Method for treating waste liquid containing polyphenyl ether

A technology for polyphenylene ether and waste liquid, which is applied in the field of processing waste liquid containing polyphenylene ether, and can solve problems such as difficulty in processing

Pending Publication Date: 2022-07-05
大连中沐化工有限公司
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Problems solved by technology

[0003] The synthesis of polyphenylene ether is usually carried out in a solvent. In the solvent recovery stage, due to various reasons, a certain amount of polyphenylene ether will remain or dissolve in the solvent. After evaporation and concentration, a viscous substance with a high solid content will be formed. waste liquid, in actual production, it is difficult to deal with

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0020] The waste liquid W1 containing polyphenylene ether has a solid content of 26%. Mix with 15% precipitating solution, and the precipitating agent is 0.7% NaOH methanol solution. The mixture was introduced into a decanter centrifuge for separation at a speed of 4000 r / min. The light phase solvent is exported to the solvent recovery system, and the heavy phase is the solid phase W2 with a solid content of 52%. W2 was introduced into the devolatilizing extruder, and the extrusion temperature was 100 °C in the front section, 130 °C in the middle section, and 170 °C in the rear section. The recovered solvent is exported to a solvent recovery system, and after extrusion and granulation, dark yellow polyphenylene ether particles W4 are obtained. The intrinsic viscosity of W4 is 0.3dL / g and can be used for resin processing.

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Abstract

The invention relates to a method for treating waste liquid containing polyphenyl ether. In the solvent recovery stage in the production process of polyphenyl ether, a certain amount of thick waste solvent containing polyphenyl ether is generated and is very difficult to treat. The invention provides a method for treating the waste liquid. The method comprises the following steps: a) firstly, mixing the viscous waste liquid with a precipitator; b) introducing the mixed solution into a centrifugal separator for separation, and c) after centrifugal separation, enabling the liquid phase to enter a solvent recovery system, and enabling the solid phase to enter a drying machine or an extruder for further removal of the solvent.According to the method, the solvent and high-value components can be recovered to the maximum extent, and zero emission is realized.

Description

technical field [0001] The invention relates to a method for treating waste liquid containing polyphenylene ether. Background technique [0002] Polyphenylene ether is a general-purpose engineering plastic. Polyphenylene ether is formed by oxidative coupling reaction of substituted phenol in the presence of metal salts / amines under the action of oxygen to form polymers. It has excellent comprehensive performance. The biggest feature is that it has excellent dimensional stability and outstanding electrical insulation under long-term load. It has excellent water resistance and steam resistance, and the products have high tensile strength and impact strength, as well as good creep resistance. In addition, it has better wear resistance and electrical properties. It is mainly used to replace stainless steel to manufacture surgical medical instruments. It can be used to make gears, blower blades, pipes, valves, screws and other fasteners and connectors in the electromechanical...

Claims

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Application Information

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IPC IPC(8): C08G65/46
CPCC08G65/46
Inventor 张洪波骆聪
Owner 大连中沐化工有限公司
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