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Xylene formaldehyde resin production method

The technology of a xylene formaldehyde resin and a production method is applied in the production field of the xylene formaldehyde resin, and can solve the problems of large discharge of waste acid and waste water, and achieve the effect of reducing the discharge amount

Inactive Publication Date: 2005-01-26
苏州特种化学品有限公司
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

The catalyst is 98% concentrated sulfuric acid, each reaction produces one ton of resin, and generates about 1.5 tons of waste acid water, and the generated resin needs to be washed with a large amount of washing water to neutrality, resulting in a large amount of waste acid and waste water discharge

Method used

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Embodiment Construction

[0012] A preparation method of xylene formaldehyde resin, comprising the following steps:

[0013] (1) Pour formaldehyde, xylene, and sulfuric acid into the reaction kettle in proportion, stir and heat up to 80°C-120°C, reflux for 8-15 hours, stop stirring, and allow the materials in the reaction kettle to settle still;

[0014] (2) the sulfuric acid in the lower floor in the reactor is let off to get the xylene formaldehyde resin and xylene mixed solution of the upper floor;

[0015] (3), heat up the xylene formaldehyde resin and xylene mixed solution in the reaction kettle, and reclaim xylene under normal pressure; ℃-150℃, stop recovering xylene; filter p-xylene formaldehyde resin with a plate filter.

[0016] In step (1), described formaldehyde is paraformaldehyde, and the content of described paraformaldehyde is 91%-96%, and the concentration of described sulfuric acid is 30%-50%, paraformaldehyde, xylene , The input weight ratio of sulfuric acid is 1 part of paraformald...

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Abstract

The invention provides a process for preparing xylene formaldehyde resin which comprises the steps of, (1) charging paraformaldehyde, dimethylbenzene, and sulfuric acid into reaction kettle, depositing the substances in the reaction kettle, (2) discharging the sulfuric acid in the reaction kettle, adjusting the sulfuric acid concentration to 30-50%, charging right amount of inorganic salt into dimethylbenzene formaldehyde resin and xylene mixed liquid for neutralizing reaction, stationary stratification, filtering water and precipitate, (3) reclaiming xylenes from the mixed liquor in the reaction kettle.

Description

technical field [0001] The invention relates to a preparation method of xylene formaldehyde resin. Background technique [0002] In the prior art, the xylene formaldehyde resin is a kind of light yellow transparent water syrup-like low molecular polymer prepared by reacting xylene and formaldehyde under the condition of sulfuric acid as a catalyst. The catalyst is 98% concentrated sulfuric acid, each reaction produces one ton of resin, and generates about 1.5 tons of waste acid water, and the generated resin needs to be washed with a large amount of washing water to neutrality, resulting in a large amount of waste acid and waste water discharge. Contents of the invention [0003] The purpose of this invention is to provide a kind of preparation method of the xylene formaldehyde resin that can reduce waste acid and waste water discharge. [0004] Technical scheme of the present invention is: a kind of preparation method of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G10/02
Inventor 吴钰荪杨宏谈国英
Owner 苏州特种化学品有限公司
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