litaba

Polyethylene ea boleng bo tlase (LDPE)ke polymerized ethylene e le polymerization monomer, peroxide e le initiator, thermoplastic resin e fumanoeng ke free radical polymerization reaction, boima ba molek'hule ka kakaretso ke 100000 ~ 500000, boima ke 0.91 ~ 0.93g/cm3, ke mefuta e bobebe ka ho fetisisa ea polyethylene resin .

E na le bonolo bo botle, ho atolosoa, ho kenya motlakase, pepeneneng, ho sebetsa habonolo le ho kenella ho itseng ha moea.Botsitso bo botle ba lik'hemik'hale, ho hanyetsa alkali, ho hanyetsa lihlahisoa tse tloaelehileng tsa tlhaho, ho na le mefuta e mengata ea litšebeliso, ho kenyelletsa le ho roala extrusion, filimi e otlang, terata le ho roala ka cable, ho bōptjoa ha ente le ho phunya ho bōptjoa ha sekoti, joalo-joalo.

Ka lebaka la bophelo bo bokhutšoane ba li-radicals tsa mahala tse hlahisoang ke mothehi, ethylene e hatelloa haholo ka ho eketsa khatello ea maikutlo (110 ~ 350MPa), e le hore boima ba eona bo eketsehe ho 0.5g/cm3, e ts'oanang le mokelikeli o ke keng oa khona. ho hatelloa hape.Bakeng sa ho khutsufatsa sebaka sa limolek'hule tsa ethylene le ho eketsa monyetla oa ho thulana pakeng tsa li-radicals tsa mahala kapa liketane tse ntseng li hola ka mafolofolo le limolek'hule tsa ethylene, karabelo ea mahala ea polymerization ea mahala ea etsoa.Polyethylene e tlaase e hlahisoa, kahoo polyethylene e tlaase e boetse e bitsoa polyethylene e phahameng ea khatello e tlaase.

Ts'ebetso ea tlhahiso ea polyethylene e tlase

Ts'ebetso ea tlhahiso ea polyethylene e tlase haholo e kenyelletsa khatello ea mekhahlelo e 'meli ea ethylene, ente ea initiator le regulator, polymerization reaction system, khatello e phahameng le e tlase ea karohano le sistimi ea ho hlaphoheloa, granulation ea extrusion le sistimi ea kamora kalafo, jj.

Ho latela mofuta o fapaneng oa reactor, e ka aroloa ka mefuta e 'meli: mokhoa o phahameng oa khatello le mokhoa oa autoclave.

Ts'ebetso ea li-tubular le ts'ebetso ea kettle li na le litšobotsi tsa tsona: mochine oa tubula o na le sebopeho se bonolo, ho etsoa habonolo le ho hlokomeloa, 'me se ka mamella khatello e phahameng;Sebopeho sa reactor se rarahane, 'me tlhokomelo le ho kenya li batla li le thata.Ka nako e ts'oanang, molumo oa reactor hangata o monyenyane ka lebaka la matla a fokolang a ho tlosa mocheso.

Ka kakaretso, mokhoa oa tube o sebelisoa bakeng sa ho kenya lisebelisoa tse kholo, ha mokhoa oa kettle o sebelisoa bakeng sa lisebelisoa tse hlahisang lihlahisoa tsa boleng bo phahameng tse kang EVA ea sehlopha se khethehileng le litaba tse phahameng tsa vinyl acetate.

Ka lebaka la litšoaneleho tsa lits'ebetso tse fapaneng, mokhoa oa kettle o na le liketane tse nang le makala a mangata le matla a matla a ts'usumetso, a loketseng bakeng sa resin ea ho roala extruding.Mokhoa oa tube o na le kabo e pharalletseng ea boima ba limolek'hule, ketane e fokolang ea makala le thepa e ntle ea optical, e loketseng ho etsoa lifilimi tse tšesaane.

Theknoloji ea tlhahiso ea polyethylene e phahameng ea khatello e phahameng ea khatello e tlase

Bophahamo bo ka hare ba "tubular reactor" ka kakaretso ke 25 ~ 82mm, bolelele ke 0.5 ~ 1.5km, karolo ea karolo e kholo ho feta 10000: 1, bophara ba ka ntle ho bophara ba ka hare ka kakaretso ha bo ka tlase ho 2mm, 'me baki ea metsi se sebedisoang ho tlosa karolo ya mocheso o etsang.

