Aromatization catalyst and application thereof in highly selective preparation of p-xylene

A catalyst and aromatization technology, applied in physical/chemical process catalysts, isomerization to hydrocarbons, molecular sieve catalysts, etc., can solve the problems of reduction, lowering selectivity, crystal destruction, etc., to improve operation efficiency and suppress side reactions , improve the effect of selectivity

Active Publication Date: 2012-05-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the preparation process of the catalyst of the present invention, in order to reduce the carbon deposition in the use process of the catalyst and improve the stability of the catalyst, it is necessary to steam the catalyst (carrier) at 400°C to 650°C, which may lead to two deficiencies : First, due to high temperature water vapor treatment may lead to the destruction of some molecular sieve crystallization, which reduces the concentration of molecular sieve pore size distribution, thereby reducing the selectivity of the re...

Method used

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  • Aromatization catalyst and application thereof in highly selective preparation of p-xylene
  • Aromatization catalyst and application thereof in highly selective preparation of p-xylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The preparation method of catalyst (E-1) of the present invention is as follows:

[0035] (1) Preparation of lanthanum-containing molecular sieves

[0036] Use lanthanum nitrate and water to prepare a solution with a concentration of lanthanum oxide of 0.2 wt%, and add the calculated amount of solution to HZSM-5 (the molar ratio of silicon to aluminum is 80, and the specific surface area is 328m 2 / g, pore volume 0.18ml / g), the mixture was dried for 8 hours, then in an air atmosphere at 550 ° C, roasted for 6 hours to obtain a ZSM-5 molecular sieve with a lanthanum oxide content of 8 wt%, which is referred to as ZSM-5A here.

[0037] (2) Preparation of carrier

[0038] 400 grams of ZSM-5A, 200 grams of Sb 2 o 3 (analytically pure, produced by Shanghai Reagent No. 4 Factory), 400 grams (dry basis weight, the same below) of SB alumina powder (produced in Germany, the brand name is SB) and 24 grams of scallop powder are mixed evenly, then add 720ml of water, 36ml of Co...

Embodiment 2

[0042] Catalyst preparation method is the same as embodiment 1, and difference is that the content of molecular sieve in catalyst carrier is 60wt%, Sb 2 o 3 The content of the catalyst is 10wt%; the content of platinum, rhenium and zinc in the catalyst is different, and the catalyst number is C 2 , its composition is shown in Table 1, and the evaluation results are shown in Table 2.

Embodiment 3

[0044] Catalyst preparation method is the same as embodiment 1, and difference is that the content of molecular sieve in catalyst carrier is 80wt%, Sb 2 o 3 The content of the catalyst is 5wt%; the content of platinum, rhenium and zinc in the catalyst is different, and the catalyst number is C 3 , its composition is shown in Table 1, and the evaluation results are shown in Table 2.

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Abstract

The invention discloses an aromatization catalyst and application thereof in the highly selective preparation of p-xylene. The aromatization catalyst consists of a carrier and active metal components, the carrier contains at least one type of mesoporous molecular sieve, antimony oxide and inorganic refractory oxide, the mesoporous molecular sieve contains lanthanum oxide, the active metal components are platinum, rhenium and a third component, and the third component is at least one of gallium, zinc, indium and tin. The aromatization catalyst is used in the reforming process of the highly selective preparation of p-xylene with paraffin, cycloparaffin, alkene, or naphtha andor the like as raw oil material, and has the advantages of high stability, high p-xylene selectivity and the like.

Description

technical field [0001] The invention relates to an aromatization catalyst and its application in the high-selectivity preparation of p-xylene as raw materials such as saturated hydrocarbons, naphthenes, olefins and naphtha. Background technique [0002] Paraxylene (PX) is one of the main basic organic raw materials in the petrochemical industry, and it has a wide range of uses in many chemical production fields such as chemical fibers, synthetic resins, pesticides, medicines, and plastics. In recent years, with the rapid increase of terephthalic acid (PTA) production capacity, the supply of p-xylene in my country is in short supply and the price remains high. The PTA industry in Asia is developing rapidly, and the supply of PX in the region has become tense. In addition, due to the constant new construction plans in the Middle East, the growth of PX is also relatively fast. [0003] Because the traditional reforming catalyst is supported by amorphous alumina, the pore dist...

Claims

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Application Information

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IPC IPC(8): B01J29/48C10G35/095C07C15/08C07C5/27
CPCY02P20/52
Inventor 贾立明刘全杰徐会青张喜文王伟
Owner CHINA PETROLEUM & CHEM CORP
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