摘要:
The process for the chromatographic fractionation of whey comprising passing whey through a column of an ion exchange material, thereafter passing water through said column as eluant, and collecting the aqueous effluent from said column as a plurality of fractions. Advantageously the ion exchange material is a polystyrene resin containing sulfonic acid groups neutralized with calcium ions and cross-linked with about 2 to 4% by weight of divinyl-benzene, and the eluant is demineralized water.
摘要:
The present invention provides a process for the preparation of 5-(4'-chloro-5'-sulfamoyl-2'-thenylamino)-phenyltetrazole by condensing 5-(4'-chloro-5'-sulfamoyl-2'-aminophenyl)-tetrazole with thiophene-2-aldehyde in the presence of an acid catalyst and reducing the 5-[4'-chloro-5'-sulfamoyl-2'-(thenylidene-2-amino)-phenyl]tetrazole so obtained with a boranate, wherein the condensation is carried out in dimethyl sulfoxide as solvent, with azeotropic distilling off of the water formed and the reduction is carried out in the same medium, without isolation of the 5-[4'-chloro-5'-sulfamoyl-2'-(thenylidene-2-amino)-phenyl]-tetrazole.
摘要:
The present invention provides a process for the preparation of 1,4:3,6-dianhydro-D-glucitol-5-nitrate, in which(a) 1,4:3,6-dianhydro-D-glucitol is acetylated with 0.5 to 1.5 mole equivalents of acetic anhydride in the presence of a catalyst, a mixture of 1,4:3,6-dianhydro-D-glucitol-2-acetate, 1,4:3,6-dianhydro-D-glucitol-5-acetate and 1,4:3,6-dianhydro-D-glucitol-2,5-diacetate being obtained;(b) the mixture is nitrated with nitric acid, a mixture of 1,4:3,6-dianhydro-D-glucitol-2-acetate-5-nitrate and 1,4:3,6-dianhydro-D-glucitol-5-acetate-2-nitrate being obtained; and(c) hydrolysis is carried out with an inorganic base to give 1,4:3,6-dianhydro-D-glucitol-5-nitrate;wherein, in step (a), the reaction is carried out in the presence of a basic catalyst and the 1,4:3,6-dianhydro-D-glucitol-2,5-diacetate is substantially removed before further working up.
摘要:
The present invention provides a process for the preparation of 4-hydroxycarbazole by the dehydration of 1,2,3,4-tetrahydro-4-oxocarbazole, wherein the reaction is carried out in aqueous alkaline solution, using Raney nickel as catalyst.