Extractive agent for recycling acetic acid in dilute acetic acid

A technology of dilute acetic acid and extractant, applied in liquid solution solvent extraction, separation/purification of carboxylic acid compounds, organic chemistry, etc., can solve the problems of low separation efficiency and high energy consumption

Inactive Publication Date: 2008-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is that existing technology has the problem of low separation efficiency and high energy consumption in the process of reclaiming acetic acid in dilute acetic acid, and a new extraction agent for reclaiming acetic acid in dilute acetic acid is provided

Method used

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  • Extractive agent for recycling acetic acid in dilute acetic acid
  • Extractive agent for recycling acetic acid in dilute acetic acid
  • Extractive agent for recycling acetic acid in dilute acetic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] according to figure 1 Shown: the extraction tower is filled with 3 mm × 3 mm θ ring wire mesh packing, the effective height is 1.2 meters, the weight percentage of acetic acid in the dilute acetic acid solution is 3.3%, the percentage of water is 96.7%, the dilute acid solution and the extraction agent Both enter the top and bottom of the extraction tower at a flow rate of 0.7 kg / h, the extraction temperature is 35°C, the air compressor pressure is 150kPa, and the pulse frequency of the solenoid valve is 0.05 seconds -1 , change the composition of the extractant, and analyze the extract phase and raffinate phase after the operation is stable.

[0019] 1) When the weight percentage of extractant: mixed amine (wherein tributylamine and tripentylamine respectively account for 35% and 65%, hereinafter the same) is 32.5%, n-octanol is 48.7%, kerosene fraction above 160 ℃ is At 18.8%, the extraction result is:

[0020] Extraction result

[0021]

[0022] 2) When the mix...

Embodiment 2

[0029] Keep other conditions as in Example 1, change the type of n-alkanol in the extractant component, and its weight percentage is still 48.7%, after the system is stable, analyze the extract phase and the raffinate phase.

[0030] 1) When n-alkanol is n-heptane, the extraction result is:

[0031] Extraction result

[0032]

[0033] 2) When n-alkanol is n-nonanol, the extraction result is:

[0034] Extraction result

[0035]

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Abstract

The invention relates to extracting agent for recycling acetic acid from diluted acetic acid, and solves the problem that the extracting efficiency of the prior art is low. The invention has the technical proposal that the extracting agent includes the components by weight percentage: at least one kind of tertiary amine of 5 to 70 percent with 6 to 20 carbon atoms, alphanol of 10 to 80 percent and kerosene of 5 to 60 percent. Besides, the extracting agent is applicable for the industrial production including recycling of acetic acid from wasted aldehyde water and extracting and refining acetic acid in the methyl acetate hydrolysis technique.

Description

technical field [0001] The invention relates to an extractant for recovering acetic acid in dilute acetic acid. Background technique [0002] Acetic acid-water mixture is usually separated by rectification, extractive rectification, azeotropic rectification and other methods, but when these methods are used for the separation of dilute acetic acid, the energy consumption is too large. Therefore, the commonly used method for the treatment of dilute acetic acid aqueous solution is as follows: [0003] 1. Sodium acetate method: Use sodium hydroxide to neutralize acetic acid in dilute acid solution to generate sodium acetate, then use it as a low-pressure boiler water supply to evaporate its concentration to 15% to 25%, and finally add concentrated sulfuric acid to the concentrated salt converted to acetic acid. [0004] The drawback of this method is that the quality of the sodium acetate that reclaims is poor, and sodium hydroxide is expensive, uneconomical. Currently, this...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/48C07C53/08B01D11/04
Inventor 钟禄平肖剑钟思青顾军民陈秀宏
Owner CHINA PETROLEUM & CHEM CORP
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