xov xwm

Tsawg ntom polyethylene (LDPE)yog polymerized ethylene li polymerization monomer, peroxide ua tus pib, cov thermoplastic resin tau los ntawm cov tshuaj tiv thaiv dawb radical polymerization, qhov hnyav molecular feem ntau nyob rau hauv 100000 ~ 500000, qhov ceev yog 0.91 ~ 0.93g / cm3, yog lub lightest ntau yam ntawm polyethylene cob. .

Nws muaj softness zoo, extensibility, hluav taws xob rwb thaiv tsev, transparency, yooj yim ua thiab tej huab cua permeability.Zoo tshuaj stability, alkali tsis kam, tsis kam mus rau cov organic solvents, muaj ntau yam kev siv, xws li extrusion txheej, tshuab zaj duab xis, hlau thiab cable txheej, txhaj molding thiab tshuab molding hollow molding, thiab lwm yam.

Vim lub neej luv luv ntawm cov dawb radicals uas tsim los ntawm tus pib, ethylene yog compressed heev los ntawm kev ua kom cov tshuaj tiv thaiv siab (110 ~ 350MPa), kom nws qhov ceev yog nce mus rau 0.5g / cm3, uas zoo ib yam li cov kua uas tsis tuaj yeem. yuav compressed dua.Txhawm rau ua kom luv luv ntawm ethylene molecular spacing thiab ua rau muaj kev sib tsoo ntawm cov dawb radicals lossis cov saw hlau loj hlob thiab cov ethylene molecules, cov tshuaj tiv thaiv dawb radical polymerization yog nqa tawm.Tsawg ntom polyethylene yog tsim, yog li tsis tshua muaj ntom polyethylene kuj hu ua high pressure low density polyethylene.

Tsawg ntom ntom polyethylene txheej txheem

Cov txheej txheem tsim khoom ntawm cov polyethylene tsawg ntom ntom feem ntau suav nrog ethylene ob-theem compression, pib thiab tswj kev txhaj tshuaj, polymerization cov tshuaj tiv thaiv kab mob, kev sib cais siab thiab tsis tshua muaj siab thiab rov ua haujlwm, extrusion granulation thiab tom qab kev kho mob, thiab lwm yam.

Raws li qhov sib txawv ntawm cov reactor, nws tuaj yeem muab faib ua ob hom: txoj kev siab siab raj thiab txoj kev autoclave.

Cov txheej txheem tubular thiab cov txheej txheem kettle muaj lawv tus kheej cov yam ntxwv: tubular reactor muaj cov qauv yooj yim, yooj yim siv thiab txij nkawm, thiab tuaj yeem tiv taus siab dua;Cov qauv ntawm lub reactor yog qhov nyuaj, thiab kev saib xyuas thiab kev teeb tsa kuj nyuaj.Nyob rau tib lub sijhawm, qhov ntim ntawm lub reactor feem ntau yog me me vim muaj peev xwm tshem tawm cov cua sov tsawg.

Feem ntau hais lus, txoj kev siv lub raj siv rau kev teeb tsa loj, thaum lub tshuab hluav taws xob yog siv rau kev teeb tsa uas tsim cov khoom muaj nqis ntxiv xws li EVA ntawm qib tshwj xeeb thiab cov ntsiab lus siab ntawm vinyl acetate.

Vim yog cov yam ntxwv ntawm cov txheej txheem sib txawv, cov txheej txheem kettle muaj cov saw hlau ntau dua thiab muaj kev cuam tshuam zoo zog, uas yog tsim rau extruding txheej resin.Cov txheej txheem raj muaj qhov dav ntawm qhov hnyav molecular, tsis tshua muaj cov saw hlau thiab cov khoom siv kho qhov muag zoo, uas yog tsim rau kev ua cov yeeb yaj kiab nyias.

High pressure tube method low density polyethylene production technology

Sab hauv txoj kab uas hla ntawm cov tubular reactor feem ntau yog 25 ~ 82 hli, qhov ntev yog 0.5 ~ 1.5km, qhov sib piv yog ntau dua 10000: 1, sab hauv txoj kab uas hla mus rau sab hauv txoj kab uas hla feem ntau tsis tsawg dua 2 hli, thiab lub tsho dej yog siv los tshem tawm ib feem ntawm cov tshuaj tiv thaiv tshav kub.

Txog tam sim no, cov yeeb nkab yog kwv yees li tib txoj hauv kev los ua cov txheej txheem hauv paus, kev siv cov khoom sib txawv reactor feed point, sib txawv molecular hnyav regulator, pib thiab nws qhov chaw txhaj tshuaj, thiab ntau txoj hauv kev ntawm kev txhaj tshuaj chiv, cov khoom lag luam, cov nyiaj rov qab. ethylene thiab xa tawm txoj haujlwm, tau tsim cov txheej txheem sib txawv.

