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Method using neutralizing wastewater in BHT (butylated hydroxytoluene) production to produce sodium p-toluenesulfonate

A technology of sodium p-toluenesulfonate and p-toluenesulfonic acid is applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., and can solve problems such as increasing the difficulty and cost of wastewater treatment, increasing COD, and unfavorable environmental protection. , to achieve the effect of safe and reliable production process, mild reaction conditions and significant social benefits

Inactive Publication Date: 2019-10-01
江苏迈达新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the neutralized wastewater generated during the production process contains a large amount of sodium p-toluenesulfonate and alkali neutralizer, which leads to a substantial increase in its COD, increases the difficulty and cost of wastewater treatment, and is not conducive to environmental protection.

Method used

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  • Method using neutralizing wastewater in BHT (butylated hydroxytoluene) production to produce sodium p-toluenesulfonate

Examples

Experimental program
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Effect test

Embodiment 1

[0031] according to figure 1 The production process shown is a kind of BHT production neutralization wastewater, wherein the content of sodium p-toluenesulfonate is 19.8%, and the content of alkali neutralizer (alkali containing sodium ions) is 3.7%. The specific steps of using the neutralized wastewater to produce sodium p-toluenesulfonate include: adding an appropriate amount of pH regulator (p-toluenesulfonic acid) to the pH adjustment kettle to adjust the pH value of the neutralized wastewater to 6-7, and then the pump is turned into decolorization Add activated carbon to the decolorization kettle and raise the temperature to 80-90°C. After stirring for 1 hour to decolorize, the pump is transferred to the filter press to filter out the activated carbon. The liquid enters the evaporation and concentration kettle and is heated and evaporated to 120- At 125°C, enter the slicer to cool and slice to obtain the product sodium p-toluenesulfonate, and the evaporated water vapor is...

Embodiment 2

[0033] according to figure 1 The production process shown is a kind of BHT production neutralization wastewater, wherein the content of sodium p-toluenesulfonate is 11.2%, and the content of alkali neutralizer (alkali containing sodium ions) is 2.1%. The specific steps for producing sodium p-toluenesulfonate from the neutralized waste water include: adding an appropriate amount of pH regulator (p-toluenesulfonic acid) to the pH adjustment tank to adjust the pH value of the neutralized waste water to 6-7, and then transfer it to the decolorization tank , add activated carbon into the decolorization kettle and raise the temperature to 80-90°C, stir for 1 hour to decolorize, then transfer to a filter press, filter out the activated carbon, the liquid enters the evaporation and concentration kettle, heat and evaporate to 120-125°C under normal pressure, Enter the slicer to cool and slice to obtain the product sodium p-toluenesulfonate, and the evaporated water vapor is condensed a...

Embodiment 3

[0035] according to figure 1 The production process shown is a kind of BHT production neutralization wastewater, wherein the content of sodium p-toluenesulfonate is 26.8%, and the content of alkali neutralizer (alkali containing sodium ions) is 4.7%. The specific steps for producing sodium p-toluenesulfonate from the neutralized waste water include: adding an appropriate amount of pH regulator (p-toluenesulfonic acid) to the pH adjustment tank to adjust the pH value of the neutralized waste water to 6-7, and then transfer it to the decolorization tank , add activated carbon into the decolorization kettle and raise the temperature to 80-90°C, stir for 1 hour to decolorize, then transfer to a filter press, filter out the activated carbon, the liquid enters the evaporation and concentration kettle, heat and evaporate to 120-125°C under normal pressure, Enter the slicer to cool and slice to obtain the product sodium p-toluenesulfonate, and the evaporated water vapor is condensed a...

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Abstract

The invention belongs to the technical field of chemical engineering, and particularly relates to a method using neutralizing wastewater in BHT (butylated hydroxytoluene) production to produce sodiump-toluenesulfonate. The neutralizing wastewater comprises sodium p-toluenesulfonate and an alkaline neutralizing agent. The method comprises the following steps of step 1, adjusting the pH (potentialof hydrogen) value of the produced neutralizing wastewater in BHT production process to 6 to 7; step 2, discoloring the neutralizing wastewater with adjusted pH value by an adsorbent; step 3, filtering the discolored neutralizing wastewater, evaporating and concentrating, cooling, and crystallizing, so as to obtain a crude product of the sodium p-toluenesulfonate. The method has the advantages that the wastewater of the BHT technology can be eliminated, the difficult problem of environment protection is solved, the wastewater can be recycled as resource, the production cost of the sodium p-toluenesulfonate is reduced, and the economic benefit is increased.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for producing sodium p-toluenesulfonate by using BHT (2,6-di-tert-butyl-4-methylphenol) to produce neutralized waste water. Background technique [0002] At present, the main method of producing the antioxidant BHT (chemical name 2,6-di-tert-butyl-4-methylphenol) in the chemical industry is to use p-cresol as a raw material to introduce isobutylene under the action of an acidic catalyst for alkylation reaction. Generate 2,6-di-tert-butyl 4-methylphenol and obtain alkylated liquid. Then the acidic catalyst in the alkylation solution is reacted with the alkali neutralizer to generate a salt-containing neutralization solution, which is separated from the alkylation solution. The salt-containing neutralizing solution and excess alkali neutralizing agent form neutralizing wastewater, which is discharged as wastewater after treatment. After removing the...

Claims

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Application Information

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IPC IPC(8): C07C303/44C07C309/30
CPCC07C303/44C07C309/30
Inventor 陈福新陈琦朱志宏索潇萌马春明
Owner 江苏迈达新材料股份有限公司
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