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Sulphonation process for producing dye dispersant and concrete water reducing agent

A technology of concrete water reducing agent and dye dispersing agent, applied in the direction of organic dyes, chemical change purification/separation, etc., can solve the problems of reducing product yield and environmental pollution, etc.

Inactive Publication Date: 2004-08-25
JIANGDU RUNHUA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of its technology: in the production process, an excessive amount of concentrated sulfuric acid is used to sulfonate the aromatic ring, and the excess SO is removed during neutralization 4 2- , adding Ca(OH) 2 , so that it generates precipitated sulfate. This process also produces a large amount of CaSO while removing metal salts that affect product quality. 4 and other waste residues, because the waste residues contain a large amount of synthetic effective substances, thereby reducing the product yield, and more importantly, the treatment of waste residues and waste residues causes environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0009] Example 1: Production of 1100kg dye dispersant

[0010] Take by weighing 600kg methylnaphthalene and 450kg of 98% concentrated sulfuric acid respectively.

[0011] Put methylnaphthalene and concentrated sulfuric acid into the sulfonation reaction kettle, raise the temperature to 160°C, add dropwise the azeotropic solvent composed of cyclohexane and chlorinated benzene, after 2 hours of reaction, when the acidity is 20±1%, stop the dropwise addition Azeotropic solvent. The evaporated azeotropic solvent enters the oil-water separator, the azeotropic solvent is recycled, and the acid water is discharged after neutralization. After the material in the sulfonation reactor is hydrolyzed, formaldehyde is added in proportion to condense for 3 to 6 hours, then 30% NaOH aqueous solution is added to adjust the pH value to 7 to 8, and dried to obtain 1100 kg of the product. The indicators are as follows:

[0012] Appearance: light yellow powder

[0013] Dispersion rate: 101~102%...

example 2

[0019] Example 2: Production of 1200kg concrete superplasticizer

[0020] Take by weighing 600kg industrial naphthalene and 550kg of 98% concentrated sulfuric acid respectively.

[0021] Put industrial naphthalene and concentrated sulfuric acid into the sulfonation reaction kettle respectively, stir, raise the temperature to 165°C, add the mixture of azeotropic solvent dichloroethane, chlorinated benzene and kerosene dropwise, and the evaporated azeotropic agent flows into the oil-water separation tank after cooling , the azeotropic solvent is recycled, and the acid water is discharged after neutralization. After 3 hours of heat preservation reaction, when the measured sulfonation acidity is 22±1%, stop adding the azeotropic solvent dropwise. After the material in the sulfonation reactor is hydrolyzed, add formaldehyde dropwise to condense for 4-6 hours, add 580-650 kg of 30% NaOH during neutralization, adjust the pH value to 7.5-8.0, and obtain 1200 kg of product. The indic...

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Abstract

The present invention relates to a method for producing dye dispersant and concrete water-reducing agent by using aromatic hydrocarbon, and it is characterized by that it mixes the aromatic hydrocarbon with concentrated sulfuric acid and makes them implement sulfonation reaction, and the mole ratio of aromatic hydrocarbon and concentrated sulfuric acid is 1:0.9-1.3, and in the course of fulfonation process an azeotropic solvent can be added so as to make the sulfonation resultant water promptly be discharged out from the reaction system and can ensure completion of the sulfonation, then the obtained material can be undergone the processes of hydrolysis and condensation, so that the product whose Na2SO4 content is 1%-10% can be obtained.

Description

technical field [0001] The present invention relates to methods for producing dye dispersants and concrete water reducers from aromatic hydrocarbons. Background technique [0002] The traditional method of producing dye dispersants and concrete water reducers from aromatic hydrocarbons: aromatic hydrocarbons are sulfonated, hydrolyzed, condensed, neutralized, filtered, and dried to obtain dispersants, and can also be made into liquid products without drying. The disadvantage of its technology: in the production process, an excessive amount of concentrated sulfuric acid is used to sulfonate the aromatic ring, and the excess SO is removed during neutralization 4 2- , adding Ca(OH) 2 , so that it generates precipitated sulfate. This process also produces a large amount of CaSO while removing metal salts that affect product quality. 4 and other waste residues, because the waste residues contain a large amount of synthetic effective substances, thereby reducing the product yie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/20C07C7/171C09B67/46
Inventor 徐兆桐徐大勇
Owner JIANGDU RUNHUA CHEM