Olefin isomerization catalyst passivation treatment method

A technology for olefin isomerization and passivation treatment, which is applied in the direction of physical/chemical process catalysts, catalyst protection, isomerization hydrocarbon production, etc. It can solve the problem that the output of isobutene cannot meet the needs of the production of etherification units, so as to improve the output efficiency and selectivity, inhibition of polymerization, and promotion of isomerization

Active Publication Date: 2014-05-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Since methyl tert-butyl ether (MTBE) and ethyl tert-butyl ether (ETBE) show high octane number, low vapor pressure and good performance in gasoline distillate hydrocarbons in reformulated gasoline and oxygenated gasoline Solubility makes it an excell

Method used

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  • Olefin isomerization catalyst passivation treatment method
  • Olefin isomerization catalyst passivation treatment method
  • Olefin isomerization catalyst passivation treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Dry mix HZSM-35 molecular sieve and pseudo-boehmite, then drop nitric acid aqueous solution to make extrudable material, wherein the weight ratio of HZSM-35 molecular sieve / pseudo-boehmite is 1:1. The mixed materials were extruded into strips with a diameter of 2mm, dried at 120°C for 2 hours, and calcined at 540°C for 4 hours to obtain HZSM-35 acidic molecular sieve catalyst.

Embodiment 2

[0031] The catalyst prepared in Example 1 was loaded into a fixed bed reaction evaluation device, and under the conditions of a temperature of 320° C. and a pressure of 0.15 MPa, the -1 The mass space velocity is passed into the heavy component of n-butene isomerization process by-product (i.e. passivating agent, mainly containing 20% ​​by weight of C 5 , 10 wt% C 6 , 65% by weight of C 8 and a small amount of C 7 and C 9 , where C 5 、C 6 、C 7 、C 8 、C 9 Respectively represent hydrocarbon compounds containing 5, 6, 7, 8, 9 carbon atoms; the passivating agent used below has the same composition) contact with the catalyst and passivate for 5 hours. Stop the feed of passivating agent, calculated as n-butene for 1.0h -1 After the mass space velocity is passed into ether, mixed carbon four (containing 43.93% by weight of n-butene, 9.82% by weight of trans-2-butene, 6.16% by weight of cis-2-butene, 2.36% by weight of isobutene, 22.72 weight % of isobutane, 15.02 weight % of...

Embodiment 3

[0033] The specific implementation process is roughly the same as in Example 2, except that the temperature is changed to 350° C., and the results are shown in Table 1.

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Abstract

The invention relates to an olefin isomerization catalyst passivation treatment method which is as follows: a passivation agent is led alone, or led simultaneously with an olefin isomerization reaction raw material, into a catalyst bed for contacting with a catalyst for 2-10 hours, the passivation agent is a by-product of an olefin isomerization process, and preferably is a heavy component in by-products. By means of the passivation treatment method, the problems that the initial-stage reaction activity of the catalyst in the olefin isomerization reaction is high, polymerization side reactions are serious, the catalyst bed temperature is risen, and the like can be solved, and the yield and selectivity of isomerization target products can be effectively improved. At the same time, because the passivation agent used is the by-product of the olefin isomerization process itself, the passivating agent after use can directly enter into follow-up processes together with the isomerization products, energy sources of a reaction system itself can be fully used, the postprocessing process is simplified, the pollution is reduced, and the cost is reduced. In addition, the method has the advantages of simple operation, easy control of the process and good passivation effect.

Description

technical field [0001] The invention relates to a pretreatment method for an olefin isomerization catalyst, in particular to a passivation treatment method for an olefin isomerization catalyst. Background technique [0002] Since methyl tert-butyl ether (MTBE) and ethyl tert-butyl ether (ETBE) show high octane number, low vapor pressure and good performance in gasoline distillate hydrocarbons in reformulated gasoline and oxygenated gasoline Solubility makes it an excellent gasoline additive component, and its demand is increasing rapidly around the world, so that the output of isobutene obtained by traditional petroleum catalytic cracking and thermal processing is far from meeting the needs of etherification unit production. [0003] In the outlet material of the etherification unit producing MTBE, after methanol and ether are separated, normal olefins account for 40-100% by weight, so this stock rich in n-butene is subjected to skeletal isomerization to produce isobutene. ...

Claims

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Application Information

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IPC IPC(8): B01J33/00B01J29/65B01J29/85C07C11/09C07C5/27
Inventor 任行涛栗同林裴庆君杨光张利霞伦志红
Owner CHINA PETROLEUM & CHEM CORP
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