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Method and device for preparing metacresol

A technology of cresol and toluidine, which is applied in the field of m-cresol preparation, can solve problems such as difficult processing, equipment selection, use, and maintenance difficulties, and achieve the goals of improving intrinsic safety, reducing cost and difficulty, and saving investment Effect

Inactive Publication Date: 2014-06-11
JIANGSU HUAIHE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0026] In the above methods, a large amount of salt-containing waste acid will be produced, which is extremely difficult to deal with, and also brings difficulties to the selection, use, and maintenance of equipment

Method used

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  • Method and device for preparing metacresol

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Effect test

Embodiment 1

[0048] The preparation device is composed of three sets of pipeline reactors and separators, rectification towers, extractors and flash towers connected in series through pipelines. In the three sets of pipeline reactors in series, each reactor is equipped Heater, the temperature of the first group of salt pipeline reactors is maintained at 25-35 °C, the temperature of the second group of diazotization pipeline reactors is maintained at -3-5 °C, and the temperature of the third group of hydrolysis pipeline reactors is maintained at 75-100 °C .

[0049] In the salt-forming pipeline reactor, continuously adding mass concentration simultaneously is 275 grams of sulfuric acid of 40%, 60 grams of m-toluidine, obtains the aqueous solution of m-toluidine sulfate;

[0050] The above-mentioned m-toluidine sulfate aqueous solution and 144 g of nitrosyl sulfuric acid with a mass concentration of 50% are evenly and continuously added in the diazotization pipeline reactor to make it react ...

Embodiment 2～12

[0055] According to the method and device described in embodiment 1, the amount of the sulfuric acid that drops into when salifying and the amount of the nitrosyl sulfuric acid that drops into when diazotization are the ratio of the amount of the m-toluidine substance that drops into when it and salt, Now the charging table of embodiment 2~12 is listed as follows:

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Abstract

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.

Description

technical field [0001] The invention belongs to the field of fine chemicals manufacturing, and in particular relates to a preparation method and device of m-cresol. Background technique [0002] There are three isomers of cresol, namely o-cresol, m-cresol and p-cresol, which are all important chemical raw materials. The chemical name of m-cresol is 3-hydroxytoluene, and its molecular formula is C 7 h 8 O, is a colorless to light yellow flammable liquid with phenol odor, it can be used in industries such as medicine, pesticide, dye, spice, barrel resin, plasticizer, film, antioxidant and reagent, mainly for synthesis Meprocarb, fenthion, antioxidant CA, tribromocresol, 4-nitro-m-cresol, 3-phenoxytoluene, m-cresol, m-methyldiphenylaldehyde, cresolsulfonic acid Calcium, disperse yellow SE-5R, chlorocresol m-cresyl, 2-chloro-5-cresol, 4-chloro-3-cresol, m-hydroxybenzaldehyde and other chemical raw materials and products. [0003] Present m-cresol preparation method mainly con...

Claims

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Application Information

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IPC IPC(8): C07C39/07C07C37/045B01J14/00
Inventor 董云孙雅坤陆龙王廷锋万金方
Owner JIANGSU HUAIHE CHEM
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