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Preparation method of methyl tert-butyl ether cracking catalyst for isobutene production

A technology of methyl tertiary butyl ether and catalyst is applied in the field of preparing isobutylene catalyst by methyl tertiary butyl ether cracking. Effects of force reduction, improved polarity, improved pore structure

Active Publication Date: 2014-10-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above two methods, the calcination temperature used is above 700°C to optimize the activity and selectivity of the catalyst, and when the calcination temperature is lower than 700°C, the activity of side reactions such as isobutylene polymerization or methanol dehydration of the obtained catalyst increases. This affects the selectivity of the catalyst, and at the same time affects the service life of the catalyst due to the deposition of polymers in the by-products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Aluminum hydroxide AH1 and Silicalite-1 molecular sieve crystallization liquid Si-1-A were mixed at a dry weight ratio of 1:10, rolled into balls, dried at 110°C for 3 hours, and calcined at 500°C for 4 hours to obtain H-1. Catalyst C-1 was obtained by treating H-1 with saturated water vapor at 200°C for 5 hours and drying at 110°C for 3 hours. Table 1 shows its physical and chemical properties.

Embodiment 2

[0031] Aluminum hydroxide AH1 and Silicalite-1 molecular sieve crystallization liquid Si-1-A were mixed at a weight ratio of 1:25 on a dry basis, rolled into balls, dried at 110°C for 3 hours, and calcined at 500°C for 4 hours to obtain H-2. Catalyst C-2 was obtained by treating H-2 with saturated water vapor at 200°C for 5 hours and drying at 110°C for 3 hours, and its physical and chemical properties are shown in Table 1.

Embodiment 3

[0033] Aluminum hydroxide AH2 and Silicalite-1 molecular sieve crystallization liquid Si-1-A were mixed at a dry weight ratio of 1:20, rolled into balls, dried at 110°C for 3 hours, and calcined at 500°C for 4 hours to obtain H-3. Catalyst C-3 was obtained by treating H-3 with saturated water vapor at 200°C for 5 hours and drying at 110°C for 3 hours, and its physical and chemical properties are shown in Table 1.

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Abstract

The invention discloses a preparation method for a catalyst used in production of isobutene through cracking of methyl tert-butyl ether (MTBE). According to the method, aluminum hydroxide colloid and Silicalite-1 molecular sieve crystallization liquid are mixed and molded and then undergo hydro-thermal treatment, and a resultant is used as the catalyst; preferably, the catalyst is loaded with a proper amount of active metal components; and the catalyst is used for cracking of MTBE for production of isobutene. The catalyst prepared in the invention has good catalysis performance, enables good selectivity on methanol and isobutene and a high conversion rate of MTBE to be obtained and inhibits generation of dimethyl ether, a reaction by-product.

Description

technical field [0001] The invention relates to a catalyst for producing isobutylene by cracking methyl tert-butyl ether and a preparation method thereof. Background technique [0002] Isobutene is an important organic chemical raw material. High-purity isobutene is widely used in the production of butyl rubber, polyisobutene and other products. Methyl tert-butyl ether (MTBE) cracking to produce high-purity isobutene is an advanced and economical method among many production methods. A better method. The by-product of MTBE cracking, dimethyl ether, is the main factor affecting the purity of the product isobutylene. When the product isobutylene is used to produce butyl rubber, the requirements for its dimethyl ether content are particularly strict. Therefore, it is the core of this technology to develop a catalyst with excellent MTBE cracking conversion rate and isobutene selectivity to minimize or not generate dimethyl ether and reduce the burden of subsequent separation of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/035C07C11/09C07C1/20
CPCY02P20/52
Inventor 张淑梅乔凯翟庆铜陈明郭长新王春梅
Owner CHINA PETROLEUM & CHEM CORP
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