A process for the production of alcohols

摘要

In the production of alcohols from olefines and sulphuric acid, the alcohol-water mixture obtained is completely or substantially dried for instance by copper sulphate, lime or calcium chloride or by azeotropic distillation with toluene, xylene, ethylene chloride, benzine fractions or the like, before the final distillation, which is then effective for separating the alcohol from unpleasant-smelling polymers. In examples (1) the crude aqueous isopropyl alcohol is concentrated to 88 per cent strength by azeotropic distillation, dried with anhydrous copper sulphate and fractionally distilled; it is stated that if potash were used for the drying, the final distillation would not remove the polymers; (2) the same crude isopropyl alcohol is dehydrated by distillation with toluene with return of the toluene layer of the condensate, and is then fractionally distilled. Specification 334,228, [Class 2 (iii), Dyes &c.], is referred to.ALSO:In the production of alcohols from olefines and sulphuric acid, the alcohol-water mixture obtained is completely or substantially dried for instance by copper sulphate, lime or calcium chloride or by azeotropic distillation with toluene, xylene, ethylene chloride, benzine fractions or the like, before the final distillation, which is then effective for separating the alcohol from unpleasant-smelling polymers. In examples (1) crude aqueous isopropyl alcohol is concentrated to 88 per cent strength by azeotropic distillation, dried with anhydrous copper sulphate and fractionally distilled ; it is stated that if potash were used for the drying, the final distillation would not remove the polymers ; (2) the same crude isopropyl alcohol is dehydrated by distillation with toluene with return of the toluene layer of the condensate, and is then fractionally distilled. Specification 334,228, [Class 2 (iii), Dyes &c.], is referred to.