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Low density polyethylene (LDPE)is polymerized ethylene sepolymerization monomer, peroxide seyekutanga, thermoplastic resin inowanikwa nemahara radical polymerization reaction, huremu hwemamorekuru hunowanzo mu100000 ~ 500000, density i0.91 ~ 0.93g/cm3, ndiyo yakareruka siyana yepolyethylene resin. .

Iine kupfava kwakanaka, kuwedzera, kuvharwa kwemagetsi, kujeka, kugadzirisa nyore uye kumwe kupindira kwemhepo.Kugadzikana kwakanaka kwemakemikari, alkali kuramba, kuramba kune general organic solvents, ine zvakawanda zvekushandisa, zvinosanganisira extrusion coating, blow film, waya uye tambo coating, jekiseni kuumba uye kuvhuvhuta molding hollow molding, nezvimwe.

Nekuda kwehupenyu hupfupi hwemahara radicals anogadzirwa neakatanga, ethylene yakanyanya kudzvanywa nekuwedzera reaction pressure (110 ~ 350MPa), kuitira kuti density yayo iwedzere kusvika 0.5g/cm3, iyo yakafanana nemvura isingakwanise. kumanikidzwa zvakare.Kuti upfupise iyo ethylene molecular spacing uye kuwedzera mukana wekudhumhana pakati pemahara radicals kana anoshingaira kukura maketani uye ethylene mamorekuru, yemahara radical polymerization reaction inoitwa.Yakaderera density polyethylene inogadzirwa, saka yakaderera density polyethylene inonzi zvakare yakakwira yakaderera density polyethylene.

Low density polyethylene kugadzira maitiro

Iyo yekugadzira yakaderera density polyethylene inonyanya kusanganisira ethylene maviri-nhanho compression, initiator uye regulator jekiseni, polymerization reaction system, yakakwirira uye yakaderera kudzvanywa kupatsanurwa uye kudzoreredza system, extrusion granulation uye post-kurapa system, nezvimwe.

Zvinoenderana nerudzi rwakasiyana rwe reactor, inogona kukamurwa kuita marudzi maviri: yakakwira-kumanikidza chubhu nzira uye autoclave nzira.

Iyo tubular process uye kettle process ine hunhu hwayo: iyo tubular reactor ine chimiro chakareruka, yakanakira kugadzira uye kugadzirisa, uye inogona kumirisana nekumanikidza kwakakwira;Chimiro cheiyo reactor chakaoma, uye kugadzirisa uye kuiswa kwakaoma.Panguva imwecheteyo, kuwanda kweiyo reactor kunowanzo kudiki nekuda kwekushomeka kwekubvisa kupisa.

Kazhinji kutaura, nzira yechubhu inoshandiswa pakumisikidza kwakakura, nepo nzira yeketero inoshandiswa pakumisikidza inogadzira yakakwirira-yakawedzerwa zvigadzirwa seEVA yegiredhi yakakosha uye yakakwira yevinyl acetate.

Nekuda kwehunhu hwemaitiro akasiyana, iyo kettle nzira ine mamwe matavi maketani uye nani simba rekuita, iro rakakodzera extruding coating resin.Iyo chubhu nzira ine yakafara molecular uremu kugovera, kushoma branched cheni uye yakanaka optical pfuma, iyo yakakodzera kugadzirwa kuita mafirimu matete.

High pressure tube nzira yakaderera density polyethylene kugadzira tekinoroji

Iyo dhayamita yemukati ye tubular reactor inowanzoita 25 ~ 82mm, kureba i 0.5 ~ 1.5km, chikamu chechiyero chakakura kupfuura 10000: 1, dhayamita yekunze kusvika mukati medhiyamu reshiyo kazhinji haisi pasi pe2mm, uye bhachi remvura inoshandiswa kubvisa chikamu chekupisa kwekuita.

Kusvika pari zvino, pombi ingangoita nzira imwechete yekugadzirisa kuyerera kwekutanga, kutorwa kweyakasiyana reactor feed point, akasiyana molecular weight regulator, initiator nenzvimbo yayo jekiseni, uye nzira dzakasiyana dzejekiseni refetereza, kugadzirisa chigadzirwa, huwandu hwekudzoka ethylene uye inotumira kunze chinzvimbo, yakagadzira akasiyana maficha ekuita.

