Method for preparing water reducer from oxyanthraquinone byproduct

A technology of by-product and water-reducing agent, which is applied in the field of recycling and utilization of oxidized anthraquinone by-products, can solve the problems of single monomer and poor adaptability of cement varieties, and achieve the effect of improving water reduction.

Inactive Publication Date: 2015-07-01
徐兆桐 +1
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  • Application Information

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Problems solved by technology

At present, the monomers in these superplasticizer products are relatively single, and their performances also have their own characteristics. The adaptability to cement varieties is relatively poor.

Method used

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Embodiment Construction

[0017] 1. Separate the aqueous solution of sodium phthalate from the by-product of oxidized anthraquinone:

[0018] Add 300kg of 30% sodium hydroxide solution and 1,000kg of water into a 3,000-liter stainless steel reactor, stir and raise the temperature to 40-60°C, and then gradually add 1,000kg of anthraquinone by-products into the reactor for reaction. Insulate and react at 70°C for half an hour, then vacuum filter the mixture with a filter, the resulting filtrate mainly contains sodium phthalate, collect and store the filtrate, and use it as a synthetic raw material for concrete water reducers.

[0019] The solid matter obtained by filtration is mainly anthraquinone. After washing to neutral, the solid filtrate is dried and dehydrated by a dryer to obtain anthraquinone product. Quinone" standard requirements.

[0020] 2. Preparation of naphthalene-based concrete water reducer:

[0021] Put 850kg of industrial naphthalene into a 3,000-liter enamel reaction kettle, rai...

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Abstract

The invention discloses a method for preparing a water reducer from an oxyanthraquinone byproduct and relates to the technical field of oxyanthraquinone reclamation and concrete water reducer production. The method comprises the following steps: mixing a sodium hydroxide water solution and the oxyanthraquinone byproduct to perform neutralization reaction, and separating to obtain a sodium phthalate water solution; mixing the sodium phthalate water solution with a monomer used as a naphthalene, aliphatic series or sulfamic acid concrete water reducer, adding formaldehyde to perform condensation reaction to obtain the modified naphthalene, aliphatic series or sulfamic acid concrete water reducer. The sodium phthalate can be condensed in the molecule of the product under the effect of the formaldehyde to obtain the modified water reducer; because the sodium phthalate is a monomer of the condensation compound containing a carboxylic acid group, in the disperse system of the water solution, the carboxylic acid group and the dispersed substance can form a hydrogen binding adsorption, and the water reduction and the plastic retaining performance of the water reducer are increased.

Description

technical field [0001] The invention relates to the recycling technology of oxidized anthraquinone by-products, and also relates to the technical field of production of concrete water reducers. Background technique [0002] Anthraquinone is an important dye intermediate, and its manufacturing process is divided into two types: o-xylene synthesis method and refined anthracene gas phase oxidation method. Due to the undeveloped post-processing of coal chemical industry in the past, the output of refined anthracene was low, so the output of anthraquinone produced by the oxidation of refined anthracene was small, and most of the market share was occupied by synthetic anthraquinone. In recent years, with the development of coal tar deep processing technology, many domestic enterprises with coal tar resources have extracted refined anthracene and carbazole on a large scale, which has put a large number of refined anthracene into the market, and also spawned a batch of refin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/16C04B24/20C04B103/30
Inventor 徐兆桐徐卞融
Owner 徐兆桐
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