Inqubo yokukhiqiza ye-ultra-high viscosity sodium carboxymethyl cellulose

1. Umgomo ojwayelekile wokukhiqizwa kwe-CMC

(1) Isilinganiso sokusetshenziswa (indlela yokuncibilikisa, ibalwa ngethani ngalinye lomkhiqizo): amalitha kakotini, 62.5kg; i-ethanol, 317.2kg; i-alkali (44.8%), 11.1kg; monochloroacetic acid, 35.4kg; i-toluene, 310.2kg,

(2) Isimiso sokukhiqiza nendlela? I-alkaline cellulose yenziwa nge-cellulose ne-sodium hydroxide aqueous solution noma i-sodium hydroxide aqueous ethanol solution, bese isabela nge-monochloroacetic acid noma i-sodium monochloroacetate ukuze kutholwe umkhiqizo ongahluziwe, futhi umkhiqizo we-alkaline uyomiswa, Ugaywe ube yi-carboxymethyl cellulose (umvini kasawoti we-sodium. ). Umkhiqizo ongahluziwe ube usuhlukaniswa, ugezwe, futhi i-sodium chloride ikhishwe, bese yomiswa futhi igaywe ukuze kutholwe i-sodium carboxymethyl cellulose ecolisisiwe. Ifomula yamakhemikhali imi kanje:

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

(3) Incazelo yenqubo

I-cellulose iyachotshozwa futhi imisiwe ku-ethanol, engeza i-lye nemvula engu-30 ngaphansi kokunyakaziswa njalo, gcina ku-28-32°C, pholisa kuze kufike ezingeni lokushisa eliphansi, engeza i-monochloroacetic acid, ukushisa kufika ku-55°C isikhathi esingu-1.5h bese usabela u-4h; engeza i-acetic acid ukuze unciphise ingxube yokusabela , Umkhiqizo ongahluziwe utholakala ngokuhlukanisa i-solvent, futhi umkhiqizo ongahluziwe ugezwa kabili nge-methanol liquid emshinini wokuwasha owenziwe nge-mixer kanye ne-centrifuge, futhi uyomiswa ukuze uthole umkhiqizo.

Isixazululo se-CMC sine-viscosity ephezulu, futhi ukuguquka kwezinga lokushisa ngeke kubangele i-gelation.

2. Inqubo yokukhiqiza ye-ultra-high viscosity sodium carboxymethyl cellulose

  Inqubo yokukhiqiza ye-ultra-high viscosity sodium carboxymethyl cellulose.

isinyathelo:

(1) Faka i-cellulose, i-alkali ne-ethanol ku-alkalization kneader ngokulingana ukuze wenze i-alkalization ngaphansi kokuvikelwa kwe-nitrogen, bese ufaka isixazululo se-etherifying i-chloroacetic acid ethanol ukuze iqale ifake izinto ezisetshenziswayo;

(2) Thutha izinto ezingenhla ziyise ku-etherification kneader ukulawula izinga lokushisa nesikhathi sokusabela ukuze kutholakale i-etherification, futhi zithuthe izinto ezisetshenziswayo ziye ethangini lokuwasha ngemva kokuqedwa kokufakwa kwe-etherification;

(3) Geza i-etherification reaction material nge-dilute ethanol solution ukuze ususe usawoti okhiqizwa ukusabela, ukuze ubumsulwa bomkhiqizo bufinyelele ngaphezu kuka-99.5%;

(4) Khona-ke impahla ingaphansi kokucindezelwa kwe-centrifugal, futhi impahla eqinile ithuthelwa ku-stripper, futhi i-solvent ye-ethanol ikhishwa ezintweni ngokusebenzisa i-stripper;

(5) Izinto ezidlule ku-stripper zingena kumbhede omanzi odlidlizayo ukuze zomiswe ukuze zikhiphe amanzi amaningi, bese ziyachoboza ukuze kutholwe umkhiqizo. Inzuzo ukuthi inqubo iphelele, inkomba yekhwalithi yomkhiqizo ingafinyelela ku-viscosity ye-1% B uhlobo> 10000mpa.s, kanye nobumsulwa> 99.5%.

  I-Carboxymethyl cellulose iphuma ngesakhiwo se-ether esitholwe ngokuguqulwa kwamakhemikhali kwe-cellulose yemvelo. Iqembu le-carboxyl ochungechungeni lwe-molecular lingakha usawoti. Usawoti ovame kakhulu usawoti we-sodium, okungukuthi i-sodium carboxymethyl cellulose (Na -CMC), ngokuvamile ebizwa ngokuthi i-CMC, i-ether ye-ionic. I-CMC iyimpushana enoketshezi oluningi, emhlophe noma ephuzi ngokukhanyayo, ayinambitheki, ayinaphunga, ayinabuthi, ayishi, ayinasikhutha, futhi azinzile ekukhanyeni nasekushiseni.