Title:
METHOD FOR PRODUCING 3,3',5,5'-TETRAALKYL-4,4'-BIPHENOL
Document Type and Number:
Japanese Patent JP3860820
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing a tetraalkylbiphenol (TABP) capable of repeatedly performing the recovery and reuse of unreacted dialkylphenol (DAP) and advantageous from industrial viewpoint.
SOLUTION: The production method comprises (A) a step to perform the oxidative dimerization reaction of DAP with an oxygen-containing gas in the presence of an aqueous solvent and a metal catalyst and obtain an aqueous slurry containing TABP dispersed in an aqueous reaction liquid containing unreacted DAP, the metal catalyst and a carbonylphenol (CP) compound as an impurity and (B) a step to separate TABP from the aqueous slurry by solid-liquid separation process. The aqueous slurry and/or the aqueous reaction liquid recovered by the step B are distilled to recover an azeotropic mixture composed of water and the unreacted DAP and a part of the recovered fraction containing the CP compound is supplied to the oxidative dimerization reaction step.
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Inventors:
Norikatsu Shimoyama
Yoshiaki Sawada
Yoshiaki Sawada
Application Number:
JP2004154400A
Publication Date:
December 20, 2006
Filing Date:
May 25, 2004
Export Citation:
Assignee:
Mitsubishi Chemical Corporation
International Classes:
C07C37/11; C07B61/00; C07C37/74; C07C37/84; C07C39/15; (IPC1-7): C07C37/11; C07C37/74; C07C37/84; C07C39/15; //C07B61/00
Domestic Patent References:
| JP2003327554A | ||||
| JP3275638A | ||||
| JP61268641A |
Foreign References:
| WO1988002745A1 |
Attorney, Agent or Firm:
Kazuhiko Okada