Ka kakaretso, ka ho kopanya hahydroxypropyl methylcellulose, selulose e hloekisitsoeng ea k'hothone e phekoloa ka tharollo ea alkali ho 35-40 ° C bakeng sa halofo ea hora, e hatelloa, selulose e silafatsoa, 'me ka ho loketseng e tsofetse ho 35 ° C, e le hore likhoele tse fumanoeng tsa alkali li na le tekanyo ea polymerized ka hare ho se hlokahalang. mefuta-futa. Kenya fiber ea alkali ka har'a kettle ea etherification, eketsa propylene oxide le methyl chloride ka lehlakoreng le leng, 'me u etherify ho 50-80 ℃ lihora tse 5 ho khatello e phahameng ea hoo e ka bang 1.8 MPa. Ebe u eketsa palo e loketseng ea hydrochloric acid le oxalic acid ho metsi a chesang a 90 ° C ho hlatsoa thepa ho atolosa molumo. Dehydrate e nang le centrifuge. Hlatsoa ho fihlela u sa nke lehlakore, ha metsi a ka har'a thepa a le ka tlase ho 60%, o omise ka moea o chesang o tsoang ho 130 ° C ho ea tlase ho 5%.
Alkalization: K'hothone e hloekisitsoeng e phofshoana ka mor'a ho buloa e kenngoa ka har'a motsoako oa inert, 'me o kenngoa ka alkali le metsi a bonolo ho ruruha lesela la kristale la k'hothone e hloekisitsoeng, e leng se thusang ho kenella ha limolek'hule tsa etherifying agent le ho ntlafatsa ho tšoana ha karabelo ea etherification. . Alkali e sebelisoang ho alkalization ke tšepe ea hydroxide kapa setsi sa tlhaho. Palo ea alkali e ekelitsoeng (ka boima, e tšoanang ka tlase) ke makhetlo a 0.1-0.6 a k'hothone e hloekisitsoeng, 'me boholo ba metsi a bonolo ke makhetlo a 0.3-1.0 a k'hothone e hloekisitsoeng; solvent inert ke motsoako oa joala le hydrocarbon, 'me palo ea solvent inert e kenyelletsoeng ke k'hothone e hloekisitsoeng. 7-15 linako tse ling: solvent inert e ka boela ea e-ba joala bo nang le liathomo tsa carbon tse 3-5 (tse kang joala, propanol), acetone. E ka boela ea e-ba li-hydrocarbon tsa aliphatic le li-hydrocarbon tse nkhang hamonate; mocheso o lokela ho laoloa ka hare ho 0-35 ° C nakong ea alkalization; nako ea alkalization ke hoo e ka bang 1hr. Tokiso ea mocheso le nako e ka khethoa ho latela litlhoko tsa thepa le sehlahisoa.
Etherification: Ka mor'a phekolo ea alkalization, tlas'a maemo a vacuum, etherification e etsoa ka ho eketsa moemeli oa etherifying, 'me moemeli oa etherifying ke propylene oxide. E le ho fokotsa tšebeliso ea moemeli oa etherifying, moemeli oa etherifying o ile a eketsoa habeli nakong ea ts'ebetso ea etherification.
Nako ea poso: Apr-28-2024