GB189450A - A process for the production of inactive menthol - Google Patents
A process for the production of inactive mentholInfo
- Publication number
- GB189450A GB189450A GB31714/22A GB3171422A GB189450A GB 189450 A GB189450 A GB 189450A GB 31714/22 A GB31714/22 A GB 31714/22A GB 3171422 A GB3171422 A GB 3171422A GB 189450 A GB189450 A GB 189450A
- Authority
- GB
- United Kingdom
- Prior art keywords
- menthol
- thymol
- catalyst
- nickel
- isomenthol
- 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
- C07C35/00—Compounds having at least one hydroxy or O-metal group bound to a carbon atom of a ring other than a six-membered aromatic ring
- C07C35/02—Compounds having at least one hydroxy or O-metal group bound to a carbon atom of a ring other than a six-membered aromatic ring monocyclic
- C07C35/08—Compounds having at least one hydroxy or O-metal group bound to a carbon atom of a ring other than a six-membered aromatic ring monocyclic containing a six-membered rings
- C07C35/12—Menthol
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Catalysts (AREA)
Abstract
By hydrogenizing thymol under pressure of about 5-30 atmospheres in the presence of a catalyst such as nickel, cobalt, platinum, or palladium, a mixture of menthol and isomenthol is obtained, from which the menthol separates on cooling. The isomenthol remaining is dehydrogenized into menthone by the aid of a catalyst such as copper oxide or nickel oxide, and the menthone, alone or in admixture with thymol, is then hydrogenized under pressure to produce more menthol. The menthol obtained by the process has the properties of natural inactive menthol. According to the example, thymol is heated in an autoclave with hydrogen and nickel, the catalyst then removed, and the menthol isolated by cooling and centrifuging; the liquid isomenthol remaining is next heated with copper oxide to which an alkali has preferably been added, and the resulting menthone finally treated-either alone or mixed with thymol-with hydrogen in the presence of a nickel catalyst, the product being dealt with as before.ALSO:By hydrogenizing thymol under pressure in the presence of a catalyst such as nickel, cobalt, platinum or palladium, a mixture of menthol and isomenthol is obtained, from which the menthol separates on cooling. The isomenthol remaining is dehydrogenized into menthone by the aid of a catalyst such as copper oxide or nickel oxide, and the menthone, alone or in admixture with thymol, is then hydrogenized under pressure to produce more menthol. The menthol obtained by the process has the properties of natural inactive menthol. According to the example, thymol is heated in an autoclave with hydrogen and nickel, the catalyst then removed, and the menthol isolated by cooling and centrifuging; the liquid isomenthol remaining is next heated with copper oxide to which an alkali has preferably been added, and the resulting menthone finally treated-either alone or mixed with thymol-with hydrogen in the presence of a nickel catalyst, the product being dealt with as before.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE189450X | 1921-11-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB189450A true GB189450A (en) | 1923-05-31 |
Family
ID=5721327
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB31714/22A Expired GB189450A (en) | 1921-11-23 | 1922-11-20 | A process for the production of inactive menthol |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB189450A (en) |
-
1922
- 1922-11-20 GB GB31714/22A patent/GB189450A/en not_active Expired
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