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Catalyst for preparing isobutene by methyl tert-butyl ether cracking, preparation method, and application thereof

A technology for methyl tertiary butyl ether and isobutylene, which is applied to a catalyst for preparing isobutylene by cracking methyl tertiary butyl ether and its preparation and application fields, can solve the problem of increasing production cost and efficiency, reducing MTBE conversion rate, affecting isobutylene selectivity, etc. problems, to achieve the effect of saving steps and devices, long operation cycle and high selectivity

Active Publication Date: 2012-05-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the MTBE cracking reactor is a tubular fixed-bed reactor, the catalyst is packed in the tube, and the heat required for the reaction is provided by the heat carrier outside the tube. , the lower the pressure is, the more favorable the reaction is. The main product isobutene is obtained from the reactor in gaseous form. The isobutene needs to be pressurized and liquefied by a compressor and sent to the separation system. The separation system is complicated, difficult to operate and consumes electricity, which virtually increases Production cost and efficiency
From an economic point of view, it is hoped that isobutene will be in a liquid state when the product is separated, which requires that the reaction pressure be greater than the saturated vapor pressure of isobutene at normal temperature, but if the reaction pressure is increased, the conversion of MTBE will be reduced by using existing catalysts, and even affect isobutene. selectivity

Method used

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  • Catalyst for preparing isobutene by methyl tert-butyl ether cracking, preparation method, and application thereof
  • Catalyst for preparing isobutene by methyl tert-butyl ether cracking, preparation method, and application thereof
  • Catalyst for preparing isobutene by methyl tert-butyl ether cracking, preparation method, and application thereof

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Experimental program
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Effect test

preparation example Construction

[0024] The preparation method of amorphous silicon aluminum W-1 is as follows: immerse 50g of amorphous silicon aluminum into 100mL Be(NO 3 ) 2 In the aqueous solution, the concentration of the solution is 0.1 mol / L, and after being immersed, it is calcined at 400° C. for 6 hours to obtain amorphous silicon aluminum containing 3 wt% of beryllium oxide.

[0025] The preparation method of amorphous silicon-aluminum W-2 is as follows: immerse 50g of amorphous silicon-aluminum into 100mL Ni(NO 3 ) 2 In the aqueous solution, the concentration of the solution is 0.1 mol / L, and after being immersed, it is calcined at 400° C. for 6 hours to obtain amorphous silicon aluminum containing 0.6 wt% of nickel oxide.

[0026] The preparation of amorphous silicon-aluminum W-3 adopts a step-by-step method: 50g of amorphous silicon-aluminum is immersed in 100mLBe(NO 3 ) 2 In the aqueous solution, the concentration of the solution is 0.1 mol / L, and it is calcined at 400°C for 6 hours after immersion. T...

Embodiment 1

[0037] The high-pressure MTBE cracking test will be carried out through the above-mentioned catalysts (except catalyst W-3-0). The specific test conditions and test results are shown in Table 3.

[0038] table 3

[0039] Catalyst

[0040] Note: The selectivity of methanol and isobutylene are both greater than 99%.

Embodiment 2

[0045] The life test results of catalyst W-3-1 are shown in Table 5.

[0046] table 5

[0047]

[0048] It can be seen from Table 5 that the activity stability of the catalyst W-3-1 is very good, the activity is basically stable in the first 7000 hours of operation test, and the activity is slightly decreased after 1000 hours.

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Abstract

The present invention discloses a catalyst for preparing isobutene by methyl tert-butyl ether (MTBE) cracking, a preparation method, and an application thereof. According to the method, amorphous silicon-aluminum is subjected to a hydrothermal treatment by using water vapor containing oxalic acid to obtain the catalyst. According to the present invention, when the catalyst is adopted for preparing the isobutene by the MTBE cracking, the reaction can be completed at high pressure; the product isobutene flows into a following separation system with the self-pressure, and a compressor is not required to press the product isobutene into the liquid phase, such that the operating cost is saved, and the conversion rate of the MTBE and the selectivity of the isobutene are high.

Description

Technical field [0001] The invention relates to a catalyst for preparing isobutylene by the cracking of methyl tert-butyl ether, and a preparation method and application thereof. Background technique [0002] Isobutylene is an important organic chemical raw material. High-purity isobutylene is widely used in the production of butyl rubber, polyisobutylene and other products, and methyl tert-butyl ether (MTBE) cracking to produce high-purity isobutylene is the most technologically advanced and economical among many production methods. A better method. The development of a catalyst with excellent MTBE cracking conversion rate and isobutylene selectivity is the core of this technology. [0003] At present, the catalysts with better performance for MTBE cracking include: alumina catalyst, silica catalyst, ion exchange resin catalyst (such as DE 3509292, DE 3210435, US 4447668, GB 1482883, US 4570026, US 4551567), sulfate Catalysts (such as JP 7626401), activated carbon catalysts (suc...

Claims

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Application Information

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IPC IPC(8): B01J21/12B01J23/04B01J23/44B01J23/42B01J23/755C07C11/09C07C1/20
Inventor 张淑梅陈明翟庆铜乔凯郭长新王春梅
Owner CHINA PETROLEUM & CHEM CORP
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