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Method for producing resorcinol by using sulfur trioxide

A technology of sulfur trioxide and resorcinol, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of increasing the difficulty of three wastes treatment, difficult treatment of sodium sulfate, and large environmental pollution, etc., to achieve Reduced emissions, fewer by-products, and reduced treatment costs

Active Publication Date: 2020-07-03
哈密盛典科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005]The benzene sulfonation alkali fusion method uses benzene as the starting material, the process conditions are simple, and the technology is mature. It is the main production process in China at present, but the environmental pollution is serious
In the production process of the product, a large amount of strong acid and strong alkali are required, and a large amount of inorganic salts Na2S04, Na2SO3(Traditional process uses oleum for monosulfonation reaction, neutralization uses sodium hydroxide, acidification uses dilute sulfuric acid or hydrochloric acid, resulting in a large amount of sodium sulfate or sodium chloride by-products, sodium sulfate is not good treatment, increasing the difficulty of the three wastes treatment), the environmental pressure is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Method for producing resorcinol by using sulfur trioxide

[0029] Turn on the jacket cooling water of the tubular reactor and pass in benzene and sulfur trioxide. The flow rate of benzene is 1-1.5t / h, and the flow rate of sulfur trioxide is 1.2-2t / h. The molar ratio of sulfur trioxide to benzene is 1.05:1, and the temperature in the pipeline is controlled between 30-40°C. Passing through the reactor takes 0.5h and flows into a sulfonation buffer tank.

[0030] Then transfer to the disulfonation reactor, and pass sulfur trioxide into the disulfonation reactor at a rate of 0.5-0.8t / h for disulfonation to obtain isophthalic acid. The reaction temperature is 160℃. The molar ratio of benzene is 1.05:1.

[0031] After the reaction is completed, it is transferred to the neutralization tank, and sodium sulfite solution is added to neutralize to pH=7, and the generated sulfur dioxide is passed into the acidification tank.

[0032] Add sodium hydroxide to the caustic melting kettle, co...

Embodiment 2

[0034] Method for producing resorcinol by using sulfur trioxide

[0035] Turn on the jacket cooling water of the tubular reactor and pass in benzene and sulfur trioxide. The flow rate of benzene is 1-1.5t / h, and the flow rate of sulfur trioxide is 1.2-2t / h, while controlling sulfur trioxide. The molar ratio to benzene is 1.2:1, and the temperature in the pipeline is controlled between 30-40°C. After passing through the reactor for 1 hour, it flows into a sulfonated buffer tank.

[0036] Then transfer to the disulfonation reactor, and then pass the sulfur trioxide into the disulfonation reactor at a rate of 0.5-0.8t / h for disulfonation to obtain isobenzene disulfonic acid, the reaction temperature is 160℃, and the sulfur trioxide The molar ratio with benzene is 1.2:1.

[0037] After the reaction is completed, it is transferred to the neutralization tank, and sodium sulfite solution is added to neutralize to pH=7, and the generated sulfur dioxide is passed into the acidification tank...

Embodiment 3

[0040] Method for producing resorcinol by using sulfur trioxide

[0041] Turn on the jacket cooling water of the tubular reactor and pass in benzene and sulfur trioxide. The flow rate of benzene is 1-1.5t / h, and the flow rate of sulfur trioxide is 1.2-2t / h, while controlling sulfur trioxide. The molar ratio to benzene is 1.1:1, and the temperature in the pipeline is controlled between 30-40°C. Passing through the reactor takes 0.8h, and flows into a sulfonated buffer tank.

[0042] Then transfer to the disulfonation reactor, and then pass the sulfur trioxide into the disulfonation reactor at a rate of 0.5-0.8t / h for disulfonation to obtain isobenzene disulfonic acid, the reaction temperature is 160℃, and the sulfur trioxide The molar ratio with benzene is 1.1:1.

[0043] After the reaction is completed, it is transferred to the neutralization tank, and sodium sulfite solution is added to neutralize to pH=7, and the generated sulfur dioxide is passed into the acidification tank.

[0...

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PUM

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Abstract

The invention discloses a method for producing resorcinol by using sulfur trioxide. The method comprises the following steps: (1) carrying out primary sulfonation on benzene and sulfur trioxide in a tubular reactor with a jacket, and controlling the reaction temperature to be 30-40 DEG C through circulating water introduced into the jacket; (2) transferring the primary sulfonation material into asecondary sulfonation reaction kettle, and introducing sulfur trioxide for secondary sulfonation; (3) carrying out a neutralization reaction on the secondary sulfonation product and sodium sulfite, wherein sulfur dioxide generated in the neutralization process is used as an acidification reagent; (4) melting sodium hydroxide, and then adding the neutralized sulfonation liquid into the molten sodium hydroxide for an alkali fusion reaction; (5) adding water into the alkali fusion reaction solution to dilute the solution; and (6) introducing sulfur dioxide generated in the neutralization reactionstep into water for acidification, wherein sodium sulfite generated by acidification is used for the neutralization reaction. The method has the advantages of mild reaction conditions, full utilization of generated byproducts, reduced treatment cost, economy, environment friendliness, continuous operation of the sulfonation process, and increased automation degree.

Description

Technical field [0001] The invention relates to a production using sulfur trioxide and belongs to the technical field of chemical production. Background technique [0002] Resorcinol is a kind of fine organic chemical material with a wide range of applications. It plays an extremely important role in the fields of agriculture, dyes, coatings, medicine, plastics, rubber and electronic chemicals. In the medical field, resorcinol has a certain bactericidal effect. It can treat skin diseases caused by fungal infections or be used as an intestinal disinfectant. In addition, resorcinol is also an important pharmaceutical intermediate. For example, it is an anti-tuberculosis drug. The starting material for aminosalicylic acid drugs. [0003] At present, international companies that can produce more than 10,000 tons per year include American Indespec Chemical Company and Sumitomo Chemical of Japan. In 2004, the domestic consumption of resorcinol in the United States reached 16,000 tons, ...

Claims

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Application Information

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IPC IPC(8): C07C37/04C07C39/08
CPCC07C37/04C07C303/06C07C39/08C07C309/42C07C309/29
Inventor 乐金波张泉森何彪高天庆
Owner 哈密盛典科技有限公司
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