Feem ntau, hauv synthesis ntawmHydroxyPropyyl Methylcellulose, lub chaw ua si cellulose yog kho nrog alkali daws ntawm 35-40 ° C rau ib nrab ib teev yog qhov muaj hnub nyoog alkali ntau yam. Tso cov alkali mus rau hauv lub hwj txwv herthification, ntxiv rau cov roj pleev thiab methyl strangene oxide thiab EThery) Tom qab ntawd ntxiv qhov tsim nyog ntawm hydrochloric acid thiab oxalic acid rau cov dej kub ntawm 90 ° C kom ntxuav cov khoom kom nthuav cov ntim. Lub cev qhuav dej nrog ib qho centrifuge. Ntxuav kom txog thaum nruab nrab, thaum cov ntsiab lus dej hauv cov khoom siv tsawg dua 60%, qhuav nws nrog cov huab cua kub kub ntawm 130 ° C kom tsawg dua 5%.
Alkalization: Cov hmoov ua kom zoo nkauj paj rwb tom qab qhib ntxiv rau hauv cov kua txiv molecules, uas yog ua kom muaj kev sib txawv ntawm lub hertification cov tshuaj tiv thaiv Cov. Lub alkali siv nyob rau hauv lub alkalization yog hlau hydroxide lossis ib qho organic puag. Tus nqi ntawm alkali ntxiv (los ntawm huab hwm coj, tib yam hauv qab) yog 0.1-0.6 lub sij hawm uas ntawm cov paj rwb Refined, thiab cov nyiaj ntawm cov muag muag yog 0.3-1.0 zaug uas ntawm recined rwb rwb; Cov kuab tshuaj inert yog kev sib xyaw ntawm dej cawv thiab hydrocarbon, thiab tus nqi ntawm cov kuab tshuaj ntxiv yog cov paj rwb redined. 7-15 Times: Cov kuab tshuaj hauv Inert kuj tseem tuaj yeem yog cawv nrog 3-5 carbon atoms (xws li dej cawv, propanol), acetone. Nws kuj tseem tuaj yeem yog cov pob zeb roj av thiab cov ntxhiab hydrocarbons; Qhov kub yuav tsum tau tswj tsis pub dhau 0-35 ° C thaum lub sijhawm Alkalization; Lub sijhawm Alkalization yog li 1hr. Kev hloov kho ntawm qhov kub thiab sijhawm tuaj yeem txiav txim siab raws li cov kev xav tau ntawm cov khoom siv thiab khoom.
Ethetification: kev kho mob ua kev siv lub tshuab nqus, etherification yog nqa los ntawm kev ntxiv tus neeg sawv cev etherifying yog propylene oxide. Txhawm rau kom txo qis kev noj ntawm lub etherifyen tus neeg sawv cev, tus neeg sawv cev lub sijhawm tau ntxiv rau ob zaug thaum lub sij hawm etherification.
Lub Sijhawm Post: Apr-28-2024