Hemc (Hydroxyethy cellulose) yog cellule cellulose ether derivative dav siv hauv kev tsim kho, tshuaj, khoom noj thiab lwm daim teb. Hauv nws cov txheej txheem ntau lawm, muaj ntau cov ntsiab lus tseem ceeb los txiav txim siab los xyuas kom meej qhov zoo ntawm cov khoom lag luam thiab kev ua haujlwm ntawm kev tsim khoom.
1. Xaiv thiab npaj cov ntaub ntawv raw
1.1 cellulose
Cov khoom siv raw ntawm HEMC yog cov cellulose ntuj, feem ntau yog los ntawm ntoo pulp lossis paj rwb. Cov khoom zoo ntawm cellulose raw cov ntaub ntawv txiav txim siab qhov zoo ntawm cov khoom kawg. Yog li ntawd, lub purity, hnyav hnyav thiab qhov chaw ntawm cov khoom siv raw yog qhov tseem ceeb heev.
Purity: High-purity cellulose yuav tsum tau raug xaiv los txo qhov kev cuam tshuam ntawm cov impurities ntawm cov khoom lag luam.
Molecular qhov hnyav: cellulose ntawm cov hnyav molecular yuav cuam tshuam rau solubility thiab thov kev ua haujlwm ntawm HEMC.
Tau qhov twg los: Lub hauv paus ntawm cellulose (xws li ntoo pulp, paj rwb) txiav txim siab cov qauv thiab kev ua kom dawb huv ntawm lub cellulose saw.
1.2 sodium hydroxide (Naoh)
Sodium hydroxide yog siv rau kev ua kom tiav ntawm cellulose. Nws yuav tsum muaj siab huv thiab nws txoj kev xav yuav tsum tau nruj me ntsis tswj hwm kom ntseeg tau tias qhov kev sib txuam thiab kev ua haujlwm ntawm cov tshuaj tiv thaiv.
1.3 Ethylene Oxide
Qhov ua tau zoo thiab kev cuam tshuam ntawm ethylene oxide ncaj qha cuam tshuam rau cov degree ntawm kev tawm tsam kev tawm tsam. Kev tswj hwm nws cov kev coj dawb huv thiab cov tshuaj tiv thaiv pab tau txais cov qib xav tau kev hloov pauv thiab cov khoom lag luam.
1.4 Methyl chloride
Methylation yog ib kauj ruam tseem ceeb hauv kev tsim cov HEMC. Lub purity thiab cov tshuaj tiv thaiv cov kev mob ntawm methyl chloride muaj qhov cuam tshuam ncaj qha rau kev siv methylation.
2. Cov Txheej Txheem Ntau Lawm
2.1 Kev Kho Mob Ib Leeg
Kev kho mob ntawm cellulose nrog sodium pawg rau cov cellulose molecen ntau cov ethoxylation thiab methylation.
Qhov kub: feem ntau nqa tawm ntawm qhov ntsuas kub qis kom tsis txhob muaj cellulose dectradose.
Lub Sij Hawm: Lub sijhawm ua tiav lub sijhawm yuav tsum tau tswj kom ntseeg tau tias cov tshuaj tiv thaiv tau txaus tab sis tsis muaj ntau ntxiv.
2.2 Kev Tshawb Fawb Kev Tshawb Fawb
Ethoxylation yog hais txog qhov hloov chaw ntawm cov cellulose alkalized los ntawm ethylene oxide los tsim cov neeg hauv kev tawm tsam.
Qhov kub thiab txias thiab siab: qhov kev hloov ntsuas kub thiab siab yuav tsum tau nruj me ntsis tswj hwm kom ntseeg tau tias qhov kev sib txuam ntawm kev coj ntawm kev coj siab.
Lub sijhawm: Lub sijhawm dhau los: Lub sijhawm ntev lossis ntev dhau los yuav cuam tshuam degree hloov chaw thiab ua haujlwm ntawm cov khoom.
