Process for the preparation of benzoic acid
AssigneeStamicarbon B.V.
InventorsLudovicus A. L. Kleintjens, Hubertus M. J. Grooten
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Abstract
Benzoic acid is prepared by oxidation of toluene with an oxygen containing gas, the process is characterized in that the oxidation reaction product is subjected to an extraction with a gas of which the critical temperature is lower than 435 K, this being effected by passing it during at least 1 minute over or through the oxidation reaction product at a flow rate of at least 1 m.sup.3 gas per hour per kg of benzoic acid at a temperature of 285-340 K and at a pressure of at least 3 MPa.
Claims8
In a process for the preparation of benzoic acid by the oxidation of toluene in the presence of a gas containing molecular oxygen yielding a reaction product containing impurities, the improvement essentially comprising extracting impurities from said reaction product, in solid or liquid form, with an extraction gas essentially consisting of at least one gas having a critical temperature lower than 435 K., by passing said extraction gas over or through said reaction product at a flow rate of at least 1 m.sup.3 (NTP) gas per hour per kg benzoic acid for a time period of at least one minute, at a temperature within the range of between about 285 and 340 K. and at a pressure of at least 3 MPa.
Dependencies are inferred from the claim text.