Parizvino, iyo yakakura tubular process tekinoroji inonyanya kusanganisira LyondellBasell's Lupotech T maitiro, Exxon Mobil's tubular process uye DSM's CTR maitiro.

Lupotech T maitiro

Iyo LyondellBasell Lupotech T process inoshandiswa kune ingangoita 60% yesimba rekugadzira mudzimba reyakaderera density polyethylene zvirimwa.The reaction pressure 260 ~ 310MPa, reaction tembiricha 160 ~ 330 ℃, imwe-nzira kutendeuka mwero we35%, chigadzirwa density 0.915 ~ 0.935g/cm3, kunyunguduka indekisi 0.15 ~ 50g/10min, imwe mutsara kugadzirwa kugona 45× 104T/A, iyo maitiro ane mashanu ehunyanzvi maitiro:

(1) Pulse reactor tekinoroji inogamuchirwa kuti ione kuvhurwa kwevhavha, nguva yekuvhura vharafu uye kushandura frequency kumagumo kweiyo reactor.Kushanda kwePulse kunogona kuvandudza maitiro ekusanganisa mu reactor, kugadzikana kwakanaka kwekuita, kushanduka kwakanyanya, kuderedza reactor madziro adhesion, kunatsiridza kupisa kwekutamisa coefficient, uye nani kupisa kubviswa kwemvura yejacket;

(2) Peroxides akaiswa munzvimbo dzakasiyana dze reactor pamapoinzi mana kuti aite zvikamu zvina zvenzvimbo yekupindura;

(3) Iine propylene, propanaldehyde semolecular weight regulator, yakaunzwa necompressor inlet, ine ethylene mu reactor, yakafara chigadzirwa renji;

(4) Iyo yakanyanya-kudzvanywa inotenderera gasi system inogona kuona yekuzvichenesa, kunyungudika uye dewaxing mashandiro kuburikidza nesequential control, kuderedza kukanganiswa kwezvakajairwa kugadzirwa mashandiro;

(5) Misa chiteshi chemvura inopisa kudzikisa kushandiswa kwemvura inotonhorera, uye kudzoreredza kupisa kwepolymerization reaction uye yakanyanya-kudzvanya kutenderera gasi system kune mamwe maturusi.

Exxon Mobil tubular process

The reaction pressure yeExxon Mobil tube process is 250 ~ 310MPa, the reaction tembiricha i215 ~ 310 ℃, shanduko inokwira kusvika 40%, density yechigadzirwa i0.918 ~ 0.934g/cm3, iyo melting index i0.2 ~ 50g/ (10min), uye mutsara mumwe chete wekugadzira simba ndeye 50×104T/A.Iyo maitiro ane matanhatu ehunyanzvi maitiro:

(1) Iyo yakatwasuka push inoyerera chubhu reactor inogamuchirwa, uye dhayamita reiyo reactor inowedzerwa nhanho nhanho pamwe neaxial kutungamira kuti ukwidzise kuyerera kwegasi uye kudonha kwesimba rereactor.Wedzera kugadzikana kwemaitiro, kuderedza kuparara kwekuita, kuderedza chiyero mukati me reactor, kunatsiridza kupisa kwekushisa kweiyo reactor;

(2) Iyo initiator inoiswa jekiseni pamwe neaxial kutungamira kweiyo reactor, iyo inogona kuumba 4 ~ 6 maitiro ekuita, kuvandudza chiyero chekushandura uye kushanduka kwekushanda, uye yakafara chigadzirwa mhando;

(3) Kazhinji shandisa propylene semugadziri kudzora indekisi yekunyunguduka, kugadzirwa kwepakati-density zvigadzirwa uchishandisa propanaldehyde semugadziri, regulator kuburikidza ne high pressure diaphragm pombi jekiseni kune compressor inlet kaviri, uye ipapo ne ethylene mu reactor;

(4) uchishandisa inopisa tubular reactor ye ethylene vinyl yekumberi feed uye inotonhora multipoint yekudyisa musanganiswa we lateral, yunifomu kupisa kuburitswa uye inogona zvakare kuve nemhedzisiro yekubvisa kupisa kwekuita, reactor yakagadziridza jaketi kutonhora mutoro, kuderedza kureba kweiyo reactor. , uye ita kugovera tembiricha ye reactor mune yakatsetseka, kunatsiridza ethylene shanduko rate.Panguva imwecheteyo, nekuda kwe-multi-point lateral feed, iyo yepamberi inopisa ethylene feed yehuwandu hweiyo reactor inoderedzwa, kupisa kwemoto kweiyo reactor inlet preheater kunoderedzwa, uye kushandiswa kwekumanikidza kwakanyanya uye yepakati pressure steam inoderedzwa.

