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C8 aromatics isomerization catalyst and application thereof

An aromatic hydrocarbon isomerization and catalyst technology, applied in physical/chemical process catalysts, isomerization hydrocarbon production, molecular sieve catalysts, etc., can solve the problems of disproportionation reaction, low ethylbenzene conversion rate, low target product selectivity, etc. Conversion, high yield of C8 aromatics, effect of high commercial importance

Active Publication Date: 2015-02-18
THE NORTHWEST RES INST OF CHEM IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent US4482773 selects ZSM-5 zeolite, and the patent EP458378 describes a C8 aromatic hydrocarbon isomerization catalyst containing platinum active components and a H-type mordenite containing 2wt% to 3wt% alkali metals. Existing catalysts generally exist Target product selectivity is relatively low, ethylbenzene conversion rate is relatively low, disproportionation reaction and other serious problems

Method used

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  • C8 aromatics isomerization catalyst and application thereof
  • C8 aromatics isomerization catalyst and application thereof
  • C8 aromatics isomerization catalyst and application thereof

Examples

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Embodiment 1

[0040] The catalyst of this embodiment includes a carrier and platinum loaded on the carrier, the mass of the platinum is 0.25% of the carrier mass, and the carrier includes 50wt% alumina, 7.6wt% EU-1 molecular sieve and 42.4wt% ZSM-5 molecular sieve; SiO of the EU-1 molecular sieve 2 / Al 2 o 3 The molar ratio is 45, the SiO of the ZSM-5 molecular sieve 2 / Al 2 o 3 The molar ratio is 260, and the grain size of the ZSM-5 molecular sieve is not greater than 100nm.

[0041] The preparation method of present embodiment catalyst comprises the following steps:

[0042] Step 1: Mix EU-1 molecular sieve, ZSM-5 molecular sieve and alumina uniformly to obtain a mixture, knead the mixture with dilute nitric acid, extrude and dry, and then roast at 550°C for 4.5h to obtain a carrier ; The mass ratio of the mixture to the dilute nitric acid is 100:60, and the mass concentration of the dilute nitric acid is 0.5%;

[0043] Step 2, placing the carrier described in step 1 in an ammonium...

Embodiment 2

[0047] The catalyst of this embodiment includes a carrier and platinum loaded on the carrier, the mass of the platinum is 0.25% of the carrier mass, and the carrier includes 50wt% alumina, 7wt% EU-1 molecular sieve and 43wt% ZSM- 5 molecular sieve; the SiO of the EU-1 molecular sieve 2 / Al 2 o 3 The molar ratio is 45, the SiO of the ZSM-5 molecular sieve 2 / Al 2 o 3 The molar ratio is 260, and the grain size of the ZSM-5 molecular sieve is not greater than 100nm.

[0048] The preparation method of the catalyst of this embodiment is the same as that of Example 1.

Embodiment 3

[0050] The catalyst of this embodiment includes a carrier and platinum loaded on the carrier, the mass of the platinum is 0.25% of the carrier mass, and the carrier includes 50wt% alumina, 8wt% EU-1 molecular sieve and 42wt% ZSM- 5 molecular sieve; the SiO of the EU-1 molecular sieve 2 / Al 2 o 3 The molar ratio is 45, the SiO of the ZSM-5 molecular sieve 2 / Al 2 o 3 The molar ratio is 260, and the grain size of the ZSM-5 molecular sieve is not greater than 100nm.

[0051] The preparation method of present embodiment catalyst comprises the following steps:

[0052] Step 1: Mix EU-1 molecular sieve, ZSM-5 molecular sieve and alumina uniformly to obtain a mixture, knead the mixture with dilute nitric acid, extrude and dry, and then roast at 560°C for 4 hours to obtain a carrier; The mass ratio of the mixture and the dilute nitric acid is 100:65, and the mass concentration of the dilute nitric acid is 0.4%;

[0053] Step 2. Place the carrier described in step 1 in the ammon...

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Abstract

The invention discloses a C8 aromatics isomerization catalyst which comprises a carrier and platinum supported on the carrier, wherein the mass of platinum is 0.25% of that of the carrier; the carrier comprises 50wt% of aluminum oxide, 6wt%-9wt% of an EU-1 molecular sieve and 41wt%-44wt% of a ZSM-5 molecular sieve; the mole ratio of SiO2 to Al2O3 in the EU-1 molecular sieve is 45, and the mole ratio of SiO2 to Al2O3 of the ZSM-5 molecular sieve is 260. In addition, the invention also discloses application of the catalyst to C8 aromatics isomerization reaction. When the catalyst is used for catalyzing the C8 aromatics isomerization reaction, the concentration of p-xylene in a product is close to thermodynamic equilibrium concentration, and the catalyst has high ethylbenzene conversion rate and high p-xylene selectivity, and can maintain low loss of C8 aromatics.

Description

technical field [0001] The invention belongs to the technical field of petrochemical catalysts, and in particular relates to a C8 aromatic hydrocarbon isomerization catalyst and its application. Background technique [0002] C8 aromatics refer to the mixture of four isomers of p-xylene (PX), m-xylene (MX), o-xylene (OX) and ethylbenzene (EB). The main source of C8 aromatics is petroleum secondary processing The by-products of catalytic reforming and naphtha thermal cracking, or toluene disproportionation or transalkylation, etc. Since the boiling point of ethylbenzene is very close to that of xylene, if the ethylbenzene in xylene is directly separated by high-efficiency rectification or adsorption separation, the cost is very high. Because the separation of ethylbenzene is very difficult and costly, under normal circumstances, oil companies often choose to convert ethylbenzene into xylene while isomerizing C8 aromatics. [0003] In order to complete the conversion of ethyl...

Claims

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Application Information

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IPC IPC(8): B01J29/80C07C5/27C07C15/08
CPCY02P20/52
Inventor 顾建峰罗万明金德浩何观伟王军峰杜彩霞李铖徐西娥王新星崔楼伟
Owner THE NORTHWEST RES INST OF CHEM IND
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