Kedu ihe bụ usoro mmepụta nke polyethylene

Kedu ihe bụ usoro mmepụta nke polyethylene

Enwere ike kewaa usoro mmepụta nke polyethylene n'ime:

  • Usoro nrụgide dị elu, a na-eji usoro nrụgide dị elu na-emepụta polyethylene dị ala.
  • Ọkara nrụgide
  • Usoro nrụgide dị ala. N'ihe gbasara usoro nrụgide dị ala, e nwere usoro slurry, usoro ngwọta na usoro gas.

A na-eji usoro nrụgide dị elu na-emepụta polyethylene dị ala. Emepụtara usoro a n'oge. Polyethylene nke usoro a na-emepụta bụ ihe dị ka 2/3 nke mkpokọta polyethylene, ma site na mmepe nke teknụzụ mmepụta na ihe ndị na-eme ka ọ dị elu, ọganihu ya dị ntakịrị n'azụ usoro nrụgide dị ala.

N'ihe gbasara usoro nrụgide dị ala, e nwere usoro slurry, usoro ngwọta na usoro gas. A na-eji usoro slurry eme ihe iji mepụta polyethylene dị elu, ebe usoro ngwọta na usoro gas na-eme ka ọ bụghị nanị na-emepụta polyethylene dị elu, ma na-emepụta ihe dị elu na polyethylene dị ala site n'ịgbakwunye comonomers, nke a makwaara dị ka linear low density polyethylene. vinyl. Usoro dị iche iche dị ala na-etolite ngwa ngwa.

Ụzọ nrụgide dị elu

Usoro nke polymerizing ethylene n'ime obere njupụta polyethylene iji oxygen ma ọ bụ peroxide dị ka onye mmalite. Ethylene na-abanye n'ime reactor mgbe mkpakọ nke abụọ gasịrị, a na-eme ya na polyethylene n'okpuru nrụgide nke 100-300 MPa, okpomọkụ nke 200-300 Celsius C na ọrụ nke onye mmalite. A na-ewepụ polyethylene n'ụdị plastik na pelletized mgbe agbakwunyere ihe mgbakwunye plastik.

Ndị na-emepụta ihe na-emepụta polymerization eji bụ tubular reactors (nke nwere ogologo tube ruo 2000 m) na ndị na-emepụta tank. Ọnụ ọgụgụ ntụgharị nke otu ngafe nke usoro tubular bụ 20% ruo 34%, na ikike mmepụta kwa afọ nke otu ahịrị bụ 100 kt. Ọnụego ntụgharị otu ngafe nke usoro kettle bụ 20% ruo 25%, na ikike imepụta otu ahịrị kwa afọ bụ 180 kt.

Ụzọ nrụgide dị ala

Nke a bụ usoro mmepụta ọzọ nke polyethylene, ọ nwere ụdị atọ: usoro slurry, usoro ngwọta na usoro gas. Ewezuga usoro ngwọta, nrụgide polymerization dị n'okpuru 2 MPa. Mkpụrụ ndụ ihe nketaral nzọụkwụ gụnyere nkwadebe ihe ike, ethylene polymerization, polymer separation and granulation.

① Usoro mgbakasị ahụ:

Ihe na-esi na polyethylene pụta bụ ihe na-adịghị edozi na ihe mgbaze ma dị n'ụdị slurry. Ọnọdụ polymerization slurry dị nro ma dị mfe iji rụọ ọrụ. A na-ejikarị alkyl aluminum eme ihe dị ka onye na-arụ ọrụ, na hydrogen ka a na-eji dị ka ihe na-achịkwa ibu arọ, a na-ejikarị reactor tank eme ihe. A na-agafe slurry polymer site na tankị polymerization site na tankị ọkụ, ihe nkesa mmiri na-ekpo ọkụ na onye na-ehicha ntụ ntụ, na mgbe ahụ granulated. Usoro mmepụta gụnyekwara usoro dịka mgbake mgbaze na nchacha ihe mgbaze. Enwere ike ijikọta kettle polymerization dị iche iche n'usoro ma ọ bụ na parallel iji nweta ngwaahịa nwere nkesa arọ molekụla dị iche iche.

② Usoro ngwọta:

A na-eme polymerization na ihe mgbaze, ma ethylene na polyethylene na-agbaze n'ime ihe mgbaze, na usoro mmeghachi omume bụ ihe ngwọta dị n'otu. Okpomọkụ mmeghachi omume (≥140 ℃) na nrụgide (4 ~ 5MPa) dị elu. A na-eji oge polymerization dị mkpụmkpụ, mmepụta ihe dị elu, ma nwee ike ịmepụta polyethylene na njupụta dị elu, ọkara na nke dị ala, ma nwee ike ịchịkwa njirimara nke ngwaahịa ahụ; Otú ọ dị, polymer nwetara site na usoro ngwọta nwere obere molecular arọ, warara arọ arọ nkesa, na ihe siri ike. Ọdịnaya dị ala.

③ Usoro nke gas:

Ethylene bụ polymerized na steeti gas, mkpụrụ ndụ ihe nketarally na-eji mmiri mmiri reactor. E nwere ụdị ihe abụọ dị iche iche: usoro chromium na usoro titanium, nke a na-etinye ọnụ n'ime ihe ndina site na tank tank, na mgbasa ozi ethylene na-agba ọsọ na-eji na-eme ka mmiri dị n'àkwà na-ekpochapụ okpomọkụ nke polymerization. A na-ewepụ polyethylene nke si na ala nke reactor pụta. Nrụgide nke reactor bụ ihe dịka 2 MPa, na okpomọkụ bụ 85-100 Celsius.

Usoro gas-phase bụ ụzọ kachasị mkpa maka mmepụta nke polyethylene dị ala dị ala. Usoro nke gas na-ekpochapụ usoro mgbake mgbaze na ihicha polymer, ma chekwaa 15% nke ntinye ego na 10% nke ụgwọ ọrụ ma e jiri ya tụnyere usoro ngwọta. Ọ bụ 30% nke itinye ego nke usoro nrụgide dị elu ọdịnala na 1/6 nke ụgwọ ọrụ. Ya mere ọ tolitere ngwa ngwa. Otú ọ dị, ọ dị mkpa ka a na-emeziwanye usoro nke gas gas n'ihe gbasara àgwà ngwaahịa na ụdị dị iche iche.

Ụzọ nrụgide Ọkara

N'iji ihe na-eme ka chromium na-akwado na silica gel, na reactor loop, ethylene bụ polymerized n'okpuru nrụgide ọkara iji mepụta polyethylene dị elu.

Kedu ihe bụ usoro mmepụta nke polyethylene

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