Method and device for preparing metacresol

2010 
The invention discloses a method and a device for preparing metacresol. The method comprises the following steps of: adding nitrosyl sulfuric acid into aminotoluene sulfate for performing diazotization and hydrolysis continuously in a pipe reactor; after the hydrolysis is finished, separating the mixture rapidly to obtain an acid phase and an organic phase, extracting the acid phase by using an organic solvent and flashing the acid phase under negative pressure; recycling a part of acid for salifying; reproducing the nitrosyl sulfuric acid by using the other part of the acid; and performing heavy eliminating and rectifying on the organic phase to obtain the metacresol product. In the invention, the nitrosyl sulfuric acid is taken as a diazotization reagent, and the waste acid dose not contain any inorganic salts, so that the waste acid can be used for the industry; and the purity of the metacresol product obtained by the device and the method is 99.6 percent, and the yield is over 86 percent.
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