Device and process for recycling methyl alcohol from gas field alcohol-containing sewage based on gas stripping process and vacuum membrane distillation process

Abstract

The invention relates to a device and a process for recycling methyl alcohol from gas field alcohol-containing sewage based on a gas stripping process and a vacuum membrane distillation process. A complex process route of performing gas stripping first to obtain a dilute methyl alcohol solution with fewer impurities and then concentrating the dilute methyl alcohol solution through vacuum membrane distillation is adopted. The device and the process have the beneficial effects that related equipment such as a complex rectifying tower, a reboiler and a reflux tank is not needed, so that equipment investment is greatly reduced; the integrated process does not generate methyl alcohol reflux, so that repeated heating of reflux and tower bottoms is avoided, raw materials are sufficiently heated by waste heat of a methyl alcohol product and tower bottom water; waste heat of raw materials heated at a gas-stripping section provides energy for phase change of vacuum membrane distillation, so that methyl alcohol recycling energy consumption is greatly reduced and economic benefits are improved; the problems that content of impurities of alcohol-containing sewage of the raw materials is relatively high and the solution pollutes the hydrophobic microporous membrane are avoided, and the service life of the membrane is prolonged; the gas stripping process and the vacuum membrane distillation composite process are integrated, so that recycling efficiency is improved, and content of methyl alcohol in alcohol-containing sewage is reduced.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment technology and energy saving, and relates to a gas field alcohol-containing sewage methanol recovery device and process based on the gas stripping method and the vacuum membrane distillation method. Background technique [0002] In natural gas production, natural gas hydrates often cause blockage of pipelines, valves, and equipment. In order to inhibit the formation of hydrates, hydrate inhibitors are usually injected into the gathering and transportation pipelines from the gas production wellhead. Methanol is a commonly used inhibitor in gas field production. The methanol injected into the pipeline from the wellhead is dehydrated and separated from the natural gas at the gas gathering station, resulting in alcohol-containing wastewater from the gas field. In natural gas exploitation, due to the large amount of alcohol injected, if it is not recycled, methanol will cost a lot. In additio...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is: based on the above problems, the present invention provides a new process for methanol recovery and integration of alcohol-containing sewage in gas fields with higher separation efficiency, simpler operation, lower energy consumption, and easier industrialization, to solve The methanol recovery process adapts to the large change of methanol content in raw sewage, and reduces the energy consumption of methanol recovery, so as to realize the win-win of economy and environmental protection in the treatment of alcohol-containing sewage in gas fields

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