Kev lag luam tsim khoom ntawm ethylene glycol

Cov txheej txheem:

Kev lag luam tsim khoom ntawm ethylene glycol
Kev lag luam tsim khoom ntawm ethylene glycol

Video: Kev lag luam tsim khoom ntawm ethylene glycol

Video: Kev lag luam tsim khoom ntawm ethylene glycol
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Ethylene glycol yog cov roj me ntsis, tsis muaj ntxhiab, kua nplaum. Nws yog heev soluble nyob rau hauv cawv, dej, acetone thiab turpentine. Ethylene glycol yog lub hauv paus rau tsheb thiab tsev neeg cov tshuaj tiv thaiv kab mob, vim nws txo qis cov dej khov ntawm cov dej thiab cov tshuaj aqueous. Qhov tseeb nthuav yog tias txawm tias cov kua dej khov tsis khov, tig mus rau hauv dej khov, tab sis tsuas yog xoob. Tsis tas li ntawd, ethylene glycol aqueous cov ntsiab lus tsis nthuav dav thiab yog li tsis txhob ua puas rau cov kav dej thiab lub tshuab hluav taws xob hauv lub tsheb.

Tau txais ethylene glycol
Tau txais ethylene glycol

Cov tshuaj no yog hygroscopic heev, uas yog, nws absorbs dej zoo los ntawm ib puag ncig (cua, ntau yam gases). Kev tsim khoom lag luam ntawm ethylene glycol tau tsim los ntawm ntau lub tuam txhab tshuaj. Nws yuav tsum nco ntsoov tias cov tshuaj no yog tshuaj lom, txawm tias nws muaj qab zib qab qab. Yog li ntawd, thaum sib tham nrog nws, koj yuav tsum tau ceev faj. Vapors ntawm cov tshuaj no tsis muaj tshuaj lom thiab tsuas yog ua rau muaj kev phom sij rau kev noj qab haus huv yog tias lawv siv sijhawm ntev.nqus tau. Ethylene glycol yog qhov sib xyaw ua ke. Qhov siab ntawm nws cov vapors hauv huab cua yog tawg, tab sis ethylene glycol poob cov khoom no thaum tov nrog dej.

Kev npaj ntawm ethylene glycol los ntawm ethylene
Kev npaj ntawm ethylene glycol los ntawm ethylene

Daim ntawv thov

Ethylene glycol yog siv rau hauv ntau qhov chaw thiab kev lag luam: tsheb, tshuaj, aviation, textile, hluav taws xob, roj thiab roj. Ib qho tseem ceeb tshaj plaws ntawm kev siv cov tshuaj no yog kev tsim cov coolants thiab antifreezes. Vim qhov kev thov siab, kev tsim khoom ntawm ethylene glycol tau dhau los ua qhov loj. Cov khoom no tuaj yeem siv los ua cov kuab tshuaj rau cov khoom pleev xim.

Txoj kev kom tau txais ethylene glycol

Muaj ntau txoj hauv kev kom tau txais cov tshuaj no, tab sis tsis yog txhua tus ntawm lawv tsim nyog rau kev tsim khoom lag luam. Ib txoj hauv kev nrov tshaj plaws yog kom tau ethylene glycol los ntawm ethylene los ntawm oxidizing tom kawg nrog oxygen nyob rau hauv lub xub ntiag ntawm cov nyiaj catalyst, thiab tom qab ntawd hydration. Txawm li cas los xij, lwm cov txheej txheem tseem xav tau.

Cov txheej txheem kom tau txais ethylene glycol
Cov txheej txheem kom tau txais ethylene glycol

Kev tsim cov ethylene glycol los ntawm hydrolysis ntawm ethylene chlorohydrin. Nyob rau hauv ob qho tib si, ethylene oxide hydration cov tshuaj tiv thaiv yog nqa tawm nyob rau hauv lub xub ntiag ntawm catalysts thiab nyob rau hauv lub siab kub. Nyob rau hauv cov ntaub ntawv tseem muaj ib txoj hauv kev uas tsim cov ethylene glycol yog ua los ntawm kev sib cuam tshuam ntawm dej, formaldehyde thiab carbon monoxide. Glycolic acid tau txais thawj theem yog raug rau esterification thiabtxais ether. Tom qab ntawd nws yog hydrogenated rau ethylene glycol. Cov txheej txheem no yog siv hauv Tebchaws Meskas.

Cov khoom tau raug ntxuav kom huv si, vim tias txawm tias cov ntsiab lus me me ntawm cov neeg sab nrauv impurities cuam tshuam rau nws cov khoom. Piv txwv li, nyob rau hauv lub xub ntiag ntawm cov khoom xws li polyglycols thiab diethylene glycol nyob rau hauv muaj pes tsawg leeg ntawm ethylene glycol, nws thermal stability yog ho txo. Yog li ntawd, hauv cov khoom lag luam zoo, feem pua ntawm kev sib txuas ntawm cov neeg thib peb yuav tsum tsawg heev. Qhov no yog qhov tseeb tshwj xeeb rau cov tshuaj chlorine-muaj tshuaj thiab aldehydes. Qhov loj feem ntawm lub ntsiab compound yuav tsum yog tsawg kawg yog 99.5%.

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