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Process for operating methanol rectification system

A methanol rectification system and process technology, applied in the field of improving the operation mode of the methanol rectification system, can solve the problems of affecting the working efficiency of the equipment, consuming a lot of time, COD exceeding the standard, etc., so as to achieve unaffected product quality and reduce economic losses , the effect of saving time

Active Publication Date: 2011-05-18
YANKUANG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The methanol rectification unit mainly adopts the three-tower double-effect energy-saving process, which not only saves steam but also saves cooling water, and improves product quality. In the system, if the COD in the circulating water system exceeds the standard, the refined methanol cooler of the pressurized tower must be overhauled. There is no longer any product output, which affects the working efficiency of the equipment. Even if the maintenance is smooth and the distillation is started, it will take a lot of time for the product quality to reach the first-class product, which will bring great economic losses.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A kind of operation technology of methanol rectification system, comprises the steps:

[0014] (1) According to the pressure and temperature of each point of the rectification tower, the liquid level changes of the three towers and the reflux tank, the rectification feed amount is changed from 69m 3 / h reduced to 36m 3 / h, the reflux flow of the pressurized tower is 63m 3 / h added to 90m 3 / h, to ensure the normal and stable operation of the three towers;

[0015] (2) Under the premise of ensuring the stable operation of the pressurization tower, the production volume of the small pressurization tower is reduced from 32m 3 / h reduced to 0m 3 / h, until the outlet valve of the pressurization tower is completely closed, the pressurization tower is in a state of full reflux, and the liquid level of the pressurization tower is kept at 65% and the liquid level of the reflux tank of the pressurization tower is kept at 28%, which is normal before decrement state at runtime...

Embodiment 2

[0020] A kind of operation technology of methanol rectification system, comprises the steps:

[0021] (1) According to the pressure and temperature of each point of the rectification tower, the liquid level changes of the three towers and the reflux tank, the rectification feed amount is changed from 69m 3 / h reduced to 36m 3 / h, the reflux flow of the pressurized tower is 63m 3 / h added to 90m 3 / h, to ensure the normal and stable operation of the three towers;

[0022] (2) Under the premise of ensuring the stable operation of the pressurization tower, the production volume of the small pressurization tower is reduced from 32m 3 / h reduced to 0m 3 / h, until the outlet valve of the pressurization tower is completely closed, the pressurization tower is in a state of full reflux, and the liquid level of the pressurization tower is kept at 71% and the liquid level of the reflux tank of the pressurization tower is kept at 34%, which is normal before the reduction state at run...

Embodiment 3

[0027] A kind of operation technology of methanol rectification system, comprises the steps:

[0028] (1) According to the pressure and temperature of each point of the rectification tower, the liquid level changes of the three towers and the reflux tank, the rectification feed amount is changed from 69m 3 / h reduced to 36m 3 / h, the reflux flow of the pressurized tower is 63m 3 / h added to 90m 3 / h, to ensure the normal and stable operation of the three towers;

[0029] (2) Under the premise of ensuring the stable operation of the pressurization tower, the production volume of the small pressurization tower is reduced from 32m 3 / h reduced to 0m 3 / h, until the outlet valve of the pressurization tower is completely closed, the pressurization tower is in a state of full reflux, and the liquid level of the pressurization tower is kept at 69% and the liquid level of the reflux tank of the pressurization tower is kept at 31%, which is normal before decrement state at runtime...

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Abstract

The invention relates to a method for improving a process for operating a methanol rectification system. The technical scheme comprises the following steps of: reducing rectification charging rate, increasing reflux quantity of a pressurization tower, gradually closing the recovery volume of the pressurization tower until all recovery valves of the pressurization tower are switched off and the pressurization tower is in a total reflux state, and the liquid level of the pressurization tower and the liquid level of a reflux tank of the pressurization tower are in a normal operational state; appropriately increasing the recovery of an atmospheric column, drawing a methanol cooler of the pressurization tower, handing over and overhauling; and after overhauling is completed, putting the methanol cooler of the pressurization tower into use, gradually increasing the rectification charging rate, gradually reducing the reflux quantity of the pressurization tower, and gradually increasing the recovery of the pressurization tower to ensure that the rectification is in a normal operational state. The normal operation of rectification is guaranteed by adopting the mode, so a normal product is recovered in the rectification process; therefore, time and labor power are reduced, and the product quality is not influenced.

Description

technical field [0001] The invention belongs to the field of chemical engineering, and in particular relates to a method for improving the operation mode of a methanol rectification system. Background technique [0002] The methanol rectification unit mainly adopts the three-tower double-effect energy-saving process, which not only saves steam but also saves cooling water, and improves product quality. In the system, if the COD in the circulating water system exceeds the standard, the refined methanol cooler of the pressurized tower must be overhauled. There is no more product output, which affects the working efficiency of the equipment. Even if the maintenance is smooth and the distillation is started, it will take a lot of time for the product quality to reach the top grade, and bring about a large economic loss. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a rectification system "...

Claims

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Application Information

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IPC IPC(8): C07C31/04C07C29/80
Inventor 冯仁庆马廷卫赵兰龙申友军胡云程建光孙西英
Owner YANKUANG GRP CO LTD
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