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Method for producing ethylene through ethanol dehydration

A technology for ethanol dehydration and ethylene, which is applied in the production of bulk chemicals, chemical instruments and methods, molecular sieve catalysts, etc., can solve the problems of low reaction space velocity, etc., and achieve the effect of good technical effect

Inactive Publication Date: 2012-08-29
CHINA PETROLEUM & CHEM CORP +1
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is to overcome the technical problem of low reaction space velocity in the prior art, and provide a new method for ethanol dehydration to produce ethylene

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Catalyst preparation: weigh 100 grams of silicon-aluminum molar ratio SiO 2 / Al 2 o 3 60 ZSM-5 molecular sieve, add 40 grams of 40% (weight) silica sol, mix, extrude, and dry at 120°C to obtain sample A.

[0019] A mixture of 5 grams of tetrapropylammonium bromide, 10 grams of 1,6-hexanediamine and 30 grams of distilled water was added to the reaction kettle in advance, and 10 grams of sample A was placed in the reaction kettle above the porous stainless steel mesh and sealed at 180 ° C. The gas-solid phase treatment was carried out for 100 hours. After the product was taken out, it was washed with distilled water, dried in the air and calcined at 600°C for 2 hours in an air atmosphere to obtain a binder-free ZSM-5 molecular sieve catalyst sample.

[0020] Put 3 grams of the prepared binder-free ZSM-5 molecular sieve catalyst sample into a fixed-bed reactor with an inner diameter of 18 mm. Before the experiment, nitrogen gas was activated at 550 ° C for 2 hours and t...

Embodiment 2

[0022] According to each step and operating condition of embodiment 1, just change ZSM-5 molecular sieve silicon aluminum molar ratio SiO 2 / Al 2 o 3 is 100, and the corresponding ZSM-5 molecular sieve catalyst without binder is prepared. The raw material used in the experiment is still anhydrous ethanol, the reaction temperature is 230 ° C, and the space velocity is 0.5 hours -1 , under the condition of gauge pressure of 0.2 MPa, the conversion rate of ethanol is 95.1%, and the selectivity of ethylene is 90.5%.

Embodiment 3

[0024] According to each step and operating condition of embodiment 1, just change ZSM-5 molecular sieve silicon aluminum molar ratio SiO 2 / Al 2 o 3 is 180, and the ZSM-5 molecular sieve catalyst corresponding to no binder is prepared, and 0.5% iron is loaded. The mass ratio of water to ethanol in the raw materials used in the experiment is 0.5:1, the reaction temperature is 275°C, and the space velocity is 0.8 hours -1 , under the condition of a gauge pressure of 0.05 MPa, the conversion of ethanol is 100%, and the selectivity of ethylene is 97.6%.

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Abstract

The invention relates to a method for producing ethylene through ethanol dehydration, and mainly solves the technical problem of low reaction space velocity in the prior art. Through the adoption of the technical scheme that ethanol is taken as a raw material, and under the conditions that the reaction temperature is 200 to 380 DEG C, the reaction pressure measured by gauge pressure is 0 to 2 MPa, and the reaction space velocity is 0.1 to 8 hours <-1>, the raw material is in contact with a binderless ZSM-5 molecular sieve taken as a catalyst to generate an ethylene-contained substance separated to obtain ethylene products. Therefore, the invention solves the problem well, and can be used in the industrial production of ethylene.

Description

technical field [0001] The invention relates to a method for producing ethylene by ethanol dehydration, in particular to a method for using ZSM-5 molecular sieve to catalyze the dehydration of ethanol to produce ethylene. Background technique [0002] Ethylene is an extremely important basic organic chemical raw material. The ethylene industry is the foundation of the petrochemical industry and occupies an extremely important position in the national economy. In recent years, with the rapid growth of the demand for derivatives such as polyethylene, the demand for ethylene has been increasing year by year. At present, ethylene is mainly produced from natural gas or light petroleum distillate by steam cracking process. However, as the price of natural gas and light petroleum distillate continues to rise, some other ways to increase ethylene production have become the focus of attention. Especially with the rapid development of biotechnology, the technology of biological ethan...

Claims

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Application Information

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IPC IPC(8): C07C11/04C07C1/24B01J29/40B01J29/46
CPCY02P20/52
Inventor 刘俊涛王万民李蕾
Owner CHINA PETROLEUM & CHEM CORP
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