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

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...

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 of carbon dioxide gas generated during the reaction process can be used as a raw material for the subsequent carboxylation reaction after being collected and processed in a unified manner, realizing resource conservation. Comprehensive utilization, but as soda ash neutralizes CO 2 The generation of gas, the neutralization process has the risk of foaming out of the neutralized material, which will make it difficult for continuous neutralization production to proceed smoothly

In addition, the neutralization reaction in the second stage of the process, in order to avoid neutralization produces a large amount of CO 2 Foaming out of the reactor with the material or blocking the pipeline, it is necessary to control the load of the neutralization tank at all levels at a low level, and then control the CO released by the neutralization of the single tank 2 amount, resulting in an increase in the total volume of the reactor or an increase in the number of neutralization tanks that need to be connected in series. This plan sets up a neutralization reactor with two sections and 12 neutralization tanks. The neutralization of the first section still uses a large amount of Liquid caustic neutralizer, the second level of soda liquor neutralizes as many as 8 kettles, the process flow is too long, and if the process is not properly controlled, there is still a risk of material ejection in the number of neutralization kettles, which will affect the normal operation of the continuous reaction

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