Continuous process for the production of d,l'menthol

Details Continuous process for the production of d,l'menthol Continuous process for the production of d,l'menthol

1975-10-20

1977-11-15

Thomas, Jr., James O.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

252471, C07C 2704, C07C 3512

Patent

active

040585719

ABSTRACT:
Continuous process for production of d,l, menthol by hydrogenation of thymol or other compound having the carbon skeleton of menthol and which is substituted by oxygen (oxygen or hydroxy) in the 4-position. A cobalt-manganese catalyst is used which contains 10 to 40% by weight of manganese based on the total quantity of oxidic cobalt and oxidic manganese. High conversion are obtained and the built up of by-products is low. The catalyst is similarly effective for rearrangement of isomers of menthol to product d,l-menthol.

REFERENCES:
patent: 2843636 (1958-07-01), Booth
patent: 2866826 (1958-12-01), McLaughlin et al.
patent: 3405185 (1968-10-01), Houlihan et al.
patent: 3558703 (1971-01-01), Adam et al.
Leffingwell et al., Synthesis of L-menthol from a Citrus by-product, pp. 1-14, (1973).

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