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Method of producing naphthalene series water reducing agent by refined naphthalene residual oil fraction

A technology of naphthalene-based water reducer and residual oil, which is applied in the field of chemical product production and can solve the problems of shortage of raw materials and high cost

Inactive Publication Date: 2009-01-14
CHEMIAL PLANT GANGCHENG ENTERPRISE GENERAL PANZHIHUA IRON & STEEL GROUP
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Problems solved by technology

[0003] In order to solve the problems of shortage of raw materials and high cost in the production of naphthalene-based water reducers by using pure industrial naphthalene as raw material, the present invention provides a method for producing naphthalene-based water reducers by utilizing fractions of refined naphthalene residual oil

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  • Method of producing naphthalene series water reducing agent by refined naphthalene residual oil fraction

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Embodiment Construction

[0011] Add 300 grams of refined naphthalene residual oil fractions in a 1000 ml three-necked flask, heat and melt to 120° C. and turn on the stirrer. Then the temperature was raised to 150°C and 330 g of 98% concentrated sulfuric acid was evenly added dropwise, and kept at 150°C-160°C for 2-3 hours under stirring to carry out the sulfonation reaction. After the reaction, cool down to 120°C, add 81ml of water, hydrolyze at 110-120°C for 50 minutes, then add sulfuric acid to make the total acidity around 30%. When the reactant cools down to about 90°C, after dropping 191 grams of 37% formaldehyde within 2 hours, carry out condensation reaction at 95-105°C for 2 hours. When the pH value reaches 7-9, carry out vacuum filtration, concentrate the filtrate to 50%, and spray dry to obtain a brown powder product, or concentrate to a certain concentration to obtain a liquid product.

[0012] Table 1 Comparison Table of Performance Parameters of Water Reducer Produced by the Present Inv...

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Abstract

A preparation method of naphthalene water-reducing agent by using refined naphthalene residual oil fraction is provided, when material temperature reduced to lower than 120 DEG C, adding cold water to hydrolyze, maintaining acidity between 27%-30%, then condensing by adding 38% formaldehyde, the temperature is controlled between 110-120 DEG C; after adding formaldehyde, the temperature is controlled between 95-105 DEG holding 2.5 hours, when products sedimentation is up to standard, neutralizing to neutrality by alkali then drying. Each index of the water-reducing agent prepared by the method has accorded with CB8076-87 standard.

Description

technical field [0001] The invention belongs to the field of chemical product production, and relates to a process for producing FDN water-reducer with industrial naphthalene, in particular to a method for producing naphthalene-based water-reducer by utilizing fractions of refined naphthalene residual oil. Background technique [0002] With the increasing development of engineering construction and the improvement of people's needs, more and more requirements are put forward for the performance of concrete. The use of additives in concrete is recognized as an effective measure to increase the strength of concrete, improve performance, and save cement consumption. Additives, especially water-reducing agents, have become the fifth important constituent material in concrete besides cement, water, sand, and stone. The development of water-reducing agents, especially high-efficiency water-reducing agents, has become a driving force for cement application science and concrete. One...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/22C04B103/30
CPCC04B20/023C04B24/226Y02W30/91C04B18/0481C04B20/04
Inventor 毛国伦李洋贾玉林徐遵尚石玉英
Owner CHEMIAL PLANT GANGCHENG ENTERPRISE GENERAL PANZHIHUA IRON & STEEL GROUP
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