GB675527A - A process for the catalytic reduction of sugars - Google Patents
A process for the catalytic reduction of sugarsInfo
- Publication number
- GB675527A GB675527A GB29894/49A GB2989449A GB675527A GB 675527 A GB675527 A GB 675527A GB 29894/49 A GB29894/49 A GB 29894/49A GB 2989449 A GB2989449 A GB 2989449A GB 675527 A GB675527 A GB 675527A
- Authority
- GB
- United Kingdom
- Prior art keywords
- hydrogen
- added
- aqueous solution
- mixture
- reaction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C31/00—Saturated compounds having hydroxy or O-metal groups bound to acyclic carbon atoms
- C07C31/18—Polyhydroxylic acyclic alcohols
- C07C31/26—Hexahydroxylic alcohols
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Sugar alcohols are obtained by reacting an aqueous solution of an optically active monosaccharide with hydrogen at substantially normal atmospheric pressure in the presence of a hydrogenation catalyst containing metallic nickel. The reduction may be effected at room temperature and in neutral, acid, or alkaline solution. The reaction is accelerated by increasing the temperature or the amount of catalyst and by adding methyl or ethyl alcohol. In examples: (1) Raney nickel is added to an aqueous solution of glucose and the air driven out by passing hydrogen through the reaction vessel. When the escaping hydrogen is pure the discharge cock is closed and the vessel agitated, the hydrogen being absorbed to form sorbitol; (2) as in (1) except that 25 per cent ammonia is added to the reaction mixture, a mixture of mannitol and sorbitol being obtained. The Specification as open to inspection under Sect. 91 includes two additional examples in which (1) an aqueous solution of commercial glucose containing Raney nickel as catalyst and to which a small amount of a base, e.g. calcium hydroxide is added at intervals to maintain a pH of 9 to 9.5, is treated with hydrogen to yield sorbitol; (2) mannitol is obtained by treating an aqueous solution of fructose with hydrogen in the presence of Raney nickel, pulverized magnesium being added to the mixture to neutralize the organic acids produced in the reaction; (3) wood sugar wort evaporated to about 25 per cent and purified is brought to a pH value of 9.5 with soda lye and then filtered. An alcoholic suspension of nickel-kieselguhr catalyst is then added and the mixture treated with hydrogen to yield a syrup. This subject-matter does not appear in the Specification as accepted.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH675527X | 1948-11-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB675527A true GB675527A (en) | 1952-07-09 |
Family
ID=4528059
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB29894/49A Expired GB675527A (en) | 1948-11-29 | 1949-11-22 | A process for the catalytic reduction of sugars |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB675527A (en) |
-
1949
- 1949-11-22 GB GB29894/49A patent/GB675527A/en not_active Expired
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