Taurine crystal purification method

Abstract

The invention discloses a taurine crystal purification method. The taurine crystal purification method comprises the steps of firstly, washing taurine coarse crystals crystallized and separated from taurine mother liquor with cold water, putting the taurine coarse crystals into purified water, and dissolving into a taurine solution; and then introducing the dissolved taurine solution into a multistage electrodialysis separation system to remove impurity ions in the solution, and finally introducing the taurine solution with the impurity ions removed into vacuum concentration equipment to be concentrated and recrystallized to obtain high-purity taurine crystals. By means of the mode, the advantages of the recrystallization method and the electrodialysis method can be combined, the thread ofthe purification process is reduced, the purification efficiency is improved, energy consumption is reduced, and the obtained high-purity taurine crystals can meet the requirements of special scenes.

Description

technical field [0001] The invention relates to the field of taurine production, in particular to a method for purifying taurine crystals. Background technique [0002] Taurine, also known as taurine, is a sulfur-containing non-protein amino acid, and its chemical name is 2-aminoethanesulfonic acid. It is a sulfur-containing amino acid with various physiological functions in the human body. It is one of the most important amino acids in the human body for brain development, vision enhancement, anti-inflammation, antipyretic, lowering blood pressure, lowering blood sugar, strengthening liver and gallbladder. Taurine has no toxic and side effects, so developed countries attach great importance to its research and application. In recent years, with the in-depth research on its physiological effects and nutritional value, its application has become very extensive. Taurine is widely used as nutritional health products and food additives abroad. According to reports, the United S...

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Problems solved by technology

At present, the production methods of industrialized taurine in my country mainly include the ethanolamine method and the ethylene oxide method. In the process of using the ethanolamine method, it is necessary to use sulfite to sulfonate the intermediate 2-aminoethanol sulfate to prepare taurine. The crystals formed after the crystallization of taurine contain a certain amount of sulfite. The existence of this sulfite affects the use of taurine in some high-purity fields. Therefore, it is necessary to purify taurine. Currently, the commonly used purification The method is repeated recrystallization and purification, but the simple repeated recrystallization process is relatively long on the one hand, and on the other hand, the waste of resources is relatively large, and the inorganic salts contained in the crystal cannot be completely removed. Use electrodialysis or resin adsorption to carry out multi-stage separation from the mother liquor. However, on the one hand, these two methods require a large number of equipment stages and a large investment. On the other hand, the energy consumption in the separation process is relatively large. Among them, the loss of taurine in the process of purification by resin adsorption is relatively large