A process for producing taurine, comprising mixing aminoethanol sulfate ester (AES) and a carbon dioxide, thus producing a reaction mixture, and heating the reaction mixture in the presence of a sulfite or a bisulfite, or combination thereof, such that taurine is formed.

A process for producing taurine, comprising mixing aminoethanol sulfate ester (AES) and a carbon dioxide, thus producing a reaction mixture, and heating the reaction mixture in the presence of a sulfite or a bisulfite, or combination thereof, such that taurine is formed.

The present invention discloses a method for preparing a high-purity sulfonamide compound and an intermediate of the sulfonamide compound. The method comprises the following steps: a, taking a crude product of a sulfonamide compound (I) as an initial raw material, and enabling the raw material to react with a compound of a formula (II) in presence of alkali and a catalyst so as to synthesize an intermediate of a formula (III); and b, enabling the compound represented by the formula (III) to react with alkali or acid, thereby obtaining the high-purity sulfonamide compound (I).

There is disclosed a process for preparing taurine from alkali isethionate by reacting alkali taurinates in the solution of ammonolysis reaction of alkali isethionate with ammonium bisulfite or ammonium sulfite to obtain taurine and to regenerate alkali bisulfite or alkali sulfite, which is used to react with ethylene oxide to afford alkali isethionate.

There is disclosed a process for preparing taurine from alkali isethionate by reacting alkali taurinates in the solution of ammonolysis reaction of alkali isethionate with ammonium bisulfite or ammonium sulfite to obtain taurine and to regenerate alkali bisulfite or alkali sulfite, which is used to react with ethylene oxide to afford alkali isethionate.

There is disclosed a process for preparing taurine from alkali isethionate by reacting alkali taurinates in the solution of ammonolysis reaction of alkali isethionate with ammonium bisulfite or ammonium sulfite to obtain taurine and to regenerate alkali bisulfite or alkali sulfite, which is used to react with ethylene oxide to afford alkali isethionate.

There is disclosed a process for producing taurine in a molar yield of at least 80% from alkali isethionate, alkali ditaurinate, or alkali tritaurinate by adding excess ammonia and at least of equal molar amount of an alkali hydroxide to a solution comprised of alkali ditaurinate, alkali tritaurinate, or their mixture and subjecting the solution to an ammonolysis to yield a solution comprised of alkali taurinate.

There is disclosed a process for producing taurine in a molar yield of at least 80% from alkali isethionate, alkali ditaurinate, or alkali tritaurinate by adding excess ammonia and at least of equal molar amount of an alkali hydroxide to a solution comprised of alkali ditaurinate, alkali tritaurinate, or their mixture and subjecting the solution to an ammonolysis to yield a solution comprised of alkali taurinate.

There is disclosed a process for producing taurine in a molar yield of at least 80% from alkali isethionate, alkali ditaurinate, or alkali tritaurinate by adding excess ammonia and at least of equal molar amount of an alkali hydroxide to a solution comprised of alkali ditaurinate, alkali tritaurinate, or their mixture and subjecting the solution to an ammonolysis to yield a solution comprised of alkali taurinate.

A system for preparing high-purity taurine and salt. The system can be used in an ethylene oxide process for producing taurine. The system includes an addition reaction device, an ammonolysis reaction device, an evaporation device, and a taurine salt concentrated solution collection device. The ammonolysis reaction device is provided with a metal salt inlet, the taurine salt concentrated solution collection device is connected with an ion exchange system for ion exchange, the ion exchange system is provided with an acid inlet, an adsorption solution outlet and an eluate outlet, the adsorption solution outlet of the ion exchange system is connected with a taurine extraction device, the eluate outlet of the ion exchange system is connected with a salt extraction device, and the ion exchange system is provided with a purified water inlet, an adsorption unit cleaning water outlet and an elution unit cleaning water outlet.