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Method for preparing ethylene by dehydrating ethanol

A technology for ethanol dehydration and ethylene, applied in chemical instruments and methods, hydrocarbon production from oxygen-containing organic compounds, organic chemistry, etc., can solve problems such as poor catalyst stability, achieve good stability, improve carbon storage capacity, and prolong catalyst life Effect

Active Publication Date: 2013-05-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is the problem of poor catalyst stability in the prior art, and a new method for ethanol dehydration to ethylene is provided

Method used

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  • Method for preparing ethylene by dehydrating ethanol
  • Method for preparing ethylene by dehydrating ethanol
  • Method for preparing ethylene by dehydrating ethanol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh 250 grams of pseudo-boehmite, 30 grams of starch, and 12.5 grams of scallop powder, knead them in a kneader for 30 minutes, add 225 ml of 5% nitric acid solution, knead for another 20 minutes, then extrude into strips, and dry at 110°C for 10 hours , and then activated in a muffle furnace at 650° C. for 8 hours to obtain catalyst A. The physical properties of the catalysts are listed in Table 1.

Embodiment 2

[0020] Weigh 300 grams of aluminum hydroxide, 80 grams of polyethylene glycol, and 15 grams of squash powder, and knead them in a kneader for 30 minutes, add 185 milliliters of 5% nitric acid solution, and knead for another 15 minutes, then extrude into strips, and dry at 120 ° C for 10 minutes. Hours, and then activated in a muffle furnace at 600°C for 8 hours to obtain catalyst B. The physical properties of the catalysts are listed in Table 1.

Embodiment 3

[0022] Weigh 200 grams of boehmite, 100 grams of urea, and 15 grams of scallop powder, knead in a kneader for 30 minutes, add 250 ml of 5% nitric acid solution, knead for another 25 minutes, then extrude into strips, and dry at 110 ° C for 15 hours. Then place it in a muffle furnace at 500° C. for 6 hours to obtain catalyst C. The physical properties of the catalysts are listed in Table 1.

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Abstract

The invention relates to a method for preparing ethylene by dehydrating ethanol and mainly solves the problem of low catalyst stability in the prior art. The problem is solved by adopting the technical scheme that ethanol which is used as a reaction raw material and a catalyst contact under the conditions that the reaction temperature is 300 to 550 DEG C, and the hourly space velocity relative to ethanol is 0.1 to 25 hours<-1> to react so as to generate ethylene, wherein the used catalyst is alumina of which the specific surface area is 150 to 250 m<2> / g and the total pore volumes are 0.5 to 1.0 cm<3> / g, and the pore volumes of pore diameters of less than 10 nanometers is 50 to 90 percent of the total pore volumes, and the pore volumes of pore diameters of more than 10 nanometers is 10 to 50 percent of the total pore volumes. The method can be used for industrial production of preparing the ethylene by dehydrating ethanol.

Description

technical field [0001] The invention relates to a method for preparing ethylene by dehydrating ethanol. Background technique [0002] Ethylene, formula C 2 h 4 , is a very important petrochemical raw material. The dehydration of ethanol to ethylene was once a widely used route to obtain ethylene. It has a history of more than 200 years and was the main ethylene production route in the 19th century. Due to the vigorous development of petrochemical industry in the 20th century, cracking to ethylene is more economical, and this route is gradually eliminated. However, in some occasions, such as a wide range of ethanol sources and a small amount of ethylene consumption, ethanol dehydration is still used. [0003] With the massive use of petroleum resources and the danger of being depleted more and more, the price of petroleum is rising day by day, and the competitive advantage of the cracking method to produce ethylene is getting smaller and smaller. On the other hand, the r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/04C07C1/24B01J21/04B01J35/10
CPCY02P20/52
Inventor 金照生徐菁李亚男金萍周海春孙兰萍黄祖娟
Owner CHINA PETROLEUM & CHEM CORP
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