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Method for separating and purifying dicarboxylic acid in DBA waste fluid

A binary organic acid, separation and purification technology, applied in the separation/purification of carboxylic acid compounds, liquid solution solvent extraction and other directions, can solve the problems of unsuitability for large-scale industrial production, high energy consumption, long reaction time, etc. The effect of mild conditions, good selectivity and low labor intensity

Inactive Publication Date: 2015-10-21
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have high energy consumption and long reaction time, and are not suitable for large-scale industrial production.

Method used

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  • Method for separating and purifying dicarboxylic acid in DBA waste fluid
  • Method for separating and purifying dicarboxylic acid in DBA waste fluid
  • Method for separating and purifying dicarboxylic acid in DBA waste fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A method for separating and purifying binary organic acids in DBA waste liquid, comprising the following extraction step (I):

[0052] (i) Utilize secondary octanol to extract the binary organic acid in the DBA waste liquid, compare in the extraction step (compared in the present invention refers to the volume ratio of organic phase and aqueous phase, expresses with O / W, no longer Repeat one by one) are 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0 respectively, and the speed is 600r / min [when the speed is lower than 600r / min, the extraction rate and distribution ratio will increase with the increase of the speed ; When the rotation speed is higher than 600r / min, the extraction rate and distribution ratio are basically unchanged. This is because when the rotation speed is lower than 600r / min, as the rotation speed increases, the contact area between the aqueous phase and the organic phase increases, and the mass transfer is accelerated, resulting in an increase in the extracti...

Embodiment 2

[0057] The difference between this example and Example 1 is that the ratio is 2:1, the extraction time is 10s, 30s, 1min, 3min, 5min, and 7min, respectively, and the influence of extraction time on the extraction rate and distribution ratio is studied. The results are as follows image 3 , Figure 4 shown.

[0058] From image 3 , Figure 4 It can be seen that both the extraction rate and the distribution ratio increase with the increase of the extraction time. When the extraction time reaches 5 minutes, the extraction rate and the distribution ratio basically do not change with the increase of the extraction time, indicating that the extraction has reached equilibrium at this time. , so the best extraction reaction time in this experiment is 5min.

Embodiment 3

[0060] The difference between this embodiment and Example 1 is: the ratio is 2:1, the raw material liquid is extracted multiple times by secondary octanol, the volume of the loaded organic phase is accurately measured, and the impact of the number of extractions on the volume of the loaded organic phase is studied. The result Such as Figure 5 shown.

[0061] From Figure 5 It can be seen that with the increase of the number of extractions, the volume of the loaded organic phase first decreases and then basically remains the same. Because as the number of extractions increases, the loaded organic phase will remain on the container wall during the extraction process, and the number of extractions will increase, and the residual amount will also increase, resulting in a decrease in the volume of the organic phase. In order to reduce the residue of the loaded organic phase, the number of extractions should be reduced as much as possible, that is, the number of extraction stages...

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Abstract

The invention discloses a method for separating and purifying dicarboxylic acid in a DBA waste fluid. The method comprises the following extraction steps (I): (i) utilizing an organic phase to extract the dicarboxylic acid in the DBA waste fluid, wherein the organic phase is one or more of alcohol, ketone, ether, ester and amine, and the alcohol is one or more of n-amyl alcohol, sec-octyl alcohol, hexyl alcohol, cyclohexanol and decyl alcohol; the ketone is one or more of methyl ethyl ketone, 3-pentanone, methyl isobutyl ketone (MIBK), 3-octanone and cyclohexanone; the ethers is isopropyl ether; the ester is one or more of P204, P507 and TBP; and the amine is one or more of TOA, N235 and N,N-di-n-butyl valeramide; and (ii) separating the loaded organic phase and an extraction raffinate. The method is mild in process reaction condition, good in selectivity, low in labor intensity and little in environmental pollution, and is suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of extraction and separation. More specifically, it relates to a method for separating and purifying binary organic acids in DBA waste liquid. Background technique [0002] The application fields of the three kinds of dibasic acids in DBA waste liquid are very wide. Among them, succinic acid can be used in surfactants, medicines, spices, green solvents, plastics, food and other fields. It has the ability to synthesize five-membered heterocyclic compounds and degradable The US Department of Energy lists succinic acid as one of the 12 most valuable bio-based chemicals. When succinic acid is used as a foaming agent, ion chelating agent, acidifier, etc., it has a huge market share and high economic benefits. The world's demand for succinic acid can reach 27 million tons per year. [0003] Glutaric acid is an important raw material for the production of glutaric anhydride in the chemical industry. It is widely ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D11/04C07C51/48C07C55/10C07C55/12C07C55/14
Inventor 魏琦峰郭敬敬任秀莲陈泳兴王晓飞
Owner HARBIN INST OF TECH AT WEIHAI
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