Lub pulping txheej txheem ntawm cov cellulose hais tau hais txog ntau kauj ruam ntawm cov cellulose ntawm cov khoom siv raw thiab tom qab ntawd hloov nws mus rau hauv cellulose neeg. Cov neeg hais daws cellulose yog cov sib xyaw ua ke nrog cov ntawv thov hauv ntau yam kev lag luam, suav nrog cov tshuaj, cov khoom noj, cov ntawv nyeem thiab kev tsim khoom. Lub pulping txheej txheem yog qhov tseem ceeb kom tau txais cov khoom zoo ntawm cellulose, cov khoom siv raw rau kev tsim cov cellulose muaj neeg ua haujlwm. Cov hauv qab no yog cov lus qhia ntxaws ntxaws ntawm lub cellulose ether pulping txheej txheem:
1. Raw Khoom Xaiv:
Lub pulping txheej txheem pib nrog xaiv cov ntaub ntawv raw muaj cov cellulose. Cov chaw muaj xws li ntoo, paj rwb, thiab lwm yam nroj tsuag fibers. Kev xaiv ntawm cov ntaub ntawv raw yog nyob ntawm cov yam xws li muaj peev xwm muaj, tus nqi thiab cov khoom xav tau.
2. Pulp ua txoj kev:
Muaj ntau txoj hauv kev ntawm cellulose pulping, feem ntau suav nrog tshuaj pulping thiab kho txhua yam pulping.
3. Tshuaj Txhuam Pulping:
Kraft pulping: cuam tshuam nrog kho cov ntoo chips nrog sib tov ntawm sodium hydroxide thiab sodium sulfide. Tus txheej txheem no yaj lub hnub ci, tawm hauv qab lub cellulosic fibers.
Sulfite pulping: Siv sulfurous acid los yog bisulfite los tsoo lub lignin hauv cov pub.
Organic Kev Txhim Kho Pulping: Siv cov kuab tshuaj ethanol xws li ethanol lossis methanol kom yaj lub tsev teev thiab cais cellulose fibers.
4. Neeg kho tshuab Pulping:
Pob zeb-hauv av ntoo pulping: cuam tshuam nrog sib tsoo ntoo ntawm lub pob zeb rau mechanically cais cov fibers.
Refinery Txhua yam Pulping: Siv cov neeg kho tshuab ua kom cais cov fibers los ntawm refining ntoo chips.
5. Tshuaj dawb:
Tom qab pulping, cellulose undergoes tus txheej txheem tshuaj dawb kom tshem tawm impurities thiab xim. Chlorine, chlorine dioxide, hydrogen peroxide lossis oxygen tuaj yeem siv thaum theem tshuaj dawb.
5 .. Cellulose Hloov Kho:
Tom qab muaj kev huv huv, cellulose tau hloov kho los ua cov neeg muaj kev hais daws cellulos. Cov hau kev uas suav nrog etherification, Estrification, Esterification thiab lwm yam kev tawm tsam los hloov lub cev thiab tshuaj ntawm cellulose.
6. Etheation txheej txheem:
Alkalization: kho cellulose nrog cov alkali (feem ntau sodium hydroxide) los tsim alkali cellulose.
Ntxiv rau cov neeg sawv cev: Alkaline cellulose reacts nrog aithiftion cov neeg sawv cev (xws li alkylene pawg neeg mus rau hauv cov qauv cellulose.
Neutralization: nruab nrab ntawm cov tshuaj tiv thaiv sib tov los txiav tawm cov tshuaj tiv thaiv thiab tau txais cov khoom xav tau xav tau ether cov khoom.
7. Ntxuav thiab ziab:
Lub cellulose khoom ether yog ntxuav kom tshem tawm cov khoom lag luam thiab impurities. Tom qab tu, cov khoom tau qhuav kom ua tiav cov ntsiab lus noo noo.
8. Sib Tsoo thiab Ntsuam Xyuas:
Cov cellulose qhuav yuav muaj cov neeg muaj peev xwm ua av kom tau txais cov me me qhov ntau thiab tsawg. Sieving yog siv los cais cov khoom ntawm qhov yuav tsum tau loj.
8. Tswjhwm Zoo:
Kev ntsuas kev tswj kom zoo yog tau ua los xyuas kom ntseeg tau tias cov neeg hais ua ke tau raws cov qauv teev tseg. Qhov no suav nrog kev xeem ntawm viscosity, qib ntawm hloov chaw, cov ntsiab lus noo noo thiab lwm yam tsis sib xws.
9. Ntim thiab xa khoom:
Qhov kawg cellulose ovht cov khoom lag luam yog ntim thiab faib rau ntau yam kev lag luam. Cov ntim ntim kom zoo kom ntseeg tau tias cov khoom lag luam zoo yog tswj xyuas thaum lub sijhawm tsheb thauj mus los.
Lub pulping txheej txheem ntawm cellulose ether yog cov txheej txheem sib txawv, tshuaj dawb, ntxuav, sib tsoo thiab tswj kev sib tsoo. Txhua kauj ruam yog qhov tseem ceeb hauv kev txiav txim siab qhov zoo thiab cov khoom ntawm lub cellulose ether ua, ua rau nws haum rau ntau cov ntawv thov. Kev ua txuj ci thev naus laus zis txuas ntxiv txhim kho thiab ua kom zoo dua cov txheej txheem kom nce cov txheej txheem ua tau zoo thiab muaj kev ruaj khov ntawm cellulose ntau lawm ether ntau lawm.
Lub Sijhawm Post: Jan-15-2024