Tam sim no, cov txheej txheem tubular paub tab feem ntau suav nrog LyondellBasell's Lupotech T txheej txheem, Exxon Mobil cov txheej txheem tubular thiab DSM's CTR txheej txheem.

Lupotech T process

Cov txheej txheem LyondellBasell Lupotech T yog siv rau kwv yees li 60% ntawm lub peev xwm tsim khoom hauv tsev ntawm cov nroj tsuag polyethylene tsawg.Cov tshuaj tiv thaiv siab 260 ~ 310MPa, cov tshuaj tiv thaiv kub 160 ~ 330 ℃, ib txoj kev hloov pauv ntawm 35%, cov khoom ntom 0.915 ~ 0.935g / cm3, melting Performance index 0.15 ~ 50g / 10min, ib kab ntau lawm muaj peev xwm 45 × 104T / A, tus txheej txheem muaj tsib yam ntxwv technical:

(1) Pulse reactor thev naus laus zis tau txais los ua kom paub lub valve qhib, lub sijhawm qhib lub valve thiab hloov zaus ntawm qhov kawg ntawm lub reactor.Pulse ua haujlwm tuaj yeem txhim kho qhov sib xyaw ua haujlwm hauv reactor, cov tshuaj tiv thaiv zoo, kev hloov pauv siab, txo cov reactor phab ntsa adhesion, txhim kho cov cua sov hloov coefficient, thiab zoo dua cov cua sov tshem tawm ntawm lub tsho dej;

(2) Peroxides tau txhaj rau hauv ntau qhov chaw ntawm lub reactor ntawm plaub lub ntsiab lus los ua plaub ntu ntawm thaj chaw tshuaj tiv thaiv;

(3) Nrog propylene, propanaldehyde li molecular hnyav regulator, qhia los ntawm compressor inlet, nrog ethylene rau hauv reactor, ntau yam khoom;

(4) Lub tshuab hluav taws xob muaj hluav taws xob muaj peev xwm paub txog kev tu tus kheej, dissolving thiab dewaxing ua haujlwm los ntawm kev tswj hwm, txo qhov cuam tshuam ntawm kev ua haujlwm ib txwm muaj;

(5) Teem lub chaw nres tsheb dej kub kom txo tau qhov kev siv dej txias, thiab rov qab cov cua sov ntawm cov tshuaj tiv thaiv polymerization thiab kev kub siab circulating gas system rau lwm yam khoom siv.

Exxon Mobil tubular txheej txheem

Cov tshuaj tiv thaiv siab ntawm Exxon Mobil raj txheej txheem yog 250 ~ 310MPa, cov tshuaj tiv thaiv kub yog 215 ~ 310 ℃, kev hloov pauv tus nqi nce mus txog 40%, cov khoom ntom ntom yog 0.918 ~ 0.934g / cm3, melting Performance index yog 0.2 ~ 50g / (10min), thiab ib kab ntau lawm yog 50 × 104T / A.Cov txheej txheem muaj rau 6 tus yam ntxwv:

(1) Cov kab rov tav laub ntws raj reactor tau txais yuav, thiab txoj kab uas hla ntawm lub reactor yog nthuav tawm cov kauj ruam raws li cov kev taw qhia axial kom optimize cov roj ntws thiab cov reactor siab poob.Ua kom muaj kev ruaj ntseg ntawm cov tshuaj tiv thaiv, txo cov tshuaj tiv thaiv decomposition, txo cov nplai hauv lub reactor, txhim kho cov hluav taws xob hloov hluav taws xob ntawm lub reactor;

(2) Tus thawj coj tau txhaj tshuaj raws li axial kev taw qhia ntawm lub reactor, uas tuaj yeem tsim 4 ~ 6 thaj chaw tshuaj tiv thaiv, txhim kho tus nqi hloov pauv thiab kev ua haujlwm yooj yim, thiab ntau yam khoom siv;

(3) Feem ntau siv propylene ua tus tswj kom tswj tau qhov ntsuas melting, kev tsim cov khoom siv nruab nrab ntawm cov khoom siv propanaldehyde ua tus tswj hwm, tswj los ntawm kev kub siab diaphragm twj tso kua mis txhaj rau compressor inlet ob zaug, thiab tom qab ntawd nrog ethylene rau hauv reactor;

(4) siv cov kub tubular reactor ntawm ethylene vinyl rau pem hauv ntej pub thiab txias multipoint pub mis ua ke ntawm lateral, uniform cua sov tso tawm thiab tej zaum kuj muaj cov nyhuv ntawm tshem tawm cov cua sov ntawm cov tshuaj tiv thaiv, lub reactor optimized jacketed txias load, txo qhov ntev ntawm lub reactor. , thiab ua kom lub reactor kub tis nyob rau hauv ib tug du, txhim kho ethylene conversion tus nqi.Nyob rau tib lub sijhawm, vim muaj ntau lub ntsiab lus pub rau sab nraud, qhov kub ntawm ethylene pub kom muaj nuj nqis ntawm lub reactor yog txo, lub tshav kub load ntawm lub reactor inlet preheater yog txo, thiab kev noj cov kub siab thiab nruab nrab siab chav yuav txo.

