Continuous neutralizing production method of naphthalene water reducers or homology dispersers of naphthalene water reducers

A naphthalene-based water-reducing agent and a technology for a production method are applied in the field of continuous neutralization production for producing a naphthalene-based water-reducing agent or its homologous dispersant, and can solve the problem of increasing the total volume of the reactor, affecting the normal operation of the continuous reaction, and reducing the cost It can improve the utilization rate and production efficiency, reduce manual operation links, and be beneficial to product quality.

Active Publication Date: 2017-01-04
ZHEJIANG JISHENG CHEM BUILDING MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Among them, neutralization is a main process of naphthalene-based water reducer or its homologous dispersant. In the prior art, liquid sodium hydroxide and/or calcium hydroxide are put into the neutralization tank for neutralization reaction. The neutralization process is mainly intermittent Operation, long production cycle, low efficiency, low utilization rate of equipment, and excessive energy consumption in the production process, resulting in waste of labor and energy
[0003] Compared with liquid caustic neutralizer, soda ash is a lower-cost raw material that can be used to neutralize acidic materials, based on reducing the cost of neutralizing raw materials and avoiding tail gas SO 2 For purposes such as emissions, patent CN201510082982.8 mentions a method and device for the continuous neutralization of β-naphthalenesulfonic acid using soda ash partly instead of liquid caustic soda, continuous operation instead of intermittent neutralization, and comprehensive utilization of waste gas recovery. Continuously neutralize the sulfonated material by two-stage neutralization method: first add sodium hydroxide solution to continuously neutralize the free acid in the sulfonated material in the first stage of neutralization reaction; in the second stage of neutralization reaction, add saturated The sodium carbonate solution continuously neutralizes β-naphthalenesulfonic acid, and the two-stage neutralization reaction adopts soda ash as the neutralizing agent, and a large amount

Method used

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  • Continuous neutralizing production method of naphthalene water reducers or homology dispersers of naphthalene water reducers

Examples

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Example Embodiment

[0029] Example 1

[0030] The continuous neutralization production method of the naphthalene-based water-reducing agent or its homologous dispersant in Example 1 includes the following steps:

[0031] (1). Continuously pump the measured naphthalene-based water-reducing agent or its homologous dispersant condensation liquid into the neutralization device, and at the same time, send the measured soda ash slurry to the neutralization device for continuous neutralization reaction;

[0032] (2). The neutralized material in step (1) overflows from the neutralization device to the buffer tank for full reaction. When the pH of the material in the buffer tank is 7-9, the material is discharged to the subsequent drying device;

[0033] (3) The foam produced in the neutralization device overflows into the foam receiving tank through the overflow pipe, and the foam is eliminated by stirring, the material is separated from the gas carbon dioxide, and the material is returned to the neutralization d...

Example Embodiment

[0036] Example 2

[0037] The neutralization device of this embodiment 2 adopts four-stage continuous neutralization, and the soda ash slurry is continuously added to the neutralization tank 3, the neutralization tank 4, and the neutralization tank 5 according to the required amount of 22%, 28%, 28%, and 22% In the neutralization reactor 6, each stage of the neutralization reactor is provided with a foam overflow pipe two a and a reaction material discharge overflow pipe one b, and the position of the overflow pipe two a is higher than the overflow pipe one b.

[0038] Such as figure 1 As shown, the condensation liquid of the naphthalene-based water reducing agent or its homologous dispersant is continuously pumped into the neutralization tank 3, and the sodium carbonate slurry is continuously pumped into the neutralization tank 3, the neutralization tank 4, the neutralization tank 5 and the neutralization tank In 6, the pumping volume in each neutralization tank is 22%, 28%, 28% a...

Example Embodiment

[0040] Example 3

[0041] In this example 3, there is one neutralization kettle, that is, one-stage neutralization. The production method steps, other devices and connection methods are the same as those in Example 2. The neutralization uses 30% soda ash solution, and the overflow liquid flows to the foam Receive the kettle and return the material liquid to the neutralization kettle 3 after defoaming. Do not repeat the rest here.

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Abstract

The invention relates to a continuous neutralizing production method of naphthalene water reducers or homology dispersers of naphthalene water reducers. The continuous neutralizing production method includes the following steps that (1) weighed condensed liquid of naphthalene water reducers or homology dispersers of naphthalene water reducers is continuously pumped into a neutralizing device, and meanwhile weighed sodium carbonate serosity is fed into the neutralizing device for a continuous neutralizing reaction; (2) the material obtained after neutralizing in the step (1) overflows to a buffering tank from the neutralizing device for sufficient reacting, and when the pH value of the material in the buffering tank is 7 to 9, the material is discharged into a following drying device; (3) foam generated in the neutralizing device overflows into a foam receiving kettle through an overflowing pipe, the foam is eliminated in a stirred mode, the material is separated from gaseous carbon dioxide and returned through a pump into the neutralizing device to continue to be reacted, and the gaseous carbon dioxide is discharged to a tail gas processing device. According to the continuous neutralizing production method, on the premise that product quality is guaranteed, production efficiency is improved, the cost of raw materials is reduced, and the aims of continuous neutralizing and stable running of sodium carbonate for naphthalene water reducers or homology dispersers of naphthalene water reducers are achieved.

Description

technical field [0001] The invention relates to the technical field of continuous neutralization production of naphthalene-based water reducers, in particular to a continuous neutralization production method for producing naphthalene-based water-reducers or homologous dispersants, including naphthalenesulfonic acid formaldehyde condensates, acenaphthylenesulfonic acid formaldehyde Production of condensates, indenesulfonic acid formaldehyde condensates or methylnaphthalenesulfonic acid formaldehyde condensates, etc. Background technique [0002] Naphthalene-based superplasticizers and their homologous dispersants are currently the most widely used concrete superplasticizers in China. Naphthalene series or its homologues are used as the main raw material to form a liquid water reducer by melting naphthalene or its homologues, sulfonation, hydrolysis, condensation, and neutralization, and then dried to obtain a naphthalene series water reducer or its homologous dispersion agen...

Claims

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Application Information

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IPC IPC(8): C04B24/22C04B103/30C04B103/40
CPCC04B24/226C04B2103/302C04B2103/408
Inventor 何旭斌王新武吴建伟孟明朱敬鑫陶建国牟平赵云章法良
Owner ZHEJIANG JISHENG CHEM BUILDING MATERIALS
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