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Acetic acid dehydration method

A technology of acetic acid dehydration and acetic acid, applied in chemical instruments and methods, separation/purification of carboxylic acid compounds, preparation of carboxylic acid esters, etc. consumption effect

Active Publication Date: 2020-09-29
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is in order to overcome the isophthalic acid (PIA) production process that prior art exists, the acetic acid that produces and water relative degree of separation are low, the acetic acid dehydration energy consumption is high, the acetic acid purity that tower still separates is low, acetic acid A method for dehydrating acetic acid in the production process of isophthalic acid (PIA) is provided due to the defects of large consumption, high acetic acid content, high acetic acid odor, and high COD value in the waste water discharged from the top of the rectifying tower

Method used

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Experimental program
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Effect test

Embodiment 1

[0069] according to figure 1As shown in the process flow, the number of trays of the rectification tower is counted from the top of the tower to the bottom of the tower, and the liquid phase stream obtained after heat exchange in the first crystallizer enters the rectification tower from the 25th theoretical plate of the rectification tower. The gaseous stream obtained after the second crystallizer is partially gaseous enters the rectification tower from the 56th theoretical plate of the rectification tower. The rectification tower has an operating pressure of 10KPa and a temperature of 85°C. : 1, the reboiler is heated by 4MPa steam, the operating temperature of the bottom of the first separation tower is 75°C, the operating temperature of the top of the first separation tower is 80°C; the operating temperature of the top of the second separation tower is 10 ℃, the temperature in the middle of the tower is 60℃, the temperature in the bottom of the tower is 100℃, and it is car...

Embodiment 2

[0071] according to figure 1 As shown in the process flow, the number of trays of the rectification tower is counted from the top of the tower to the bottom of the tower, and the liquid phase flow obtained after heat exchange in the first crystallizer enters the rectification tower from the 28th theoretical plate of the rectification tower. The gaseous stream obtained after the second crystallizer partial gas phase enters the rectification tower from the 53rd theoretical plate of the rectification tower. The operating pressure of the rectification tower is 20KPa, the temperature is 90°C, and the mass ratio of the entrainer to water in the rectification tower is 4 : 1, the reboiler is heated by 4MPa steam, the operating temperature of the bottom of the first separation tower is 80°C, the operating temperature of the top of the first separation tower is 85°C; the operating temperature of the top of the second separation tower is 20°C ℃, the temperature in the middle of the tower...

Embodiment 3

[0073] According to the method of Example 1, the difference is: the mass ratio of the entraining agent to water in the rectification column is 2:1. The operation effect of this acetic acid dehydration method is shown in Table 1.

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Abstract

The invention relates to the field of isophthalic acid production, and discloses an acetic acid dehydration method. The method comprises the following steps: introducing a first material flow into a rectifying tower with a reboiler for azeotropic distillation, introducing a part of a tower kettle material flow of the rectifying tower into the reboiler for a heating treatment, then circulating thetower kettle material flow back into the rectifying tower; leading out a second material flow from the side line of the rectifying tower, and leading out the remaining part in the tower kettle material flow of the rectifying tower as an acetic acid product; introducing a fourth material flow obtained from the tower top of the rectifying tower into a first separation tower from the tower top of thefirst separation tower, separating the fourth material flow, obtaining an entrainer from the tower bottom of the first separation tower, and leading out a fifth material flow from the side line of the first separation tower; introducing the fifth material flow into a second separation tower for separation; wherein the entrainer is n-propyl acetate, and materials in the rectifying tower form an azeotropic system under the operating conditions of the rectifying tower. The energy consumption and the material consumption in the acetic acid dehydration process and the content of acetic acid in thewastewater are remarkably reduced by the method.

Description

technical field [0001] The invention relates to the field of isophthalic acid production, in particular to a method for dehydrating acetic acid in the production process of isophthalic acid. Background technique [0002] Since 2009, the self-developed technology has successfully increased the production capacity of isophthalic acid (PIA) production process from 25,000 tons / year to 50,000 tons / year. With the adoption of new technology equipment, the energy consumption, The material consumption is also significantly reduced, for example, the consumption of m-xylene is reduced by 2.4%, the consumption of acetic acid is reduced by 21%, and the comprehensive energy consumption is reduced by about 30%, which greatly improves the economic benefits and market competitiveness of the PIA production process. [0003] Although with the optimization of the production process, various indicators continue to improve, and the level of energy consumption and material consumption continues to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/46C07C53/08C07C67/54C07C69/14C07C7/06C07C15/08
CPCC07C51/46C07C67/54C07C7/06C07C53/08C07C69/14C07C15/08
Inventor 李军良王运仓时龙辉严明汪复生宋洋李艳李京辉李成承
Owner CHINA PETROLEUM & CHEM CORP