(5) Lub kaw lus ntsuas kub tswj dej yog siv los muab dej rau lub tsho reactor kom tshem tawm cov tshuaj tiv thaiv tshav kub.Los ntawm kev ua kom zoo dua cov dej kub ntawm lub tsho dej, qhov kev hloov hluav taws xob hloov tau zoo dua qub, qhov ntev ntawm lub reactor luv luv, thiab qhov hloov pauv tau nce ntxiv;

(6) Kev rov ua dua thiab kev siv lub zog siab thiab cov kua dej kub kub ua kom lub zog tawm ntawm qhov siab ntawm lub siab sib cais.

CTR txheej txheem

DSM CTR txheej txheem cov tshuaj tiv thaiv siab yog 200 ~ 250MPa, cov tshuaj tiv thaiv kub yog 160 ~ 290 ℃, hloov pauv tus nqi yog 28% ~ 33.1%, qhov siab tshaj plaws tuaj yeem ncav cuag 38%, cov khoom ntom yog 0.919 ~ 0.928g / cm3, melting Performance index yog 0.3 ~ 65g / (10min), Qhov siab tshaj plaws ib leeg hlau muaj peev xwm ncav cuag 40 × 104T / A.Cov txheej txheem muaj tsib yam ntxwv kev:

(1) Siv cov kev ua haujlwm tsis yog mem tes, lub reactor kev khiav hauj lwm siab yog tsawg thiab ua kom tas mus li, tus nqi ntws hauv lub reactor siab, nws muaj cov nyhuv scouring zoo, tsis tsim cov phab ntsa sticking tshwm sim, lub reactor tsis xav tau kev tu thiab descaling, thiab txo cov nqi khiav lag luam;

(2) Lub reactor yeeb nkab txoj kab uas hla yog khaws cia tas mus li, txoj cai ncaj qha "ib-dhau" tau txais kev pom zoo, tsis muaj txoj kab kev noj qab haus huv, lub reactor thiab kev txhawb nqa tsim yog yooj yim dua, thiab kev nqis peev qis dua;

(3) lub tsho reactor yog txias los ntawm cov dej txias, uas tuaj yeem tsim cov pa los ntawm cov khoom;

(4) Kev siv cov peroxide pib, cov khoom gel muaj pes tsawg leeg yog me me, tsis muaj catalyst residue, kev tiv thaiv ib puag ncig zoo;Tsawg oligomers tau tsim tawm, thiab cov txheej txheem rov ua dua ntawm cov pa roj tau yooj yim.

(5) Kev ua haujlwm zoo thiab tsis muaj qhov hloov pauv siab thaum lub sijhawm polymerization ua rau cov khoom lag luam zoo, tshwj xeeb tshaj yog cov khoom siv yeeb yaj kiab, nrog cov khoom siv kho qhov muag zoo thiab cov khoom ua haujlwm, tuaj yeem tsim cov yeeb yaj kiab yam tsawg kawg nkaus ntawm 10μm cov khoom siv zaj duab xis, tab sis cov khoom lag luam nqaim, tsis tuaj yeem tsim cov khoom siv copolymer (EVA) nrog qis melt index.

Kev tsim cov thev naus laus zis ntawm polyethylene tsawg ntom ntom los ntawm txoj kev autoclave

Cov txheej txheem autoclave siv lub tank reactor nrog lub tshuab nplawm, qhov sib piv ntawm 2: 1 txog 20: 1, lub tank reactor ntim yog 0.75 ~ 3m3.Cov tshuaj tiv thaiv kub yog feem ntau 150 ~ 300 ℃, cov tshuaj tiv thaiv siab feem ntau yog 130 ~ 200MPa, tus nqi hloov pauv yog 15% ~ 21%.

