GB404975A - Improvements relating to the production of penta-erythrite - Google Patents
Improvements relating to the production of penta-erythriteInfo
- Publication number
- GB404975A GB404975A GB17534/32A GB1753432A GB404975A GB 404975 A GB404975 A GB 404975A GB 17534/32 A GB17534/32 A GB 17534/32A GB 1753432 A GB1753432 A GB 1753432A GB 404975 A GB404975 A GB 404975A
- Authority
- GB
- United Kingdom
- Prior art keywords
- alkaline
- interrupted
- condensation
- temperature
- erythrite
- 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
- C07C31/24—Tetrahydroxylic alcohols, e.g. pentaerythritol
- C07C31/245—Pentaerythritol
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
In the preparation of penta-erythrite by the alkaline condensation of formaldehyde with acetaldehyde, the reaction is interrupted just before the point at which there is a minimum of reducing substances present, thereby securing the maximum yield. Test samples are taken at intervals and the amount of reducing substances present, viz. unreacted aldehydes and intermediate or bye-products of reducing character, is estimated by titration with Fehling's solution or silver hydroxide solution or electrometrically. When the minimum is approached, the condensation, which has been proceeding at a temperature below 60 DEG C., is interrupted by lowering the temperature to below 20 DEG C. and by removing or neutralising the alkaline condensing agent. If desired, the condensation may first be slowed down by lowering the temperature and then interrupted by elimination of the alkaline agent. In a modification of the process, smaller amounts of the alkaline agents are employed than the equivalent quantity, e.g. 85--90 per cent of the calculated amount. The process may be operated continuously or discontinuously, and an apparatus is described for the continuous operation. Examples are given, in which caustic soda and lime are employed as the alkaline agent and yields of nearly 80 per cent of the theoretical are obtained.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE404975X | 1932-04-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB404975A true GB404975A (en) | 1934-01-22 |
Family
ID=6421866
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB17534/32A Expired GB404975A (en) | 1932-04-20 | 1932-06-21 | Improvements relating to the production of penta-erythrite |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB404975A (en) |
-
1932
- 1932-06-21 GB GB17534/32A patent/GB404975A/en not_active Expired
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