Txoj kev npaj ntawm erythritol

Kev tsim cov erythritol tuaj yeem muab faib ua ob txoj hauv kev: microbial fermentation thiab tshuaj synthesis.
Txoj kev fermentation microbial
Txoj kev fermentation rau kev tsim erythritol tau pib hauv xyoo 1990 thiab tau siv dav thoob ntiaj teb rau kev tsim ntau ntawm erythritol. Cov pa roj carbon monoxide tsim erythritol suav nrog alkanes, monosaccharides, thiab disaccharides. Glucose, fructose, mannose, thiab sucrose yog cov pa roj carbon zoo rau kev tsim erythritol, nrog D-mannose muaj qhov hloov pauv siab tshaj plaws, mus txog 31.5 feem pua. Txawm li cas los xij, vim yog tus nqi tseem ceeb, nws tsuas yog siv cov hmoov txhuv nplej siab xws li nplej los yog pob kws los tsim cov piam thaj los ntawm kev degradation enzymatic, uas yog fermented los ntawm high permeability resistant poov xab los yog lwm yam hom. Erythritol tuaj yeem tsim los ntawm Candida, Saccharomyces bulgaricus, Trichosporomyces, Saccharomyces triangularis, Pichia Saccharomyces, thiab lwm yam. Cov txheej txheem tsim khoom ntawm erythritol fermentation txoj kev yog raws li hauv qab no: hmoov txhuv nplej siab → liquefaction → saccharification → saccharification → saccharification → saccharification kev sib cais → purification → concentration → crystallization → sib cais → ziab, thaum kawg tau erythritol nrog qhov nruab nrab tawm los ntawm 50 feem pua. Kev tshawb fawb qhia tau hais tias erythritol fermentation txoj kev cuam tshuam los ntawm ntau yam, xws li kev hloov pauv ntawm osmotic siab cuam tshuam rau kev tsim ntawm polyols, inorganic ntsev Mn2 ntxiv thiab Cu2 ntxiv tuaj yeem txhim kho cov txiaj ntsig ntawm erythritol, thiab oxygen thiab kub cuam tshuam rau nws cov txiaj ntsig. . Piv nrog rau cov tshuaj synthesis, txoj kev fermentation muaj ntau qhov zoo hauv kev tsim khoom.
Cov txheej txheem tshuaj synthesis
Cov txheej txheem tshuaj synthesis tuaj yeem ua tiav los ntawm reacting butene glycol nrog hydrogen peroxide, tom qab ntawd sib tov nws cov tshuaj aqueous nrog cov nickel active catalyst thiab ntxiv cov inhibitor ammonia dej. Hydrogen gas yog qhia nyob ib ncig ntawm 0.5MPa thiab hydrogenated kom tau erythritol cov khoom. Txawm li cas los xij, qhov kev ua tau zoo ntawm cov txheej txheem tshuaj muaj tsawg thiab kev tsim khoom lag luam tseem tsis tau ua tiav.