Method for preparing taurine

A technology of taurine and sodium taurine, applied in the preparation of sulfonic acid, organic chemistry and other directions, can solve the problems of high energy consumption, high labor intensity and high production cost, and achieve energy saving, low production cost and low cost. Effect

Inactive Publication Date: 2009-08-19
王代龙 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is because esterification, sulfonation (reduction) reaction all is reversible reaction, and the interaction such as reaction condition, time, the degree of reaction, separation method causes the yield of taurine to be only 48~52%, and cost yield The rate is 49%, the production cost is high, the energy consumption is large, and the labor intensity is high

Method used

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  • Method for preparing taurine

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Effect test

Embodiment 1

[0017] The preparation of sodium isethionate: feed ethylene oxide gas in 24wt% sodium bisulfite solution (the molar ratio of ethylene oxide and sodium bisulfite is 1:1.2) at 0.1MPa, pH Value 6.5-7.5 and react at 80°C for 1.2 hours to obtain a mixture containing sodium isethionate (99% conversion).

[0018] The preparation of sodium taurate: in the presence of catalyst sodium carbonate and sodium bicarbonate (the mol ratio of sodium carbonate and sodium bicarbonate is 3:1) (the consumption of catalyst is 1% of the quality of sodium isethionate) , Liquid ammonia is passed into the mixture containing sodium isethionate (the concentration of ammonia in the reaction solution is 20%, percent by weight) and reacted for 45 minutes at 15 MPa and 160° C. to obtain an ammonolysis solution containing sodium taurate.

[0019] Preparation of taurine: After evaporating the ammonium solution containing sodium taurine to remove ammonia, neutralize it with 98% sulfuric acid at 30-70°C to a pH v...

Embodiment 2

[0021] Preparation of sodium isethionate: react 1:1.1 molar ratio of ethylene oxide and sodium bisulfite at 0.07MPa, pH 6.5-7.5 and 75°C for 1.5 hours to prepare sodium isethionate .

[0022] The preparation of sodium taurate: in the presence of catalyst sodium carbonate and sodium bicarbonate (the mol ratio of sodium carbonate and sodium bicarbonate is 5:1) (the consumption of catalyst is 5% of the quality of sodium isethionate) , sodium isethionate and liquid ammonia (the concentration of ammonia in the reaction solution is 25%, percent by weight) reacted for 25 minutes at 21 MPa and 280° C. to obtain an ammonia solution containing sodium taurate.

[0023] Preparation of taurine: After evaporating the ammonium solution containing sodium taurine to remove ammonia, neutralize it with 95% sulfuric acid at 30-70°C to a pH value of 7.8-7.9, then concentrate, crystallize, and separate to obtain the water content In the 5-10wt% taurine wet product, the taurine wet product with a w...

Embodiment 3

[0026] Preparation of sodium isethionate: react 1:1 molar ratio of ethylene oxide and sodium bisulfite at 0.08MPa, pH 6.5—7.5 and 85°C for 1.1 hours to prepare sodium isethionate .

[0027] The preparation of sodium taurate: in the presence of catalyst sodium carbonate and sodium bicarbonate (the mol ratio of sodium carbonate and sodium bicarbonate is 4:1) (the consumption of catalyst is 3% of the quality of sodium isethionate) , Sodium isethionate and liquid ammonia (the concentration of ammonia in the reaction solution is 30%, percentage by weight) ammonolysis reaction at 17MPa and 190° C. for 30 minutes to obtain an ammonolysis solution containing sodium taurate.

[0028] Preparation of taurine: After evaporating the ammonium solution containing sodium taurine to remove ammonia, neutralize it with 95% sulfuric acid at 30-70°C to a pH value of 7.8-7.9, then concentrate, crystallize, and separate to obtain the water content In the 5-10wt% taurine wet product, the taurine wet...

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Abstract

The invention relates to a method for preparing taurine, comprising the following steps: epoxy ethane and sodium bisulfite are reacted under 0.05 to 0.1MPa, with pH value of 6.5 to 7.5 and at a temperature between 75 and 85 DEG C to form hydroxyethyl sodium sulfonate; the hydroxyethyl sodium sulfonate and liquid ammonia are subjected to ammonolysis reaction at under 14 to 21MPa and at a temperature between 160 and 280 DEG C to form ammonolysis solution containing sodium taurate; and the ammonolysis solution is evaporated to remove ammonia, neutralized by sulphuric acid, concentrated, crystallized, separated, pre-dried in a boiling drying device or a vibration fluidization drying device, and then added into a microwave drying device to be dried and sterilized to obtain the taurine. The method for synthesizing the taurine has the advantages of short time, high yield and lower cost, and is easy for industrialized production. The water content of a taurine wet product can be reduced to below 0.30 percent through combined application of pre-drying of the boiling drying device or the vibration fluidization drying device and microwave drying, and simultaneously the device has the function of sterilizing.

Description

technical field [0001] The invention relates to a method for preparing taurine. Background technique [0002] Taurine (chemical name 2-aminoethanesulfonic acid), pure product is colorless or white oblique crystal, odorless, stable chemical properties, soluble in organic solvents such as ether, because it was first extracted from ox bile in 1843 Therefore, it is named "Taurine" (Latin, meaning "amino acid from cattle"). It differs from other basic amino acids such as glutamic acid, lysine, methionine, alanine, serine, valine and threonine in that taurine does not directly participate in the synthesis of proteins, but is a free Special amino acids outside the cell. It is now known that taurine can play a variety of roles in the body, including detoxification, enhancing the stability of cell membranes, regulating the production of (brain) excitatory neurotransmitters, and intercellular calcium content, etc. Taurine is the most abundant sulfur-containing free radical amino ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C309/14C07C303/02
Inventor 陆韬肖运时
Owner 王代龙
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