Process for producing taurine from alkali taurinates
DCFirst Claim
1. A process for the production of taurine from alkali ditaurinate or alkali tritaurinate, or their mixture, comprising,(a) adding an alkali hydroxide to a solution of alkali ditaurinate, or alkali tritaurinate or their mixture, to prepare a solution of dialkali ditaurinate, or trialkali tritauriante or their mixture,(b) adding an excess amount of ammonia to a solution of dialkali ditaurinate, or dialkali tritaurinate, or their mixture, and subjecting the solution to ammonolysis reaction to yield a mixture of alkali taurinates,(c) removing excess ammonia from (b) and neutralizing alkali taurinates with an acid to form a crystalline suspension of taurine, and(d) recovering taurine by means of solid-liquid separation.
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Abstract
A process for producing taurine from alkali ditaurinate or alkali tritaurinate, or their mixture, comprising the conversion of alkali ditaurinate to dialkali ditaurinate or alkali tritaurinate to trialkali tritaurinate, or their mixture, the ammonolysis reaction of ammonia added to a solution of dialkali ditaurinate or trialkali tritaurinate, or their mixture, to yield alkali taurinate, removing excess ammonia from the foregoing and neutralizing alkali taurinates with an acid to form a crystalline suspension of taurine, and recovering taurine by means of solid-liquid separation.
34 Citations
14 Claims
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1. A process for the production of taurine from alkali ditaurinate or alkali tritaurinate, or their mixture, comprising,
(a) adding an alkali hydroxide to a solution of alkali ditaurinate, or alkali tritaurinate or their mixture, to prepare a solution of dialkali ditaurinate, or trialkali tritauriante or their mixture, (b) adding an excess amount of ammonia to a solution of dialkali ditaurinate, or dialkali tritaurinate, or their mixture, and subjecting the solution to ammonolysis reaction to yield a mixture of alkali taurinates, (c) removing excess ammonia from (b) and neutralizing alkali taurinates with an acid to form a crystalline suspension of taurine, and (d) recovering taurine by means of solid-liquid separation.
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8. A process for the production of taurine from alkali tritaurinate in an overall molar yield of at least 85% on the basis of alkali tritaurinate, comprising:
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(a) adding an alkali hydroxide to a solution comprised of alkali tritaurinate to prepare a solution comprised of trialkali tritaurinate, wherein the molar amount of the alkali hydroxide is at least equal to the molar amount of total taurinates in the solution comprised of the alkali tritaurinate; (b) adding excess ammonia to the solution comprised of the trialkali tritaurinate and subjecting the solution to ammonolysis; (c) removing excess ammonia from the solution of step (b) and neutralizing the solution with an acid to form a crystalline suspension of taurine; (d) recovering taurine by means of solid-liquid separation to obtain a mother liquor comprised of alkali ditaurinate and alkali tritaurinate, and (e) returning the mother liquor of step (d) to step (a) as a solution comprised of alkali ditaurinate and alkali tritaurinate and performing the steps (a), (b), (c) and (d). - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification