Title:
イソピマル酸製造プロセス
Document Type and Number:
Japanese Patent JP5478796
Kind Code:
B2
Abstract:
Disclosed is a process for preparing isopimaric acid, comprising the following steps: First step: dissolving thermally isomerized rosin in acetone, adding in drops a solution of isobutanolamine in acetone to form a precipitate, standing, filtering, washing with ethanol, and drying to obtain crude ammonium salt of isopimaric acid; recrystallizing the crude ammonium salt of isopimaric acid according to multi-recrystallization, and drying to obtain purified crystal of ammonium salt of isopimaric acid; Second step: dissolving the purified crystal of ammonium salt of isopimaric acid obtained in the first step in ether, adding hydrochloric acid in portions until the crystal of ammonium salt of isopimaric acid disappears, removing a water layer and washing the ether layer with water to neutral, evaporating the ether, dissolving the residue in acetone, adding water slowly into the solution dropwise until crystals cease to grow, then filtering and drying to obtain purified isopimaric acid.
Inventors:
Zhao Swing East
Lee Xing
Akira Yoshitake
Chen Tamasho
Koken
Lee Fumei
King son-in-law
Lee Xing
Akira Yoshitake
Chen Tamasho
Koken
Lee Fumei
King son-in-law
Application Number:
JP2011511964A
Publication Date:
April 23, 2014
Filing Date:
June 05, 2009
Export Citation:
Assignee:
China Forest Industry Science Research Institute Industry Chemical Engineering Industry Research Institute
International Classes:
C07C51/487; C07C51/353; C07C51/43; C07C61/35
Domestic Patent References:
| JP52068164A | ||||
| JP37009963B1 | ||||
| JP9169953A |
Other References:
J. Org. Chem., 1958, 23(1), 25-26,1958年
J. Am. Chem. Soc., 1948, 70(6), p2079-2081,1948年
J. Am. Chem. Soc., 1948, 70(6), p2079-2081,1948年
Attorney, Agent or Firm:
Takuya Tateishi