GB297083A - Improvements in or relating to the manufacture of pure m- and p-cresols - Google Patents

Improvements in or relating to the manufacture of pure m- and p-cresols

Info

Publication number
GB297083A
GB297083A GB24861/28A GB2486128A GB297083A GB 297083 A GB297083 A GB 297083A GB 24861/28 A GB24861/28 A GB 24861/28A GB 2486128 A GB2486128 A GB 2486128A GB 297083 A GB297083 A GB 297083A
Authority
GB
United Kingdom
Prior art keywords
cresol
urea
decomposed
crystals
separated
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
GB24861/28A
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.)
Schering Kahlbaum AG
Original Assignee
Schering Kahlbaum AG
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 Schering Kahlbaum AG filed Critical Schering Kahlbaum AG
Publication of GB297083A publication Critical patent/GB297083A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C37/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom of a six-membered aromatic ring
    • C07C37/68—Purification; separation; Use of additives, e.g. for stabilisation
    • C07C37/86—Purification; separation; Use of additives, e.g. for stabilisation by treatment giving rise to a chemical modification

Landscapes

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

Abstract

297,083. Scheriag-Kahlbaum Akt.- Ges. Sept. 14, 1927, [Convention date]. m-Cresol is separated from mixtures, particularly its mixture with p-cresol by treatment with urea to form an addition compound with mcresol which is separated in crystalline form and decomposed, for instance, by distillation, if desired under reduced pressure, steam distillation, or treatment with water or acids. The separation of the m-cresol-urea crystals may be effected in presence of solvents such as certain tetrachloride or urea solution. From the mother-liquor pcresol may be obtained pure by fractional crystallization. The Specification, as open to inspection under Sect. 91 (3) (a) states that the m-cresol-urea compound may be decomposed by solutions of magnesium or sodium sulphate or calcium chloride, any urea remaining in the m-cresol being decomposed by hydrolysis. In an example, the m-cresolurea compound is formed from a crude cresol and urea at a temperature which is reduced in several hours from 40‹ C. to -10‹ C. The crystals are washed with solvents, such as carbon tetrachloride, or xylol, or with cold urea solution, and the m-cresol is recovered as described above. The cresol separated from the urea-m-cresol crystals is freed from urea as described above and distilled to obtain pure p-cresol. This subjectmatter does not appear in the Specification as accepted.
GB24861/28A 1927-09-14 1928-08-29 Improvements in or relating to the manufacture of pure m- and p-cresols Expired GB297083A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE297083X 1927-09-14

Publications (1)

Publication Number Publication Date
GB297083A true GB297083A (en) 1929-09-05

Family

ID=6090574

Family Applications (1)

Application Number Title Priority Date Filing Date
GB24861/28A Expired GB297083A (en) 1927-09-14 1928-08-29 Improvements in or relating to the manufacture of pure m- and p-cresols

Country Status (1)

Country Link
GB (1) GB297083A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE943886C (en) * 1951-05-26 1956-06-01 Hoechst Ag Process for purifying m-cresol

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE943886C (en) * 1951-05-26 1956-06-01 Hoechst Ag Process for purifying m-cresol

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