Yintoni iNkqubo yeMveliso yePolyethylene

Yintoni iNkqubo yeMveliso yePolyethylene

Inkqubo yokuvelisa i-polyethylene inokwahlulwa ibe:

  • Indlela yoxinzelelo oluphezulu, indlela yoxinzelelo oluphezulu isetyenziselwa ukuvelisa i-polyethylene ephantsi.
  • Uxinzelelo oluphakathi
  • Indlela yoxinzelelo oluphantsi. Ngokubhekiselele kwindlela yoxinzelelo oluphantsi, kukho indlela ye-slurry, indlela yesisombululo kunye nendlela yesigaba segesi.

Indlela yoxinzelelo oluphezulu isetyenziselwa ukuvelisa i-polyethylene ephantsi. Le ndlela yaphuhliswa kwangoko. I-polyethylene eveliswa yile ndlela ichaza malunga ne-2/3 yesiphumo esipheleleyo se-polyethylene, kodwa ngophuhliso lobugcisa bokuvelisa kunye ne-catalysts, izinga lokukhula kwayo liye lagqithisa kakhulu emva kwendlela yoxinzelelo oluphantsi.

Ngokubhekiselele kwindlela yoxinzelelo oluphantsi, kukho indlela ye-slurry, indlela yesisombululo kunye nendlela yesigaba segesi. Indlela ye-slurry isetyenziselwa ukuvelisa i-polyethylene ephezulu yoxinaniso, ngelixa indlela yesisombululo kunye nendlela yesigaba segesi ayikwazi ukuvelisa i-polyethylene ephezulu yoxinaniso, kodwa ivelise i-polyethylene yoxinaniso oluphakathi kunye nephantsi ngokudibanisa i-comonomers, eyaziwa ngokuba yi-linear low density polyethylene. ivinyl. Iinkqubo ezahlukeneyo zoxinzelelo oluphantsi zikhula ngokukhawuleza.

Indlela yoxinzelelo oluphezulu

Indlela yokwenza i-ethylene ibe yi-polyethylene ephantsi yoxinaniso usebenzisa i-oxygen okanye i-peroxide njengomqalisi. I-ethylene ingena kwi-reactor emva koxinzelelo lwesibini, kwaye i-polymerized kwi-polyethylene phantsi koxinzelelo lwe-100-300 MPa, ubushushu be-200-300 ° C kunye nesenzo somqalisi. I-polyethylene ngendlela yeplastiki ikhutshwe kwaye ifakwe i-pelletized emva kokongeza izongezo zeplastiki.

Ii-polymerization reactors ezisetyenzisiweyo zi-tubular reactors (ezinobude betyhubhu ukuya kuma-2000 m) kunye ne-tank reactors. Izinga lokuguqulwa kwe-single-pass yenkqubo ye-tubular yi-20% ukuya kwi-34%, kunye nomthamo wonyaka wokuvelisa umgca omnye yi-100 kt. Izinga lokuguqulwa kwe-single-pass yenkqubo yendlela yeketile yi-20% ukuya kwi-25%, kunye nomthamo owodwa wonyaka wemveliso yi-180 kt.

Indlela yoxinzelelo oluphantsi

Le yenye inkqubo yokuvelisa i-polyethylene , ineentlobo ezintathu : indlela ye-slurry, indlela yesisombululo kunye nendlela yesigaba segesi. Ngaphandle kwendlela yesisombululo, uxinzelelo lwe-polymerization lungaphantsi kwe-2 MPa. Ufuzoral amanyathelo abandakanya ukulungiswa kwe-catalyst, i-ethylene polymerization, ukwahlula i-polymer kunye ne-granulation.

①Indlela yodaka:

I-polyethylene efunyenweyo yayinganyibiliki kwi-solvent kwaye yayikwimo ye-slurry. Iimeko ze-polymerization ezinodaka zithambile kwaye kulula ukusebenza. I-alkyl aluminium isoloko isetyenziswa njenge-activator, kwaye i-hydrogen isetyenziswa njenge-molecular weight regulator, kunye ne-tank reactor isoloko isetyenziswa. I-polymer slurry esuka kwitanki ye-polymerization idlula kwi-tank flash, isahluli se-gas-liquid kwi-dryer dryer, kwaye emva koko i-granulated. Inkqubo yokuvelisa ibandakanya amanyathelo afana nokubuyiswa kwe-solvent kunye nokucocwa kwe-solvent. Iiketile ezahlukeneyo zepolymerization zinokudibaniswa kuthotho okanye kwiparallel ukufumana iimveliso ezinobunzima bemolekyuli ezahlukeneyo.

②Indlela yesisombululo:

I-polymerization iqhutyelwa kwi-solvent, kodwa zombini i-ethylene kunye ne-polyethylene zichithwa kwi-solvent, kwaye inkqubo yokusabela iyisisombululo esilinganayo. Ubushushu bokusabela (≥140℃) kunye noxinzelelo (4~5MPa) ziphezulu. Ibonakaliswe ngexesha elifutshane le-polymerization, ukuveliswa kwemveliso ephezulu, kwaye inokuvelisa i-polyethylene ene-high, medium and low densities, kwaye inokulawula ngcono iimpawu zemveliso; nangona kunjalo, i-polymer efunyenwe yindlela yesisombululo inobunzima obuphantsi be-molecular, ukusabalalisa ubunzima be-molecular, kunye nezinto eziqinileyo. Umxholo uphantsi.

③Indlela yesigaba segesi:

I-ethylene i-polymerized kwimeko yegesi, i-generalsebenzisa i-reactor yebhedi emanzi. Kukho iintlobo ezimbini ze-catalysts: i-chromium series kunye ne-titanium series, ezongezwa ngokobungakanani ebhedini ukusuka kwi-tank yokugcina, kunye nokujikeleza kwe-ethylene ngesantya esiphezulu kusetyenziselwa ukugcina i-fluidization yebhedi kunye nokuphelisa ukushisa kwe-polymerization. I-polyethylene ebangelwayo ikhutshwe phantsi kwe-reactor. Uxinzelelo lwe-reactor malunga ne-2 MPa, kwaye iqondo lokushisa yi-85-100 °C.

Indlela ye-gas-phase yindlela ebaluleke kakhulu yokuvelisa i-polyethylene ephantsi yoxinaniso. Indlela ye-gas-phase iphelisa inkqubo yokubuyisela i-solvent kunye nokomisa kwe-polymer, kwaye igcina i-15% yotyalo-mali kunye ne-10% yeendleko zokusebenza xa kuthelekiswa nendlela yesisombululo. I-30% yotyalo-mali lwendlela yesiqhelo yoxinzelelo oluphezulu kunye ne-1/6 yentlawulo yokusebenza. Ngoko iye yakhula ngokukhawuleza. Nangona kunjalo, indlela yesigaba segesi kufuneka iphuculwe ngakumbi ngokwemigangatho yemveliso kunye neentlobo ezahlukeneyo.

Indlela yoxinzelelo oluphakathi

Ukusebenzisa i-chromium-based-catalyst esekelwe kwi-silica gel, kwi-reactor loop, i-ethylene i-polymerized phantsi koxinzelelo oluphakathi ukuvelisa i-polyethylene ephezulu.

Yintoni iNkqubo yeMveliso yePolyethylene

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