Ka kakaretso, tlhahisong eahydroxypropyl methylcellulose, cellulose ea k'hothone e hloekisitsoeng e phekoloa ka tharollo ea alkali ho 35-40°C ka halofo ea hora, e hatelloa, cellulose ea siloa, 'me ea tsofala ka nepo ho 35°C, e le hore likhoele tsa alkali tse fumanoeng li polymerized ka karolelano tekanyo e ka har'a sebaka se hlokahalang. Kenya alkali fiber ka ketleleng ea etherification, eketsa propylene oxide le methyl chloride ka lehlakoreng le leng, 'me u etherify ho 50-80 ℃ ka lihora tse 5 ho fihlela khatellong e phahameng ea hoo e ka bang 1.8 MPa. Ebe u eketsa hydrochloric acid le oxalic acid e lekaneng metsing a chesang ho 90 ° C ho hlatsoa thepa ho eketsa bophahamo. E qhibilihise ka centrifuge. Hlatsoa ho fihlela e sa nke lehlakore, ha metsi a ka har'a thepa a le ka tlase ho 60%, e omise ka phallo ea moea o chesang ho 130°C ho isa tlase ho 5%.
Alkalization: K'hothone e hloekisitsoeng ka phofo ka mor'a ho buloa e eketsoa ka har'a solvent e sa sebetseng, 'me e kenngoa tšebetsong ka alkali le metsi a bonolo ho kokobetsa lera la kristale la k'hothone e hloekisitsoeng, e leng se thusang ho kenella ha limolek'hule tsa moemeli ea etherifying le ho ntlafatsa ho tšoana ha karabelo ea etherification. Alkali e sebelisoang alkaliization ke hydroxide ea tšepe kapa motheo oa organic. Palo ea alkali e ekelitsoeng (ka boima, e tšoanang ka tlase) ke makhetlo a 0.1-0.6 a k'hothone e hloekisitsoeng, 'me palo ea metsi a bonolo ke makhetlo a 0.3-1.0 a k'hothone e hloekisitsoeng; solvent e sa sebetseng ke motsoako oa joala le hydrocarbon, 'me palo ea solvent e sa sebetseng e ekelitsoeng ke k'hothone e hloekisitsoeng. Makhetlo a 7-15: solvent e sa sebetseng e ka boela ea e-ba joala bo nang le liathomo tsa carbon tse 3-5 (joalo ka 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 alkaliization; nako ea alkaliization ke hoo e ka bang hora e le 'ngoe. Phetoho ea mocheso le nako e ka etsoa ho latela litlhoko tsa thepa le sehlahisoa.
Ho kenya ether: Kamora kalafo ea alkalization, tlas'a maemo a vacuum, ho kenya etherification ho 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 oa eketsoa habeli nakong ea ts'ebetso ea etherification.
Nako ea poso: Mmesa-28-2024