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Method for preparing high-efficiency concrete water reducer by using waste water from synthesis process of p-aminophenol

A technology of p-aminophenol and high-efficiency water-reducing agent, which is applied in the field of preparation of amino-aromatic sulfonic acid-based high-efficiency water-reducing agent, can solve problems such as environmental pollution of aminophenol, and achieve low cost of raw materials, high water-reducing rate, and difficulty in bleeding. Effect

Inactive Publication Date: 2012-06-20
TIANJIN VOCATIONAL INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Another object of the present invention is to provide a new way of comprehensive utilization of p-aminophenol production waste liquid to solve the problem of environmental pollution in the production process of p-aminophenol

Method used

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  • Method for preparing high-efficiency concrete water reducer by using waste water from synthesis process of p-aminophenol
  • Method for preparing high-efficiency concrete water reducer by using waste water from synthesis process of p-aminophenol
  • Method for preparing high-efficiency concrete water reducer by using waste water from synthesis process of p-aminophenol

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Experimental program
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Effect test

Embodiment 1

[0041] In a four-necked flask equipped with a thermometer, a stirrer, a dropping funnel, and a reflux condenser, add 436 g of phenol-containing waste liquid produced by the synthesis of p-aminophenol (containing 0.1 mol of p-aminophenol, 4,4'-dihydroxydi Aniline 0.05mol), add 26.0g (0.15mol) of p-aminobenzenesulfonic acid, stir until completely dissolved, adjust the pH to 8.0-8.5 with 30% sodium hydroxide solution, and start to drop the mass ratio when heating to 90-95°C 24.3g (0.30mol) of 37% formaldehyde aqueous solution, carry out condensation reaction at reflux temperature for 6 hours after dropwise addition, then adjust pH 10-11 with 30% sodium hydroxide solution, continue reflux condensation for 1 hour, then add urea 1.0 g to completely convert residual formaldehyde, concentrate in vacuo, and cool to obtain a 40% aminoarene sulfonate superplasticizer liquid sample.

[0042] The synthesized water reducer was tested for the fluidity of ordinary Portland cement slurry with ...

Embodiment 2

[0044] In a four-necked flask equipped with a thermometer, a stirrer, a dropping funnel, and a reflux condenser, add 436 g of phenol-containing waste liquid produced by the synthesis of p-aminophenol (containing 0.1 mol of p-aminophenol, 4,4'-dihydroxydi Aniline 0.05mol), add 4.7g (0.05mol) of phenol, add 26.0g (0.15mol) of p-aminobenzenesulfonic acid, stir until completely dissolved, adjust pH to 8.0-8.5 with 30% sodium hydroxide solution, heat up to 90- At 95°C, start to drop 28.4g (0.35mol) of formaldehyde solution with a mass ratio of 37%. After the dropwise addition, carry out condensation reaction at reflux temperature for 6 hours, then adjust the pH to 10-11 with 30% sodium hydroxide solution, and continue to reflux Condensate for 1 hour, then add 1.0 g of urea to completely convert residual formaldehyde, concentrate in vacuo, and cool to obtain a 40% aminoarene sulfonate high-efficiency water reducer liquid sample.

[0045] The synthesized water reducer was tested for ...

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Abstract

The invention discloses a method for preparing high-efficiency concrete water reducer of aromatic amino sulfonic acid through condensation reaction of waste water from synthesis process of p-aminophenol with sulfanilic acid and formaldehyde. The molar ratio of the materials of phenolic compound, sulfanilic acid and formaldehyde for condensation reaction during the preparation process is controlled to be 1:(0.5-1):(1.5-2.5); the molar ratio of phenol added to the sulfanilic acid is controlled to be (0-1):1; the reaction temperature and the pH value of the reaction solution are controlled on a segmental basis; and after the reaction is finished, the reaction solution is condensed under vacuum condition to obtain the high-efficiency water reducer liquid of aromatic amino sulfonate with the mass ratio of 40%. Not only is the environment pollution problem in the production process of p-aminophenol solved, but also the high-efficiency concrete water reducer of aromatic amino sulfonic acid with low cost can be prepared.

Description

technical field [0001] The invention relates to a preparation method of amino aromatic sulfonic acid high-efficiency water reducer, especially a method for preparing amino aromatic sulfonic acid high-efficiency water reducer by using p-aminophenol synthesis waste liquid to partially or completely replace phenol, which belongs to fine chemical industry and chemical building materials field. Background technique [0002] Amino aromatic sulfonic acid series high-efficiency water reducer for concrete is mainly formed by condensation of phenol, p-aminobenzenesulfonic acid and formaldehyde. Because of its simple production process, good dispersion of cement particles and high water reducing rate, the prepared concrete Due to the advantages of high strength, good durability, and small loss of slump over time, the application and development have been widely valued. With the rapid development of the construction and chemical building materials industry, traditional concrete will be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G14/073C04B24/22C04B103/30
Inventor 李建生何北菁吕英芳温景汀杨菲刘钰朱亚楠梁鑫莲
Owner TIANJIN VOCATIONAL INST
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