System and method for pretreatment of wastewater in ethylene glycol production

Abstract

The invention relates to a system and a method for pretreatment of wastewater in ethylene glycol production. The system comprises a methylal-containing wastewater pretreatment unit, an extracting phase separating device, a raffinate treatment device, a 2-methoxyethanol-containing wastewater pretreatment unit, a fuel ratio mixer, an automatic control device, and an Internet of Things remote monitoring and diagnosis management unit, wherein the methylal-containing wastewater pretreatment unit is a one-stage or multi-stage pressure-relief distillation system; the 2-methoxyethanol-containing wastewater pretreatment unit is mainly a one-stage or multi-stage extracting system. The system has the advantages that the methylal, 2-methoxyethanol and other substances in the wastewater in ethylene glycol production are removed at high efficiency by pressure-relief distillation and multi-stage extracting technologies, and recycled as the resources, so as to create conditions for the subsequent treatment; the running cost of sewage treatment is reduced; the Internet of Things remote monitoring and diagnosis technique is suitable for improving the operating and maintenance management level of theproject, so as to ensure the smooth production and running.

Description

technical field [0001] The invention relates to a pretreatment system and method for ethylene glycol production wastewater, in particular to a system and method for resourceful pretreatment of ethylene glycol production wastewater through remote monitoring, diagnosis and management of the Internet of Things, belonging to the field of resources and environment. Background technique [0002] All current coal chemical projects require zero discharge of wastewater. Ethylene glycol is an important basic chemical raw material. In the formaldehyde hydrocarboxylation method ethylene glycol production process using coal as raw material, a certain amount of high-concentration wastewater containing methylal and 2-methoxyethanol will be produced. It is difficult to carry out conventional biochemical treatment directly, which is a difficulty for zero discharge of wastewater; at the same time, the environmental protection cost of coal chemical projects is high, and the high concentration ...

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the problems of difficult pretreatment, high cost, and difficult operation, management and maintenance of high-concentration wastewater containing methylal and 2-methoxyethanol in the coal-based formaldehyde hydrocarboxylation ethylene glycol production process.

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