He aha te Tukanga Whakangao o te Polyethylene

He aha te Tukanga Whakangao o te Polyethylene

Ko te tukanga whakaputa o te polyethylene ka taea te wehewehe ki:

  • Ko te tikanga pehanga teitei, ka whakamahia te tikanga pehanga teitei hei whakaputa i te polyethylene iti.
  • Te pehanga tohungatanga
  • Tikanga pehanga iti. Pera i te matara te tikanga pēhanga iti he āwangawanga, i reira he tikanga slurry, tikanga otinga me te tikanga wāhanga hau.

Ka whakamahia te tikanga pehanga teitei hei whakaputa i te polyethylene iti. I whakawhanakehia wawe tenei tikanga. Ko te polyethylene i hangaia e tenei tikanga e pa ana ki te 2/3 o te katoa o te whakaputanga o te polyethylene, engari na te whanaketanga o te hangarau whakangao me nga whakakorikori, ko te tere o te tipu i muri i te tikanga pehanga iti.

Pera i te matara te tikanga pēhanga iti he āwangawanga, i reira he tikanga slurry, tikanga otinga me te tikanga wāhanga hau. Ko te tikanga slurry te nuinga e whakamahia ana ki te whakaputa i te polyethylene kiato teitei, ko te tikanga otinga me te tikanga wahanga hau e kore e taea anake te whakaputa i te polyethylene kiato teitei, engari ka whakaputa ano hoki i te polyethylene reo me te iti kiato ma te taapiri i nga comonomers, e mohiotia ana ano ko te polyethylene kiato iti. vinyl. Kei te tere haere nga momo tukanga pehanga iti.

Tikanga Teitei

He tikanga mo te polymerizing ethylene ki roto i te polyethylene iti-kiato ma te whakamahi i te hāora, te peroxide ranei hei kaikokiri. Ka uru te Ethylene ki roto i te reactor i muri i te paheketanga tuarua, ka polymerized ki te polyethylene i raro i te pehanga o te 100-300 MPa, te pāmahana o te 200-300 °C me te mahi a te kaitahuri. Ko te polyethylene i roto i te ahua o te kirihou ka pehia me te pelletized i muri i te taapiri i nga taapiri kirihou.

Ko nga reactors polymerization e whakamahia ana he reactors tubular (me te roa o te ngongo ki te 2000 m) me nga reactors tank. Ko te tere whakawhiti kotahi-paahi o te tukanga tubular ko te 20% ki te 34%, a ko te kaha whakaputa a-tau o te raina kotahi ko te 100 kt. Ko te reiti whakawhiti kotahi-paahi o te tukanga tikanga kettle ko te 20% ki te 25%, a ko te 180 kt te kaha o te whakaputa i te raina kotahi.

Tikanga Peetanga Iti

Ko tetahi atu tukanga whakaputa o te polyethylene, e toru nga momo: te tikanga slurry, te tikanga otinga me te tikanga wahanga hau. Haunga te tikanga otinga, kei raro te pehanga polymerization i te 2 MPa. Te iraral Ko nga waahanga ko te whakarite whakakōkī, te polymerization ethylene, te wehenga polymer me te granulation.

①Te tikanga parapara:

Ko te polyethylene i puta he koretake i roto i te whakarewa me te ahua o te slurry. He ngawari, he ngawari hoki te whakahaere i nga tikanga polymerization. He maha nga wa e whakamahia ana te konumohe Alkyl hei kaiwhakaoho, ka whakamahia te hauwai hei kaiwhakahaere taumaha ngota, ka whakamahia he reactor tank. Ko te slurry polymer mai i te tank polymerization ka tukuna i roto i te tank flash, te whakawehe hau-wai ki te whakamaroke paura, katahi ka parapara. Kei roto hoki i te tukanga whakaputa nga mahi penei i te whakaora whakarewa me te para whakarewa. Ka taea te whakakotahi i nga kettle polymerization rereke i roto i te raupapa, i te pa raneiralkia whiwhi hua he rereke nga tohanga taumaha ngota.

②Te tikanga otinga:

Ka mahia te polymerization i roto i te whakarewa, engari ka memeha nga ethylene me te polyethylene i roto i te whakarewa, a ko te punaha tauhohenga he otinga rite. He tiketike te pāmahana tauhohenga (≥140 ℃) me te pēhanga (4~5MPa). Ko te ahuatanga o te wa poto o te polymerization, te kaha o te whakaputa, ka taea te whakaputa i te polyethylene me te teitei, te reo me te iti, ka pai ake te whakahaere i nga ahuatanga o te hua; heoi, ko te waerau i whiwhi i te tikanga otinga he iti te taumaha ngota, he whaiti te tohatoha ira rapoi, me nga mea totoka. He iti te ihirangi.

③Te tikanga wahanga hau:

Ka polymerized te Ethylene i roto i te ahua hau, iraralMa te whakamahi i te reactor moenga wai. E rua nga momo whakakorikori: raupapa chromium me te raupapa titanium, ka taapirihia ki roto i te moenga mai i te tank rokiroki, ka whakamahia te tohanga ethylene tere-tere ki te pupuri i te rerenga o te moenga me te whakakore i te wera o te polymerization. Ko te polyethylene ka puta ka tukuna mai i raro o te reactor. Ko te pehanga o te reactor he 2 MPa, he 85-100 °C te pāmahana.

Ko te tikanga hau-waahi te tikanga tino nui mo te hanga o te polyethylene iti-kiato raina. Ko te tikanga hau-waahanga ka whakakore i te tukanga o te whakaora whakarewa me te whakamaroke polymer, me te whakaora i te 15% o te haumi me te 10% o te utu whakahaere i whakaritea ki te tikanga otinga. Ko te 30% o te haumi o te tikanga pehanga teitei tuku iho me te 1/6 o te utu whakahaere. Na kua tere te whakawhanake. Heoi, me whakapai ake te tikanga wahanga hau i runga i te kounga o te hua me te momo momo.

Tikanga Pēhanga Waenga

Mā te whakamahi i te whakakōkī chromium e tautokohia ana i runga i te kirikiri kirika, i roto i te reactor koropiko, ka polymerized te ethylene i raro i te pehanga reo ki te whakaputa i te polyethylene teitei.

He aha te Tukanga Whakangao o te Polyethylene

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