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Method for preparing ethylene by ethanol dehydration

A technology for ethanol dehydration and ethylene, applied in chemical instruments and methods, hydrocarbons, molecular sieve catalysts, etc., can solve the problems of low space velocity, high reaction temperature, and high energy consumption, and achieve lower temperature, lower reaction temperature, and lower reaction temperature. reduced effect

Active Publication Date: 2008-02-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0012] The technical problem to be solved by the present invention is to overcome the technical problems of high reaction temperature, low space velocity and high energy consumption in the prior art, and provide a new method for ethanol dehydration to ethylene

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] According to the molar ratio of silicon to aluminum SiO 2 / Al 2 o 3 Prepare a slurry containing silicon, aluminum, templating agent and water at a ratio of 40, and stir at room temperature for 20 hours. Then crystallize at a temperature of 140-210°C for 50-120 hours, and then wash, dry, and roast the crystallization solution to obtain SiO 2 / Al 2 o 3 ZSM-5 molecular sieve with a molar ratio of 40. Add 100 grams of ZSM-5 molecular sieves to 60 grams of silica gel, mix, extrude, dry at 180°C, and roast at 500°C to obtain a ZSM-5 catalyst.

[0021] Put 3 grams of the prepared ZSM-5 molecular sieve catalyst into a fixed-bed reactor with an inner diameter of 18 mm. Before the experiment, pass nitrogen to activate at 550°C for 2 hours and then cool down to the reaction temperature. The weight of water and ethanol in the raw materials used in the experiment The ratio is 0.2:1, the reaction temperature is 250°C, and the space velocity is 1 hour -1 , under the condition o...

Embodiment 2

[0023] According to each step and operating condition of embodiment 1, just change: the silicon aluminum molar ratio SiO of ZSM-5 molecular sieve catalyst 2 / Al 2 o 3 for 10. The weight ratio of raw material water and ethanol used in the experiment is 5.0: 1, the reaction temperature is 200 ° C, and the space velocity is 0.3 hours -1 , under the condition of a gauge pressure of 0.2 MPa, the ethanol conversion rate is 20.5%, and the ethylene selectivity is 30.7%.

Embodiment 3

[0025] According to each step and operating condition of embodiment 1, just change: the silicon aluminum molar ratio SiO of ZSM-5 molecular sieve catalyst 2 / Al 2 o 3 for 60. The mass ratio of water to ethanol in the raw materials used in the experiment is 0.5:1, the reaction temperature is 280°C, and the space velocity is 0.5 hours -1 , under the condition of gauge pressure of 0.05MPa, the ethanol conversion rate is 99.5%, and the ethylene selectivity is 99.8%.

[0026] [Example 4]

[0027] According to each step and operating condition of embodiment 1, just change: the silicon aluminum molar ratio SiO of ZSM-5 molecular sieve catalyst 2 / Al 2 o 3 for 180. The mass ratio of water to ethanol in the raw materials used in the experiment is 6:1, the reaction temperature is 380°C, and the space velocity is 1 hour -1 , under the condition of a reaction pressure of 0.8MPa in gauge pressure, the conversion rate of ethanol is 100%, and the selectivity of ethylene is 89.3%.

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Abstract

The present invention relates to a preparation method of ethylene using the dehydration of ethanol, which is to solve the problem in the prior technology that: the reaction temperature is higher; the hollow speed is lower and the energy consumption is higher. The present invention uses ethanol as the raw material and water as the thinner; under the condition that the reaction temperature is 200- 400 Celsius system, the reaction pressure calculated by a pressure meter is 0-2MPa and the reaction weight hollow speed is 0.1-10 hours, the raw material is contacted with ZSM molecule screen catalyzer to produce a ethylene flow; thereinto the molar ratio between water and ethanol is 0-10: 1. The technical scheme can solve the problem greatly, which can be used in the industrial production of ethylene.

Description

technical field [0001] The invention relates to a method for producing ethylene by dehydration of ethanol, in particular to a method for using ZSM molecular sieve as a catalyst to realize the dehydration of ethanol for production of 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 technolog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/04C07C5/42B01J29/40B01J29/65
CPCY02P20/52
Inventor 刘俊涛钟思青忻晓琦王华文
Owner CHINA PETROLEUM & CHEM CORP
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