Ammonolysis reaction system, taurine intermediate sodium taurate and taurine preparation method
An ammonolysis reaction and a technology of sodium taurine, which are applied in the preparation of sulfonic acid, the preparation of sulfonates, and the production of bulk chemicals, can solve problems such as high production cost, equipment blockage, and difficulty in separation, and achieve low energy consumption, The effect of increasing the concentration of ammonia and reducing the cost
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[0085] The invention also provides a preparation method of sodium taurate, a taurine intermediate. The preparation method adopts the above-mentioned ammonolysis reaction system, and the preparation method comprises the following steps:
[0086] S1, providing sodium isethionate and ammonia source;
[0087] S2, placing the sodium isethionate and the ammonia source in the ammonolysis reactor for ammonolysis reaction to obtain a mixture;
[0088] S3, using the ammonia separation device to separate the ammonia that has not participated in the reaction in the obtained mixture to obtain ammonia-containing gaseous substances and taurine intermediate sodium taurate;
[0089] S4, compressing the ammonia-containing gaseous substance by the compression device to obtain a supercritical fluid, and circulating the supercritical fluid to the ammonolysis reactor.
[0090] In step S1, the ammonia source is at least one of ammonia water mixture and liquid ammonia. The mass fraction of ammonia...
Embodiment 1
[0113] use as figure 1 The ammonolysis reaction system shown.
[0114] Mix the mixture of ammonia water and liquid ammonia with the aqueous solution of sodium isethionate, pressurize it through a high-pressure pump, and pass it through the ammonolysis reactor after preheating. The sodium aqueous solution is directly mixed and passed into the ammonolysis reactor for reaction. The added ammonia gas enters from the flash tank after exchanging heat with the flash liquid. After stabilization, the molar ratio of ammonia to sodium isethionate in the control system was 16:1.
[0115] The specific process conditions are: 272Kg / h sodium isethionate aqueous solution with a mass fraction of 15% is pressurized to 18MPa by a high-pressure pump, and after being directly mixed with the pressurized circulating ammonia, the temperature is raised to 280°C. The mixture was passed into the ammonolysis reactor and reacted at 18MPa and 280°C for a residence time of 30min to obtain the ammonolysis...
Embodiment 2
[0119] The mixture of ammonia water and liquid ammonia is mixed with the aqueous solution of sodium isethionate, and then pressurized by a high-pressure pump. After preheating, it is reacted in an ammonolysis reactor, and is treated step by step through a first-stage flash tank and a second-stage evaporator. The vapor phase obtained by the secondary evaporation is pressurized and circulated to the primary flash tank. The gas phase obtained by the first-stage flash evaporation is pressurized and circulated to directly mix and heat with the sodium isethionate aqueous solution passed through, and then passed into the ammonolysis reactor for reaction. Additional ammonia enters from the secondary evaporator. After stabilization, the molar ratio of ammonia to sodium isethionate in the control system was 16:1.
[0120] The specific process conditions are: 272Kg / h sodium isethionate aqueous solution with a mass fraction of 15% is pressurized to 18MPa by a high-pressure pump, and afte...
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