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Preparation method for synthetizing high efficiency water reducing agent by 2-naphthol waste water

A high-efficiency water-reducing agent and naphthol technology, which is applied in the field of preparation of 2-naphthol wastewater synthesizing high-efficiency water-reducing agent, can solve the problem of not seen synthetic high-efficiency water-reducing agent in naphthol wastewater, human and environmental hazards, and high wastewater concentration problems, to achieve the effect of good economic value and social benefits, good dispersion ability, and simple production process

Inactive Publication Date: 2012-07-18
天津市飞龙砼外加剂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process is cumbersome, and a large amount of waste water is discharged during the production process
There are technical problems such as high concentration of wastewater, high toxicity, deep color, strong acid-base buffering ability, difficult biochemical degradation, and great harm to human body and environment.
[0005] CN1120030 reported a method for synthesizing a high-efficiency water reducer by using waste phenol residue in an oil refinery; "Research on the Synthesis of FDN Type High Efficiency Concrete Water Reducer Using Naphthalene Residual Oil" reported a method for using coal tar at 210°C-260°C to distillate products The method of synthesizing high-efficiency superplasticizers has not seen the report of directly using naphthol wastewater to synthesize high-efficiency superplasticizers

Method used

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  • Preparation method for synthetizing high efficiency water reducing agent by 2-naphthol waste water
  • Preparation method for synthetizing high efficiency water reducing agent by 2-naphthol waste water
  • Preparation method for synthetizing high efficiency water reducing agent by 2-naphthol waste water

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation method of 2-naphthol wastewater synthesis high-efficiency water reducer, put 500g of industrial naphthalene into a four-necked flask with stirring, add 460g of 98% concentrated sulfuric acid dropwise when heated to 140°C, and Keep warm for 2.5 hours under the same conditions, add 220g of 2-naphthol wastewater when the temperature drops to 100°C, hydrolyze for 1 hour, add 37% formaldehyde solution dropwise at 95°C-105°C and keep warm for 5 hours. Cool to room temperature and add 32% liquid caustic soda to neutralize to pH 8 to obtain the final product high-efficiency water reducer.

Embodiment 2

[0029] The preparation method of 2-naphthol wastewater synthesis high-efficiency water reducer, put 500g of industrial naphthalene into a four-necked flask with stirring, add 500g of 98% concentrated sulfuric acid dropwise when heated to 140°C, and heat it at 160°C-165°C Keep warm for 2 hours under the same conditions. When the temperature drops to 100°C, add 200g of 2-naphthol wastewater, hydrolyze for 0.5 hours, keep warm at 95°C-105°C, add dropwise 37% formaldehyde solution and keep warm for 4 hours. Cool to room temperature and add 32% liquid caustic soda to neutralize to pH 8 to obtain the final product high-efficiency water reducer.

Embodiment 3

[0031] The preparation method of 2-naphthol wastewater synthesis high-efficiency water reducer, put 500g of industrial naphthalene into a four-necked flask with stirring, add 500g of 98% concentrated sulfuric acid dropwise when heated to 140°C, and heat it at 160°C-165°C Keep warm for 2 hours under the same conditions, when the temperature drops to 100°C, add 100g of water and 100g of 2-naphthol wastewater, hydrolyze for 0.5 hours, keep warm at 95°C-105°C, add dropwise 37% formaldehyde solution and keep warm for 5 hours, after the condensation is completed , cooling it to room temperature and adding 32% liquid caustic soda to neutralize to pH 8 to obtain the final product high-efficiency water reducer.

[0032] Implementation Effect

[0033] Table 1. The following is the performance status of the present invention and various performance comparisons with other similar products

[0034]

[0035]

[0036] Table 1 is the performance index of the water reducer prepared by t...

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Abstract

The invention relates to a preparation method for synthetizing a high efficiency water reducing agent by 2-naphthol waste water. The invention belongs to the technical field of concrete water reducing agents. According to the preparation method for synthetizing the high efficiency water reducing agent by the 2-naphthol waste water, the proportion of crude naphthalene to concentrated sulfuric acid to naphthol waste water to formaldehyde is (1:0.8)-(1.0:0.1)-(0.9:0.5)-0.8. The preparation method for synthetizing the high efficiency water reducing agent by the 2-naphthol waste water comprises the following process flows of: 1-, sulfonating: heating to melt crude naphthalene, adding the concentrated sulfuric acid when the temperature rises to 130-160 DEG C, and reacting for 2-2.5 hours at the temperature of 160-165 DEG C; 2-, hydrolyzing: cooling reactants to 90-110 DEG C, adding naphthol waste liquor and hydrolyzing for 0.5-1 hour; 3-, condensation: dropwise adding the formaldehyde at the temperature of 95-115 DEG C and reacting for 3-6 hours; and (4) neutralizing: adding liquid caustic soda to neutralize a condensation compound to regulate a pH value to be 7-9 to obtain a water reducing agent product. The preparation method for synthetizing the high efficiency water reducing agent by the 2-naphthol waste water has the advantages that the production process is simple, the operation is convenient, the process control is easy, waste is turned into wealth, and thereby, secondary emission cannot be generated, and the economic value and the social benefit are high and the like.

Description

technical field [0001] The invention belongs to the technical field of concrete water reducers, in particular to a method for preparing a high-efficiency water reducer synthesized from 2-naphthol wastewater. Background technique [0002] Concrete water reducer is an indispensable component of high-performance concrete. It not only improves the performance of concrete and the quality of buildings, but also greatly saves cement, manpower and material resources, and has high value. [0003] At present, naphthalene-based water reducers have the largest production capacity and are most widely used. Naphthalene-based high-efficiency water reducers account for more than 70% of the amount of water reducers. It is characterized by high water-reducing rate, no air-entrainment, little effect on setting time, relatively good adaptability to cement, compound use with various other admixtures, and relatively cheap price. [0004] 2-Naphthol, also known as β-naphthol, is an important org...

Claims

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Application Information

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IPC IPC(8): C04B24/22
Inventor 石春李和生刘子香刘子红石兵
Owner 天津市飞龙砼外加剂有限公司
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