Ho fihlela joale, phala ke hoo e ka bang mokhoa o tšoanang oa ho sebetsana le phallo ea motheo, ho amoheloa ha ntlha e fapaneng ea ho fepa li-reactor, regulator e fapaneng ea boima ba limolek'hule, initiator le sebaka sa eona sa ente, le mekhoa e fapaneng ea ente ea manyolo, ts'ebetso ea lihlahisoa, palo ea ho khutla ha ethylene mme e romela boemo, e thehile likarolo tse fapaneng tsa ts'ebetso.

Hajoale, theknoloji e ntseng e hola ea tubular e kenyelletsa haholo ts'ebetso ea LyondellBasell's Lupotech T, Exxon Mobil's tubular process le DSM's CTR process.

Lupotech T ts'ebetso

Ts'ebetso ea LyondellBasell Lupotech T e sebelisetsoa hoo e ka bang 60% ea matla a tlhahiso ea malapeng a limela tsa polyethylene tse tlaase.The itsoara joang khatello ea 260 ~ 310MPa, karabelo mocheso 160 ~ 330 ℃, tsela e le 'ngoe ho sokoloha sekhahla 35%, segokanyim ts'ebetso e na le litšobotsi tse hlano tsa tekheniki:

(1) Theknoloji ea pulse reactor e amoheloa ho lemoha ho buloa ha valve, nako ea ho bula li-valve le maqhubu a ho fetola qetellong ea mochine.Ts'ebetso ea pulse e ka ntlafatsa phello ea ho kopanya mochining, botsitso bo botle ba karabelo, sekhahla se phahameng sa ho sokoloha, ho fokotsa sekhomaretsi sa lerako, ho ntlafatsa phetisetso ea mocheso, le phello e ntle ea ho tlosa mocheso oa metsi a jekete;

(2) Peroxides e ne e kenngoa libakeng tse sa tšoaneng tsa mochine ka lintlha tse 'nè ho etsa likarolo tse' nè tsa sebaka sa karabelo;

(3) Ka propylene, propanaldehyde e le taolo ea boima ba limolek'hule, e hlahisoang ke "compressor inlet", e nang le ethylene ka har'a reactor, lihlahisoa tse pharaletseng;

(4) Khatello e phahameng ea tsamaiso ea khase e potolohang e ka lemoha ts'ebetso ea ho itlhoekisa, ho qhibiliha le ho senya ka ho laola ka tatellano, ho fokotsa phello ea mesebetsi e tloaelehileng ea tlhahiso;

(5) Theha tsamaiso ea seteishene sa metsi a chesang ho fokotsa tšebeliso ea metsi a pholileng, le ho tsosolosa mocheso oa polymerization le tsamaiso e phahameng ea khatello ea khase bakeng sa lisebelisoa tse ling.

Ts'ebetso ea tubular ea Exxon Mobil

Khatello ea karabelo ea Exxon Mobil tube process ke 250 ~ 310MPa, mocheso oa karabelo ke 215 ~ 310 ℃, sekhahla sa phetoho se fihla ho 40%, letsoalo la sehlahisoa ke 0.918 ~ 0.934g / cm3, index ea melting ke 0.2 ~ 50g / (10min), mme matla a tlhahiso ea mohala o le mong ke 50×104T/A.Ts'ebetso e na le litšobotsi tse tšeletseng tsa tekheniki:

(1) The rapameng push flow tube reactor e amoheloa, 'me bophara ba reactor bo atolosoa mohato ka mohato ho latela tataiso ea axial ho ntlafatsa sekhahla sa phallo ea khase le ho theoha ha khatello ea reactor.Eketsa botsitso ba karabelo, fokotsa karabelo ea ho bola, fokotsa sekala ka har'a reactor, ntlafatsa katleho ea phetisetso ea mocheso ea mochini;

(2) Initiator e kenngoa ka tsela ea axial ea mochine, e ka etsang libaka tsa 4 ~ 6 tsa karabelo, ho ntlafatsa sekhahla sa phetoho le ho sebetsa ha maemo, le mefuta e mengata ea lihlahisoa;

(3) Ka kakaretso sebelisa propylene e le regulator ho laola melting index, tlhahiso ea lihlahisoa tse mahareng segokanyipalo sebelisa propanaldehyde e le regulator, regulator ka khatello e phahameng diaphragm pompo injected ho compressor inlet ka makhetlo a mabeli, 'me joale ka ethylene ka sekontiri;

(4) ho sebelisa mochine o chesang oa tubular oa ethylene vinyl pele fepa le motsoako o batang oa ho fepa oa multipoint oa lateral, ho lokolloa ha mocheso o ts'oanang, 'me ho ka ba le phello ea ho tlosa mocheso oa karabelo, mochine o matlafatsang o pholileng o pholileng, o fokotsa bolelele ba mochine. , 'me u etse hore mocheso oa mocheso oa motlakase o be bonolo, o ntlafatse sekhahla sa phetoho ea ethylene.Ka nako e ts'oanang, ka lebaka la phepelo ea lateral ea lintlha tse ngata, phepelo ea ethylene e chesang e eang pele e fokotsehile, mocheso oa mocheso oa preheater oa "reactor inlet preheater" oa fokotseha, 'me tšebeliso ea khatello e phahameng le mouoane oa khatello e mahareng oa fokotseha.

