Cumene Process yog dab tsi?
Cov txheej txheem Cumene yog ib txoj hauv kev tseem ceeb rau kev tsim khoom ntawmphenol(C₆H₅OH). Cov txheej txheem no siv cumene ua raw khoom los tsim phenol los ntawm hydroxylation nyob rau hauv tej yam kev mob. Vim nws cov thev naus laus zis paub tab, tus nqi qis, thiab cov khoom lag luam zoo, cov txheej txheem cumene rau phenol yog siv dav hauv kev lag luam tshuaj.
Kab lus no yuav tshuaj xyuas lub hauv paus ntsiab lus thiab cov kauj ruam ntawm kev tsim cov phenol los ntawm cov txheej txheem cumene kom ntxaws, pab cov neeg nyeem kom nkag siab txog qhov tseem ceeb ntawm cov cuab yeej siv tshuaj lom neeg no.
Reaction Principple of the Cumene Process
Cov tshuaj tiv thaiv tseem ceeb hauv phenol ntau lawm los ntawm cov txheej txheem cumene yog hydroxylation ntawm cumene. Lub hauv paus ntsiab lus yog tias pawg methyl nyob rau hauv cumene molecule yog hloov los ntawm ib pawg hydroxyl nyob rau hauv acidic tej yam kev mob los tsim phenol.
Tshwj xeeb, cumene (C₆H₅CH(CH₃)₂) reacts nrog concentrated sulfuric acid (H₂SO₄) nyob rau hauv cua sov los tsim p-isopropylphenol (C₆H₅C(OH)H(CH₃)₂) thiab ib tug me me ntawm sulfate los ntawm cov khoom. Tom qab ntawd, p-isopropylphenol hloov mus rau phenol (C₆H₅OH) los ntawm cov tshuaj tiv thaiv hydrolysis. Tag nrho cov tshuaj sib npaug rau cov tshuaj tiv thaiv yog raws li nram no:
C₆H₅CH(CH₃)₂ + H₂SO₄ → C₆H₅C(OH)H(CH₃)₂ + HSO₄⁻
C₆H₅C(OH)H(CH₃)₂ + 3H₂O → 2C₆H₅OH + CH₄
Nws tuaj yeem pom los ntawm cov lus teb saum toj no uas tus yuam sij rau cov txheej txheem cumene yog nyob rau hauv cov tshuaj tiv thaiv hydroxylation nyob rau hauv acidic tej yam kev mob thiab tom qab hydrolysis cov tshuaj tiv thaiv. Sulfuric acid plays lub luag haujlwm tseem ceeb hauv kev ua kom muaj zog thoob plaws hauv cov txheej txheem.
Txheej txheem txheej txheem Cumene
Cov txheej txheem tshwj xeeb ntws rau phenol ntau lawm los ntawm cov txheej txheem cumene tuaj yeem muab faib ua cov kauj ruam tseem ceeb hauv qab no:
1. Raw Material Preparation thiab Formulation
Thawj kauj ruam hauv kev tsim phenol los ntawm cov txheej txheem cumene yog kev npaj thiab tsim cov khoom siv raw. Cumene, cov khoom siv tseem ceeb ntawm cov txheej txheem no, yuav tsum tau ua kom huv si ua ntej los ntawm distillation kom ntseeg tau tias nws cov purity ncav cuag ntau dua 99%. Concentrated sulfuric acid (feem ntau nrog ib tug concentration ntawm 98%) yog siv los ua catalyst, ua lub luag haujlwm tseem ceeb hauv cov tshuaj tiv thaiv. Txhawm rau txhim kho cov tshuaj tiv thaiv kev ua haujlwm, ib qho me me ntawm cov dej ntxiv rau cumene los txhawb kev tawg ntawm sulfuric acid thiab kev nce qib ntawm cov tshuaj tiv thaiv.
