Title:
【発明の名称】シクロヘキサンからアジピン酸への酸化によって生成した反応混合物から、溶液中の触媒を分離する方法
Document Type and Number:
Japanese Patent JP2002519400
Kind Code:
A
Abstract:
This invention relates to methods of controlling the oxidation of cyclohexane to adipic acid in the presence of a monobasic acid solvent, by extracting the catalyst from the reaction mixture, outside the reaction zone. Substantially all the unreacted cyclohexane, the majority of adipic acid, and preferably substantially all the monobasic acid solvent are removed from the reaction product. In the case that substantially all the monobasic acid solvent is removed, protic solvent, is added intermittently or continuously in the reaction mixture during the removal of the monobasic acid solvent, preferably by distillation, thus preventing solids precipitation. Dipolar aprotic solvent is then added in the presence of an adequate amount of the protic solvent (the total of dipolar aprotic solvent and the protic solvent constituting a novel combination solvent) to maintain a single liquid phase, followed by a step of extracting substantially all the catalyst in protic solvent. The catalyst extract is preferably recycled to the reaction zone, where the cyclohexane is oxidized to adipic acid. Thus, the novel combination solvent, which is preferably a combination of cyclohexanone with water, allows the dissolution of the reaction product, preferably after removal of the majority of the adipic acid, followed by a substantially complete extraction of the catalyst in water. No catalyst precipitation takes place, and all disadvantages and costs of solids handling are prevented.
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Inventors:
Deco Star, David Sea.
Basilieu, Eustatius
Dassell, Mark W.
Rostami, Adder M.
Dodge On, Douglas Jay.
Basilieu, Eustatius
Dassell, Mark W.
Rostami, Adder M.
Dodge On, Douglas Jay.
Application Number:
JP2000558061A
Publication Date:
July 02, 2002
Filing Date:
July 02, 1999
Export Citation:
Assignee:
RPC Inc.
International Classes:
B01J38/00; C07B61/00; C07C51/31; C07C51/42; C07C51/44; C07C55/14; B01J31/40; (IPC1-7): C07C51/31; B01J31/40; B01J38/00; C07C51/44; C07C55/14
Attorney, Agent or Firm:
Shusaku Yamamoto