Method for utilizing mixed waste acids in acetic acid production device

A production device and technology of acetic acid, which is applied in the utilization field of mixed waste acid, can solve the problems of excessive steam and high equipment requirements, and achieve the effect of reducing pollution and reducing treatment costs

Active Publication Date: 2015-03-04
TIANJIN BOHUA YONGLI CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large amount of steam consumed in the process of this process, the equipment requirements are relatively high, and a large amount of organic heavy components of acetic acid and propionic acid will be produced in the process of treatment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) The waste acid material in the production process of the acetic acid plant is pumped into the falling film evaporator to evaporate, and the organic salt (potassium acetate, potassium propionate) and high boiling point organic matter (methyl acetate, potassium propionate) in the waste acid are removed. Acetaldehyde) to obtain acetic acid and propionic acid vapor, wherein the mass content of acetic acid reaches 28%, and the mass content of propionic acid reaches 72%. The acetic acid and propionic acid vapor are condensed, and then the condensate is sent to the receiving tank; (2) the acetic acid and propionic acid condensate are pumped into the reactor from the receiving tank, then calcium carbonate is added to the reactor, the reaction temperature in the reactor is controlled at 40°C, when the pH of the solution after the reaction is 8, it can be determined that the reaction reaches the end point, The solution after the reaction is taken out; the steam at the top of t...

Embodiment 2

[0019] (1) The waste acid material in the production process of the acetic acid plant is pumped into the falling film evaporator to evaporate, and the organic salt (potassium acetate, potassium propionate) and high boiling point organic matter (methyl acetate, potassium propionate) in the waste acid are removed. Acetaldehyde) to obtain acetic acid and propionic acid vapor, wherein the mass content of acetic acid reaches 32%, and the mass content of propionic acid reaches 68%. The acetic acid and propionic acid vapor are condensed, and then the condensate is sent to the receiving tank; (2) the acetic acid and propionic acid condensate are pumped into the reactor from the receiving tank, then calcium carbonate is added to the reactor, the reaction temperature in the reactor is controlled at 60°C, when the pH of the solution after the reaction is 8.5, it can be determined that the reaction reaches the end point, The solution after the reaction is taken out; the steam at the top of...

Embodiment 3

[0021] (1) The waste acid material in the production process of the acetic acid plant is pumped into the falling film evaporator to evaporate, and the organic salt (potassium acetate, potassium propionate) and high boiling point organic matter (methyl acetate, potassium propionate) in the waste acid are removed. acetaldehyde) to obtain acetic acid and propionic acid vapor, wherein the mass content of acetic acid reaches 40%, and the mass content of propionic acid reaches 60%. The acetic acid and propionic acid vapor are condensed, and then the condensate is sent to the liquid receiving tank; (2) the acetic acid and propionic acid condensate are pumped into the reactor from the receiving tank, then calcium carbonate is added to the reactor, the reaction temperature in the reactor is controlled at 80°C, when the pH of the solution after the reaction is 9, it can be determined that the reaction reaches the end point, The solution after the reaction is taken out; the steam at the t...

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PUM

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Abstract

The invention discloses a method for utilizing mixed waste acids in an acetic acid production device, which comprises the following steps: (1) pumping waste acid materials into a falling film evaporator, evaporating to obtain acetic acid and propionic acid vapor, condensing the acetic acid propionic acid vapor, and sending the condensate into a receiver tank; (2) pumping the acetic acid and propionic acid condensate into a reactor from the receiver tank, adding calcium carbonate into the reactor, reacting until the pH value of the reaction solution is 8-9, and taking out the solution; (3) filtering the reaction solution, sending part of the filtrate into a fluidized bed dryer, drying to obtain a calcium acetate and calcium propionate salt mixture, sending the calcium acetate and calcium propionate salt mixture into the other part of filtrate to form a calcium acetate and calcium propionate saturated solution; and (4) sending the saturated solution into a crystallizer, heating to precipitate calcium acetate crystals, and lowering the temperature to precipitate calcium propionate crystals. The method implements recovery of propionic acid and acetic acid in the waste acids.

Description

technical field [0001] The invention relates to a method for utilizing mixed waste acid in a production device, in particular to a method for utilizing the mixed waste acid produced in the process of an acetic acid production device. Background technique [0002] Process for synthesizing acetic acid by methanol low-pressure carbonylation. The process uses methanol and carbon monoxide as raw materials, adopts a rhodium-iodine catalytic system, and generates acetic acid with a mass fraction as high as 99.8% through a homogeneous mixed reaction. Due to the particularity of the catalytic system of this process, there are many main and side reactions and various by-products, mainly including methyl acetate, potassium iodide, 2-ethyl crotonaldehyde, 2-ethyl butyraldehyde and their aldol condensation products. Wherein the content of propionic acid in the by-product is more than 60%, and the content of acetic acid accounts for more than 30%. In the published patent CN1995001, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C53/122C07C53/10C07C51/41C07C51/43
CPCC07C51/41C07C51/43
Inventor 张思学李亚斌李治水岑建军
Owner TIANJIN BOHUA YONGLI CHEM IND
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