2. Hydroxylation Reaction
Hauv theem hydroxylation cov tshuaj tiv thaiv, cumene thiab concentrated sulfuric acid yog tov rau hauv lub reactor thiab rhuab mus rau 100-130 ° C. Nyob rau hauv acidic tej yam kev mob, pawg methyl nyob rau hauv lub cumene molecule undergoes hydroxylation los ua p-isopropylphenol thiab sulfate by-products. Cov tshuaj tiv thaiv no yog cov tshuaj tiv thaiv exothermic, thiab cov tshuaj tiv thaiv kub thiab nplawm nrawm yuav tsum tau tswj xyuas kom ntseeg tau tias qhov sib xws thiab ruaj khov ntawm cov tshuaj tiv thaiv.
3. Hydrolysis Reaction
Tom qab cov tshuaj tiv thaiv hydroxylation tiav lawm, cov khoom yuav tsum tau txais cov tshuaj tiv thaiv hydrolysis, nws lub hom phiaj yog hloov p-isopropylphenol rau hauv phenol. Lub sijhawm no, cov dej ntau ntxiv rau cov tshuaj tiv thaiv sib xyaw, kom p-isopropylphenol nkag mus rau cov tshuaj tiv thaiv hydrolysis nrog dej los tsim cov roj phenol thiab methane.
4. Neutralization thiab kev sib cais
Tom qab cov tshuaj tiv thaiv hydrolysis tiav, muaj ntau ntawm sulfuric acid thiab sulfate by-products nyob rau hauv lub cev. Txhawm rau tshem tawm cov kua qaub no, cov tshuaj alkaline (xws li sodium hydroxide lossis calcium hydroxide) ntxiv rau cov tshuaj tiv thaiv tsis zoo, tsim cov sulfates thiab dej. Tom qab ntawd, phenol raug cais los ntawm cov khoom siv los ntawm kev sib cais stratification lossis distillation technology.
5. Refining thiab Purification
Cov impurities nyob rau hauv crude phenol raug tshem tawm los ntawm purification txheej txheem xws li distillation kom tau high-purity phenol khoom. Thaum lub sij hawm refining txheej txheem, cov tshuaj tiv thaiv tej yam kev mob kuj yuav tsum tau nruj me ntsis tswj xyuas kom meej tias qhov zoo thiab purity ntawm phenol ua tau raws li cov qauv kev lag luam.
Qhov zoo thiab kev siv ntawm Cumene txheej txheem
Cov txheej txheem cumene rau phenol ntau lawm muaj qhov zoo hauv qab no:
Cov tshuaj tiv thaiv me me:Piv nrog cov tshuaj phenol ntau lawm, cov txheej txheem cumene muaj cov tshuaj tiv thaiv me me thiab cov txheej txheem tsim khoom muaj kev nyab xeeb dua.
Ntau cov khoom siv raw:Cumene tuaj yeem tau txais los ntawm cov khoom lag luam ntawm refineries, uas ua rau cov nqi raw khoom tsawg.
High khoom purity:Los ntawm kev tswj cov txheej txheem meej, purity thiab zoo ntawm phenol tuaj yeem ncav cuag qib siab.
Tam sim no, phenol ua los ntawm cov txheej txheem cumene yog dav siv nyob rau hauv kev tsim khoom ntawm ntau yam tshuaj xws li phenolic resins, epoxy resins, thiab nylon, nrog rau kev lag luam tsis tu ncua.
Cov ntsiab lus
Cov txheej txheem cumene rau kev tsim cov phenol yog cov txheej txheem tsim tau zoo thiab kev lag luam, nrog rau nws cov tub ntxhais yog hydroxylation ntawm cumene thiab cov tshuaj tiv thaiv hydrolysis tom qab. Los ntawm cov kauj ruam xws li kev npaj cov khoom siv raw, cov tshuaj tiv thaiv hydroxylation, cov tshuaj tiv thaiv hydrolysis, kev kho nruab nrab, thiab kev ua kom huv thiab ua kom huv, cov khoom siv phenol siab tuaj yeem ua tiav thaum kawg.
Nrog rau kev loj hlob tsis tu ncua ntawm thoob ntiaj teb kev thov rau cov khoom siv tshuaj, thev naus laus zis ntawm phenol ntau lawm los ntawm cov txheej txheem cumene yuav ua kom zoo dua qub, muab kev txhawb nqa tseem ceeb rau kev txhim kho cov kev lag luam ntsig txog.
Post lub sij hawm: Jun-23-2025
