GB346288A - Improvements in the hydration of acetylene - Google Patents
Improvements in the hydration of acetyleneInfo
- Publication number
- GB346288A GB346288A GB46130A GB46130A GB346288A GB 346288 A GB346288 A GB 346288A GB 46130 A GB46130 A GB 46130A GB 46130 A GB46130 A GB 46130A GB 346288 A GB346288 A GB 346288A
- Authority
- GB
- United Kingdom
- Prior art keywords
- crotonaldehyde
- acetaldehyde
- parts
- acetylene
- ratio
- 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
- Catalysts (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
A catalyst for the preparation of acetaldehyde and crotonaldehyde from acetylene and steam is prepared from cadmium oxide and phosphoric acid. In the example, 128 parts of cadmium oxide are dissolved in an aqueous solution of 98 parts of orthophosphoric acid. The solution is evaporated to dryness, and the product dried and pelleted.ALSO:Acetaldehyde; crotonaldehyde; catalytic agents' preparation and treatment of.-Acetylene and steam' preferably in the ratio of 1 : 3, are passed at elevated temperature, e.g. 300-400 DEG C., over a chemical compound containing cadmium, phosphorus, and oxygen, with or without hydrogen. Suitable starting materials for the preparation of the catalyst are cadmium oxide and phosphoric acid. Usually the main products are acetaldehyde and crotonaldehyde, but small amounts of acetic acid, methane, and oxides of carbon may be obtained. The ratio of the acetaldehyde to the crotonaldehyde produced depends on the exact composition of the cadmium phosphate employed. If the ratio of the number of molecular proportions of phosphoric anhydride (P2O5) to the number of molecular proportions of cadmium oxide in the compound is below 0,4 or above 0,6, only very small quantities of crotonaldehyde are obtained, while at a ratio of 0,47 the yield of crotonaldehyde rises to a maximum. The total conversion of acetylene to acetaldehyde and crotonaldehyde also reaches a maximum at the same ratio of 0,47. In the example, 128 parts of cadmium oxide are dissolved in an aqueous solution of 98 parts of orthophosphoric acid; the solution is evaporated to dryness, and the product dried and pelleted. Over this catalyst a mixture of 3 volumes of steam and 1 volume of acetylene is passed at a temperature of 350 DEG C. and a space velocity of 100 reciprocal hours. The reaction gases are cooled, and the condensate distilled, yielding 2 parts of acetaldehyde to 1 of crotonaldehyde. Specifications 154,579, 320,362, and 332,635, [all in Class 2 (iii), Dyes &c.], are referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB46130A GB346288A (en) | 1930-01-06 | 1930-01-06 | Improvements in the hydration of acetylene |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB46130A GB346288A (en) | 1930-01-06 | 1930-01-06 | Improvements in the hydration of acetylene |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB346288A true GB346288A (en) | 1931-04-07 |
Family
ID=9704750
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB46130A Expired GB346288A (en) | 1930-01-06 | 1930-01-06 | Improvements in the hydration of acetylene |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB346288A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE963240C (en) * | 1948-10-02 | 1957-05-02 | Dr Gerhard Hoffmann | Process for the production of acetaldehyde by passing acetylene or acetylene-containing gas mixtures and water vapor over catalysts |
| US2847476A (en) * | 1953-03-27 | 1958-08-12 | Escambia Chem Corp | Hydration of acetylene using cadmium pyrophosphate catalyst |
-
1930
- 1930-01-06 GB GB46130A patent/GB346288A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE963240C (en) * | 1948-10-02 | 1957-05-02 | Dr Gerhard Hoffmann | Process for the production of acetaldehyde by passing acetylene or acetylene-containing gas mixtures and water vapor over catalysts |
| US2847476A (en) * | 1953-03-27 | 1958-08-12 | Escambia Chem Corp | Hydration of acetylene using cadmium pyrophosphate catalyst |
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