiswa kuchengetedza fluidization yemubhedha uye kubvisa kupisa kwepolymerization. Iyo inoguma polyethylene inoburitswa kubva pasi peiyo reactor. Kudzvanywa kweiyo reactor inenge 2 MPa, uye tembiricha i85-100 °C.
Iyo gasi-chikamu nzira ndiyo inonyanya kukosha nzira yekugadzirwa kwemutsara wakaderera-density polyethylene. Iyo gasi-chikamu nzira inobvisa maitiro ekugadzirisa solvent uye kuomeswa kwepolymer, uye inochengetedza 15% yekudyara uye 10% yemutengo wekushandisa uchienzaniswa nemhinduro nzira. Iyo 30% yekudyara kwechinyakare high pressure nzira uye 1/6 yemubhadharo wekushandisa. Saka yakakurumidza kukura. Nekudaro, iyo gasi chikamu nzira inoda kuvandudzwa maererano nemhando yechigadzirwa uye dzakasiyana.
Medium Pressure Method
Uchishandisa chromium-based catalyst inotsigirwa pasilica gel, mune loop reactor, ethylene inogadzirwa nepolymerized pasi pekumanikidzwa kwepakati kuti ibudise yakakwira-density polyethylene.
Chii chinonzi Kugadzira Maitiro ePolyethylene