Ilana iṣelọpọ ti iṣuu soda carboxymethyl cellulose iki ultra-ga

1. Ilana gbogbogbo ti iṣelọpọ CMC

(1) Iwọn lilo (ọna ti o ni iyọda, ti a ṣe iṣiro fun ton ti ọja): awọn linters owu, 62.5kg;ethanol, 317.2kg;alkali (44.8%), 11.1kg;monochloroacetic acid, 35.4kg;toluene, 310.2 kg,

(2) Ilana iṣelọpọ ati ọna?Alkaline cellulose ti wa ni se lati cellulose ati soda hydroxide olomi ojutu tabi sodium hydroxide olomi ethanol ojutu, ati ki o reacted pẹlu monochloroacetic acid tabi soda monochloroacetate lati gba a robi ọja, ati awọn ipilẹ ọja ti gbẹ , Pulverized sinu lopo wa carboxymethyl cellulose (sodium iyọ ajara. ).Ọja robi ti wa ni didoju, fo, ati yọ iṣuu soda kiloraidi kuro, lẹhinna gbẹ ati ki o fọ lati gba iṣuu soda carboxymethyl cellulose ti a ti mọ.Ilana kemikali jẹ bi atẹle:

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

(3) Apejuwe ilana

Awọn cellulose ti wa ni itemole ati daduro ni ethanol, fi lye pẹlu 30 ojo labẹ gbigbọn igbagbogbo, tọju ni 28-32°C, dara si iwọn otutu kekere, ṣafikun monochloroacetic acid, ooru to 55°C fun 1.5h ati fesi fun 4h;fi acetic acid lati yomi awọn lenu adalu , Awọn robi ọja ti wa ni gba nipa yiya sọtọ awọn epo, ati awọn robi ọja ti wa ni fo lemeji pẹlu kẹmika olomi ninu awọn fifọ ẹrọ kq a aladapo ati ki o kan centrifuge, ati ki o gbẹ lati gba awọn ọja.

Ojutu CMC ni iki giga, ati iyipada iwọn otutu kii yoo fa gelation.

2. Awọn ilana gbóògì ti olekenka-ga iki soda carboxymethyl cellulose

  Ilana iṣelọpọ ti iṣuu soda carboxymethyl cellulose iki ultra-giga.

igbese:

(1) Fi cellulose, alkali ati ethanol sinu alkalization kneader ni iwọn lati gbe alkalization labẹ aabo ti nitrogen, ati lẹhinna fi sinu etherifying oluranlowo chloroacetic acid ethanol ojutu lati ni ibẹrẹ etherify awọn ohun elo;

(2) Gbigbe awọn ohun elo ti o wa loke sinu etherification kneader lati ṣakoso iwọn otutu ati akoko ifarahan fun ifarabalẹ etherification, ati gbe awọn ohun elo lọ si apo fifọ lẹhin ti ifasilẹ etherification ti pari;

(3) Wẹ ohun elo ifasilẹ etherification pẹlu ojutu ethanol dilute lati yọ iyọ ti ipilẹṣẹ nipasẹ iṣesi, ki mimọ ọja le de diẹ sii ju 99.5%;

(4) Lẹhinna ohun elo naa ti tẹriba si titẹ centrifugal, ati awọn ohun elo ti o lagbara ti a gbe lọ si olutọpa, ati epo ethanol ti fa jade lati inu ohun elo naa nipasẹ olutọpa;

(5) Awọn ohun elo ti o kọja nipasẹ olutọpa naa wọ ibusun omi gbigbọn titaniji fun gbigbẹ lati yọ omi ti o pọ ju, ati lẹhinna fọ lati gba ọja naa.Anfani ni pe ilana naa jẹ pipe, atọka didara ọja le de iki ti 1% B iru> 10000mpa.s, ati mimọ> 99.5%.

  Carboxymethyl cellulose jẹ itọsẹ pẹlu eto ether ti a gba nipasẹ iyipada kemikali ti cellulose adayeba.Ẹgbẹ carboxyl lori ẹwọn molikula le ṣe iyọ kan.Iyọ ti o wọpọ julọ jẹ iyọ soda, eyun sodium carboxymethyl cellulose (Na -CMC), ti aṣa ti a npe ni CMC, jẹ ether ionic.CMC jẹ lulú olomi ti o ga, funfun tabi ofeefee ina ni irisi, aibikita, odorless, ti kii-majele ti, ti kii-flammable, ti kii-imuwodu, ati iduroṣinṣin si ina ati ooru.