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Recycling and separating process of heavy component residual liquid in carbonylation production process of acetic acid

A heavy component and carbonylation technology, which is applied in the separation/purification of carboxylic acid compounds, the preparation of organic compounds, organic chemistry, etc., can solve the problems of resource waste, environmental pollution, etc., and achieve simple process, efficient recovery and separation process, increase The effect of resource utilization

Active Publication Date: 2011-07-20
NANJING CHANGJIANG JIANGYU PETROCHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After analysis, it can be known that for the acetic acid production enterprises with an annual output of 100,000 tons, nearly 1,000 tons of acetic acid heavy component waste liquid is produced on average every year. At present, each production enterprise at home and abroad does not have a feasible recycling method, so that the waste liquid is directly used. Discharge or incineration, not only caused a waste of resources but also caused serious pollution to the environment

Method used

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  • Recycling and separating process of heavy component residual liquid in carbonylation production process of acetic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Such as figure 1 As shown in the process flow diagram, the heavy acetic acid waste liquid is entered into the wiped film evaporator 2 from the raw material 1 at a flow rate of 3.8ml / min, the vacuum system 6 is opened, and the pressure of the wiped film evaporator 2 system is controlled at 3.0KPa. The plate rotation speed is adjusted to 30 rpm, the outlet temperature of the liquid at the bottom is 145°C, the heavy polymer component 4 is discharged from the bottom to the buffer tank 3, and then the residual liquid 13 of the tower kettle is removed from the boundary area, and the acetic acid content is less than 200ppm; at the same time, the light component at the top After being condensed by the condenser 5, the fraction enters the light component intermediate tank 7, and then enters the batch rectification unit 8 for reflux ratio operation. The system pressure is controlled at 5.0KPa. After about 1 hour after the total reflux is stabilized, the specific operations are as ...

Embodiment 2

[0028] Such as figure 1 As shown in the process flow diagram, the heavy acetic acid waste liquid is entered into the wiped-film evaporator 2 from the raw material 1 at a flow rate of 4.5ml / min, and the vacuum system 6 is opened to control the pressure of the wiped-film evaporator 2 system at 4.0KPa. The plate rotation speed is adjusted to 40 rpm, the outlet temperature of the liquid at the bottom is 150°C, the heavy polymer component 4 is discharged from the bottom to the buffer tank 3, and then the residual liquid 13 of the tower kettle is discharged outside the boundary area, and the acetic acid content is less than 420ppm; at the same time, the light component at the top After being condensed by the condenser 5, the fraction enters the light component intermediate tank 7, and then enters the batch rectification unit 8 for reflux ratio operation. The system pressure is controlled at 6.0KPa. After about 1.5 hours after the total reflux is stabilized, the specific operations ar...

Embodiment 3

[0035] Such as figure 1 As shown in the process flow diagram, the heavy acetic acid waste liquid is entered into the wiped film evaporator 2 from the raw material 1 at a flow rate of 4ml / min, the vacuum system 6 is opened, the pressure in the wiped film evaporator 2 is controlled at 5.3KPa, and the scraper The rotating speed is adjusted to 35 rpm, the outlet temperature of the liquid at the bottom is 146°C, the heavy polymer component 4 is discharged from the bottom to the buffer tank 3, and then the residual liquid 13 of the tower kettle is discharged outside the boundary area, and the acetic acid content is less than 200ppm; at the same time, the light component at the top After being condensed by the condenser 5, it enters the light component intermediate tank 7, and then enters the batch rectification unit 8 for reflux ratio operation. The system pressure is controlled at 5.1KPa. After about 1.2 hours after the total reflux is stable, the specific operation is as follows: ...

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Abstract

The invention discloses a recycling and separating process of heavy component residual liquid in the carbonylation production process of acetic acid, belonging to the separation technical field of the organic chemical engineering. The process comprises the following steps: firstly, the residual liquid is sent to a wiped film evaporator to perform reduced pressure operation and remove high polymer heavy component; and secondly, light component enters a batch distillation device to obtain the products such as acetic acid, acetoxyacetic acid and ethylene glycol diacetate through separation and purification. The invention adopts the recycling and separating process of the acetic acid heavy component residual liquid; the flow is simple, the process is easy to operate; after the high polymer heavy component is removed, the residual liquid meets the requirements of environmental protection treatment; and the products with high added value can be effectively recycled, the recovery rate is more than 90% and the process is an efficient and environmentally friendly recycling and separating process.

Description

technical field [0001] The invention belongs to the technical field of organic chemical separation, and relates to a method for recovering waste liquid in chemical production, in particular to a process for recovering and separating heavy component raffinate discharged in the carbonylation process of producing acetic acid. Background technique [0002] Acetic acid is an important basic organic chemical raw material. It is also an important organic chemical raw material that has developed rapidly in the world in recent years. It is mainly used in the production of vinyl acetate monomer, cellulose acetate, acetic anhydride and metal acetates. As of the end of 2009, there were more than 90 acetic acid production enterprises in my country, with a production capacity of 1.2 million t / a. Among them, the production of acetic acid by carbonylation is the mainstream of acetic acid production due to its mild reaction conditions, high yield and low production cost. craft. According to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/44C07C53/08C07C67/54C07C69/16C07C69/14
Inventor 唐斌迪建东张积慧华超曹文林白芳
Owner NANJING CHANGJIANG JIANGYU PETROCHEM CO LTD
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