Kodi Njira Yopangira Polyethylene ndi chiyani

Njira yopanga polyethylene ikhoza kugawidwa m'magulu awiri:

• Njira yothamanga kwambiri, njira yothamanga kwambiri imagwiritsidwa ntchito popanga polyethylene yotsika kwambiri.
• Kuthamanga kwapakatikati
• Njira yotsika kwambiri. Ponena za njira yochepetsera mphamvu, pali njira ya slurry, njira yothetsera vutoli ndi njira ya gasi.

Njira yothamanga kwambiri imagwiritsidwa ntchito popanga polyethylene yotsika kwambiri. Njirayi idapangidwa msanga. The polyethylene opangidwa ndi njira imeneyi nkhani pafupifupi 2/3 la okwana linanena bungwe polyethylene, koma ndi chitukuko cha luso kupanga ndi chothandizira, mlingo wake kukula wakhala kwambiri kumbuyo otsika kuthamanga njira.

Ponena za njira yochepetsera mphamvu, pali njira ya slurry, njira yothetsera vutoli ndi njira ya gasi. The slurry njira makamaka ntchito kubala mkulu kachulukidwe polyethylene, pamene njira yothetsera ndi mpweya gawo njira osati kutulutsa mkulu osalimba polyethylene, komanso kupanga sing'anga ndi otsika osalimba polyethylene powonjezera comonomers, amatchedwanso liniya otsika osalimba polyethylene. vinyl. Njira zosiyanasiyana zochepetsera mphamvu zikukula mofulumira.

High Pressure Njira

Njira yopangira ma polymerizing ethylene kukhala polyethylene yotsika kwambiri pogwiritsa ntchito mpweya kapena peroxide ngati woyambitsa. Ethylene amalowa mu riyakitala pambuyo psinjika yachiwiri, ndipo ndi polymerized mu polyethylene pansi pa 100-300 MPa, kutentha kwa 200-300 ° C ndi zochita za initiator. The polyethylene mu mawonekedwe a pulasitiki ndi extruded ndi pelletized pambuyo kuwonjezera zina pulasitiki.

Ma polymerization reactors omwe amagwiritsidwa ntchito ndi ma tubular reactors (okhala ndi chubu kutalika mpaka 2000 m) ndi ma tank reactor. Kutembenuka kwapang'onopang'ono kwa njira ya tubular ndi 20% mpaka 34%, ndipo mphamvu yopanga pachaka ya mzere umodzi ndi 100 kt. Mlingo wa kutembenuka kwa chiphaso chimodzi cha njira ya ketulo ndi 20% mpaka 25%, ndipo mphamvu yopangira mzere umodzi pachaka ndi 180 kt.

Njira Yotsika Yotsika

Iyi ndi njira ina yopanga polyethylene, ili ndi mitundu itatu: njira ya slurry, njira yothetsera ndi njira ya gasi. Kupatula njira yothetsera vutoli, kuthamanga kwa polymerization kuli pansi pa 2 MPa. Jiniral njira monga chothandizira kukonzekera, ethylene polymerization, polima kulekana ndi granulation.

①Njira yosalala:

The chifukwa polyethylene anali insoluble mu zosungunulira ndipo anali mu mawonekedwe a slurry. Slurry polymerization mikhalidwe ndi yofatsa komanso yosavuta kugwiritsa ntchito. Alkyl aluminiyamu nthawi zambiri amagwiritsidwa ntchito ngati activator, ndipo haidrojeni imagwiritsidwa ntchito ngati chowongolera ma molekyulu, ndipo tank reactor imagwiritsidwa ntchito nthawi zambiri. Polima slurry kuchokera mu thanki ya polymerization amadutsa mu thanki yamoto, cholekanitsa chamadzimadzi cha gasi kupita ku chowumitsira ufa, kenako ndi granulated. Ntchito yopanga imaphatikizansopo njira monga zosungunulira zosungunulira ndi kuyengetsa zosungunulira. Ma ketulo osiyanasiyana a polymerization amatha kuphatikizidwa mndandanda kapena parallel kuti apeze mankhwala okhala ndi magawo osiyanasiyana a maselo olemera.

②Njira yothetsera:

The polymerization ikuchitika mu zosungunulira, koma ethylene ndi polyethylene ndi kusungunuka mu zosungunulira, ndi dongosolo anachita ndi homogeneous njira. Kutentha kwamachitidwe (≥140℃) ndi kuthamanga (4～5MPa) ndizokwera. Amadziwika ndi nthawi yaifupi ya polymerization, kupangika kwakukulu, ndipo amatha kupanga polyethylene yokhala ndi kachulukidwe kapamwamba, sing'anga ndi otsika, ndipo amatha kuwongolera bwino zomwe zimapangidwa; komabe, polima yopezedwa ndi njira yothetsera vutoli imakhala ndi kulemera kochepa kwa maselo, kugawa kwapang'onopang'ono kwa maselo, ndi zinthu zolimba. Zomwe zili ndi zochepa.

③Njira ya gasi:

Ethylene ndi polymerized mu mpweya, jinirally ntchito fluidized bedi riyakitala. Pali mitundu iwiri ya catalysts: chromium mndandanda ndi titaniyamu mndandanda, amene quantitatively anawonjezera pa bedi kuchokera thanki yosungirako, ndi mkulu-liwiro ethylene kufalitsidwa ntchito kusunga fluidization pa bedi ndi kuthetsa kutentha kwa polymerization. The chifukwa polyethylene ndi kutulutsidwa kuchokera pansi pa riyakitala. Kuthamanga kwa riyakitala ndi pafupifupi 2 MPa, ndipo kutentha ndi 85-100 ° C.

Njira ya gasi-gawo ndiyo njira yofunika kwambiri yopangira polyethylene yotsika kwambiri. Njira ya gasi imachotsa njira yochotsera zosungunulira ndi kuyanika kwa polima, ndikupulumutsa 15% ya ndalama ndi 10% ya ndalama zogwirira ntchito poyerekeza ndi njira yothetsera. Ndi 30% ya ndalama zomwe zimagwiritsidwa ntchito panjira yanthawi yayitali komanso 1/6 ya chindapusa. Choncho zakula mofulumira. Komabe, njira ya gawo la gasi iyenera kukonzedwanso molingana ndi mtundu wazinthu komanso zosiyanasiyana.

Njira Yopanikizika Yapakatikati

Pogwiritsa ntchito chothandizira chochokera ku chromium chomwe chimathandizidwa ndi silika gel, mu loop reactor, ethylene imapangidwa ndi polymerized pansi pa kupanikizika kwapang'onopang'ono kuti ipange polyethylene yochuluka kwambiri.

Kodi Njira Yopangira Polyethylene ndi chiyani