Process and device for purifying and recovering acetic acid waste liquid

An acetic acid and waste liquid technology, which is applied in the separation/purification of carboxylic acid compounds, organic chemistry and other directions, can solve the problems of large floor space, complicated process flow, inability to directly obtain acetic acid, etc., and achieve the effect of reducing production

Pending Publication Date: 2019-08-30
YICHANG SUPENG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above-mentioned patents either cannot directly obtain high-purity acetic acid, or have the disadvantages of high equipment investment cost, strict operation requirements, large floor area, complicated process flow, and high energy consumption.

Method used

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  • Process and device for purifying and recovering acetic acid waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A high-purity acetic acid rectification device. The acetic acid rectification tower 1 is connected to the rectification vessel 2, the rectification vessel 2 is connected to the top-level condenser 3, the top-level condenser 3 and the top-level secondary condenser 4 Connected, the top secondary condenser 4 is connected to the reflux ratio controller 5, the reflux ratio controller 5 is connected to the rectification vessel 2, the reflux ratio controller 5 is connected to the acetic acid waiting tank 7, the acetic acid waiting tank 7 and the acetic acid product tank 9Connect.

[0027] The acetic acid waiting tank 7 is connected to the front fraction tank 6. The bottom part of the front fraction tank 6 is connected to two paths, one is connected to the intermediate tank 10, and the other is connected to the acetic acid rectification tower 1.

[0028] The bottom of the acetic acid waiting tank 7 is connected to the acetic acid rectifying tower 1.

[0029] The top of the front frac...

Embodiment 2

[0031] The process performed by the above device is:

[0032] 1. Check whether the equipment, pipelines, and valves are in good condition, whether the opening and closing positions are in the correct position, and adjust the valves to normal working conditions.

[0033] 2. Open the material inlet valve of the distillation kettle, turn on the feed pump, and pump materials into the distillation kettle. Control the liquid level of the distillation kettle. At this time, the feed dilute acetic acid solution is about 2.6m3. The analysis and detection of the feed material acetic acid concentration is 78%, and the feed pump is closed according to the normal operation steps, and the inlet valve is closed.

[0034] 3. Start to feed in 0.8MPa saturated steam, control the steam flow to 190 kg / h, and open the steam condensate outlet valve of the jacket of the rectification kettle. The opening and closing degree of the low-pressure steam control valve should be adjusted slowly from small to large...

Embodiment 3

[0041] The specific process operation is shown in Example 2. The feed dilute acetic acid solution is 2.4m3, the concentration is 81%, the steam flow rate is 205 kg / h, the rectification tower kettle operation is 121 ℃, the tower top operation temperature is 99 ℃, and the tower kettle operation pressure is 105KPa , The operating pressure at the top of the tower is 101 KPa, the top temperature of the front fraction is 110°C, the temperature of the top of the acetic acid fraction is 117°C, the reflux ratio of the front fraction is 4:1, and the reflux ratio of the acetic acid fraction is 3:1; the purity of 98.7% is obtained. Acetic acid products.

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Abstract

The invention provides a process and device for purifying and recovering acetic acid waste liquid. An acetic acid rectifying tower is connected with a rectifying kettle, the rectifying kettle is connected with a tower top primary condenser, the tower top primary condenser is connected with a tower top secondary condenser, the tower top secondary condenser is connected with a reflux ratio controller, the reflux ratio controller is connected with the rectifying kettle, the reflux ratio controller is connected with an acetic acid to-be-detected tank, the acetic acid to-be-detected tank is connected with a front fraction tank, and the acetic acid to-be-detected tank is connected with an acetic acid finished product tank. The bottom of the front fraction tank is divided into two channels, one channel is connected to a middle tank, and the other channel is connected to the acetic acid rectifying tower. By adopting the method, the concentration of the acetic acid with low concentration reaches 98.5% after the acetic acid with low concentration is concentrated, the waste liquid which is difficult to treat originally is changed into industrial-grade acetic acid, and thus, good economic benefits are obtained.

Description

Technical field [0001] The invention and a purification process and device for acetic acid waste liquid particularly relate to an industrial-grade acetic acid rectification purification and recovery process and device. Background technique [0002] Acetic acid is an important common chemical raw material or product. Many chemical processes involve the utilization and recovery of acetic acid. The earliest method used ordinary distillation to separate water-acetic acid mixture to recover acetic acid. This method requires more trays and reflux ratio. Large, low recovery rate, high energy consumption, the oldest energy-saving method is to add acetate or substances with similar physical properties to acetic acid for azeotropic distillation. The operating conditions are difficult to master, and the water still contains azeotropic agents and A small amount of acetic acid needs to be recycled, so energy saving is not significant. [0003] At present, methanol low-pressure liquid phase pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C53/08C07C51/44
CPCC07C51/44C07C53/08
Inventor 戴宁吴杰王勇叶敏
Owner YICHANG SUPENG TECH CO LTD
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