Kev tsim cov txheej txheem ntawm ultra-high viscosity sodium carboxymethyl cellulose

1. Lub hauv paus ntsiab lus ntawm CMC ntau lawm

(1) Consumption quota (hloov txoj kev, xam ib tuj ntawm cov khoom): paj rwb linters, 62.5kg; ethanol, 317,2 kg; alkali (44.8%), 11.1 kg; monochloroacetic acid, 35.4 kg; 310.2 kg ntawm toluene

(2) Ntau lawm txoj cai thiab txoj kev? Alkaline cellulose yog tsim los ntawm cellulose thiab sodium hydroxide aqueous tov los yog sodium hydroxide aqueous ethanol tov, thiab ces reacted nrog monochloroacetic acid los yog sodium monochloroacetate kom tau ib tug crude khoom, thiab cov khoom alkaline qhuav, pulverized rau hauv kev lag luam muaj carboxymethyl cellulose (sodium ntsev vine. ). Cov khoom nyoos yog tom qab ntawd neutralized, ntxuav, thiab sodium chloride tshem tawm, ces qhuav thiab crushed kom tau refined sodium carboxymethyl cellulose. Cov tshuaj formula yog raws li nram no:

(C6H9O4-OH)4+nNaOH-(C6H9O4-ONa)n+nH2O

(3) Cov txheej txheem piav qhia

Cov cellulose yog crushed thiab tshem tawm nyob rau hauv ethanol, ntxiv lye nrog 30rain nyob rau hauv tas li stirring, khaws cia ntawm 28-32.°C, txias rau qhov kub tsawg, ntxiv monochloroacetic acid, kub txog 55°C rau 1.5h thiab teb rau 4h; Ntxiv acetic acid rau nruab nrab cov tshuaj tiv thaiv sib tov, cov khoom nyoos yog tau los ntawm kev sib cais cov kuab tshuaj, thiab cov khoom nyoos yog ntxuav ob zaug nrog cov kua methanol hauv cov khoom siv ntxhua khaub ncaws uas muaj lub tov khoom thiab lub centrifuge, thiab qhuav kom tau cov khoom.

CMC tov muaj viscosity siab, thiab kub hloov yuav tsis ua rau gelation.

2. Cov txheej txheem ntau lawm ntawm ultra-high viscosity sodium carboxymethyl cellulose

  Cov txheej txheem ntau lawm ntawm ultra-high viscosity sodium carboxymethyl cellulose.

kauj ruam:

(1) Muab cellulose, alkali thiab ethanol rau hauv alkalization kneader nyob rau hauv kev faib ua feem mus nqa tawm alkalization nyob rau hauv kev tiv thaiv ntawm nitrogen, thiab ces muab tso rau hauv etherifying tus neeg saib xyuas chloroacetic acid ethanol tov los pib etherify cov ntaub ntawv;

(2) Thauj cov ntaub ntawv saum toj no mus rau hauv lub etherification kneader los tswj qhov kub thiab txias lub sij hawm rau cov tshuaj tiv thaiv etherification, thiab thauj cov ntaub ntawv mus rau lub tank ntxhua tom qab cov tshuaj tiv thaiv etherification tiav;

(3) Ntxuav cov khoom siv tshuaj tiv thaiv etherification nrog dilute ethanol tov kom tshem tawm cov ntsev uas tsim los ntawm cov tshuaj tiv thaiv, kom cov purity ntawm cov khoom tuaj yeem ncav cuag ntau dua 99.5%;

(4) Tom qab ntawd cov khoom raug xa mus rau centrifugal nias, thiab cov khoom siv tau raug thauj mus rau lub stripper, thiab cov kuab tshuaj ethanol raug rho tawm los ntawm cov khoom siv los ntawm lub stripper;

(5) Cov khoom dhau los ntawm lub stripper nkag mus rau lub vibrating fluidized txaj kom qhuav kom tshem tawm cov dej ntau dhau, thiab tom qab ntawd crushes kom tau cov khoom. Qhov kom zoo dua yog tias cov txheej txheem zoo meej, cov khoom lag luam Performance index tuaj yeem ncav cuag viscosity ntawm 1% B hom> 10000mpa.s, thiab purity> 99.5%.

  Carboxymethyl cellulose yog ib qho derivative nrog ether qauv tau los ntawm kev hloov kho tshuaj ntawm natural cellulose. Cov pawg carboxyl ntawm cov saw molecular tuaj yeem tsim cov ntsev. Cov ntsev ntau tshaj plaws yog sodium ntsev, uas yog sodium carboxymethyl cellulose (Na -CMC), kev cai hu ua CMC, yog ionic ether. CMC yog cov hmoov fluidity siab, dawb los yog lub teeb daj nyob rau hauv tsos, tasteless, ntxhiab tsw, tsis muaj tshuaj lom, tsis-flammable, non-mildew, thiab ruaj khov rau lub teeb thiab kub.