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Method for retarding corrosion of rectification system of vinyl acetate device

A rectification system and vinyl acetate technology are applied in the field of slowing down the corrosion of the rectification system of a vinyl acetate unit, which can solve the problems of easily causing corrosion, increasing unplanned shutdowns, and increasing the maintenance cost of enterprise equipment, so as to reduce inspection and maintenance costs, solve or Corrosion Problems, Corrosion Mitigation Effect

Pending Publication Date: 2022-06-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in actual production, there are many by-products in the production of vinyl acetate by the acetylene gas phase method, and the products contain corrosive media such as acetic acid, formic acid, acetaldehyde, and crotonaldehyde, which cause corrosion problems in the long-term operation of the equipment, especially in the subsequent separation. The unplanned shutdown of the rectification system in the workshop is increasing, resulting in an increase in the maintenance cost of the enterprise's equipment, and an effective corrosion control method is urgently needed

Method used

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  • Method for retarding corrosion of rectification system of vinyl acetate device
  • Method for retarding corrosion of rectification system of vinyl acetate device
  • Method for retarding corrosion of rectification system of vinyl acetate device

Examples

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Effect test

Embodiment 1

[0066] This embodiment provides a method for slowing down the corrosion of the rectification system of a vinyl acetate unit, comprising the following steps:

[0067] Detect the content of corrosive substances in the rectification system;

[0068] Compare the content of detected corrosive substances with the fortification value of corrosive substances established according to the service material of the rectification system;

[0069] When the detected content of corrosive substances is higher than the fortification value of corrosive substances, part of the corrosive substances will be discharged from the discharge port set at the end of the rectification system;

[0070] Among them, the corrosive substance is the chloride ion in the acetic acid material.

[0071] Set the fortification value for corrosive substances to 30 μg / g for chloride ions.

[0072] In the above process, detecting the content of corrosive substances in the rectification system includes: setting a samplin...

Embodiment 2

[0076] The difference between this embodiment and Embodiment 1 is that the fortification value of corrosive substances is set to 50 μg / g of chloride ions.

Embodiment 3

[0078] The difference between this embodiment and Embodiment 1 is that the fortification value of corrosive substances is set to 10 μg / g of chloride ions.

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Abstract

The invention discloses a method for retarding corrosion of a rectification system of a vinyl acetate device, and belongs to the technical field of chemical production. The method comprises the following steps: detecting the content of corrosive substances in a rectification system in a vinyl acetate device; comparing the detected content of the corrosive substance with a fortification value of the corrosive substance established according to a service material of the rectification system; and when the content of the detected corrosive substance is higher than the fortification value of the corrosive substance, discharging part of the corrosive substance from a discharge port arranged at the tail end of the rectification system. The method can effectively avoid or reduce non-planned shutdown caused by the corrosion problem, reduce the investment cost of equipment pipeline replacement, labor and the like of an enterprise, reduce the safety risk, and guarantee safe, stable and long-period operation of a rectification section device.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for slowing down the corrosion of a rectification system of a vinyl acetate unit. Background technique [0002] The industrial production of vinyl acetate mainly adopts two methods: acetylene method and ethylene method. The current situation of rich coal and little oil resources in my country makes the preparation of vinyl acetate by acetylene method become the mainstream technology of domestic enterprises, especially the calcium carbide acetylene method. Usually, the calcium carbide acetylene production device is mainly composed of synthesis, exhaust gas recovery, rectification, catalyst configuration, tar recovery and other processes. [0003] Among them, the rectification step is to separate and refine the crude vinyl acetate from the synthesis step. However, in actual production, there are many by-products in the production of vinyl acetate by the acetyle...

Claims

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Application Information

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IPC IPC(8): G01N27/42C07C67/54C07C69/15
CPCG01N27/423C07C67/54C07C69/15
Inventor 刘希武刘旭霞王涛曹振兴武新宁鲁佳洁李辉苗普邹洋
Owner CHINA PETROLEUM & CHEM CORP
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