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Catalyst used in reaction process of producing ethylene from dehydration of ethanol

A catalyst and preparation process technology, applied in the direction of physical/chemical process catalysts, molecular sieve catalysts, chemical/physical processes, etc., can solve the problems of using inert diluent gas, high reaction temperature, etc., to increase single-pass production, ethanol conversion rate and ethylene selection High performance and reduced heating energy consumption

Inactive Publication Date: 2008-10-01
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reported molecular sieve catalysts still have disadvantages such as high reaction temperature and the need to use inert diluent gas.

Method used

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  • Catalyst used in reaction process of producing ethylene from dehydration of ethanol
  • Catalyst used in reaction process of producing ethylene from dehydration of ethanol
  • Catalyst used in reaction process of producing ethylene from dehydration of ethanol

Examples

Experimental program
Comparison scheme
Effect test

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 2H

[0027] Example 2HZSM-5(40) / SA

[0028] Weigh 28.8g33.3% silica sol, 12gNaOH particles, 6.6g Al 2 (SO4) 3 powder and 192gH 2 O, move the silica sol into a three-necked flask, add NaOH solution, heat until clarified, then add Al 2 (SO4) 3 solution, kept stirring for 2 hours, cooled to room temperature, and adjusted the pH value to 6.5-7 to obtain amorphous silica-alumina gel; weigh 10g of HZSM-5 raw powder with Si / Al=40, add 5-10g of amorphous silicon Mix aluminum glue, heat at 60-100°C for 5-8 hours under reflux, dry at 110°C, and then bake in a muffle furnace at 500°C-700°C for 2-4 hours to prepare HZSM-5(40) / SA catalyst. The amount of the prepared amorphous silicon-alumina is 3.5wt%-6.5wt%.

[0029] 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.

example 3H

[0030] Example 3HZSM-5(25) / SA

[0031] Weigh 28.8g33.3% silica sol, 12gNaOH particles, 6.6g Al 2 (SO4) 3 powder and 192gH 2 O, move the silica sol into a three-necked flask, add NaOH solution, heat until clarified, then add Al 2 (SO4) 3 solution, keep stirring for 2 hours, cool to room temperature, and adjust the pH value to 6.5-7 to obtain amorphous silica-alumina gel; weigh 10g of HZSM-5 raw powder with Si / Al=25, add 5-15g of amorphous silicon Mix aluminum glue, heat at 60-100°C for 5-8 hours under reflux, dry at 110°C, and then bake in a muffle furnace at 500-700°C for 2-4 hours to prepare the HZSM-5(25) / SA catalyst. The 5g, 10g, and 15g of amorphous silica-alumina colloids added were mixed and recorded as HZSM-5(25) / SA(0.5), HZSM-5(25) / SA(1.0), HZSM-5(25) / SA(1.5 ). The amount of the prepared amorphous silicon-alumina is 3.5wt%-12.5wt%.

[0032] The prepared catalyst was put into an atmospheric pressure fixed-bed reactor for investigation, and the dehydration perform...

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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 the ratio of the 0.5 to 7 percent of one or a plurality of kinds of active metallic components by weight to the 5 to 30 percent of amorphous silica-alumina gel and skeleton silica-alumina by weight is 5 to 300. In the reaction implemented in a fixed bed fluid reactor, the catalyst 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, the vapor ethylene selectivity and the overall ethylene yield all 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 a catalyst used in the reaction process of ethanol catalytic dehydration to ethylene Background technique [0002] Ethylene is one of the most important basic organic chemical raw materials, and currently it is mainly produced through the cracking of naphtha. With the increasing shortage of global petroleum resources and the increasing demand for ethylene, it has become inevitable to use biomass to produce ethylene to relieve the pressure of petroleum-based ethylene production, and even eventually replace petroleum-based ethylene production. Biomass route to ethylene production means that ethanol is first obtained by fermentation of biomass, and then ethylene is produced from ethanol through catalytic dehydration. On the one hand, biomass resources have a wide range of sources, abundant reserves, and can be regenerated every year. On the other hand, with the continuous improvement of industrial biotechnology, the production c...

Claims

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Application Information

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IPC IPC(8): B01J29/42B01J29/40C07C1/24C07C11/04
CPCY02P20/52
Inventor 晁自胜章文贵周春姣黄彩娟
Owner HUNAN UNIV
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