Ilana iṣelọpọ HEMC hydroxyethyl methyl cellulose

Ilana iṣelọpọ HEMC hydroxyethyl methyl cellulose

Hydroxyethyl methyl cellulose HEMC le ṣee lo bi oluranlowo aabo colloidal, emulsifier ati dispersant nitori iṣẹ ṣiṣe dada rẹ ni ojutu olomi.Ipa ti hydroxyethyl methyl cellulose lori awọn ohun-ini simenti.Hydroxyethyl methyl cellulose jẹ aisi olfato, ti ko ni itọwo, lulú funfun ti ko ni majele ti o tuka ninu omi tutu lati ṣe afihan, ojutu alalepo.Pẹlu nipọn, adhesion, pipinka, emulsification, iṣelọpọ fiimu, idadoro, adsorption, gelling, iṣẹ dada, idaduro omi ati idaabobo colloid, bbl Omi ojutu le ṣee lo bi idaabobo colloid, emulsifier ati dispersant nitori iṣẹ ṣiṣe ti dada rẹ.Hydroxyethyl methyl cellulose olomi ojutu ni hydrophilicity ti o dara ati pe o jẹ oluranlowo idaduro omi daradara.

HEMCgbóògì ilana

Awọn kiikan discloses a igbaradi ọna fun hydroxyethyl methyl cellulose, eyi ti o nlo refaini owu bi aise ohun elo ati ki ethylene oxide bi etherifying oluranlowo lati mura hydroxyethyl methyl cellulose.Awọn ohun elo aise fun igbaradi ti hydroxyethyl methyl cellulose nipasẹ iwuwo jẹ: toluene ati adalu isopropanol 700 ~ 800 awọn ẹya bi epo, 30 ~ 40 awọn ẹya omi, iṣuu soda hydroxide 70 ~ 80 awọn ẹya, owu ti a ti tunṣe 80 ~ 85 awọn ẹya, ethylene oxide 20 ~ 28 awọn ẹya ara, methane kiloraidi 80 ~ 90 awọn ẹya ara, glacial acetic acid 16 ~ 19 awọn ẹya ara;Awọn igbesẹ pato jẹ bi atẹle:

Igbesẹ akọkọ ni lati ṣafikun toluene ati idapọ ọti isopropyl, omi, ati iṣuu soda hydroxide ninu kettle ifaseyin, ooru to 60 ~ 80 ℃, mu fun awọn iṣẹju 20 ~ 40;

Igbesẹ keji, alkalization: ohun elo ti wa ni tutu si 30 ~ 50 ℃, owu ti a ti tunṣe, toluene ati isopropyl oti adalu epo sokiri, igbale si - 0.006mpa, ti o kun pẹlu nitrogen fun awọn akoko 3 rirọpo, rirọpo ti alkalization, awọn ipo alkalization: akoko alkalization jẹ wakati 2, iwọn otutu alkalization jẹ 30 ℃-50 ℃;

Igbesẹ kẹta, etherification: lẹhin alkalization, a ti sọ riakito naa si 0.05-0.07mpa, ati ethylene oxide ati methane kiloraidi ni a fi kun fun awọn iṣẹju 30-50.Ipele akọkọ ti etherification: 40 ~ 60 ℃, 1.0 ~ 2.0Hour, titẹ ti wa ni iṣakoso laarin 0.15 0.3mpa;Ipele keji ti etherification: 60 ~ 90 ℃, 2.0 ~ 2.5 wakati, iṣakoso titẹ laarin 0.4- 0.8mpa;

Igbesẹ kẹrin, didoju: ṣafikun glacial acetic acid ti a wiwọn ni riakito ahoro ni ilosiwaju, tẹ sinu ohun elo etherized fun didoju, dide otutu si 75 ~ 80 ℃ fun ahoro, dide otutu si 102 ℃, PH iwari 6-8 Ṣe ipari ti itu;Kun 90 ℃ ~ 100 ℃ yiyipada osmosis ti fi sori ẹrọ omi tẹ ni kia kia ti a ṣe itọju ni ikoko dessolubilization;

Igbesẹ karun, fifọ centrifugal: igbesẹ kẹrin ti ohun elo nipasẹ iyapa centrifuge petele ajija, ipinya ti awọn ohun elo ti a gbe lọ si iyẹfun fifọ omi gbona ti a ti ṣaju, fifọ ohun elo;

Igbesẹ kẹfa, gbigbẹ centrifugal: ohun elo lẹhin fifọ ni a gbe sinu ẹrọ gbigbẹ nipasẹ centrifuge petele, ati ohun elo ti gbẹ ni 150 ~ 170 ℃.Awọn ohun elo ti o gbẹ ti wa ni fifun pa ati akopọ.

Akawe pẹlu awọn ti wa tẹlẹ gbóògì ọna ẹrọ ti cellulose ether, awọn kiikan nlo ethylene oxide bi etherification oluranlowo lati mura hydroxyethyl methyl cellulose, eyi ti o ni hydroxyethyl ẹgbẹ, ni o ni ti o dara imuwodu resistance, ti o dara iki iduroṣinṣin ati imuwodu resistance nigba ti o ti fipamọ fun igba pipẹ.Le ṣee lo dipo ether cellulose miiran.