| abstract |
The invention discloses a kind of method of toluene oxidation coproduction benzaldehyde, phenmethylol and benzoic acid, comprise the following steps：(1) aoxidize：Toluene, catalyst and oxygen-containing gas are continuously passed through into oxidation reactor to be reacted, and obtain oxidation liquid；(2) hydrolyze：Oxidation liquid is continuously entered in hydrolysis reactor, and is continuously added to water into hydrolysis reactor and is reacted, obtains hydrolysis reaction mixture；(3) liquid liquid is layered：Hydrolysis reaction mixture is continuously entered into liquid liquid quantizer, obtained containing toluene and phenmethylol, the upper oil phase of benzaldehyde and lower floor's aqueous phase containing phenmethylol, benzaldehyde and benzoic acid；(4) separation of product：Upper oil phase progress rectifying is respectively obtained into the complete toluene of unreacted, phenmethylol and benzaldehyde product, by lower floor's aqueous phase crystallisation by cooling filtering, obtains filtrate and benzoic acid product.The present invention has the advantages of feed stock conversion is high, accessory substance is few, target product selectivity is good, green. |