(5) Mocheso o koetsoeng o laolang tsamaiso ea metsi o sebelisetsoa ho fana ka metsi ho baki ea reactor ho tlosa mocheso o arabelang.Ka ho ntlafatsa mocheso oa phepelo ea metsi a jekete ea metsi, ts'ebetso ea phetisetso ea mocheso e ntlafatsoa, ​​bolelele ba reactor bo khutsufatsoa, ​​​​'me sekhahla sa phetoho sea eketseha;

(6) Ho tsosolosoa le ho sebelisoa ha khatello e phahameng le matla a metsi a mocheso a phahameng a tsoang holimo ho karohano ea khatello e phahameng.

Mokhoa oa CTR

DSM CTR ts'ebetso ea khatello ea maikutlo ke 200 ~ 250MPa, mocheso oa karabelo ke 160 ~ 290 ℃, sekhahla sa phetoho ke 28% ~ 33.1%, boholo bo ka fihla ho 38%, lihlahisoa tsa lihlahisoa ke 0.919 ~ 0.928g / cm3, index ea melting ke 0.3 ~ 65g / (10min), Bophahamo ba terata e le 'ngoe bo ka fihla ho 40 × 104T/A.Ts'ebetso e na le litšobotsi tse hlano tsa tekheniki:

(1) Ha u sebelisa ts'ebetso e se nang pulse, khatello ea ts'ebetso ea "reactor" e tlase 'me e lula e tsitsitse, sekhahla sa phallo se phahameng, se na le phello e ntle ea ho senya, ha e hlahise ketsahalo ea ho khomarela lebota, mochine ha o hloke ho hloekisa le ho theola, le ho fokotsa litšenyehelo tsa ts'ebetso;

(2) Bophara ba phala ea reactor bo lula bo le teng, molao-motheo o tobileng oa "pass-pass" o amoheloa, ha ho na mokhoa o rarahaneng oa ho fepa ka mahlakoreng, mochine oa motlakase le moralo oa tšehetso o bonolo, 'me letsete le tlaase;

(3) baki ea reactor e pholile ka metsi a batang, a ka hlahisang mouoane ka sehlahisoa;

(4) Tšebeliso ea "peroxide initiator", sehlahisoa sa gel se nyane, ha se na masala a ts'ebetso, ts'ireletso ea tikoloho e ntle;Ho ile ha etsoa li-oligomer tse fokolang, 'me mokhoa oa ho tsosolosa ha khase e potolohang o ile oa nolofalloa.

(5) Maemo a matle a ts'ebetso le ho se feto-fetohe ha khatello nakong ea polymerization ho etsa hore lihlahisoa tsa boleng bo holimo, haholo-holo lihlahisoa tsa filimi, tse nang le thepa e ntle ea optical le thepa ea ho sebetsa, li ka hlahisa bonyane ba botenya ba lifilimi tsa 10μm, empa mofuta oa sehlahisoa o moqotetsane, ha e khone ho hlahisa lihlahisoa tsa copolymer (EVA) tse nang le index e tlase ea ho qhibiliha.

Theknoloji ea tlhahiso ea polyethylene e tlaase ka mokhoa oa autoclave

Ts'ebetso ea autoclave e sebelisa tanka ea tanka e nang le sistimi e susumetsang, karolelano ea likarolo e ka tloha ho 2: 1 ho isa ho 20: 1, bophahamo ba tanka ea tanka ke 0.75 ~ 3m3.Mocheso oa karabelo ka kakaretso ke 150 ~ 300 ℃, khatello ea karabelo hangata ke 130 ~ 200MPa, sekhahla sa ho sokoloha ke 15% ~ 21%.

