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Normal olefin isomerization catalyst and its preparation method and application

An olefin isomerization and catalyst technology, which is applied in the field of normal olefin isomerization catalyst and its preparation, can solve the problems of easy performance decline, performance decline and high cost, so as to reduce other side reactions, reduce the quantity and maintain the yield Effect

Active Publication Date: 2018-11-16
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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  • Normal olefin isomerization catalyst and its preparation method and application
  • Normal olefin isomerization catalyst and its preparation method and application
  • Normal olefin isomerization catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Use SAPO-11 molecular sieve powder after crystallization treatment and ZSM-5 molecular sieve powder after crystallization treatment as raw materials; SAPO-11 molecular sieve raw powder is easily dispersed 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 powder is easy to disperse to an average particle size of 1.6um, a silicon-to-aluminum ratio of 70, and a crystallinity of 95%. The catalyst was prepared as follows:

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

[0028] C. Take 5.0kg of the mixed powder and transfer it to the kneader, add 0.15kg of sesame powder and mix well, add 4.5kg of aqueous solution containing 0.20kg of acetic acid and knead it with a Φ2.0mm orifice plate, then dry at 120℃ for 6hr, 480 Roasted at ℃ for 3hr to prepare semi-...

Embodiment 2

[0032] It is basically the same as in Example 1, except that in step A, the original SAPO-11 molecular sieve powder is added in an amount of 2.125 kg and the original ZSM-5 molecular sieve powder is added in an amount of 0.375 kg.

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

Embodiment 3

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

[0036] Calculated from the feed ratio, the catalyst prepared in this example contains 70% (mass) molecular sieve and 30% (mass) alumina; SAPO-11 accounts for 80% (mass) of the total molecular sieve, and ZSM-5 accounts for molecular sieve 20% of the total (mass). Judging from the electron micrographs (SEM) of the surface and cross-section of the catalyst, the 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 tertiary butyl ether (MTBE) has high octane number and low vapor pressure in newly formulated gasoline and oxygenated gasoline, and has good solubility in gasoline distillate hydrocarbons, so it becomes an excellent gasoline additive group. In recent years, its demand has increased rapidly, and the output of isobutylene obtained from traditional petroleum catalytic cracking and thermal processing is far from meeting the needs of etherification plant production. [0003] After separating methanol and ether, the export material of the etherification device for producing MTBE has a normal butene content of more than 40%. Therefore, the skeletal isomerization of the normal butene-rich material to produce isobutene can achieve the purpose of increasing the production of isobute...

Claims

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Application Information

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Patent Type & Authority Patents(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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