GB283112A - Improvements in process for the manufacture of acetal - Google Patents
Improvements in process for the manufacture of acetalInfo
- Publication number
- GB283112A GB283112A GB35223/27A GB3522327A GB283112A GB 283112 A GB283112 A GB 283112A GB 35223/27 A GB35223/27 A GB 35223/27A GB 3522327 A GB3522327 A GB 3522327A GB 283112 A GB283112 A GB 283112A
- Authority
- GB
- United Kingdom
- Prior art keywords
- alcohol
- pipe
- still
- acetal
- acetaldehyde
- 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
- C07C41/00—Preparation of ethers; Preparation of compounds having groups, groups or groups
- C07C41/48—Preparation of compounds having groups
- C07C41/50—Preparation of compounds having groups by reactions producing groups
- C07C41/56—Preparation of compounds having groups by reactions producing groups by condensation of aldehydes, paraformaldehyde, or ketones
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C41/00—Preparation of ethers; Preparation of compounds having groups, groups or groups
- C07C41/48—Preparation of compounds having groups
- C07C41/58—Separation; Purification; Stabilisation; Use of additives
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
283,112. Soc. Anon. des Distilleries des Deux-SÞvrÚs. Jan. 3, 1927, [Convention date]. Acetal.-In the production of acetal by treating alcohol and acetaldehyde with a catalyst such as hydrochloric, sulphuric, toluene-sulphonic, or acetic acid, hydrogen phosphide, calcium chloride or certain metallic salts, the reaction mixture is treated to remove first the acetaldehyde with part of the alcohol, then the alcohol and water by means of an insoluble liquid forming an azeotropic mixture, leaving the acetal behind, and the aceotropic mixture is then treated to recover the auxiliary liquid and the alcohol. The process is described with the use of an acid catalyst (hydrochloric acid), and when the reaction is finished the acid is neutralized by sodium bicarbonate until a slight alkalinity is shown by bromo-thymol blue prior to distillation. In an example, 45 grs. of gaseous hydrochloric acid (used as a solution of 22‹ B.) is employed with 92 kilos of alcohol and 46 kilos of acetaldehyde. The reagents are placed in a reaction vessel having a cooling-coil 2, and the neutralized product is discharged to, a vessel 3, from which it is fed continuously to a still 4, which is arranged so that the free acetaldehyde, possibly with some alcohol, is distilled over and caught in a condenser 6 from which part is returned to the still 4 by a pipe 7 and the rest is collected in a tank 8 for use again. At the bottom of the still 4 the acetal collects with some alcohol, and the sodium chloride separates and is removed at 11. The liquor from the bottom of the still 4 is vaporized and taken by a pipe 9 to a still 10 which contains some benzene distributed over its upper part. An azeotropic mixture of benzene, alcohol, and water escapes to a condenser 12, from which a part is returned to the still 10 and the rest goes by a pipe 14 to a washing-column 15, to which water is supplied by a pipe 18. The acetal collects in the lower part of the still 10 and is withdrawn by a pipe 16 to a cooler 17. The benzene separates in the column 15 and returns to the still 10 by a pipe 19, and the diluted alcohol passes from the bottom of the column 15 by a pipe 20 to a still 21. from which concentrated alcohol is delivered by a pipe 22 to a tank 23, the residual water being discharged by a pipe 24. The Specification as open to inspection under Sect. 91 (3) (a) states that the condensation is effected with from one-fifth to one-tenth of the quantity of catalyst employed in the known processes. This subject-matter does not appear in the Specification as accepted.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE283112X | 1927-01-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB283112A true GB283112A (en) | 1928-11-15 |
Family
ID=3867109
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB35223/27A Expired GB283112A (en) | 1927-01-03 | 1927-12-29 | Improvements in process for the manufacture of acetal |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB283112A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2491915A (en) * | 1946-06-07 | 1949-12-20 | Du Pont | Process for the preparation of acetals |
US2678950A (en) * | 1954-05-18 | Process of producing acrolein | ||
US4418217A (en) * | 1980-05-12 | 1983-11-29 | Henkel Kommanditgesellschaft Auf Aktien | Mixed formals of polyglycol ethers |
-
1927
- 1927-12-29 GB GB35223/27A patent/GB283112A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2678950A (en) * | 1954-05-18 | Process of producing acrolein | ||
US2491915A (en) * | 1946-06-07 | 1949-12-20 | Du Pont | Process for the preparation of acetals |
US4418217A (en) * | 1980-05-12 | 1983-11-29 | Henkel Kommanditgesellschaft Auf Aktien | Mixed formals of polyglycol ethers |
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