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公开(公告)号：DE3368600D1
公开(公告)日：1987-02-05
申请号：DE3368600
申请日：1983-12-29
Applicant: STAMICARBON
IPC: C07C63/06 , C07C51/00 , C07C51/42 , C07C51/487 , C07C67/00
Abstract: benzoic acid is prepared from raw benzoic acid made by oxidation of toluene with an oxygen containing gas, the process is characterized in that the oxidation reaction product is contacted with at least 1 m 3 per kg of benzoic acid of a gas with a critical temperature lower than 435 K by passing this gas through the oxidation reaction product at a flow rate of at least 1 m 3 per hour per kg of benzoic acid at a temperature of 340-600 K and a pressure of at least 3 MPa. The pharmaceutical benzoic acid is separated from the mixture by cooling it to 315-370 K at a pressure of 3-300 MPa.
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