Separation and extraction method of taurine

Abstract

The invention relates to a separation and extraction method of taurine. The separation and extraction method of taurine comprises following steps: oxirane is reacted with sodium bisulfite aqueous solution so as to obtain a sodium hydroxyethyl sulfonate solution; inorganic ammonia is dissolved into the sodium hydroxyethyl sulfonate solution, an obtained mixture is delivered into a pressure reactor for ammonification, and a sodium taurate aqueous solution is obtained via flash distillation; the sodium taurate aqueous solution is subjected to blending, and is reacted with neutralizer sulfur dioxide in a neutralization reactor until a reaction endpoint is reached. According to the separation and extraction method, at a relatively temperature, taurine solubility is relatively low, crystals are fine, and density is low; sodium sulfite is low in solubility and possesses crystal water, crystals are coarse, and density is high; sodium bisulfate is high in solubility, and crystallization is not easily caused at low temperature; so that separation of taurine with inorganic salts is realized via settling separation and sieve filtering at low temperature, excellent effects are achieved; by products, including sodium sulfite and sodium bisulfate, which are high in additional value are obtained; and recycling can be realized. The separation and extraction is safe and friendly to the environment, and can be used for industrialized production; cost is low; yield is high; quality is high; and energy consumption is low.

Description

technical field [0001] The invention relates to a method for separating and extracting taurine, which belongs to the field of fine chemicals. Background technique [0002] Taurine is also known as 2-aminoethanesulfonic acid, and its English name is Taurine. It is a sulfur-containing non-protein amino acid, which was first isolated from taurine, hence the name. This product exists in a free state in the body and does not participate in the synthesis of proteins in the body, but it is closely related to the metabolism of cystine and cysteine. The activity of cysteine ​​sulfite carboxylase (CSAD) that synthesizes taurine in the human body is low, and it mainly depends on the intake of taurine in food to meet the needs of the body. Taurine can improve nerve conduction and visual function, prevent cardiovascular disease, affect lipid absorption, improve endocrine status, enhance human immunity, affect glucose metabolism, inhibit the occurrence and development of cataract, impro...

AI Technical Summary

Problems solved by technology

[0007] But in the technology of existing oxirane method synthetic taurine, all is to add sulfuric acid to neutralize, utilize the solubility characteristic of taurine and sodium sulfate to repeatedly carry out cooling crystallization centrifugation and concentrated hot filtration to obtain taurine and free respectively Sodium sulfate water, in this process, the obtained taurine mixed with sodium sulfate affects the quality of taurine, and the obtained sodium sulfate mixed with taurine affects the yield; concentrated at a higher temperature, heated for a long time, taurine has Decomposition; repeated concentration and centrifugation, low efficiency, high energy consumption, and high cost; the final generation of salty waste liquid is more difficult to handle, causing environmental pollution

When centrifuging taurine, the temperature is above 30°C. The taurine contained in the saline wastewater is difficult to extract, and the sodium isethionate contained is also difficult to recover, which is not conducive to the improvement of the total yield.

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