2.3 Methylation
Methylation ntawm cellulose los ntawm methyl chloride cov ntaub ntawv me me tshuaj me me-hloov cellulose derivatives.
Cov kev mob tshwm sim: suav nrog cov tshuaj kub, siab, cov kev xav tau, thiab lwm yam, txhua yam yuav tsum tau ua kom zoo.
Kev siv cov catalyst: catalysts tuaj yeem siv los txhim kho kev ua tau zoo thaum tsim nyog.
2.4 MINE HLOOV THIAB NTXUAV
Lub cellulose tom qab cov tshuaj tiv thaiv xav tau neutralize lub residual alkali thiab yuav tsum tau ntxuav tag nrho kom tshem cov reactants thiab cov khoom lag luam.
Ntxuav nruab nrab: dej los yog ethanol-dej sib tov feem ntau yog siv.
Ntxuav lub sij hawm thiab cov hau kev, yuav tsum tau hloov kho raws li xav tau kom ntseeg tau tias qhov kev tshem tawm ntawm cov seem.
2.5 Kom qhuav thiab crushing
Lub cellulose ntxuav tau yuav tsum tau qhuav thiab tsoo rau qhov tsim nyog particle loj rau kev siv tom ntej.
Ziab qhuav thiab lub sijhawm: yuav tsum tau sib npaug kom tsis txhob muaj cellulose dectradose.
CRUSHING CALCLE KAB TSEG: Yuav tsum hloov kho raws li cov cai thov.
3. Tswjhwm Zoo
3.1 Cov khoom lag luam kawm tiav
Cov kev ua tau ntawm Hemc yog ze ze rau cov qib hloov pauv (DS) thiab hloov chaw ua ke. Nws yuav tsum tau raug kuaj pom los ntawm kev sib nqus Nuclear sib xyaw (NMR), thiab lwm yam) thiab lwm yam thev naus laus zis.
3.2 solubility
Lub solubility ntawm HEMC yog qhov tseem ceeb ntsuas hauv nws cov ntawv thov. Kev xeem sib deev yuav tsum ua kom ntseeg tau tias nws solubility thiab viscire kev ua tau zoo hauv kev thov ib puag ncig.
3.3 Viscosity
Lub viscosity ntawm Hemc Ncaj Ncees cuam tshuam rau nws cov kev ua tau zoo hauv cov khoom kawg. Lub viscosity ntawm cov khoom yog ntsuas los ntawm kev siv cov visical lossis ib lub capillary vis.
3.4 Purity thiab cov seem
Cov seem ntawm cov reactivan thiab impurities nyob rau hauv cov khoom yuav cuam tshuam nws daim ntawv thov cov nyhuv thiab yuav tsum tau raug kuaj nruj thiab tswj tau.
4. Ib puag ncig thiab kev tswj hwm kev nyab xeeb
4.1 Kev Kho Mob Tawm
Lub pov tseg tau tsim thaum lub sijhawm cov txheej txheem ntau lawm yuav tsum tau kho kom tau txais kev tiv thaiv ib puag ncig.
Neutralization: Acid thiab Alkaline Wastewater xav tau neutralized.
Organic teeb meem Tshem Tawm: Siv roj ntsha lossis tshuaj lom neeg los kho cov organic teeb meem hauv dej wastewater.
4.2 roj pa hluav taws xob
Cov roj cua tsim tawm thaum lub sij hawm cov tshuaj tiv thaiv (xws li ethylene oxide thiab methyl chloride) yuav tsum tau sau thiab kho kom tiv thaiv kev ua qias tuaj thiab kho kom tsis txhob muaj kuab paug.
Kev nqus tau pej thuam: Cov pa roj teeb tau raug ntes thiab nruab nrab ntawm kev nqus cov yees.
Kev lim dej: Siv cov ntxaij lim dej siab siv kom tshem tawm cov khoom hauv cov roj.
4.3 Kev Tiv Thaiv Kev Nyab Xeeb
Cov tshuaj phom sij tau koom nrog kev siv tshuaj lom neeg, thiab kev ntsuas kev nyab xeeb yuav tsum tau ua.
