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 rectificatio

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

Examples

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Example Embodiment

[0037] Specific embodiment:

[0038] Such as figure 1 , The crude methanol from the methanol synthesis section is preheated to about 72°C and then fed into the pre-rectification tower. Before transmission, the shell side of the reboiler at the bottom of the pre-rectification tower is passed into 0.5MPaG steam. The purpose is: to provide heat for the distillation of crude methanol to the pre-rectification tower and to adjust the pressure and temperature of the pre-rectification tower, and then feed the crude methanol to a liquid level of about 50 to 90%, and then use steam to heat the evaporator When it reaches about 50-100°C, 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-rectification tower 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...

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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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