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Improved method for recovering methanol from methanol rectification purge gas

A technology for recovering methanol and methanol rectification, which is applied in chemical instruments and methods, preparation of organic compounds, separation/purification of hydroxyl compounds, etc., can solve problems such as inability to meet, and achieve improved structure, reduced circulation, and flexible washing operations. Effect

Inactive Publication Date: 2017-03-08
EAST CHINA ENG SCI & TECH
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Problems solved by technology

In the past, methanol and other organic matter in the emission of light components from methanol rectification has been far greater than this value! Can no longer meet the requirements of the latest emission standards

Method used

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  • Improved method for recovering methanol from methanol rectification purge gas
  • Improved method for recovering methanol from methanol rectification purge gas
  • Improved method for recovering methanol from methanol rectification purge gas

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specific Embodiment

[0038] Such as figure 1 , first preheat the crude methanol from the methanol synthesis section to about 72°C and then inject it into the pre-rectification tower. The purpose is: to provide the pre-distillation tower with heat for distilling crude methanol and to adjust the pressure and temperature of the pre-rectification tower, then input the crude methanol until the liquid level is about 50-90%, and then use steam to heat the evaporator To about 50 ~ 100 ℃, at this time the pressure is about 1 bar. The pressure, temperature and liquid level of the evaporator are automatically adjusted by the remote DCS system. In addition, the pre-distillation column is equipped with: safety relief device (PSV), liquid level and pressure interlock system (interlock) and emergency discharge system (ESD). Start the steam reboiler, when the process parameters reach the set value, the two-stage condenser at the top of the pre-distillation tower starts to condense and separate, and about 5-10% ...

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Abstract

The invention discloses an improved method for recovering methanol from methanol rectification purge gas. According to the invention, a purge gas washing tower and a pre-tower reflux tank are employed, gas at top of a pre-tower at a rectification section passes through two-stage condensation, a light component purge gas after condensation is introduced into the purge gas washing tower; deionized water is introduced as an extraction washing agent for circularly extracting and washing, and centrifugation and gravity self-separating auxiliary equipment and a separator plate are employed at a column reactor segment for standing, extracting, separating light oil and methanol. The method can extract and recover methanol, solves the problem of discharge of noncondensable gas after the environmental protection standard is increased, and has the advantages of concise process, less equipment investment, and easy operation.

Description

technical field [0001] The invention relates to the field of methanol recovery methods in methanol rectification purge gas, in particular to an improved method for recovering methanol from methanol rectification purge gas. Background technique [0002] In the new "Petroleum and Chemical Pollutant Discharge Standard" GB31571-2015, the emission limit of organic pollutants in exhaust gas emissions is more stringent, among which methanol is 50mg / m3. In the past, methanol and other organic matter in the emission of light components from methanol rectification has been far greater than this value! Can no longer meet the requirements of the latest emission standards. Environmental protection is forcing technology upgrades without delay! At present, in the methanol plants that have been built and operated or are under construction in China, there are mainly the following configuration methods for processing light components: 1. Methanol plants with 300,000 tons / year and below gene...

Claims

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Application Information

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IPC IPC(8): C07C31/04C07C29/80C07C29/86C07C29/76
CPCC07C29/76C07C29/80C07C29/86C07C31/04
Inventor 陈学记
Owner EAST CHINA ENG SCI & TECH
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