Txij li thaum lub hwj chim reactor yog ib tug tuab-walled hlab ntsha, lub tshav kub hloov mus los ntawm lub reactor phab ntsa yog txwv ntau tshaj li cov tubular reactor, yog li cov tshuaj tiv thaiv yog ib tug txheej txheem adiabatic, thiab tsis pom tseeb cua sov yog tshem tawm ntawm lub reactor.Cov tshuaj tiv thaiv kub yog tsuas yog tswj los ntawm ntau lub ntsiab lus txhaj tshuaj ethylene txias pub kom sib npaug cov tshuaj tiv thaiv tshav kub.Lub reactor yog nruab nrog lub cev muaj zog tsav stirrer kom cov sib tov nyob rau hauv lub reactor uniform thiab zam lub zos kub chaw.Cov neeg pib yog cov organic peroxide, uas tuaj yeem txhaj rau ntawm qhov chaw sib txawv raws li axial kev taw qhia ntawm lub reactor los tsim ntau yam tshuaj tiv thaiv nrog qhov sib txawv ntawm kev ua haujlwm kub.Tsis muaj backmixing ntawm cov tshuaj tiv thaiv seem, kev ua haujlwm yooj yim thiab cov khoom siv dav, uas tuaj yeem tsim cov copolymerized EVA nrog txog 40% vinyl acetate cov ntsiab lus.

Lupotech A process

Lupotech A txheej txheem siv A stirred tank reactor, lub reactor ntim yog 1.2m3, raw cov ntaub ntawv thiab cov pib raug txhaj rau hauv lub reactor los ntawm ntau lub ntsiab lus, cov tshuaj tiv thaiv siab yog 210 ~ 246MPa, lub siab tshaj plaws tshuaj tiv thaiv kub yog 285 ℃, regulator yog propylene los yog propane, ntxiv los ntawm qhov nruab nrab compressor inlet, tuaj yeem tsim ntau yam LDPE / EVA cov khoom, Cov khoom ntom ntom yog 0.912 ~ 0.951g / cm3, melting Performance index yog 0.2 ~ 800g / (10min), cov ntsiab lus ntawm vinyl acetate tuaj yeem nce. mus rau 40%, qhov kev hloov pauv ib-txoj kev ntawm lub reactor yog 10% ~ 21%, qhov siab tshaj plaws ib kab tsim nplai tuaj yeem ncav cuag 12.5 × 104t / a.

LupotechA txheej txheem tuaj yeem tsis tsuas yog tsim extruded coated resin nrog ntau ceg saw thiab muaj kev cuam tshuam zoo dua, tab sis kuj tsim cov khoom siv zaj duab xis nyias nrog cov khoom hnyav molecular faib.Lub melting Performance index thiab ntom ntawm LDPE / EVA cov khoom tuaj yeem tswj tau zoo los ntawm APC tswj qhov system, thiab cov khoom sib xws tuaj yeem tau txais.Lub ntsiab lus tseem ceeb ntawm cov txheej txheem no yog Sirbon petrochemical, Yangzi petrochemical, Shanghai petrochemical, thiab lwm yam, lub peev xwm ntawm cov cuab yeej yog 10 × 104T / a.

Exxon Mobil kettle txheej txheem

Cov txheej txheem Exxon Mobil tank siv tus kheej tsim 1.5m3 multi-zone tank reactor.Lub reactor muaj qhov sib piv loj dua, lub sijhawm khaws cia ntev dua, kev pib ua haujlwm tau zoo dua qub thiab nqaim cov khoom lag luam molecular hnyav, uas yog qhov tsim nyog rau kev tsim cov khoom siv zaj duab xis nyias uas zoo sib xws rau cov txheej txheem raj.

Lub regulator yog txawv ntawm Exxon Mobil raj txoj kev.Isobutene los yog n-butane yog siv, uas yog boosted rau 25 ~ 30MPa los ntawm lub high-pressure diaphragm twj tso kua mis, txhaj ob zaug ntawm lub compressor inlet, thiab nkag mus rau lub reactor nrog ethylene.

Lub reactor siab ntau yog dav, thiab qhov siab tshaj plaws cov tshuaj tiv thaiv yog 200MPa, uas tuaj yeem tsim LDPE homopolymer nrog qis melt Performance index thiab EVA copolymer nrog siab vinyl acetate cov ntsiab lus.

Cov txheej txheem Exxon Mobil tuaj yeem tsim cov khoom LDPE homopolymer nrog melting Performance index ntawm 0.2 ~ 150g / (10min) thiab ceev ntawm 0.910 ~ 0.935g / cm3.Melt Performance index 0.2 ~ 450g / (10min) vinyl acetate cov ntsiab lus txog 35% ethylene - vinyl acetate copolymer (EVA) khoom.Lub ntsiab lus tseem ceeb ntawm cov txheej txheem no yog Lianhong Group (yav tas los Shandong Hauda), cov cuab yeej muaj peev xwm yog 10 × 104T / a, TRINA, cov cuab yeej muaj peev xwm yog 12 × 104T / a, thiab lwm yam.