Method for improving p-cresol production rate and p-cresol product purity

A production rate, p-cresol technology, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems affecting the concentration of sodium toluenesulfonate, the reaction cannot be carried out, and the concentration of total sodium salts is high, so as to achieve improvement Productivity benefits, cost savings, effects of increased reaction rates

Inactive Publication Date: 2012-02-15
SHANDONG CAIYANGZI SALTWORKS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] If the two components of sodium sulfite and sodium sulfate have a high concentration in the reaction solution, it will cause the illusion of a high total sodium salt concentration in the reaction solution, which will obviously affect the concentration

Method used

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  • Method for improving p-cresol production rate and p-cresol product purity
  • Method for improving p-cresol production rate and p-cresol product purity
  • Method for improving p-cresol production rate and p-cresol product purity

Examples

Experimental program
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Example Embodiment

[0027] Example 1

[0028] Such as figure 2 As shown, a method for improving the production rate and purity of p-cresol includes a sulfonation reaction process, a neutralization reaction process, and an alkali melting process, wherein the specific operation steps of the alkali melting process are as follows:

[0029] (1) Heat the sodium sulfite solution, add solid sodium sulfite to the by-product sodium sulfite solution obtained in the acidification process of the p-toluenesulfonic acid production process, and finally control the concentration of the solution to 320g / L, and then heat it to boiling;

[0030] (2) Alkali melting reaction: After mixing molten NaOH and sodium p-toluenesulfonate solution, the alkali melting reaction is carried out.

[0031] The reaction raw materials are the by-product sodium sulfite solution of the acidification process in the p-toluenesulfonic acid production process, the sodium p-toluenesulfonate solution generated in the neutralization reaction process,...

Example Embodiment

[0033] Example 2

[0034] A method for improving the production rate and purity of p-cresol includes a sulfonation reaction process, a neutralization reaction process and an alkali melting process, wherein the specific operation steps of the alkali melting process are as follows:

[0035] (1) Heating the sodium sulfite solution: add solid sodium sulfite to the by-product sodium sulfite solution obtained in the acidification process of the p-toluenesulfonic acid production process, and finally control the concentration of the solution to 360g / L, and then heat it to boiling;

[0036] (2) Alkali melting reaction: After mixing molten NaOH and sodium p-toluenesulfonate solution, the alkali melting reaction is carried out.

[0037] The reaction raw materials are the by-product sodium sulfite solution of the acidification process in the p-toluenesulfonic acid production process, the sodium p-toluenesulfonate solution generated in the neutralization reaction process, and molten sodium hydroxid...

Example Embodiment

[0039] Example 3

[0040] A method for improving the production rate and purity of p-cresol includes a sulfonation reaction process, a neutralization reaction process and an alkali melting process, wherein the specific operation steps of the alkali melting process are as follows:

[0041] (1) Heating the sodium sulfite solution: add solid sodium sulfite to the by-product sodium sulfite solution obtained in the acidification process of the p-toluenesulfonic acid production process, and finally control the concentration of the solution to 340g / L, and then heat it to boiling;

[0042] (2) Alkali melting reaction: After mixing molten NaOH and sodium p-toluenesulfonate solution, the alkali melting reaction is carried out.

[0043] The reaction raw materials are the by-product sodium sulfite solution of the acidification process in the p-toluenesulfonic acid production process, the sodium p-toluenesulfonate solution generated in the neutralization reaction process, and molten sodium hydroxid...

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Abstract

The invention discloses a method for improving a p-cresol production rate and p-cresol product purity. The method aims at improving the concentration of a sodium sulfite solution. The method is characterized in that solid sodium sulfite is added into a by-product sodium sulfite solution so that the concentration of the by-product sodium sulfite solution is improved; then the by-product sodium sulfite solution is heated to boiling and undergoes a neutralization reaction with p-toluenesulfonic acid which is a product of a sulfonation process to produce sodium p-toluenesulfonate; and sodium p-toluenesulfonate and molten sodium hydroxide undergo an alkali fusion reaction. The method improves a reaction rate by about 10%, saves a cost by about 5%, improves greatly production efficiency, reduces side reaction production by about 2%, and improves p-cresol product purity so that product quality is guaranteed.

Description

technical field [0001] The invention relates to a production process of p-cresol, in particular to a method for improving the production rate and purity of p-cresol, which belongs to the field of chemical industry. Background technique [0002] The production process of p-cresol is mainly an alkali fusion reaction, and the concentration of sodium p-toluenesulfonate, the raw material of the alkali fusion reaction, plays a key role in the reaction rate, such as figure 1 As shown, the reactions involved are as follows: [0003] (1) Sulfonation reaction: [0004] [0005] [0006] (2) Neutralization reaction: [0007] [0008] (3) Alkali fusion reaction: [0009] [0010] The key point of this reaction is to shorten the reaction time, increase the reaction rate, and reduce side reactions, and it is the most direct and effective method to increase the concentration of the raw material sodium toluenesulfonate solution. [0011] The raw materials in the alkali fusio...

Claims

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Application Information

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IPC IPC(8): C07C39/235C07C37/64
Inventor 杨伟王元洲侯成亮杨彩霞
Owner SHANDONG CAIYANGZI SALTWORKS
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