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Process for the recovery of betaines from electrodialysis waste streams

A technology of betaine and electrodialysis, applied in the direction of purification using electricity, electrodialysis, and purification using physical methods, can solve the problems of reduced yield, poor biodegradability, and waste streams that cannot be properly treated. Achieve the effect of increasing productivity and significant economic significance

Active Publication Date: 2012-01-04
LONZA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Product losses in the waste stream due to, for example, diffusion and / or osmotic pressure reduce the yield of the ED process and contribute to the organic freight (total organic carbon (TOC)) of the waste stream
Consequently, waste streams are often not properly treated at biowaste stream treatment plants if the product is poorly biodegradable, requiring a subsequent incineration step that is too costly for industrial production

Method used

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  • Process for the recovery of betaines from electrodialysis waste streams
  • Process for the recovery of betaines from electrodialysis waste streams
  • Process for the recovery of betaines from electrodialysis waste streams

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Recovery of 4-butylbetaine (CAS-Nr. 407-64-7) from ED waste stream

[0027] Waste streams from industrial scale ED units were treated in a nanofiltration pilot plant. Using membranes purchased from Kochmembranes with an area of ​​7.9m 2 500 kg of the waste stream was concentrated to 126 kg with a TFC-SR-3 type four inch spiral wound membrane module. The starting temperature was 23°C and was adjusted to 44°C during the experiment. The initial pressure was 14 bar and was adjusted up to 30 bar during the test. Samples were taken from the retentate (concentrate) and permeate (waste water). The concentration of butyl betaine increased from the initial 2.6 wt% to 8.4 wt%. During the concentration stage, the retention of butyl betaine was calculated to be 80% to 100%. During the concentration stage, the retention of 4-hydroxybutyric acid was calculated to be between 30% and 95%. During the test, the membrane did not retain sodium chloride.

[0028] Based on t...

Embodiment 2

[0029] Example 2: Recovery of L-carnitine (CAS-Nr. 541-15-1) from the ED waste stream

[0030] The waste stream from the laboratory-scale ED unit described above was treated in a laboratory-scale nanofiltration unit. Use a Nitto Denko with a membrane area of ​​0.02m 2 The membrane module of the NTR-729HG S4F type flat sheets membrane (flat sheets membrane) concentrates the waste stream of 2.648kg to 0.835kg. During the test, the temperature was 23°C. The pressure is 32 bar. Samples were taken from the retentate (concentrate) and permeate (waste water). The concentration of L-carnitine in the retentate increased from an initial 1.3 wt% to 3.3 wt%. During the concentration phase, the retention of L-carnitine was calculated to be 80% to 100%. During the concentration stage, the retention of (E)-4-hydroxybutenoic acid was calculated to be between 30% and 95%. During the test, the membrane did not retain sodium chloride.

[0031] Based on the results from the nanofiltration ...

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Abstract

The present invention discloses a process for the recovery of product from electrodialysis (ED) waste streams, whereby said waste streams are treated with a pressure driven membrane process.

Description

technical field [0001] The present invention discloses a process for the recovery of betaine from an electrodialysis waste stream from a betaine production process by pressure driven membrane processing. Background technique [0002] The synthesis of betaines is often accompanied by the production of stoichiometric amounts of organic or inorganic salts in the reaction mixture. The product is usually further separated from the salt by various purification methods such as distillation, extraction, crystallization, electrodialysis or other unit operations. Every purification / isolation method inevitably suffers from product loss. [0003] Electrodialysis (ED) is a membrane technique used to purify organic products in liquid mixtures. ED can be used in any way to reduce the salt concentration in the mixture and moreover can be used to selectively remove organic compounds contained in the liquid solution. The driving force for the separation is the transmembrane electric field....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/58B01D61/44B01D61/42C07C227/40C12P13/00C13B20/16C13B20/18
CPCC13B20/18C07C227/40B01D61/422B01D61/147B01D61/44C02F1/4693C02F1/441B01D61/58C02F1/44C13B20/165B01D61/145C02F2103/36B01D61/027B01D61/025C02F1/442B01D61/02C02F1/444C07C229/12C07C229/22C12P13/00
Inventor 马库斯·比克尔米格尔·卡罗康
Owner LONZA LTD