Method for producing triethanolamine

Abstract

The invention relates to a method for producing triethanolamine, and mainly solves the technical problems of low triethanolamine yield and high by-products in the existing ethanolamine production technology. In the present invention, ethylene oxide and ammonia are used as reaction raw materials, and in a fixed-bed reactor, under pressure and heating conditions, the catalyst is contacted and reacted with a catalyst, wherein the catalyst adopts a molecular molar ratio of silicon to aluminum (SiO 2 / Al 2 O 3 The technical scheme of the zeolite molecular sieve with ) of 15-100 solves the problem well and can be applied to the industrial production of triethanolamine.

Description

technical field

[0001] The present invention relates to the method for producing triethanolamine. Background technique

[0002] Ethanolamine (abbreviation: EA) is the general term for the products in which the hydrogen atoms in ammonia are replaced by one, two or three hydroxyethanols. They are monoethanolamine (abbreviation: MEA), diethanolamine (abbreviation: DEA) and triethanolamine ( Abbreviation: TEA), they are one of the important downstream products of organic chemical raw material ethylene oxide (abbreviation: EO). In recent years, ethanolamine has played an increasingly important application value in secondary oil recovery, gas purification and pharmaceutical intermediates. As an important downstream product of EO, the market demand for ethanolamine is growing rapidly.

[0003] Ethanolamine is mainly produced by the ammonia water method, that is, ammonia water and EO undergo a liquid phase reaction. Since the hydrogen-forming ability and polar nature of water are ...

Examples

Embodiment 1

[0019] The fixed-bed reactor is filled with a binder-free hydrogen type ZSM-5 zeolite molecular sieve catalyst, the zeolite grain size is 200-300 nanometers, silicon-alumina (SiO 2 / Al 2 o 3 ) molar ratio is 15, under the condition that the reaction pressure is 4MPa and the reaction temperature is 83°C, feed anhydrous ammonia and ethylene oxide to react, wherein the ammonia / ethylene oxide molecular molar ratio is 6.9, epoxy The feed gravimetric space velocity of ethane is 0.2h -1 , the weight ratio of monoethanolamine, diethanolamine and triethanolamine in the product is 38.6:36.2:25.2.

Embodiment 2

[0021] The fixed-bed reactor is filled with a binder-free hydrogen type ZSM-5 zeolite molecular sieve catalyst, the zeolite grain size is 200-300 nanometers, silicon-alumina (SiO 2 / Al 2 o 3 ) molar ratio is 15, under the condition that the reaction pressure is 4MPa and the reaction temperature is 71°C, feed anhydrous ammonia and ethylene oxide to react, wherein the ammonia / ethylene oxide molecular molar ratio is 4.0, epoxy The feed gravimetric space velocity of ethane is 0.2h -1 , the weight ratio of monoethanolamine, diethanolamine and triethanolamine in the product is 44.4:34.2:21.4.

Embodiment 3

[0023] The fixed-bed reactor is filled with a binder-free hydrogen type ZSM-5 zeolite molecular sieve catalyst, the zeolite grain size is 200-300 nanometers, silicon-alumina (SiO 2 / Al 2 o 3 ) molar ratio is 15, under the condition that the reaction pressure is 4MPa and the reaction temperature is 50°C, feed anhydrous ammonia and ethylene oxide to react, wherein the ammonia / ethylene oxide molecular molar ratio is 6.9, epoxy The feed gravimetric space velocity of ethane is 0.1h -1 , the weight ratio of monoethanolamine, diethanolamine and triethanolamine in the product is 41.9:37.0:21.1.

technical field

[0001] The present invention relates to the method for producing triethanolamine. Background technique

[0002] Ethanolamine (abbreviation: EA) is the general term for the products in which the hydrogen atoms in ammonia are replaced by one, two or three hydroxyethanols. They are monoethanolamine (abbreviation: MEA), diethanolamine (abbreviation: DEA) and triethanolamine ( Abbreviation: TEA), they are one of the important downstream products of organic chemical raw material ethylene oxide (abbreviation: EO). In recent years, ethanolamine has played an increasingly important application value in secondary oil recovery, gas purification and pharmaceutical intermediates. As an important downstream product of EO, the market demand for ethanolamine is growing rapidly.

[0003] Ethanolamine is mainly produced by the ammonia water method, that is, ammonia water and EO undergo a liquid phase reaction. Since the hydrogen-forming ability and polar nature of water are ...

Examples

Embodiment 1

[0019] The fixed-bed reactor is filled with a binder-free hydrogen type ZSM-5 zeolite molecular sieve catalyst, the zeolite grain size is 200-300 nanometers, silicon-alumina (SiO 2 / Al 2 o 3 ) molar ratio is 15, under the condition that the reaction pressure is 4MPa and the reaction temperature is 83°C, feed anhydrous ammonia and ethylene oxide to react, wherein the ammonia / ethylene oxide molecular molar ratio is 6.9, epoxy The feed gravimetric space velocity of ethane is 0.2h -1 , the weight ratio of monoethanolamine, diethanolamine and triethanolamine in the product is 38.6:36.2:25.2.

Embodiment 2

[0021] The fixed-bed reactor is filled with a binder-free hydrogen type ZSM-5 zeolite molecular sieve catalyst, the zeolite grain size is 200-300 nanometers, silicon-alumina (SiO 2 / Al 2 o 3 ) molar ratio is 15, under the condition that the reaction pressure is 4MPa and the reaction temperature is 71°C, feed anhydrous ammonia and ethylene oxide to react, wherein the ammonia / ethylene oxide molecular molar ratio is 4.0, epoxy The feed gravimetric space velocity of ethane is 0.2h -1 , the weight ratio of monoethanolamine, diethanolamine and triethanolamine in the product is 44.4:34.2:21.4.

Embodiment 3

[0023] The fixed-bed reactor is filled with a binder-free hydrogen type ZSM-5 zeolite molecular sieve catalyst, the zeolite grain size is 200-300 nanometers, silicon-alumina (SiO 2 / Al 2 o 3 ) molar ratio is 15, under the condition that the reaction pressure is 4MPa and the reaction temperature is 50°C, feed anhydrous ammonia and ethylene oxide to react, wherein the ammonia / ethylene oxide molecular molar ratio is 6.9, epoxy The feed gravimetric space velocity of ethane is 0.1h -1 , the weight ratio of monoethanolamine, diethanolamine and triethanolamine in the product is 41.9:37.0:21.1.

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