(5) Iyo yakavharwa tembiricha inodzora mvura system inoshandiswa kupa mvura kune reactor jekete kuti ibvise kupisa kwekuita.Nokugadzirisa kutonhora kwemvura yejasi rejasi, kupisa kwekushisa kunovandudzwa, kureba kwereactor kunopfupiswa, uye chiyero chekushandura chinowedzera;

(6) Kudzoreredza uye kushandiswa kwekumanikidza kwakanyanya uye kupisa kwakanyanya kwemvura simba rinoburitswa kubva pamusoro peiyo yakakwira yekuparadzanisa.

CTR maitiro

DSM CTR process reaction pressure ndeye 200 ~ 250MPa, reaction tembiricha i160 ~ 290 ℃, shanduko i28% ~ 33.1%, iyo yepamusoro inogona kusvika 38%, chigadzirwa density i0.919 ~ 0.928g/cm3, melting index i0.3 ~ 65g / (10min), Iyo yakanyanya simba imwechete waya inogona kusvika 40 × 104T/A.Iyo maitiro ane mashanu ehunyanzvi maitiro:

(1) Ichishandisa isiri-pulse operation, iyo reactor inoshanda kumanikidza yakaderera uye inoramba ichigara, kuyerera kweiyo reactor yakakwira, ine yakanaka scouring mhedzisiro, haiburitse madziro inonamira chiitiko, reactor haidi kucheneswa uye kudzika, uye inoderedza mutengo wekushanda;

(2) Iyo reactor pombi dhayamita inochengetwa isingachinji, iyo yakananga "imwe-pass" musimboti inogamuchirwa, hapana yakaoma side line yekudyisa system, reactor uye dhizaini yekutsigira iri nyore, uye mari yakaderera;

(3) jekete rereactor rinotonhodzwa nemvura inotonhora, iyo inogona kubudisa utsi nechigadzirwa;

(4) Kushandiswa kweperoxide initiator, chigadzirwa gel kuumbwa idiki, hapana catalyst yakasara, kuchengetedzwa kwezvakatipoteredza kwakanaka;Mashoma maoligomers akagadzirwa, uye nzira yekudzokorodza yekutenderera gasi yakarerutswa.

(5) Mamiriro ekushanda akanaka uye pasina kudzvinyirirwa kwekuchinja panguva yepolymerization inoita kuti zvigadzirwa zvemhando yepamusoro, kunyanya zvigadzirwa zvemufirimu, zvine hunyanzvi hwekuona zvinhu uye zvigadziriso zvekugadzirisa, zvinogona kuburitsa hushoma hwefirimu rezvigadzirwa zvemafirimu e10μm, asi huwandu hwechigadzirwa hwakatetepa, haigone kugadzira zvigadzirwa zvecopolymer (EVA) zvine yakaderera melt index.

Kugadzira tekinoroji yeyakaderera density polyethylene ne autoclave nzira

Iyo autoclave process inoshandisa tank reactor ine inosimudzira sisitimu, chiyero chechikamu chinogona kubva pa2: 1 kusvika 20: 1, iyo tank reactor volume 0.75 ~ 3m3.The reaction tembiricha inowanzova 150 ~ 300 ℃, maitiro ekumanikidza anowanzo 130 ~ 200MPa, chiyero chekushandura i15% ~ 21%.

