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Catalyst for preparing tert-olefins by cracking tert-alkyl ethers, preparation method and application thereof

A tertiary alkyl ether and catalyst technology, which is applied in the field of preparation of the catalyst, can solve the problems of increased device operation, increased energy consumption, pipeline blockage, etc., and achieves low raw material consumption, high feed liquid space velocity, and low equipment investment Effect

Active Publication Date: 2009-09-16
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Some activated carbon catalysts need to be used at a higher reaction temperature. In addition to increasing energy consumption, it is also easy to coke the heat transfer oil in the heating system and cause pipeline blockage, which adds some trouble to the operation of the device.

Method used

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  • Catalyst for preparing tert-olefins by cracking tert-alkyl ethers, preparation method and application thereof
  • Catalyst for preparing tert-olefins by cracking tert-alkyl ethers, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In the first step, 45.3g of ammonium sulfate was dissolved in 100ml of water, then 100ml of the same aluminum oxide used in Comparative Example 1 was put into the resulting ammonium sulfate aqueous solution and soaked for 2 hours at room temperature, then dried at 120°C for 2 hours after leaching, Then bake at 550°C for 4 hours in an air atmosphere to obtain sulfide-modified alumina; in the second step, dissolve 12.7g of ammonium fluoride in 100ml of water, and then dissolve 100ml of the sulfide-modified alumina obtained in the first step Alumina was immersed in the obtained ammonium fluoride aqueous solution at room temperature for 1.5 hours, dried at 120°C for 2 hours after leaching, and then calcined at 500°C for 3 hours in an air atmosphere to obtain catalyst C of the present invention. The content of sulfide in catalyst C was 5% by weight calculated as sulfur based on the weight of alumina, and the content of fluoride calculated as fluorine was 3% by weight based on...

Embodiment 2

[0038] In the first step, 6.4 g of ammonium fluoride was dissolved in 100 ml of water, and then 100 ml of the same aluminum oxide used in Comparative Example 1 was put into the resulting ammonium fluoride aqueous solution for immersion at room temperature for 1.5 hours, and then dried at 120° C. for 2 hours after leaching. hours, and then roasted at 450°C for 4 hours in a nitrogen atmosphere to obtain fluoride-modified alumina; in the second step, 45.3g of ammonium sulfate was dissolved in 100ml of water, and then 100ml of the fluoride-modified alumina obtained in the first step The aluminum oxide was put into the obtained ammonium sulfate aqueous solution and immersed at room temperature for 2 hours, dried at 120° C. for 2 hours after leaching, and then calcined at 500° C. for 4 hours in a nitrogen atmosphere to obtain catalyst D of the present invention. The content of sulfide in catalyst D was 5% by weight calculated as sulfur based on the weight of alumina and the content o...

Embodiment 3

[0040] In the first step, 45.3g of ammonium sulfate was dissolved in 100ml of water, then 100ml of the same aluminum oxide used in Comparative Example 1 was put into the resulting ammonium sulfate aqueous solution and soaked for 1.5 hours at room temperature, and then dried at 120°C for 2 hours after leaching. Then roast at 600°C for 7.5 hours in an air atmosphere to obtain sulfide-modified alumina; in the second step, dissolve 19.1g of ammonium fluoride in 100ml of water, and then dissolve 100ml of the sulfide-modified alumina obtained in the first step Alumina was immersed in the obtained ammonium fluoride aqueous solution at room temperature for 2 hours, dried at 120°C for 3 hours after leaching, and then calcined at 550°C for 2.5 hours in an air atmosphere to obtain catalyst E of the present invention. The content of sulfide in catalyst E was 5% by weight calculated as sulfur based on the weight of alumina and the content of fluoride calculated as fluorine was 4.5% by weigh...

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Abstract

The invention relates to a solid acid catalyst used in reactions for preparing tert-olefins by cracking tert-alkyl ethers, a preparation method and an application thereof, wherein the content of sulfides in the catalyst is calculated by sulfur and accounts for 0.1-15 percent by weight of the weight of alumina, and the content of fluorides is calculated by fluorine and accounts for 0.1-10 percent by weight of the weight of alumina. The catalyst uses sulfur compounds and solution containing fluorine compounds to process an alumina carrier and is prepared by filtration, drying and calcination. The catalyst is used in the reactions for preparing the tert-olefins by cracking the tert-alkyl ethers, for example, the reaction for preparing isobutene by cracking methyl tert-butyl ether, thereby having high conversion rate, high selectivity of tert-butene and joint product methanol, high product purity as well as good stability and being capable of being used under the condition of substantial increase of feed loads particularly.

Description

technical field [0001] The invention relates to a solid acid catalyst used for the reaction of tertiary olefins by cracking tertiary alkyl ethers, and further, the invention also relates to a preparation method and application of the catalyst. Background technique [0002] Tertiary olefins have become one of the important raw materials in the organic chemical industry. At present, isobutene in tertiary olefins has been widely used, and its social demand is increasing rapidly in recent years. Isobutylene can be used to manufacture dozens of chemical products such as butyl rubber, organic glass, antioxidants, adhesives, additives, coatings, and polyisobutylene. The cracking of methyl tert-butyl ether to produce isobutylene is a chemical produced from petrochemical plants. The process of preparing isobutene from carbon four fraction is advanced in technology, good in economic benefit and widely used. [0003] The reaction of tertiary alkyl ether cracking to produce tertiary o...

Claims

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Application Information

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IPC IPC(8): B01J27/12B01J27/053C07C11/02C07C1/20
CPCY02P20/52
Inventor 雷鸣杨怀军庄书红赵岚
Owner CHINA PETROLEUM & CHEM CORP
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