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Technique of ion membrane process for preparing taurine

The invention relates to a preparation process, the technique of the ion membrane method, which is applied in the ion membrane method taurine preparation process. In the field of heating and cooling, it can solve the problems of many heating and cooling steps, complicated separation steps, and decomposition of taurine, and achieve the effects of long service life, good insulation and corrosion resistance, and high added value.

Inactive Publication Date: 2005-06-15
ZHEJIANG UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

Domestic manufacturers mostly adopt the ethanolamine method for production, which is mainly divided into three steps: esterification, reduction, and separation; the existing taurine separation method is: water phase change temperature recrystallization method, and there are problems in this method: (1) heating There are many cooling steps and the operation is cumbersome; (2) long-term separation operation in the water phase will cause taurine to decompose and produce side reactions
(3) The hot mother liquor needs to be continuously circulated, and the taurine in the water phase is heated repeatedly, causing decomposition and side reactions
The main components of the reduction product in the synthesis of taurine are taurine, sodium sulfate, and sodium sulfite, of which the content of inorganic salts is as high as 50%, the product yield is low, and the cost is high; the separation steps are complicated and the loss rate is large

Method used

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  • Technique of ion membrane process for preparing taurine
  • Technique of ion membrane process for preparing taurine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] see figure 1 ,

Embodiment approach

[0017] Esterification reaction: Measure 400ml of ethanolamine in a three-necked flask, slowly add 224ml of oleum dropwise under stirring, control the temperature below 20°C, and then stir for another 2hr after the dropwise addition. It was dehydrated under reduced pressure and neutralized to pH 7 with saturated sodium carbonate solution.

[0018] Reduction reaction: Dissolve 356g of anhydrous sodium sulfite in a three-necked flask with 1000ml of water, vacuumize, fill with nitrogen, heat to 100°C, add the esterified product into the three-necked flask within 3 hours, and then filter while it is hot.

[0019] Membrane separation: put the above filtrate into the feedback ion membrane electrodialysis separation device for ion membrane electrodialysis separation. After migration and separation of inorganic salts in the mixed solution, the taurine solution crystallizes out the taurine product. This is the first cycle.

[0020] The second cycle: the above remaining mother liquor ca...

Embodiment 2

[0023] see figure 2 , using a 3-chamber ion membrane electrodialysis separation device, according to the arrangement order of cation exchange membrane, cation exchange membrane and anion exchange membrane, an ion membrane electrodialysis separation device with 3 chambers repeatedly arranged, composed of cation and cation exchange membrane The chamber is the amino acid feedback chamber, the chamber composed of cation and anion exchange membranes is the mixed solution chamber, the introduced taurine and Na 2 SO 3 、Na 2 SO 4The mixture, the anion exchange membrane and the lower group of cation exchange membranes are composed of a salt chamber. The amino acid feedback chamber is near the cathode, and the salt chamber is near the anode. The size of the ion exchange membrane is 200mm×400mm, and the three-chamber structure is arranged in 200 groups. During operation, taurine and Na 2 SO 3 、Na 2 SO 4 Water mixed solution for circulating membrane separation, operating current...

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Abstract

A process for preparing taurine includes preparing the mixture containing taurine from ethanolamine by cyclc method, separating out inorganic salt by feedback type elecric dialysis with ion membrane, crystallizing taurine in solution, and using the residual mother liquid for next reduction reaction. Its advantages are high output rate and high current efficiency.

Description

technical field [0001] The invention relates to a process for preparing taurine by ion membrane method. Background technique [0002] Taurine is a sulfur-containing non-protein amino acid with the chemical name 2-aminoethanesulfonic acid (NH 2 CH 2 CH 2 SO 3 h). In recent years, with the in-depth research on the physiological effects and nutritional value of taurine, its application has become more and more widespread, and it has important applications in medicine, food, dyes, surfactants, pH buffers, etc. As a drug, taurine can be used for choleretic, liver protection, detoxification, anti-inflammatory, antipyretic, sedative, anticonvulsant, antiarrhythmia, treatment of cardiac insufficiency, regulation of osmotic pressure, lowering blood pressure, treatment of arteriosclerosis, inhibition of central nervous system, maintenance of eyesight etc. At present, some developed countries in the world, such as the United States and Japan, have added appropriate amounts of tau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C303/06C07C303/44C07C309/14
Inventor 崔艳丽毛建卫
Owner ZHEJIANG UNIV
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