GB818160A - Crystalline hydrated glyoxal and its preparation - Google Patents
Crystalline hydrated glyoxal and its preparationInfo
- Publication number
- GB818160A GB818160A GB16826/56A GB1682656A GB818160A GB 818160 A GB818160 A GB 818160A GB 16826/56 A GB16826/56 A GB 16826/56A GB 1682656 A GB1682656 A GB 1682656A GB 818160 A GB818160 A GB 818160A
- Authority
- GB
- United Kingdom
- Prior art keywords
- glyoxal
- hydrate
- preparation
- cho
- crystals
- 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
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention comprises a crystalline non-hygroscopic product having the composition of a glyoxal hydrate of the formula 3(CHO.CHO).2H2O and its preparation by subjecting an aqueous solution of glyoxal, having a glyoxal content in excess of 30 per cent by weight, to a temperature of 35-45 DEG C. and thereafter allowing the desired product to crystallize in the solution at a temperature lower than that of the heating. The crystalline hydrate, which may be a tetrahydroxy naphthodioxane, on dissolution in water yields pure aqueous glyoxal solutions. In an example, a 60 per cent aqueous glyoxal solution containing some acetic acid, glyoxylic acid and glycollic acid as impurities, is maintained at 40 DEG C. for 4 days; it is then inoculated with some crystals of hydrate from a previous operation and maintained at 15-20 DEG C. until a paste of crystals has formed; the mixture is filtered and the mother liquor concentrated down for use in a further operation. U.S.A. Specification 2,379,555 is referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR818160X | 1955-06-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB818160A true GB818160A (en) | 1959-08-12 |
Family
ID=9268726
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB16826/56A Expired GB818160A (en) | 1955-06-10 | 1956-05-31 | Crystalline hydrated glyoxal and its preparation |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB818160A (en) |
-
1956
- 1956-05-31 GB GB16826/56A patent/GB818160A/en not_active Expired
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