Cov Khoom Pab Tiv Thaiv: Muab cov cuab yeej tiv thaiv tib neeg (PPE), xws li hnab looj tes, gooslles, thiab lwm yam.
Cua tshuab: Ua kom muaj cua zoo kom tshem tawm cov teeb meem roj.
4.4 Txheej Txheem Txhim Kho
Txo kev siv hluav taws xob thiab cov khoom siv raw khib nyiab thiab txhim kho ntau dhau los ntawm cov txheej txheem kev txhim kho thiab kev tswj tsis zoo.
5. Kev Lag Luam
5.1 Tus Nqi Tswj
Cov ntaub ntawv raw thiab kev siv zog tau noj yog cov khoom siv tseem ceeb ntawm kev tsim khoom. Cov nqi ntau lawm tuaj yeem raug txo los ntawm kev xaiv cov khoom lag luam tsim nyog thiab ua kom zoo siv hluav taws xob.
5.2 Khw Muag Khoom
Cov nplai ntau lawm thiab cov khoom lag luam tshwj xeeb yuav tsum tau hloov kho raws li kev ua lag luam thov kom ntseeg tau tias qhov siab tshaj nyiaj txiag.
5.3 Kev Ntsuam Xyuas Kev Ntsuam Xyuas
Ua kev sib tw kev sib tw ntsuas tsis tu ncua, cov tswv yim tsim khoom, thiab txhim kho kev ua lag luam kev sib tw.
6. Kev thev naus laus zis thev naus laus zis
6.1 txoj kev loj hlob tshiab
Nruam tsis tu ncua thiab saws cov txheej txheem tshiab los txhim kho cov khoom lag luam zoo thiab ntau lawm kev ua tau zoo. Piv txwv li, tsim cov catalysts tshiab lossis lwm yam tshuaj tiv thaiv.
6.2 Kev Txhim Kho Cov Khoom
Txhim kho cov khoom lag luam thiab hloov kho cov khoom raws li cov tswv yim cov neeg siv khoom thiab kev tsim tawm lag luam, qhov kev tsim kho ntawm cov qib sib txawv thiab hnyav.
6.3 Kev Tswj Tshuab
Los ntawm kev qhia cov tshuab tswj kev siv tshuab, cov kev txhawb nqa thiab muaj txiaj ntsig ntawm cov txheej txheem tsim khoom tuaj yeem hloov kho thiab tib neeg ua tsis tau zoo.
7. Cov kev cai thiab cov qauv
7.1 Cov Qauv Khoom Lag Luam
Lub hemc tsim nyog yuav tsum tau ua raws li cov qauv kev lag luam thiab kev tswj hwm cov cai, xws li ISO cov qauv, thiab lwm yam.
7.2 Cov kev cai ib puag ncig
Cov txheej txheem ntau lawm yuav tsum tau ua raws li cov kev cai ib puag ncig hauv zos, txo cov pa paug qias, thiab tiv thaiv ib puag ncig.
7.3 kev tswj hwm kev nyab xeeb
Cov txheej txheem ntau lawm yuav tsum tau ua raws li kev nyab xeeb kev tswj kev cai kom ntseeg tau kev nyab xeeb thiab kev ntseeg tau ntawm kev ua haujlwm Hoobkas.
Cov txheej txheem ntau lawm ntawm HEMC yog ib txoj kev nyuaj thiab muaj ntau txoj kev. Los ntawm RAW cov khoom siv, txheej txheem ntsuas kev ua kom zoo, kev tswj hwm kev nyab xeeb, ib puag ncig kev nyab xeeb, txhua qhov txuas yog qhov tseem ceeb. Los ntawm kev tswj hwm tsim nyog thiab kev txhim kho txuas ntxiv mus ntxiv, kev tsim kho cov khoom ua haujlwm txuas ntxiv thiab cov khoom lag luam zoo tau ua tau zoo kom tau raws li kev thov kev lag luam.
Lub Sijhawm Post: Feb-17-2025