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Method and system for preparing high purity taurine and salt

A technology of taurine and taurine, which is applied in chemical instruments and methods, preparation of sulfonic acid, preparation of sulfonate, etc., can solve the problems of purity of crude taurine and sodium sulfate, low purity of separated products, Solve problems such as complicated separation process, and achieve the effects of easy automation, good crystal form and simplified process

Active Publication Date: 2020-07-31
QIANGJIANG YONGAN PHARMA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problem of this process is that it cannot solve the purity problem of crude taurine and sodium sulfate, and it is only a subsequent treatment process for products with low content and low purity.
[0014] In summary, the current sulfuric acid neutralization process for preparing taurine still has many deficiencies in the separation and purification of taurine and sulfate, mainly reflected in the complexity of the separation process, the low purity of the separated product, and the low extraction rate. , the extraction cost is higher

Method used

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  • Method and system for preparing high purity taurine and salt
  • Method and system for preparing high purity taurine and salt
  • Method and system for preparing high purity taurine and salt

Examples

Experimental program
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Embodiment 1

[0072] Present embodiment shows the preparation process of ammonia solution.

[0073] Preparation of sodium isethionate: mix sodium bisulfite solution with ethylene oxide at a ratio of sodium bisulfite to ethylene oxide molar ratio of 1.05:1, at pH 6.2-6.8, temperature 60-65 Under the condition of ℃, the sodium isethionate can be prepared.

[0074] Preparation of ammonia solution: react sodium isethionate, sodium hydroxide and ammonia water at 255°C and 10-18MPa for 45 minutes (minutes), after the reaction is completed, drive out ammonia gas and recover it, and concentrate to obtain Ammonolysis reaction concentrate.

Embodiment 2

[0076] This example shows that the ion exchange system adsorbs sodium ions to achieve separation into two material solution systems of taurine and sodium sulfate.

[0077] The ammonolysis concentrated solution was prepared as 18L of a solution with a taurine content of 20%. Prepare 12L of sulfuric acid solution with a concentration of 15%. In a small ion exchange system equipped with a resin capable of adsorbing sodium ions, the prepared taurine solution is pumped into the system, and the pH of the collected absorption solution is controlled to be 7-8, and the sodium ion content in the adsorption solution is 0.05%- 1%, a total of 22 L was collected, the content of taurine was 16%, and the content of sodium isethionate was 1.5%. Clean the system with purified water, reuse the cleaning water of the adsorption unit into the material of the concentrate, and wash until the taurine content cannot be detected. Pump 15% sulfuric acid solution into the cleaned system, control the pH ...

Embodiment 3

[0080] This embodiment shows that the adsorption solution and eluent collected in Example 2 are respectively concentrated and extracted.

[0081] (1) Extraction of adsorption liquid: get 3L of adsorption liquid, concentrate until the taurine content is 33%, cool to 15 ℃ and centrifuge to obtain the crude product content of taurine 95.5% (g / g), moisture content 3.5% (g / g) g). The moisture content is 98.96% (g / g), and the purity is very high. After the taurine is extracted, the taurine content in the mother liquor is 10%, the sodium isethionate content is 4.7%, and the sulfate content is less than <10PPm.

[0082] (2) Extraction of eluent: Take 3L of the adsorption solution, concentrate at 95°C for 6 times of crystallization, and centrifuge to obtain a sodium sulfate content of 97.5% (g / g) and a water content of 2.0% (g / g). The moisture content is 99.49% (g / g), and the purity is very high. The taurine content in the mother liquor is less than 1ppb, the hydroxysodium content i...

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Abstract

The invention discloses a method and a system for preparing high-purity taurine and salt. The method comprises the following steps: reacting ethylene oxide with bisulfite to generate hydroxyethyl sulfonate; carrying out ammonolysis reaction on the hydroxyethyl sulfonate, ammonia and metal salt, evaporating to obtain a taurine salt concentrate, carrying out ion exchange on the concentrate in an ionexchange system to obtain an adsorption solution with taurine as a main component, independently collecting the adsorption solution, and extracting taurine from the adsorption solution; and eluting the adsorbed metal cations by using acid, independently collecting eluate, and extracting salt from the eluate or directly taking the eluate as a salt solution product. According to the method, materials of two target products are separated in advance after ammonolysis reaction, and then the target products are extracted respectively, so that the extraction process is very simple, interference on product separation when the two target products are in the same maternal system does not need to be considered at all, the process is simple, and the production cost is greatly reduced.

Description

technical field [0001] The invention relates to a production method in the process of chemically synthesizing taurine, in particular to a method for producing high-purity taurine and its salt by an ethylene oxide method and a production system thereof. Background technique [0002] The chemical name of taurine is 2-aminoethanesulfonic acid, which is the most abundant sulfur-containing free amino acid in the cells of the body. The chemical synthesis process route of taurine mainly includes ethylene oxide method and ethanolamine method. Wherein the oxirane method preparation comprises three steps: [0003] (1) Taking oxirane as starting raw material, the addition reaction of oxirane and sodium bisulfite obtains sodium isethionate; [0004] The main reactions are: [0005] CH 2 CH 2 O+NaHSO 3 →HOCH 2 CH 2 SO 3 Na [0006] (2) Ammonolysis of sodium isethionate obtains sodium taurate; [0007] HOCH 2 CH 2 SO 3 Na+NH 3 →H 2 NCH 2 CH 2 SO 3 Na+H 2 o [0008] (3...

Claims

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Application Information

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IPC IPC(8): C07C303/22C07C303/32C07C303/44C07C309/14
CPCC07C303/02C07C303/22C07C303/32C07C303/44C07C309/08C07C309/14C07C309/12B01J39/18
Inventor 陈勇方锡权李少波刘锋
Owner QIANGJIANG YONGAN PHARMA
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