Recovery method of naphthalene in production of efficient naphthalene water reducing agent and required system thereof

Abstract

Belonging to the technical field of concrete admixture production, the invention especially relates to a recovery method of naphthalene in production of an efficient naphthalene water reducing agent and a system thereof. The naphthalene recovery method comprises: placing a naphthalene sulfonic acid hydrolysate into a first film evaporator (1), and controlling the temperature and vacuum degree to make naphthalene and water form an azeotrope, which is sent into a first naphthalene reception filter (10) for recovery. The naphthalene recovery system consists of: a first film evaporator (1), a naphthalene sulfonic acid hydrolysis kettle (2), a first condenser, a first naphthalene reception filter (10) and a vacuum pump (12). A condensation outlet (102) of the first film evaporator (1) is communicated with a condensation medium inlet (501) of the first condenser; the condensed naphthalene outlet (503) is communicated with a raw material inlet of the first naphthalene reception filter (10); and a vacuum interface of the first naphthalene reception filter (10) is communicated with the vacuum pump (12). The system of the invention has the advantages of simple operation, high recovery rate, good material stability and low cost.

Description

Technical field [0001] The present invention is the field of concrete exterior production technology, especially in the production method and its required systems in the production of an efficient water reduction agent. Background technique [0002] The water reducing agent is made of industrial 萘 sulfate, hydrolysis, formaldehyde contraction, and alkaline liquid neutralization.The response rate is generally around 80%, and most of the 20%of the unresponsive manufacturers are not recycled. Therefore, the recycling of 萘 is of great significance.A major topic is also an important means to improve product competitiveness. A small number of manufacturers adopt the method of recycling the method of water vapor distillation.Therefore, the method and equipment to seek a new high -efficiency recycling 萘 have significant practical significance. Invention content [0003] The present invention aims to overcome the shortcomings of existing technology and provide a high recycling method wit...

AI Technical Summary

Problems solved by technology

[0002]Naphthalene-based water reducer is made of industrial naphthalene through sulfuric acid sulfonation, hydrolysis, formaldehyde condensation, and lye neutralization. The biggest one is that naphthalene accounts for more than 60% of its production cost, and the reaction rate of naphthalene is generally about 80%, and the unreacted 20% naphthalene is not recycled by most manufacturers, so the recovery of naphthalene is of great significance, and the utilization rate of naphthalene In other words, the recovery rate has become a major issue in the production of naphthalene-based high-efficiency water reducers, and it is also an important means to improve product competitiveness. A small number of manufacturers use steam distillation to recover naphthalene, but the recovery time is long and the recovery rate is low. It is not high enough, and the material is easy to decompose for a long time in contact with hot steam. Therefore, it is of great practical significance to find a new method and equipment for recovering naphthalene with high efficiency.

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