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A method for reducing equipment corrosion in mtbe production device

A production device and methanol recovery technology are applied in the field of reducing the corrosion of methanol recovery system equipment in a methyl tert-butyl ether production device, and can solve the problems of catalyst poisoning, increasing the load of sewage treatment device, increasing water consumption and the like , to achieve the effect of convenient operation and management

Inactive Publication Date: 2011-11-30
KAIRUI ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Because the methanol extraction circulating water also extracts and absorbs the acidic substance in the carbon four after the ether (this acidic substance comes from the etherification reaction acidic resin catalyst) while extracting the methanol, the pH value of the water is reduced to below 6.0, thereby Resulted in chemical and electrochemical corrosion of methanol recovery system equipment piping
[0004] There are two kinds of measures taken before the present invention: one is to make up a large amount of water and discharge water in the circulating water system, which not only increases the consumption of water resources, but also increases the waste water treatment device due to the high COD waste water discharged from the outside. load
The other is to add a certain amount of caustic soda to the circulating water to neutralize the acidic substances in the water and increase the pH value of the water, but this method increases the risk of sodium ions in the methanol recovered by rectification. The return of methanol to the etherification reactor will cause catalyst poisoning and shorten the service life of the catalyst

Method used

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  • A method for reducing equipment corrosion in mtbe production device
  • A method for reducing equipment corrosion in mtbe production device
  • A method for reducing equipment corrosion in mtbe production device

Examples

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Embodiment 1

[0020] Such as figure 1 As shown, in the methanol recovery system in the 10,000-ton MTBE production plant, it includes a methanol extraction tower 1 and a methanol rectification tower 2, and the methanol extraction tower 1 passes through the pipeline 3 of carbon tetrachloride and methanol mixture after ether and the upstream equipment Connected, and connected with the methanol rectification tower 2 through the outlet pipeline 4 and the inlet pipeline 5 of extracting circulating water; on the pipeline 3 of the mixture of carbon four and methanol after the ether, a deacidification tank 6 filled with ion exchange resin is set, and the deacidification tank 6 diameter 1000mm, height H=1500mm, filled with resin 0.8m 3 , of which commercially available 925A acrylic anion exchange resin 0.4m 3 , D113 acrylic cation exchange resin 0.4m 3 .

Embodiment 2

[0022] Such as figure 1 As shown, in the methanol recovery system in the 20,000-ton MTBE production plant, it includes a methanol extraction tower 1 and a methanol rectification tower 2, and the methanol extraction tower 1 passes through the pipeline 3 of carbon four and methanol mixture after ether and the upstream equipment Connected, and connected with the methanol rectification tower 2 through the outlet pipeline 4 and the inlet pipeline 5 of extracting circulating water; on the pipeline 3 of the mixture of carbon four and methanol after ether, a deacidification tank 6 filled with ion exchange resin is set, and the diameter 1200mm, height H=200mm, filled with resin 2m 3 , of which commercially available D301 styrene-based weakly basic anion exchange resin 1m 3 , D113 acrylic cation exchange resin 1m 3 .

Embodiment 3

[0024] Such as figure 1 As shown, in the methanol recovery system in the 50,000-ton MTBE production plant, it includes a methanol extraction tower 1 and a methanol rectification tower 2, and the methanol extraction tower 1 passes through the pipeline 3 of carbon tetrachloride and methanol mixture after ether and the upstream equipment Connected, and connected with the methanol rectification tower 2 through the outlet pipeline 4 and the inlet pipeline 5 of extracting circulating water; on the pipeline 3 of the mixture of carbon four and methanol after ether, a deacidification tank 6 filled with ion exchange resin is set, and the diameter 1400mm, height H=2500mm, filled with resin 3m 3 , of which commercially available D301 styrene-based weakly basic anion exchange resin 1.5m 3 , 925A acrylic anion exchange resin 1.5m 3 .

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Abstract

The invention provides a method for reducing the corrosion of methanol recovery system equipment in an MTBE production unit. The methanol recovery system includes a methanol extraction tower and a methanol rectification tower, and the methanol extraction tower passes through a mixture of C4 and methanol after ether The pipeline is connected with the upstream equipment, and is connected with the methanol rectification tower through the outlet pipeline and the inlet pipeline of extraction circulating water; the described method is to adopt the method of ion exchange to remove the acidic substance in the described methanol recovery system, improve methanol Extract the pH value of the circulating water, thereby reducing the corrosion of the methanol recovery system equipment in the MTBE production unit. The method of the invention also avoids the method of adding alkali in the past in order to increase the pH value of the circulating water and thus causes the poisoning and deactivation of the MTBE catalyst in the reactor caused by methanol carrying sodium ions.

Description

technical field [0001] The invention relates to a method for reducing the loss of chemical equipment, in particular to a method for reducing the corrosion of methanol recovery system equipment in a methyl tert-butyl ether production device. Background technique [0002] Methyl tert-butyl ether (MTBE) is the main additive and blending agent used to improve gasoline octane number and shock resistance in unleaded gasoline in recent years. The by-product C4 is the raw material, in which isobutylene and methanol undergo etherification reaction under the catalysis of acidic resin to generate MTBE. After the etherification reaction, the product MTBE is separated in the catalytic distillation tower or azeotropic tower. The last carbon four enters the methanol recovery system, is extracted with water in the methanol extraction tower, and then enters the methanol rectification tower. The methanol separated by distillation at the top of the tower is returned to the methanol raw materia...

Claims

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Application Information

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IPC IPC(8): C07C31/04C07C29/76
Inventor 刘文飞王金明张勇
Owner KAIRUI ENVIRONMENTAL PROTECTION TECH
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