Kaha mochine oa kettle ke sekepe se nang le marako a teteaneng, mocheso oa mocheso ka lerako la motlakase o thibetsoe ho feta mochine oa tubular, kahoo karabelo e hlile e le mokhoa oa adiabatic, 'me ha ho mocheso o totobetseng o tlosoa ho tloha mochineng.The karabelo mocheso e haholo-holo laoloa ke multi-ntlha ente ea batang ethylene fepa ka ho leka-lekana karabelo mocheso.Reactor e na le mochini o tsamaisang motlakase ho etsa motsoako ka junifomo ea reactor le ho qoba libaka tse chesang tsa lehae.The initiator ke organic peroxide, e ka enteng libakeng tse fapaneng ho latela tataiso ea axial ea reactor ho etsa likarolo tse ngata tsa karabelo ka mocheso o fapaneng oa ts'ebetso.Ha ho na ho kopanya lipakeng tsa likarolo tsa karabelo, ts'ebetso e feto-fetohang le mefuta e mengata ea lihlahisoa, e ka hlahisang copolymerized EVA e nang le litaba tse fihlang ho 40% tsa vinyl acetate.

Mokhoa oa Lupotech A

Lupotech A e sebelisa tanka e ts'oaretsoeng, bophahamo ba tanka ke 1.2m3, lisebelisoa tse tala le initiator li kenngoa ka har'a mochini ka lintlha tse ngata, khatello ea karabelo ke 210 ~ 246MPa, mocheso o phahameng ka ho fetesisa ke 285 ℃, regulator ke propylene kapa propane, e kenyellelitsoeng ke "conpressor inlet" ea bobeli, e ka hlahisa Mefuta e sa tšoaneng ea lihlahisoa tsa LDPE / EVA, Boima ba sehlahisoa ke 0.912 ~ 0.951g / cm3, melting index ke 0.2 ~ 800g / (10min), litaba tsa vinyl acetate li ka phahama. ho isa ho 40%, sekhahla sa phetoho ea tsela e le 'ngoe ea sekontiri ke 10% ~ 21%, tekanyo e kholo ea moralo o le mong oa mohala o ka fihla ho 12.5×104t/a.

LupotechA ts'ebetso e ke ke ea hlahisa feela resin e koahetsoeng ka extruded e nang le ketane e ngata ea makala le tšusumetso e ntle, empa hape e hlahisa lihlahisoa tse tšesaane tsa filimi tse nang le kabo e pharaletseng ea boima ba limolek'hule.Lenane la ho qhibiliha le boima ba lihlahisoa tsa LDPE / EVA li ka laoloa hantle ke tsamaiso ea taolo ea APC, 'me lihlahisoa tse tšoanang li ka fumanoa.Kenyelletso e ka sehloohong ea lapeng ea ts'ebetso ena ke Sirbon petrochemical, Yangzi petrochemical, Shanghai petrochemical, joalo-joalo, bokhoni ba sesebelisoa ke 10 × 104T / a.

Ts'ebetso ea kettle ea Exxon Mobil

Ts'ebetso ea tanka ea Exxon Mobil e nka tanka e ikemetseng ea 1.5m3 ea libaka tse ngata.Reactor e na le karolo e kholoanyane ea likarolo, nako e telele ea ho boloka nako, katleho e phahameng ea li-initiator le tlhahiso e fokolang ea lihlahisoa tsa limolek'hule, e leng se loketseng tlhahiso ea lihlahisoa tsa filimi tse tšesaane tse nang le boleng bo tšoanang le ts'ebetso ea tube.

Molaoli o fapane le mokhoa oa Exxon Mobil tube.Isobutene kapa n-butane e sebelisoa, e matlafalitsoeng ho 25 ~ 30MPa ka pompo ea diaphragm ea khatello e phahameng, e kenngoa ka makhetlo a mabeli ka har'a mochine oa compressor, 'me e kene ka mochine o nang le ethylene.

Lebelo la khatello ea reactor le pharalletse, 'me khatello e phahameng ea karabelo ke 200MPa, e ka hlahisang LDPE homopolymer e nang le index e tlase ea ho qhibiliha le EVA copolymer e nang le litaba tse phahameng tsa vinyl acetate.

Ts'ebetso ea tanka ea Exxon Mobil e ka hlahisa lihlahisoa tsa LDPE homopolymer tse nang le melting index ea 0.2 ~ 150g/ (10min) le boima ba 0.910 ~ 0.935g / cm3.Qhibiliha index 0.2 ~ 450g / (10min) vinyl acetate content ho fihlela ho 35% ethylene - vinyl acetate copolymer (EVA) lihlahisoa.Kenyelletso e kholo ea lehae ea ts'ebetso ena ke Lianhong Group (eo pele e neng e le Shandong Hauda), matla a sesebelisoa ke 10 × 104T / a, TRINA, matla a sesebelisoa ke 12 × 104T / a, joalo-joalo.