Samar da tsari na matsananci-high danko sodium carboxymethyl cellulose

1. Babban ka'idar samar da CMC

(1) Ƙimar amfani (hanyar mai narkewa, ƙididdigewa ga tan na samfur): lilin auduga, 62.5kg; ethanol, 317.2kg; alkali (44.8%), 11.1kg; monochloroacetic acid, 35.4kg; toluene, 310.2 kg,

(2) Ƙa'idar samarwa da hanya? Alkaline cellulose an yi shi daga cellulose da sodium hydroxide ruwa mai ruwa bayani ko sodium hydroxide mai ruwa ethanol bayani, sa'an nan kuma amsa tare da monochloroacetic acid ko sodium monochloroacetate don samun wani danyen samfurin, da kuma alkaline samfurin ya bushe, Pulverized cikin kasuwanci samuwa carboxymethyl cellulose (sodium gishiri itacen inabi. ). Daga nan sai a cire danyen samfurin, a wanke, sannan a cire sodium chloride, sannan a bushe a nika shi don samun ingantaccen sodium carboxymethyl cellulose. Tsarin sinadaran shine kamar haka:

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

(3) Bayanin tsari

An murƙushe cellulose kuma an dakatar da shi a cikin ethanol, ƙara lye tare da ruwan sama 30 a ƙarƙashin motsawa akai-akai, kiyaye a 28-32°C, kwantar da hankali zuwa ƙananan zafin jiki, ƙara monochloroacetic acid, zafi har zuwa 55°C don 1.5h kuma amsa don 4h; ƙara acetic acid don neutralize da dauki cakuda , Ana samun danyen samfurin ta hanyar rabuwa da sauran ƙarfi, kuma an wanke samfurin sau biyu tare da ruwa na methanol a cikin kayan wankewa wanda ya hada da mahaɗa da centrifuge, kuma ya bushe don samun samfurin.

Maganin CMC yana da babban danko, kuma canjin zafin jiki ba zai haifar da gelation ba.

2. Tsarin samarwa na matsananci-high danko sodium carboxymethyl cellulose

  Tsarin samarwa na ultra-high danko sodium carboxymethyl cellulose.

mataki:

(1) Saka cellulose, alkali da ethanol a cikin alkalisation kneader daidai gwargwado don gudanar da alkalization a karkashin kariya na nitrogen, sa'an nan kuma sanya a cikin etherifying wakili chloroacetic acid ethanol bayani da farko etherify kayan;

(2) Shigar da abubuwan da ke sama a cikin kneader na etherification don sarrafa zafin jiki da lokacin amsawa don amsawar etherification, da kuma jigilar kayan zuwa tankin wanka bayan an kammala aikin etherification;

(3) Wanke kayan amsawar etherification tare da maganin ethanol dilute don cire gishirin da aka samu ta hanyar amsawa, don haka tsarkin samfurin zai iya kaiwa fiye da 99.5%;

(4) Sa'an nan kuma an sanya kayan aiki zuwa matsi na centrifugal, kuma ana jigilar kayan daɗaɗɗen kayan aiki zuwa mai ɗorewa, kuma an fitar da sinadarin ethanol daga kayan ta hanyar mai cirewa;

(5) Abubuwan da ke wucewa ta cikin tsiri yana shiga cikin gado mai girgiza ruwa don bushewa don cire ruwa mai yawa, sannan ya murkushe don samun samfurin. Amfanin shine cewa tsarin yana da cikakke, ƙimar ingancin samfurin na iya kaiwa danko na nau'in 1% B> 10000mpa.s, da tsabta> 99.5%.

  Carboxymethyl cellulose wani abin da aka samo shi ne tare da tsarin ether wanda aka samo ta hanyar gyaran sinadarai na cellulose na halitta. Ƙungiyar carboxyl a kan sarkar kwayoyin halitta na iya samar da gishiri. Mafi yawan gishiri shine gishirin sodium, wato sodium carboxymethyl cellulose (Na -CMC), wanda aka saba kira CMC, shine ether ion. CMC babban foda ne mai ruwa, fari ko launin rawaya mai haske a bayyanar, maras ɗanɗano, mara wari, mara guba, mara ƙonewa, mara ƙazanta, kuma barga zuwa haske da zafi.