izindaba

Ngokuyisisekelo, inqubo yokusabela yawo wonke ama-carbohydrate ahlanganiswe nguFischer nge-alkyl glycosides ingancishiswa ibe izinhlobo ezimbili zezinqubo, okungukuthi, ukuhlanganiswa okuqondile kanye ne-transacetalization. Kuzo zombili izimo, ukusabela kungase kuqhubeke ngamaqoqo noma ngokuqhubekayo.
Ngaphansi kokuhlanganiswa okuqondile, i-carbohydrate ihlangana ngokuqondile notshwala obunamafutha ukuze yakhe i-alkyl polyglycoside ye-long-chain edingekayo. I-carbohydrate esetshenziswayo ngokuvamile yomiswa ngaphambi kokusabela kwangempela (isibonelo ukususa amanzi ayikristalu uma kwenzeka kuba ne-glucose monohydrate=dextrose). Lesi sinyathelo sokumisa sinciphisa ukusabela okuseceleni okwenzeka lapho kukhona amanzi.
Ekuhlanganiseni okuqondile, i-monomer eqinile yohlobo lwe-glucose isetshenziswa njenge-fine particulate solid.Njengoba ukusabela kuwukusabela okungalingani okuqinile/okuwuketshezi, okuqinile kufanele kumiswe ngokuphelele otshwaleni.
Isiraphu ye-glucose eyonakele kakhulu (DE>96; DE=Dextrose okulingana) ingasabela ekuhlanganiseni okuqondile okulungisiwe. ukusetshenziswa kwesincibilikisi sesibili kanye/noma okokuthambisa (ngokwesibonelo i-alkyl polyglycoside) kunikeza ukuhlakazeka okuzinzile kwamaconsi acolekileyo phakathi kotshwala nesiraphu yeglucose.
Inqubo ye-transacetalization yezigaba ezimbili idinga imishini eminingi kunokuhlanganiswa okuqondile. Esigabeni sokuqala, i-carbohydrate isabela ngotshwala obunamaketanga amafushane (isibonelo i-n-butanol noma i-propylene glycol) futhi uma uthanda u-deploy-menzes. Esigabeni sesibili, i-alkyl glycoside ye-short-chain is transacetalized ngotshwala olude kakhulu ukuze kwakhe i-alkyl polyglycoside edingekayo. Uma isilinganiso se-molar ye-carbohydrate notshwala sifana, ukusatshalaliswa kwe-oligomer okutholakala ohlelweni lwe-transacetalization ngokuyisisekelo kufana nalokho okutholwe ekuhlanganiseni okuqondile.
Uma kusetshenziswa i-oligo-ne-polyglycoses (isibonelo isitashi, amasyrups anenani eliphansi le-DE) kusetshenziswa inqubo ye-transacetalization. I-depolymerization edingekayo yalezi zinto zokuqala idinga izinga lokushisa elingaphezu kuka-140 ℃. Kusekelwe otshwaleni obusetshenzisiwe, lokhu kungadala izingcindezi eziphakeme ngokuhambisanayo ezibeka izimfuno eziqinile kumishini futhi kungaholela ezindlekweni eziphakeme zezitshalo. Ngokuvamile, ngomthamo ofanayo, ukukhiqizwa kwenqubo ye-transacetalization kubiza ngaphezu kokuhlanganiswa okuqondile. ngaphezu kwezigaba ezimbili zokusabela, izinsiza ezengeziwe zokulondoloza kufanele zinikezwe, kanye nezindawo zokusebenza ozikhethela kuzo utshwala obuyi-short-chain. Ngenxa yokungcola okukhethekile kwesitashi (njengamaprotheni), i-alkyl glycosides kufanele icwengwe okwengeziwe noma kakhudlwana. Enqubweni ye-transacetalization eyenziwe lula, ama-syrups anokuqukethwe kwe-glucose ephezulu (DE>96%) noma izinhlobo ze-glucose eqinile zingasabela nge-alcohol ye-short-chain ngaphansi kwengcindezi evamile, izinqubo ziyaqhubeka zakhiwe ngalesi sisekelo. (Umfanekiso 3 ukhombisa yomibili imizila yokwenziwa kwama-alkyl polyglycosides)
Umfanekiso 3. Alkyl polyglycoside surfactants-industrial synthesis pathways


Isikhathi sokuthumela: Sep-29-2020