GB514342A - Improvements in the manufacture of polyhydric alcohols - Google Patents
Improvements in the manufacture of polyhydric alcoholsInfo
- Publication number
- GB514342A GB514342A GB1321538A GB1321538A GB514342A GB 514342 A GB514342 A GB 514342A GB 1321538 A GB1321538 A GB 1321538A GB 1321538 A GB1321538 A GB 1321538A GB 514342 A GB514342 A GB 514342A
- Authority
- GB
- United Kingdom
- Prior art keywords
- hydrogenation
- formaldehyde
- methanol
- treated
- polyhydric alcohols
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
514,342. Polyhydric alcohols. TAYLOR, A. W. C., WOOLCOCK, J. W., HELLICAR, A. G., and IMPERIAL CHEMICAL INDUSTRIES, Ltd. May 3, 1938, Nos. 13215 and 15378. Drawings to Specification. [Class 2 (iii)] In the production of polyhydric alcohols by hydrogenation of mixtures of hydroxyaldehydes and hydroxy-ketones obtained by the condensation of formaldehyde in the presence of a catalyst and of methanol as diluent, the remaining formaldehyde and preferably also the methanol are removed previous to the hydrogenation, the formaldehyde being removed by conversion into methylal which is then distilled off, or by distillation in the presence of methyl and/or ethyl alcohol. This purification reduced the consumption of catalyst in the hydrogenation. The hydroxy-aldehyde and hydroxyketone mixture may be treated to remove water, and then treated with methanol in excess and 5-10 per cent. sulphuric acid for the production of methylal which is then distilled off after neutralizing the acid. The remaining mixture is treated with centinormal sulphuric acid to hydrolyze acetals and, after removal of the acid as calcium sulphate, is suitable for hydrogenation. Alternatively, the initial mixture may be supplied at the top of a stripping column and a stream of methyl or ethyl alcohol as vapour or liquid is supplied at the bottom, whereby the formaldehyde is removed together with water and alcohol. The hydrogenation may be effected with activated nickel, which may be on a carrier, at 40-50 atmospheres and 120-150‹C. Specification 309,200, [Class 2 (iii)], and 513,708 are referred to.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1321538A GB514342A (en) | 1938-05-03 | 1938-05-03 | Improvements in the manufacture of polyhydric alcohols |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1321538A GB514342A (en) | 1938-05-03 | 1938-05-03 | Improvements in the manufacture of polyhydric alcohols |
Publications (1)
Publication Number | Publication Date |
---|---|
GB514342A true GB514342A (en) | 1939-11-06 |
Family
ID=10018914
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1321538A Expired GB514342A (en) | 1938-05-03 | 1938-05-03 | Improvements in the manufacture of polyhydric alcohols |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB514342A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2467451A (en) * | 1944-10-09 | 1949-04-19 | Celanese Corp | Manufacture of cyclic aliphatic dihydroxy compounds |
US2775621A (en) * | 1952-06-20 | 1956-12-25 | Celanese Corp | Hydrogenation of formaldehyde condensation products |
US4608446A (en) * | 1977-12-16 | 1986-08-26 | Bayer Aktiengesellschaft | Process for the preparation of low molecular weight polyhydroxyl compounds |
WO2008074566A1 (en) * | 2006-12-20 | 2008-06-26 | Symrise Gmbh & Co. Kg | A tropolone purification process, purified tropolone and uses thereof |
-
1938
- 1938-05-03 GB GB1321538A patent/GB514342A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2467451A (en) * | 1944-10-09 | 1949-04-19 | Celanese Corp | Manufacture of cyclic aliphatic dihydroxy compounds |
US2775621A (en) * | 1952-06-20 | 1956-12-25 | Celanese Corp | Hydrogenation of formaldehyde condensation products |
US4608446A (en) * | 1977-12-16 | 1986-08-26 | Bayer Aktiengesellschaft | Process for the preparation of low molecular weight polyhydroxyl compounds |
WO2008074566A1 (en) * | 2006-12-20 | 2008-06-26 | Symrise Gmbh & Co. Kg | A tropolone purification process, purified tropolone and uses thereof |
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