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N-alkene isomerization catalyst, method for preparing same and application of n-alkene isomerization catalyst

A technology for olefin isomerization and catalysts, which is applied in the field of normal olefin isomerization catalysts and its preparation, can solve problems such as high cost, performance degradation, and easy performance degradation, and achieves maintenance of yield, reduction of quantity, and reduction of other side effects The effect of the reaction

Active Publication Date: 2016-10-26
山东迅达化工集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing catalysts of this type have good n-butene conversion and isobutene selectivity in a short period of time, such as a few days, but the performance declines rapidly afterwards, so the single-pass operation cycle is short, and it needs to be regenerated frequently by burning, and the burnt After the performance is easy to drop
Many existing technologies have proposed various improvements, but usually the number of days of single-pass operation does not exceed 30 days, and the performance often declines significantly after one year of use, so the number of regenerations is large, the catalyst is replaced frequently, and the cost is high

Method used

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  • N-alkene isomerization catalyst, method for preparing same and application of n-alkene isomerization catalyst
  • N-alkene isomerization catalyst, method for preparing same and application of n-alkene isomerization catalyst
  • N-alkene isomerization catalyst, method for preparing same and application of n-alkene isomerization catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Use crystallized SAPO-11 molecular sieve raw powder and crystallized ZSM-5 molecular sieve raw material as raw materials; SAPO-11 molecular sieve raw powder is easy to disperse to an average particle size of 1.2um, crystallinity 95%, chemical composition P 2 o 5 41%, SiO 2 12%, Al 2 o 3 47% (mass); ZSM-5 molecular sieve raw powder is easily dispersed to an average particle size of 1.6um, a silicon-aluminum ratio of 70, and a crystallinity of 95%. Catalysts were prepared as follows:

[0027] A. Add 2.0kg of SAPO-11 molecular sieve raw powder, 0.5kg of ZSM-5 molecular sieve raw powder and 3.75kg of pseudo-boehmite dry powder into the 20L mixing tank, and mix well;

[0028] C. Take 5.0kg of the mixed powder and transfer it to a kneader, add 0.15kg of scallop powder and mix evenly, add 4.5kg of an aqueous solution containing 0.20kg of acetic acid and knead, extrude with a Φ2.0mm orifice plate, and then dry at 120°C for 6hr, 480 ℃ roasting for 3hr to obtain a catalyst...

Embodiment 2

[0032] Basically the same as Example 1, the difference is that in step A, the amount of SAPO-11 molecular sieve raw powder added is 2.125 kg, and the added amount of ZSM-5 molecular sieve raw powder is 0.375 kg.

[0033] Calculated from the feed ratio, the catalyst prepared in this example contains 50% (mass) of molecular sieves and 50% (mass) of alumina; SAPO-11 accounts for 85% (mass) of molecular sieves, and ZSM-5 accounts for 85% (mass) of molecular sieves. 15% (mass) of the total amount. Judging from the electron micrographs (SEM) of the surface and section of the catalyst, the particle size of the molecular sieve in the catalyst is 1-2um.

Embodiment 3

[0035] Basically the same as Example 1, the difference is that in step A, the amount of pseudo-boehmite dry powder added is 1.60kg, and in step C, take 2.5kg of mixed powder and add 0.075kg of scallop powder to mix, add 0.10kg of acetic acid in the aqueous solution 2.3kg.

[0036]Calculated from the feed ratio, the catalyst prepared in this example contains 70% (mass) of molecular sieves and 30% (mass) of alumina; SAPO-11 accounts for 80% (mass) of molecular sieves, and ZSM-5 accounts for 80% (mass) of molecular sieves. 20% of the total (mass). Judging from the electron micrographs (SEM) of the surface and section of the catalyst, the particle size of the molecular sieve in the catalyst is 1-2um.

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Abstract

The invention provides an n-alkene isomerization catalyst. The n-alkene isomerization catalyst comprises (by weight) 50-90% of molecular sieves and the balance aluminum oxide. The molecular sieves comprise (by weight) 75-90% of SAPO-11 and 10-25% of ZSM-5; the sizes of micro-particles of the molecular sieves in the n-alkene isomerization catalyst are 1-2 micrometers. The n-alkene isomerization catalyst has the advantages that the n-alkene isomerization catalyst is high in n-alkene isomerization activity and isoalkene yield, and the high isoalkene yield can be kept for a long time; the n-alkene isomerization catalyst is long in single-pass running period, low in repeated coke-burning regeneration performance decreasing range, suitable for procedures for preparing isobutylene from n-butene by means of isomerization reaction and procedures for preparing isopentene from n-pentene by means of isomerization reaction and particularly suitable for procedures for preparing isobutylene by means of post-ether carbon tetra-n-butene isomerization.

Description

technical field [0001] The invention belongs to the field of catalysts, and relates to a normal olefin isomerization catalyst and a preparation method and application thereof. Background technique [0002] Methyl tert-butyl ether (MTBE) has become an excellent gasoline additive because of its high octane number, low vapor pressure, and good solubility in gasoline fraction hydrocarbons in newly formulated gasoline and oxygenated gasoline. In recent years, its demand has increased rapidly in recent years, and the output of isobutene obtained by traditional petroleum catalytic cracking and thermal processing is far from meeting the needs of etherification unit production. [0003] The output material of the etherification unit producing MTBE, after methanol and ether are separated, has a normal butene content of more than 40%. Therefore, skeletal isomerization of the normal butene-rich material to produce isobutene can achieve the purpose of increasing isobutene production. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/85C07C5/27C07C11/09
CPCB01J29/005B01J29/40B01J29/85C07C5/2708C07C2529/85C07C11/09
Inventor 路新龙杨金帅胡文宾
Owner 山东迅达化工集团有限公司
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