Sezvo kettle reactor iri mudziyo wakakomberedzwa nemadziro, kupisa kwekushisa kuburikidza nemadziro ereactor kunodzivirirwa kupfuura iyo tubular reactor, saka mhinduro yacho ndeye adiabatic process, uye hapana kupisa kuri pachena kunobviswa kubva kune reactor.Iyo tembiricha yekupindura inonyanya kudzorwa neakawanda-point jekiseni yeinotonhora ethylene feed kudzikamisa maitiro ekupisa.Iyo reactor yakashongedzerwa ine mota inotyairwa stirrer kugadzira musanganiswa mu reactor yunifomu uye kudzivirira munzvimbo inopisa nzvimbo.Iyo initiator ndeye organic peroxide, inogona kubaiwa munzvimbo dzakasiyana pamwe neaxial kutungamira kwe reactor kuti igadzire akawanda reaction zvikamu zvine tembiricha dzakasiyana dzekushanda.Iko hakuna backmixing pakati pekuita zvikamu, flexible mashandiro uye yakafara chigadzirwa renji, iyo inogona kuburitsa copolymerized EVA inosvika makumi mana% vinyl acetate yemukati.

Lupotech A maitiro

Lupotech A process inoshandisa Iyo yakamutswa tank reactor, iyo reactor vhoriyamu i1.2m3, mbishi zvinhu uye initiator inopinzwa mu reactor nemapoinzi akawanda, iyo reaction pressure ndeye 210 ~ 246MPa, yakanyanya kuita tembiricha i285 ℃, regulator ipropylene kana propane, yakawedzerwa neyechipiri compressor inlet, inogona kuburitsa Yakasiyana-siyana yeLDPE / EVA zvigadzirwa, Iyo density yechigadzirwa ndeye 0.912 ~ 0.951g/cm3, iyo yekunyunguduka indekisi ndeye 0.2 ~ 800g/ (10min), zvirimo zvevinyl acetate zvinogona kukwira. kusvika ku40%, imwe-nzira yekutendeuka chiyero cheiyo reactor ndeye 10% ~ 21%, iyo yepamusoro imwechete mutsara dhizaini chiyero inogona kusvika 12.5×104t/a.

LupotechA process haingogone chete kuburitsa extruded coated resin ine mamwe matavi cheni uye zvirinani kuita, asi zvakare kugadzira matete emafirimu zvigadzirwa zvine yakafara molecular uremu kugovera.Iyo yekunyungudika indekisi uye density yeLDPE / EVA zvigadzirwa zvinogona kudzorwa zvakanaka neAPC control system, uye zvigadzirwa zveyunifomu zvinogona kuwanikwa.Iyo huru yekusuma mudzimba yeiyi maitiro iSirbon petrochemical, Yangzi petrochemical, Shanghai petrochemical, nezvimwewo, iyo mudziyo kugona ndeye 10 × 104T / a.

Exxon Mobil kettle process

Iyo Exxon Mobil tank process inotora yakazvigadzira yega 1.5m3 multi-zone tank reactor.Iyo reactor ine hombe chikamu cheyero, nguva yekuchengetedza yakareba, kushanda kwekutanga kwepamusoro uye kushomeka kwechigadzirwa molecular uremu kugovera, izvo zvinobatsira mukugadzirwa kwezvakatetepa zvigadzirwa zvemufirimu zvine mhando yakafanana nechubhu process.

Iyo regulator yakasiyana neExxon Mobil chubhu nzira.Isobutene kana n-butane inoshandiswa, iyo inokwidziridzwa kusvika ku25 ~ 30MPa kuburikidza nepamusoro-pressure diaphragm pump, injected kaviri pa compressor inlet, uye inopinda reactor ne ethylene.

Iyo reactor pressure range yakakura, uye iyo yakanyanya reaction pressure ndeye 200MPa, inogona kuburitsa LDPE homopolymer ine yakaderera melt index uye EVA copolymer ine yakakwira vinyl acetate yemukati.

Iyo Exxon Mobil tank process inogona kugadzira LDPE homopolymer zvigadzirwa zvine melting index ye0.2 ~ 150g/ (10min) uye density ye0.910 ~ 0.935g/cm3.Melt index 0.2 ~ 450g/ (10min) vinyl acetate content kusvika 35% ethylene - vinyl acetate copolymer (EVA) zvigadzirwa.Iyo huru yekusuma mudzimba yeichi chiitiko Lianhong Boka (yaimbova Shandong Hauda), iyo mudziyo chiyero ndeye 10 × 104T / a, TRINA, iyo mudziyo chiyero ndeye 12 × 104T / a, nezvimwe.