Process for producing acetate from p-toluene sulfonic acid

Abstract

The invention relates to a process for producing acetate from p-toluene sulfonic acid; a solid p-toluene sulfonic acid catalyst is added into deionized water and stirred to prepare an aqueous solution; the prepared aqueous solution is pressurized for standby use; acetic acid and n-propanol are added into an esterification reactor, the catalyst aqueous solution is pumped into the reactor, the mixture is uniformly mixed and heated to 105-110 DEG C to complete preparation of a reaction base material. The beneficial effects are that the experimental result of corrosiveness of the p-toluene sulfonic acid esterification system is obviously better than the experimental result of corrosiveness of sulfuric acid as a catalyst; the miscibility effect of the p-toluene sulfonic acid with the reaction raw materials is better; the p-toluene sulfonic acid catalyst does not need to be additionally added, and the loss of the catalyst is less; kettle residue of p-toluene sulfonic acid catalysis is stillrelatively clear; and the content of alcohols in crude esters produced by p-toluene sulfonic acid catalytic reaction is less, and the content of unknown substances is 0.17%, which is obviously lower.Waste esterification liquid produced by esterification of the p-toluene sulfonic acid catalytic system is about 5 ml, and the p-toluene sulfonic acid is obviously better than the sulfuric acid.

Description

technical field [0001] The invention relates to the field of esterification catalysis, in particular to a process for producing acetate by using p-toluenesulfonic acid. Background technique [0002] The catalyst usually used in the direct esterification of acid alcohol is diluted sulfuric acid aqueous solution, and the hydrogen ions ionized by sulfuric acid participate in the esterification reaction in the aqueous solution; although the content of this catalyst aqueous solution in the esterification kettle liquid is only 0.5%~1 %, the catalyst has the characteristics of low catalytic reaction temperature and high catalyst activity, and has always been a type of catalyst commonly used in esterification reactions; but this type of catalyst has the following shortcomings: 1. Acid corrosion is a common problem of acid catalysts; 2. The sulfuric acid catalyst has an oxidation effect on the reaction raw materials; 3. The sulfuric acid catalyst has dehydration to the reaction raw m...

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Problems solved by technology

[0002] The catalyst usually used in the direct esterification of acid alcohol is diluted sulfuric acid aqueous solution, and the hydrogen ions ionized by sulfuric acid participate in the esterification reaction in the aqueous solution; although the content of this catalyst aqueous solution in the esterification kettle liquid is only 0.5%~1 %, the catalyst has the characteristics of low catalytic reaction temperature and high catalyst activity, and has always been a type of catalyst commonly used in esterification reactions; but this type of catalyst has the following shortcomings: 1. Acid corrosion is a common problem of acid catalysts; 2. Sulfuric acid catalyst has oxidation effect on reaction raw materials; 3. Sulfuric acid catalyst has dehydration to reaction raw materials; 4. Under certain conditions, sulfuric acid catalyst has a side reaction with raw material alcohol to produce sulfuric acid ester, bisulfate and other products

It is not an acid catalyst. Although it is very less corrosive to equipment, the selectivity of the reaction is also very high, and the side reactions are relatively few, but the catalytic activity temperature is relatively high. For example, the reaction temperature of stannous oxide and titanate catalysts is as high as 180°C The above are generally only suitable for the esterification reaction of high boiling point reaction raw materials

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