Method for high selectivity preparation of ethylene from ethanol

Abstract

The invention provides a method for high selectivity preparation of ethylene from ethanol, and the method comprises the following steps: (1) an ethanol-butanol raw material passes a 130-150 DEG C vaporization zone, and then is led into a reaction zone; (2) in the reaction zone, in the presence of a catalyst, the ethanol is converted into a gas phase low carbon hydrocarbon component containing the ethylene and butane by the dehydration reaction; and (3) a gas phase ethylene component is recovered by quenching separation. By use of the method, the selectivity of preparation of the ethylene from the ethanol can be effectively improved.

Description

technical field

[0001] The invention belongs to the field of producing ethylene compounds, and in particular relates to a reaction method for improving the selectivity of ethanol for synthesizing ethylene. Background technique

[0002] Ethylene is an important basic chemical raw material, and its production technology is of strategic significance. At present, the production of ethylene is obtained from petroleum resources through reaction processes such as thermal cracking and catalytic cracking. These two types of technology processes are mature and have a wide range of industrial applications. However, the raw materials used in both types are disposable, non-renewable fossil raw materials. With the depletion of fossil energy sources worldwide, the development of ethylene production technology based on renewable raw materials is of extremely important strategic significance. The dehydration process of ethanol is often accompanied by side reactions to generate C4 olefins,...

Examples

Embodiment 1

[0017] Take 1000g sodium ZSM-5 molecular sieve with Si / Al of 35, fully grind it, then exchange it with ammonium nitrate solution at 80-90°C for 3 times, then wash it with deionized water three times until the Na content is lower than 0.05% ( % by mass), after drying at 120°C, and roasting at 500°C for 3h, catalyst A was prepared.

Embodiment 2

[0019] Take 500g of sodium ZSM-5 molecular sieve with Si / Al of 43, fully grind it, exchange it with ammonium nitrate solution at 80-90°C for 3 times, then wash it with deionized water three times until the Na content is lower than 0.05% (mass percentage), after drying at 120°C, and roasting at 550°C for 3h, catalyst B was prepared.

Embodiment 3

[0021] Take 500g of sodium-type ZSM-5 molecular sieve with Si / Al of 40, after fully grinding, exchange 3 times with ammonium nitrate solution at 80-90°C, then wash with deionized water three times until the Na content is lower than 0.05% (mass percentage), after drying at 120°C, roasting at 500°C for 3h. Get 90g molecular sieve and 10g aluminum oxide and knead under the action of 10wt% oxalic acid, then 450 ℃ of roasting 3h, make catalyst C.

technical field

[0001] The invention belongs to the field of producing ethylene compounds, and in particular relates to a reaction method for improving the selectivity of ethanol for synthesizing ethylene. Background technique

[0002] Ethylene is an important basic chemical raw material, and its production technology is of strategic significance. At present, the production of ethylene is obtained from petroleum resources through reaction processes such as thermal cracking and catalytic cracking. These two types of technology processes are mature and have a wide range of industrial applications. However, the raw materials used in both types are disposable, non-renewable fossil raw materials. With the depletion of fossil energy sources worldwide, the development of ethylene production technology based on renewable raw materials is of extremely important strategic significance. The dehydration process of ethanol is often accompanied by side reactions to generate C4 olefins,...

Examples

Embodiment 1

[0017] Take 1000g sodium ZSM-5 molecular sieve with Si / Al of 35, fully grind it, then exchange it with ammonium nitrate solution at 80-90°C for 3 times, then wash it with deionized water three times until the Na content is lower than 0.05% ( % by mass), after drying at 120°C, and roasting at 500°C for 3h, catalyst A was prepared.

Embodiment 2

[0019] Take 500g of sodium ZSM-5 molecular sieve with Si / Al of 43, fully grind it, exchange it with ammonium nitrate solution at 80-90°C for 3 times, then wash it with deionized water three times until the Na content is lower than 0.05% (mass percentage), after drying at 120°C, and roasting at 550°C for 3h, catalyst B was prepared.

Embodiment 3

[0021] Take 500g of sodium-type ZSM-5 molecular sieve with Si / Al of 40, after fully grinding, exchange 3 times with ammonium nitrate solution at 80-90°C, then wash with deionized water three times until the Na content is lower than 0.05% (mass percentage), after drying at 120°C, roasting at 500°C for 3h. Get 90g molecular sieve and 10g aluminum oxide and knead under the action of 10wt% oxalic acid, then 450 ℃ of roasting 3h, make catalyst C.

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