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Method for recovering organic acid from organic solvent

A technology of organic solvents and organic acids, applied in the separation/purification of carboxylic acid compounds, electrodialysis, etc., can solve the problems of increased cost and low concentration of product liquid, and achieve low material consumption and energy consumption, good operation stability, and improved Effect of Current Density and Current Efficiency

Inactive Publication Date: 2005-01-26
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

American Miles company uses organic amine extractant and hot water as stripping agent to realize a complete organic acid extraction process. Compared with the currently widely used calcium salt method, this process has higher yield, less material consumption and by-products , but the concentration of the product solution is very low, further concentration will increase the cost a lot

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The size of the two-phase chamber of the electrodialysis device is 120mm×50mm×5mm, and the membrane area is 60cm 2 , use 0.730M citric acid aqueous solution as the receiving phase, the organic solvent is trialkylamine, wherein the initial concentration of citric acid is 0.561M, and the aqueous phase for preparing the emulsion is 0.782M sodium citrate aqueous solution, when preparing the emulsion The oil-water ratio is 1:3 (v / v), the inlet flow of the emulsion is 3.08mL / min, the inlet flow of the receiving phase is 3.39mL / min, the current intensity is 0.504A, and the voltage is 18V. After continuous operation reaches a steady state, the anode chamber The outlet is 0.775M citric acid aqueous solution, and the flow rate is 3.58mL / min. The current efficiency is 77.0%.

Embodiment 2

[0038] The size of the two-phase chamber of the electrodialysis device is 120mm×50mm×5mm, and the membrane area is 60cm 2 , use the fumaric acid aqueous solution of 0.737M as the receiving phase, the organic solvent is trialkylphosphine oxide, wherein the initial concentration of fumaric acid is 0.561M, and the aqueous phase for preparing the emulsion is 0.782M sodium fumarate aqueous solution, When preparing the emulsion, the oil-water ratio is 1:1 (v / v), the inlet flow of the emulsion is 3.08mL / min, the flow of the receiving phase inlet is 3.48mL / min, the current intensity is 0.498A, and the voltage is 19.3V. After the state, the outlet of the anode chamber is a 0.774M fumaric acid aqueous solution, and the flow rate is 3.55mL / min. The current efficiency was 59.0%.

Embodiment 3

[0040] The size of the two-phase chamber of the electrodialysis device is 120mm×50mm×5mm, and the membrane area is 60cm 2 , using 3.537M oxalic acid aqueous solution as the receiving phase, the organic solvent is tributyl phosphate, wherein the initial concentration of oxalic acid is 0.561M, and the aqueous phase used to prepare the emulsion is 3.582M sodium oxalate aqueous solution, and the oil-water ratio when preparing the emulsion is 1:1 (v / v), the inlet flow rate of the emulsion is 3.08mL / min, the flow rate at the inlet phase of the receiving phase is 3.50mL / min, the current intensity is 1.10A, and the voltage is 23.6V. After continuous operation reaches a steady state, the outlet of the anode chamber is 0.824M oxalic acid aqueous solution, the flow rate is 3.76mL / min. The current efficiency is 76.2%.

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Abstract

The invention discloses a method for reclaiming organic acid from organic solvent in chemical mass transfer separation technology field. the organic solvent loaded with organic acid is mixed with aqueous solution of the organic acid salt and they are produced into latex liquid, then the latex and the aqueous solution containing the organic acid enters the negative chamber and positive chamber of the electrodialysis device, it realizes the synchronous extraction and condense of organic acid in the aqueous solution through electric transfer and electrode reaction. Compared with current technology, it has a high energy utilization rate, and low cost and side product.

Description

technical field [0001] The invention relates to the technical field of chemical mass transfer and separation, in particular to a method for recovering organic acids from organic solvents. Background technique [0002] Organic acid is a kind of basic chemical raw material. Fermentation method is one of the important methods to produce organic acid. However, the crude liquid produced by fermentation method contains a lot of impurities, and the concentration and purity of organic acid are relatively low. To obtain commercially valuable products, Must be separated and concentrated. [0003] Solvent extraction is well suited for the selective extraction of organic acids from low-concentration aqueous solutions. American Miles company uses organic amine extractant and hot water as stripping agent to realize a complete organic acid extraction process. Compared with the currently widely used calcium salt method, this process has higher yield, less material consumption and by-produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/42C07C51/42
Inventor 吕阳成骆广生易莎莎
Owner TSINGHUA UNIV
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