Method for recovering acetone from dilute acetone water solution by reduced-pressure steam stripping type rectification

An acetone aqueous solution and stripping technology, which is applied in the field of acetone recovery, can solve the problems of high energy consumption, capital construction equipment and operating costs, and achieve the effects of reducing capital construction and equipment costs, height, and rectification operating costs.

Active Publication Date: 2011-07-06
ZHUHAI CELLULOSE FIBERS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the current rectification process of diacetone aqueous solution has the defects of high energy consumption, infrastructure, equipment and operating costs

Method used

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  • Method for recovering acetone from dilute acetone water solution by reduced-pressure steam stripping type rectification
  • Method for recovering acetone from dilute acetone water solution by reduced-pressure steam stripping type rectification
  • Method for recovering acetone from dilute acetone water solution by reduced-pressure steam stripping type rectification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The acetone-water solution with a flow rate of 100t / hr and a mass concentration of acetone of 10% is exchanged through the heat exchanger 1 and the discharge liquid of the tower kettle 4, and the allycetone-water solution is heated to 92°C. Enter in the rectifying tower under the situation, the tray number of rectifying tower 5 is 21, and feed position is 11 # At the tray; the steam (98.5% acetone, 1.5% water) with a temperature of 53.6°C at the top of the tower is condensed to 40°C through the condenser 2 and enters the liquid storage tank 3, and a part of it (98.5% acetone, 1.5% water) is used as the tower The top product is collected, and another part is refluxed in the rectifying tower as reflux liquid, and wherein mass reflux ratio (product amount / reflux flow rate) is 1.5: 1, and the operating pressure of tower top is 0.09MPa; Rectifying tower 5 adopts stripping type Direct steam heating, the superheated steam with a flow rate of 7.760t / hr, a temperature of 172°C a...

Embodiment 2、3

[0024] The treatment method of Examples 2-3 is the same as that of Example 1, and the process parameters are shown in Table 1; Comparative Examples 4, 5, and 6 are respectively comparative examples of Examples 1, 2, and 3, and the process parameters are shown in Table 1.

[0025] Comparative examples 4, 5, and 6 in Table 1 are operation examples using conventional rectification (atmospheric pressure, reboiler heating) operation and the presence of a constant concentration zone. As can be seen from Table 1, the vacuum stripping rectification operation can significantly reduce the steam consumption compared with the conventional rectification operation; Compared with the distillation operation, the number of theoretical plates is reduced by 9-13 blocks, which can greatly reduce the construction cost of the distillation tower.

[0026] Table 1

[0027]

[0028] Remarks: H / F=steam consumption (t / hr) / feed amount (t / hr)

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Abstract

The invention discloses a method for recovering acetone from a dilute acetone water solution by reduced-pressure steam stripping type rectification, which comprises steps as follows: an acetone-containing dilute solution and a high-temperature kettle liquid discharged from a tower kettle in a rectifying tower exchange heat through a heat exchanger, and the acetone-containing dilute solution enters the rectifying tower among 8#-16# tower plates of the rectifying tower after the temperature reaches 85-95 DEG C; the operating pressure intensity of the tower top is 0.07-0.09 MPa; the operating pressure intensity of the tower kettle is 0.120-0.130 MPa; and after the tower top distillate of the rectifying tower is cooled to 40-55 DEG C by a condenser, part of the distillate is recovered as an acetone product, and part of the distillate is used as reflux, wherein the reflux ratio of reflux mass to product mass is controlled within (0.5-6.6):1. The invention decreases the consumption of cooling water for steam on the top of the condensing tower as well as the consumption of tower bottom steam for heating, thereby lowering the operating cost for rectification. The invention has the characteristics of high accuracy, high sensitivity, high speed, convenience and the like, and can be easily implemented in industry.

Description

field of invention [0001] The invention relates to the recovery of acetone, in particular to a method for rectifying and recovering acetone in an aqueous solution of dilute acetone. Background technique [0002] As a good organic solvent, acetone is widely used in chemical, pharmaceutical and other industries. Due to the low boiling point and strong volatility of acetone, acetone exists in large quantities in the waste gas generated during the production process, causing great harm to the environment and human health. Governments of various countries have formulated corresponding regulations to limit the emission of acetone. The acetone in the waste gas is recovered to make it discharge up to the standard, which can reduce the pollution to the environment and the harm to the human body, and can also reduce the consumption of acetone and save the operating cost. [0003] The explosion limit of acetone in the air is 2.5% to 12.8% (volume ratio). For safety reasons, the concen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C49/08C07C45/82
Inventor 江燕斌廉磊高前进查擎美刘强黄毅松
Owner ZHUHAI CELLULOSE FIBERS CO LTD
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