Preparation method of naphthalene series dehydragent and special equipment thereof

Abstract

The invention discloses a preparing method of naphthalene system dehydragent and special equipment, which comprises the following steps: leading vapour with pressure at 0. 5-0. 7MPa into private dissolving naphthalene autoclave jacket; leading vapour with pressure at 0. 4-0. 6MPa into private sulfonated autoclave jacket; leading vapour with pressure at into 0. 2-0. 4MPa into private hydrolysis and condensed autoclave jacket. This invention can increase product quality, decrease energy consumption and can short production circle.

Description

technical field [0001] The invention relates to the production and preparation process of concrete admixture for construction and its special equipment, in particular to the preparation process of cement water reducer and its special equipment. Background technique [0002] In the construction industry, water reducing agents have become an indispensable admixture for high performance concrete. Water reducing agent can greatly reduce the mixing water of concrete, enhance its fluidity and high strength. At present, as far as China is concerned, naphthalene-based superplasticizers account for more than 90% of the total superplasticizers. Naphthalene-based high-efficiency water reducers are usually made of industrial naphthalene as the main raw material, and are produced through melting naphthalene, sulfonation reaction, hydrolysis reaction, and condensation reaction. The existing naphthalene-based high-efficiency water reducer preparation process is generally to first put sol...

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Problems solved by technology

This process has the following deficiencies: 1. Since the vapor pressure in the whole process is balanced and consistent, but the temperature required for different processes in the production process is not the same, it is necessary to cool the reactor to adjust the temperature during the production process. , which not only consumes time but also causes a lot of waste of steam; 2. Excessive steam pressure causes the surface temperature of the reactor to be too high, and the product quality is difficult to control; 3. The temperature difference in the jacket of the reactor varies greatly, which is detrimental to the service life of the equipment

4. Since the melting, sulfonation, hydrolysis and condensation reactions are all carried out in the same reaction kettle, the reaction kettle must be an enamel reaction kettle, and the enamel reaction kettle has high cost and relatively weak tolerance. When inputting solid industrial naphthalene raw materials When it is used, it is easy to smash the enamel surface in the reactor, thus shortening its service life

5. The production cycle of this process is long, the labor intensity of workers is high, and the process requirements are relatively complicated, which is not convenient for workers to operate and control the production process

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