Reaction device, and vanillin production equipment and production method

Abstract

The invention discloses a reaction device used for condensation reaction of glyoxylic acid and guaiacol, vanillin production equipment containing the reaction device, and a vanillin production method. The reaction device used for condensation reaction of glyoxylic acid and guaiacol provided by the invention comprises a reaction tower set with a total liquid inlet and a total liquid outlet, wherein the reaction tower set comprises at least one vertically-arranged reaction tower; the lower part of the reaction tower is provided with a liquid inlet, and the upper part of the reaction tower is provided with a liquid outlet; the liquid inlet communicates with the total liquid inlet, and the liquid outlet communicates with the total liquid outlet; at least one sieve plate with through-flow holes is arranged inside the reaction tower; and at least one part of the surface of the sieve plate is not parallel with the center line of the reaction tower. The vanillin production equipment disclosed by the invention comprises the reaction device, and the vanillin production method disclosed by the invention adopts the above-mentioned vanillin production equipment. By utilizing the above-mentioned reaction device, conversion rate and selectivity of condensation reaction can be guaranteed, and industrial operation cost is reduced at the same time.

Description

technical field [0001] The invention relates to a chemical synthesis technique for producing vanillin, in particular to a reaction device for condensation of glyoxylic acid and guaiacol, and vanillin production equipment and a vanillin production method including the reaction device. Background technique [0002] Vanillin is a food additive and flavor fixative, widely used in the preparation of tobacco and various cosmetic flavors. [0003] At present, industrial synthesis is the main way to obtain vanillin. The industrial synthesis methods mainly include nitrosation method and glyoxylic acid method. Glyoxylic acid method includes condensation, neutralization, wood phenol extraction, oxidation, decarboxylation and other reaction processes. Among them, the condensation reaction is an important reaction process. In this reaction process, the reaction solution comprising glyoxylic acid and guaiacol (scientific name o-methoxyphenol) is reacted in a suitable reaction device, co...

AI Technical Summary

Problems solved by technology

Condensation reactions based on glyoxylic acid and guaiacol are complex, including main reactions (desired reactions) and side reactions (undesired reactions)

When the condensation reaction is carried out in a stirred tank reactor, it is difficult to control the reaction in the industry, which affects the selectivity of the condensation reaction; in addition, the stirred tank reactor also needs to be equipped with a stirring device that consumes power, and the operating cost is relatively high

Chinese patent document CN101835734B discloses a technique of utilizing a tubular reactor for condensation reaction, but using this technique requires the reaction solution to have a higher Reynolds number or to have fillers in the reaction device. In order to ensure that the condensation reaction is carried out quickly, industrial In the above reaction process, a higher temperature is required and a catalyst and an inert gas are set for protection, which makes the industrial operation cost very high

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