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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  • Summary
  • Abstract
  • Description
  • Claims
  • 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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0017] [Example 1]

[0018] Catalyst preparation: Weigh 100 grams of silicon-alumina molar ratio SiO 2 / Al 2 O 3 ZSM-5 molecular sieve of 60, adding 40 grams of 40% (weight) silica sol and mixing, extrusion molding, drying at 120 ° C, to obtain sample A.

[0019] A mixture of 5 grams of tetrapropylamine bromide, 10 grams of 1,6-hexanediamine and 30 grams of distilled water was added in the reaction kettle in advance, and 10 grams of sample A were placed on the porous stainless steel mesh in the reaction kettle 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 to obtain a ZSM-5 molecular sieve catalyst sample without a binder.

[0020] Put 3 grams of the prepared non-binder ZSM-5 molecular sieve catalyst sample into a fixed-bed reactor with an inner diameter of 18 mm. Before the experiment, nitrogen was activated at 550...

Example Embodiment

[0021] [Example 2]

[0022] According to the various steps and operating conditions of Example 1, just change the ZSM-5 molecular sieve Si-Al molar ratio SiO 2 / Al 2 O 3 As 100, the corresponding ZSM-5 molecular sieve catalyst without binder was 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 0.2MPa, the conversion rate of ethanol is 95.1%, and the selectivity of ethylene is 90.5%.

Example Embodiment

[0023] [Example 3]

[0024] According to the various steps and operating conditions of Example 1, just change the ZSM-5 molecular sieve Si-Al molar ratio SiO 2 / Al 2 O 3 As 180, the corresponding ZSM-5 molecular sieve catalyst without binder was prepared, and 0.5% iron was supported. The mass ratio of water and ethanol in the raw materials used in the experiment was 0.5:1, the reaction temperature was 275°C, and the space velocity was 0.8 hours. -1 , under the condition of gauge pressure of 0.05MPa, the conversion rate of ethanol is 100%, and the selectivity of ethylene is 97.6%.

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PUM

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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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