Ethylene prepared by catalytic dehydration of ethylene
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An ethylene and catalyst technology, applied in the field of ethanol dehydration to ethylene reaction and corresponding catalysts, can solve the problems of high reaction temperature, use of inert diluent gas, etc., achieve high ethylene selectivity, increase single-pass production, and save costs
Inactive Publication Date: 2008-10-01
HUNAN UNIV
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However, the reported molecular sieve catalysts generally still have disadvantages such as high reaction temperature and the need to use inert diluent gas.
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example 1H
[0024] Example 1HZSM-5(40)
[0025] Weigh 10g of HZSM-5 raw powder with Si / Al=40, wash it with deionized water, dry it at 110°C, and put it into a muffle furnace at 500-700°C for 2-5 hours to prepare HZSM-5(40) catalyst.
[0026] The prepared catalyst was put into an atmospheric fixed-bed reactor (see Figure 1) for investigation, and the dehydration performance of the catalyst is shown in Table 1. Example 2Zn-HZSM-5(40) and Zn-HZSM-5(300)
example 2
[0026] The prepared catalyst was put into an atmospheric fixed-bed reactor (see Figure 1) for investigation, and the dehydration performance of the catalyst is shown in Table 1. Example 2Zn-HZSM-5(40) and Zn-HZSM-5(300)
[0027] Weigh 10g of HZSM-5 raw powder with Si / Al=40, add 0.2M Zn 2+ The solution is refluxed and exchanged 2 to 4 times under boiling conditions, each time is 4 hours, and the amount of solution added each time is 50-100mL. After the exchange, wash with deionized water, dry at 110°C, and then put it into a muffle furnace at 500-700°C The Zn-HZSM-5(40) catalyst can be prepared by medium calcination for 2-5 hours. The content of the active metal component in the prepared catalyst is 1.5-3.0 wt%.
[0028] Weigh 10g of HZSM-5 raw powder with Si / Al=300, add 0.2M Zn 2+ The solution is refluxed and exchanged 2 to 4 times under boiling conditions, each time is 4 hours, and the amount of solution added each time is 50-100mL. After the exchange, wash with deionized ...
example 3
[0030] Example 3 Zr-HZSM-5(40)
[0031] Weigh 10g of HZSM-5 raw powder with Si / Al=40, and use 0.2MZr 4+ The solution is refluxed and exchanged 2 to 4 times under boiling conditions, each time is 4 hours, and the amount of solution added each time is 50-100mL. After the exchange, wash with deionized water, dry at 110°C, and then put it into a muffle furnace at 500-700°C The Zr-HZSM-5(40) catalyst can be prepared by medium calcination for 2-5 hours. The content of the active metal component in the prepared catalyst is 1.5-3.0wt%
[0032] The prepared catalyst was put into an atmospheric pressure fixed-bed reactor for investigation, and the dehydration performance of the catalyst is shown in Table 1.
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Abstract
The invention relates to a catalyst used in a reaction for producing ethylene by ethanol dehydration, which is characterized in that the catalyst of the invention consists of HZSM-5, in which one or a plurality of kinds of active metallic components with the ratio of 0.5 to 7 percent of by weight to the skeleton silica-alumina is 5 to 300. In the reaction for producing ethylene by ethanol dehydration, the reactant ethanol solution does not need to have preliminary gasification and use inert diluent gas, but directly enters into a fixed bed fluid catalytic reactor for implementing the reaction. The catalyst and the reaction technique of the invention can achieve high conversion rate and high selectivity for converting ethanol to ethylene under the conditions of normal pressure, reaction temperature of 200 to 290 DEG C and reactant airspeed of 0.1-10h<-1>, and with 10 to 100 percent of the ethanol water solution as raw reaction materials. Under optimized conditions, the ethanol conversion rate and the ethylene selectivity both approximate 100 percent. The catalyst of the invention is used for the reaction for producing ethylene by ethanol dehydration, and has the outstanding features of wide concentration range of the raw reaction material solution, lower reaction temperature and wider airspeed range, does not need the preliminary gasification of the raw reaction material solution, does not use the inert diluent gas, and has high catalyst activity and selectivity as well as long catalytic life.
Description
technical field [0001] The invention relates to the reaction of ethanol dehydration to ethylene and the corresponding catalyst Background technique [0002] The production scale and technical level of ethylene are important symbols of the development level of a country's chemical industry. With the continuous development of the economy, my country has become a big country in the demand and consumption of energy and resources, especially the demand for ethylene has been increasing at an average rate of 20% every year in recent years, but the output of ethylene is seriously insufficient. Ethylene and its downstream derivatives The satisfaction rate of the domestic market of goods is less than 50% on average, requiring a large amount of imports. At present, the production method of ethylene at home and abroad mainly adopts naphtha cracking method, but with the increasingly tense relationship between global energy and resource supply and demand, this process will face severe cha...
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