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Industrialized method for preparing resorcin

A technique for resorcinol and m-phenylenediamine is applied in the field of preparation of resorcinol and can solve the problems of poor process economy, high cost of sewage treatment, low yield of resorcinol and the like

Active Publication Date: 2007-05-09
九江常宇化工有限公司
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  • Description
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Problems solved by technology

[0010] The disadvantage of this kind of sulfonated alkali fusion method for preparing resorcinol is that a large amount of waste water will be generated when acid is used to neutralize the material after alkali fusion. In the production of 1 ton of resorcinol, about 60 tons of sewage will be produced. Such a large amount of sewage will not only endanger the environment, but also the treatment cost of sewage treatment is relatively high; in addition, the yield of resorcinol prepared by sulfonated alkali fusion method is low , can only reach 70%; so the process economy of preparing resorcinol by sulfonation alkali fusion method is relatively poor

Method used

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  • Industrialized method for preparing resorcin
  • Industrialized method for preparing resorcin
  • Industrialized method for preparing resorcin

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Embodiment 1

[0027] The industrialized preparation method of the resorcinol of the present embodiment has the following steps:

[0028] 1. add 70kg m-phenylenediamine to the 2540kg aqueous sulfuric acid solution of 5% concentration by weight under stirring, so that the mol ratio of m-phenylenediamine consumption and sulfuric acid consumption (calculated by pure substance, the same below) is 1: 2.0, thereby Obtain uniformly mixed mixed raw materials;

[0029] ②Put the prepared mixed raw materials into the sealed zirconium reactor with pressure relief valve, thermometer and pressure gauge, seal the reactor after adding the mixed raw materials, and then heat the mixed raw materials in the reactor by means of oil bath heating to 240°C to make m-phenylenediamine hydrolyze to generate resorcinol, and keep heating for 8 hours to complete the hydrolysis reaction;

[0030] ③When the hydrolysis reaction is completed, stop heating, and perform pressure relief treatment on the mixed material in the r...

Embodiment 2 to Embodiment 5

[0035] The rest are basically the same as in Example 1, except that the ratio of raw materials and process parameters in each example are different, and the relevant data in each example are shown in Table 2.

[0036] Example serial number

Embodiment 6

[0038] The rest are basically the same as in Example 1, except that the extraction device used in this example is a packed extraction tower; the extraction agent used is n-butanol, and the process parameters in each process step are slightly different. The relevant data in this embodiment are shown in Table 3.

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Abstract

This invention relates to a method for preparing resorcinol. The method comprises: (1) adding sulfuric acid aqueous solution into m-phenylenediamine under stirring to obtain uniformly mixed raw materials; (2) adding the mixed raw materials into a reactor, sealing, heating, hydrolyzing to obtain resorcinol, and continuously heating till the hydrolysis reaction is complete; (3) terminating heating, and discharging pressure; (4) adding the mixed materials into an extraction apparatus, and extracting with an extractant; (5) rectifying the extract to remove the extractant and obtain resorcinol product. This invention has such advantages as high yield and little pollution.

Description

technical field [0001] The invention relates to a preparation method of resorcinol. Background technique [0002] Resorcinol (also known as dihydroxybenzene) is an important fine chemical intermediate. Its application field is mainly in the rubber industry. It is used in the production of tackifying resins for rubber, wood adhesives, and ultraviolet absorbers. There are also applications in dyes and other fields. With the eastward movement of the world's tire industry and the rapid development of China's rubber product industry, China has become the fastest growing country in the global resorcinol market. [0003] At present, the main method of producing resorcinol in my country is the sulfonated alkali fusion method. The process of sulfonation alkali fusion method is briefly described as follows: [0004] (1) sulfonation reaction of liquid benzene in oleum generates benzenesulfonic acid, and benzenesulfonic acid further generates m-benzenedisulfonic acid through sulfonat...

Claims

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Application Information

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IPC IPC(8): C07C37/05C07C39/08
Inventor 马燕东李全泉肖如亭
Owner 九江常宇化工有限公司
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