2-Sulfobenzoic acid → 3-Hydroxybenzoic Acid

Participants

Reaction Steps

The sulphobenzoic acid melt is pumped or injected under pressure, for example into previously taken molten 60 to 90% strength sodium hydroxide solution, in the course of which, merely by utilizing the heat thus liberated, the reaction temperature of, for example, 260° to 370° C. is reached, which is advantageous for the subsequent reaction to give 3-hydroxybenzoic acid. If it is intended to achieve, in this process variant, a limitation of the simultaneous increase in pressure, this can be effected by blowing off steam.

Provenance & Evidence