Method for improving diphenol recovery during phenol hydroxylation product separating and refining process
A technology of phenol hydroxylation and hydroquinone, which is applied in the field of improving the recovery rate of hydroquinone in the process of separation and purification of phenol hydroxylation products, can solve the problems of economic decline in the production process and affect the purity of hydroquinone products, and achieve The method is simple, the recovery rate is improved, and the cost is low
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[0019] Step 1: Put phenol, water, catalyst and hydrogen peroxide into a 50L reactor in sequence according to a certain proportion, and carry out phenol hydroxylation reaction. The specific composition of the reaction solution obtained after the reaction is: water content 37.5%, phenol content 53.5% , catechol content 5%, hydroquinone content 2.5%, tar content 2.5%. After the reaction, take multiple reaction solution samples on average.
[0020] Take a portion of the reaction solution, adopt batch distillation, dehydrate under normal pressure, and separate phenol, catechol, and hydroquinone under reduced pressure; in the final stage of separation, the pressure of the tower kettle is 4KPa, and different final temperatures of the tower kettle are given, and simultaneously observe Tar fluidity. At the end of the separation a tar is obtained. The detailed experimental conditions and data are listed in Table 1.
[0021] The obtained tar was weighed, pulverized, and dissolved in 1...
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