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Method for preparing ethylene by dehydrating ethanol

A technology for ethanol dehydration and ethylene, which is applied in the production of hydrocarbons from oxygen-containing organic compounds, bulk chemical production, organic chemistry, etc., can solve the problems of catalyst deactivation, many by-products, short life, etc. Effect of reducing deep reaction and improving selectivity

Active Publication Date: 2014-05-28
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 that in the prior art, due to the easy coking of the catalyst surface, the catalyst is easily deactivated, the service life is short, the ethylene selectivity is low, and by-products, especially CO, CO 2 、H 2 The problem of many by-products provides a new method for ethanol dehydration to ethylene

Method used

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  • Method for preparing ethylene by dehydrating ethanol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 200 grams of pseudo-boehmite in a kneader, add 2 grams of fenugreek powder and knead for 30 minutes, add dropwise 60 ml of 0.5% lithium acetate solution, add 200 ml of 0.5% nitric acid and knead for 30 minutes, extrude into strips, and Dry at 120°C for 12 hours, and bake at 550°C for 10 hours to obtain the finished product A of ethanol dehydration to ethylene catalyst. Al in the catalyst 2 o 3 The parts by weight are 99.95 parts, Li 2 O parts by weight are 0.05 parts.

Embodiment 2

[0021] Water washing of catalyst A in [Example 1], the mass ratio of catalyst A to distilled water was 5, treated at 80°C for 5 hours, and repeated twice. Dry at 120°C for 12 hours, and bake at 550°C for 10 hours to obtain the finished product B of ethanol dehydration to ethylene catalyst. Al in the catalyst 2 o 3 The parts by weight are 99.95 parts, Li 2 O parts by weight are 0.05 parts.

Embodiment 3

[0023] Pickling catalyst A in [Example 1], the mass ratio of catalyst A to 0.5% nitric acid aqueous solution was 5, treated at 80°C for 5 hours, and repeated 2 times. Dry at 120°C for 12 hours, and bake at 550°C for 10 hours to obtain the finished product C of ethanol dehydration ethylene catalyst. Al in the catalyst 2 o 3 The parts by weight are 99.95 parts, Li 2 O parts by weight are 0.05 parts.

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Abstract

The invention relates to a method for preparing ethylene by dehydrating ethanol, and the method is mainly used for solving the problems that in the prior art, because coking is easily formed on the surface of a catalyst, the catalyst is easy to inactivate and is short in service life, the selectivity of the ethylene is low, and byproducts (especially CO, CO2 and H2) are plentiful. The method comprises the following step: based on a 5-100wt % ethanol aqueous solution serving as a raw material, contacting the reaction raw material with the catalyst at the reaction temperature of 250-500 DEG C under the condition that the volume air speed is 0.1-25 hours<-1> relative to ethanol, so as to generate the ethylene, wherein the catalyst comprises the following components in parts by weight: a) 0.001-10 parts of at least one metal oxide selected from I A or II A and b) 90-99.999 parts of alumina. By using the technical scheme, the problem is well solved; and the method can be used in industrial production for 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. Ethanol dehydration rout...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/04C07C1/24
CPCY02P20/52
Inventor 杨为民徐菁金萍李亚男金照生
Owner CHINA PETROLEUM & CHEM CORP