GB297019A - Improvements relating to the manufacture of crystalline menthol - Google Patents

Improvements relating to the manufacture of crystalline menthol

Info

Publication number
GB297019A
GB297019A GB1529427A GB1529427A GB297019A GB 297019 A GB297019 A GB 297019A GB 1529427 A GB1529427 A GB 1529427A GB 1529427 A GB1529427 A GB 1529427A GB 297019 A GB297019 A GB 297019A
Authority
GB
United Kingdom
Prior art keywords
menthol
point
esterification
melting
saponifying
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
Application number
GB1529427A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tronox Pigment UK Ltd
Original Assignee
Cristal Pigment UK Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Cristal Pigment UK Ltd filed Critical Cristal Pigment UK Ltd
Priority to GB1529427A priority Critical patent/GB297019A/en
Publication of GB297019A publication Critical patent/GB297019A/en
Expired legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C35/00Compounds having at least one hydroxy or O-metal group bound to a carbon atom of a ring other than a six-membered aromatic ring
    • C07C35/02Compounds 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
    • C07C35/08Compounds 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
    • C07C35/12Menthol

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

297,019. Howards & Sons, Ltd., and Blagden, J. W. June 8, 1927. Menthol.-By subjecting synthetic menthol to partial esterification, separating the unesterified from the esterified portion, and saponifying the latter, the parent material is divided into fractions of different melting-point of which one is of higher melting-point than that of the starting material. A similar result is obtained by partially saponifying a menthol ester, separating the liberated menthol from the unsaponified ester, and saponifying the latter. The partial saponification and esterification may be effected in two or more stages, and both may be combined. The process is applicable both to crystalline menthol of melting-point about 34‹ C. and to crude synthetic menthol of lower melting-point; menthol prepared by the hydrogenation of thymol, piperitone and menthone, and particularly that prepared according to Specification 213,991 and 238,314, is specially mentioned. At other stages of the partial saponification or esterification, there may be produced a crystalline menthol of lower melting-point or a liquid menthol, and these may be again treated, together if desired with a further quantity of parent menthol; alternatively, they may be treated by the processes described in the aforementioned Specifications. The esterification may be effected with aliphatic or aromatic acids or anhydrides; when the acid is polybasic, e.g. phthalic acid, either a normal or an acid ester may be formed. The saponification is carried out by treatment with caustic alkali, but in the case of an acid ester steam distillation may also be employed. Examples are given.
GB1529427A 1927-06-08 1927-06-08 Improvements relating to the manufacture of crystalline menthol Expired GB297019A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1529427A GB297019A (en) 1927-06-08 1927-06-08 Improvements relating to the manufacture of crystalline menthol

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1529427A GB297019A (en) 1927-06-08 1927-06-08 Improvements relating to the manufacture of crystalline menthol

Publications (1)

Publication Number Publication Date
GB297019A true GB297019A (en) 1928-09-10

Family

ID=10056505

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1529427A Expired GB297019A (en) 1927-06-08 1927-06-08 Improvements relating to the manufacture of crystalline menthol

Country Status (1)

Country Link
GB (1) GB297019A (en)

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