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A kind of purification method of by-product sodium chloride in the production of betaine or betaine hydrochloride

A technology of sodium chloride and betaine, applied in chemical instruments and methods, purification of alkali metal halides, preparation of organic compounds, etc., can solve the problems of lack of high purity of sodium chloride, high cost, waste water discharge, etc., and achieve purity And the effect of high yield, deep separation and high product purity

Active Publication Date: 2021-06-15
山东祥维斯生物科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In the preparation method of the prior art, the separation effect is better when post-treatment adopts means such as ion exchange resin, but the speed is slow, and the industrial demand for large-scale treatment cannot be met, and the cost is high, and a large amount of waste water is discharged when the resin is regenerated; In the case of simple concentration and crystallization, although the post-treatment steps are simple, the separation effect is poor, the efficiency is low, the purity of the obtained betaine is not high, and the by-product sodium chloride is usually discarded, which does not meet the requirements of green process production
[0011] Therefore, the prior art lacks a green and efficient separation and purification method with high purity and no emission of by-product sodium chloride in the production process of betaine / betaine hydrochloride on an industrial scale

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] (1) After the preparation of betaine, the reaction mixture 1.28 kg containing betaine, sodium chloride and a small amount of trimethylamine was concentrated under reduced pressure until crystals were precipitated, and components such as trimethylamine and water were removed to obtain betaine-sodium chloride Crystallization of the mother liquor: preheat the above mother liquor in the preheater to a temperature of 90°C, then evaporate and concentrate in the evaporative crystallizer, the evaporation temperature is 98°C, stop the evaporation and concentration when the volume of the mother liquor is about half, cool to 50°C, 10% volume of isopropanol was added to continue the crystallization to obtain coarse crystals of sodium chloride and the remaining mother liquor, and the solid was separated by filtration. The obtained solid was first washed with 180ml of dehydrated ethanol at a temperature of 60°C, filtered, and then the solid was washed with 120ml of 60°C dehydrated eth...

Embodiment 2

[0061] (1) 132.7kg of the reaction mixture containing betaine, sodium chloride and a small amount of trimethylamine is distilled in a vacuum distillation tower. Separated to obtain betaine-sodium chloride crystallization mother liquor; preheat the above mother liquor in a preheater to a temperature of 95°C, then evaporate and concentrate in an industrial evaporation crystallizer, the evaporation temperature is 95°C, until the volume of the mother liquor is about half Stop evaporation and concentration, cool to 50°C, add 5% volume of isopropanol to continue crystallization to obtain coarse crystals of sodium chloride and the remaining mother liquor, and separate the solid by filtration. The obtained solid was washed with 18L of absolute ethanol at 60°C, filtered, and dried to obtain crude sodium chloride;

[0062] (2) Crystallize the above-mentioned betaine filtrate 1 in an evaporative crystallizer, and recover ethanol and isopropanol solvents, filter the resulting solid, trans...

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Abstract

The present invention relates to the separation and purification method of by-product sodium chloride in the production process of betaine / betaine hydrochloride, comprising reaction mother liquor pretreatment, preliminary separation of crude betaine and sodium chloride, secondary purification separation and betaine merging and purification, Combined with sodium chloride for purification and refining. According to the method of the invention, it is suitable for industrial large-scale separation and purification, does not need to go through procedures such as electrodialysis, and has higher economy and environmental protection. The purified sodium chloride can reach the feed grade standard, realize the recovery and utilization of by-products, and the treatment method is simple without secondary pollution.

Description

technical field [0001] The invention relates to the technical field of separation and purification, in particular to a method for purifying a by-product of sodium chloride produced by chemical products, and in particular to a method for efficiently separating and purifying sodium chloride by-product in the production of causine / betaine hydrochloride. Background technique [0002] Betaine, also known as trimethylglycine, trimethylglycine, etc., is a recognized non-toxic, harmless and non-polluting new multifunctional additive, widely used in food, medicine, daily chemical and other fields. It exists in the roots, stems, leaves and fruits of natural plants in nature, and can be extracted. The extraction process includes ion method, polyethylene-divinyl resin chromatography separation method, which is expensive and difficult to produce on a large scale. Therefore, betaine is usually used chemically synthesis. Betaine is very soluble in water, slightly more soluble in methanol ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C229/12C07C227/08C07C227/40C01D3/14
CPCC01D3/14C07C227/08C07C227/40C07C229/12
Inventor 马琳马兴群王守忠李越张钦太韩强毛秀立
Owner 山东祥维斯生物科技股份有限公司
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