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System and method for treating waste liquid generated in carbonyl-process acetic acid synthesis and application of such method

A technology for oxo synthesis and treatment method, which is applied in the field of treatment systems for generating waste liquid in oxo acetic acid, can solve the problems of poor economic benefit, high energy consumption, low product purity, etc., achieves economic and social benefits, and reduces industrial Effects of spent acid

Inactive Publication Date: 2017-06-09
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the defects of complex process, high energy consumption, low product purity, and poor economic benefits in the prior art, the present invention provides a treatment system for waste liquid produced in oxo-acetic acid synthesis, including sequentially connected deweighting unit, an esterification unit and a separation unit, wherein the weight removal unit includes a falling film evaporator, the esterification unit includes an esterification reaction tower, and the separation unit includes a fractionation tower

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] This embodiment provides a treatment system and treatment method for waste liquid produced in oxo-acetic acid synthesis. The system includes: a falling film evaporator, an esterification reaction tower and a fractionation tower connected in sequence.

[0041] The method comprises the steps of:

[0042] 1) The waste liquid of the rectification system product tower in the carbonylation acetic acid process, after testing, contains acetic acid of 50wt% and the propionic acid of 30wt% in the waste liquid, enters this waste liquid from the top of the falling film evaporator, at 3.5KPa Under the pressure, adjust the bottom material outlet temperature to 150.0°C, carry out weight removal, and discharge heavy components from the bottom material outlet to obtain light components;

[0043] 2) Pass the light components obtained in step 1) into the esterification unit, add methanol with a purity of 99.9 wt% to the esterification unit, wherein the mass ratio of methanol to light comp...

Embodiment 2

[0052] This embodiment provides a treatment system and treatment method for waste liquid produced in oxo-acetic acid synthesis. The system includes: a falling film evaporator, an esterification reaction tower and a fractionation tower connected in sequence.

[0053] The method comprises the steps of:

[0054] 1) The waste liquid of the rectification system finished product tower in the carbonylation acetic acid process, after testing, contains the acetic acid of 40wt% and the propionic acid of 35wt% in the waste liquid, enters this waste liquid from the falling film evaporator top, at 3KPa Under pressure, adjust the temperature of the bottom material outlet to 148.0°C, carry out weight removal, and discharge heavy components from the bottom material outlet to obtain light components;

[0055] 2) Pass the light component obtained in step 1) into the esterification unit, add methanol with a purity of 95.9 wt% to the esterification unit, wherein the mass ratio of methanol to ligh...

Embodiment 3

[0070] This embodiment provides a treatment system and treatment method for waste liquid produced in oxo-acetic acid synthesis. The system includes: a falling film evaporator, an esterification reaction tower and a fractionation tower connected in sequence.

[0071] The method comprises the steps of:

[0072] 1) The waste liquid of the rectification system product tower in the oxo synthesis acetic acid process, after testing, contains 60wt% acetic acid and 15wt% propionic acid in the waste liquid, this waste liquid enters from the top of the falling film evaporator, and is heated at 4KPa Under pressure, adjust the temperature of the bottom material outlet to 146.5°C, carry out weight removal, and discharge heavy components from the bottom material outlet to obtain light components;

[0073] 2) Pass the light component obtained in step 1) into the esterification unit, add methanol with a purity of 90.9 wt% to the esterification unit, wherein the mass ratio of methanol to light ...

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Abstract

The invention relates to a system and a method for treating waste liquid generated in carbonyl-process acetic acid synthesis and application of such method. The system comprises a heavy removal unit, an esterification unit and a separation unit which are in sequential connection, wherein the heavy removal unit comprises a falling-film evaporator, the esterification unit comprises an esterification tower, and the separation unit comprises a fractionating tower. The method includes subjecting the waste liquid generated in carbonyl-process acetic acid synthesis to heavy removal; mixing an obtained light component with methyl alcohol for esterification reaction; fractionating mixed liquid to obtain methyl acetate and methyl propionate. As a novel approach for treating the waste liquid generated in carbonyl-process acetic acid synthesis, the method has the advantages that the industrial waste liquid discharged from a carbonyl-process acetic acid synthesis device is reduced greatly, and acetic acid and propanoic acid in the waste liquid are fully used for preparing methyl acetate and methyl propionate both with the purity higher than 97 wt%; waste liquid conversion rate is above 90 wt%, and the content of the acetic acid in the treated waste liquid is decreased to below 500 ppm.

Description

technical field [0001] The invention relates to the field of recovery and utilization of industrial waste acid, in particular to a treatment system, treatment method and application of waste liquid produced in oxo-synthesis of acetic acid. Background technique [0002] Methanol oxo-synthesis of acetic acid is a relatively advanced production process in the world at present. This process uses methanol and carbon monoxide as raw materials, adopts a rhodium-iodine catalytic system, and produces acetic acid with a mass fraction as high as 99.8% through a homogeneous mixed reaction. Due to the complex composition of the waste liquid in the finishing tower of the rectification system, the treatment methods are different. Some domestic manufacturers have two methods for the treatment of rectification waste liquid: one is to discharge the waste liquid with natural gas, which is difficult to implement. The final failure rate is high, which is not conducive to environmental protectio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/14C07C67/08C07C69/24
CPCC07C67/08C07C69/24C07C69/14
Inventor 华超白芳陆平曹文林尤传学
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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