A kind of shaped molecular sieve catalyst and its preparation method and application

A molecular sieve and catalyst technology, which is applied in the field of shaped molecular sieve catalysts and their preparation, to achieve the effects of improving performance, simplifying operating procedures, and improving anti-coking performance

Active Publication Date: 2019-09-17
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method saves investment and reduces environmental pollution by reusing the crystallization slurry. However, since the patent uses spray drying to prepare a fluidized catalyst, the mechanical properties of the obtained catalyst are suitable for fluidized bed processes but not for fixed beds. Process catalyst

Method used

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  • A kind of shaped molecular sieve catalyst and its preparation method and application
  • A kind of shaped molecular sieve catalyst and its preparation method and application
  • A kind of shaped molecular sieve catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment HZ1-HZ4

[0061] Select the molecular sieve solution with a silicon-aluminum ratio of 200 and a particle size of about 150nm after crystallization and perform membrane filtration. After the pH of the filtrate is between 7-8, the water content is 10%, 25%, respectively. 35%, 50% molecular sieve slurry, mix the slurry with pseudo-boehmite, nitric acid solution and safflower powder according to the following mass ratio, the mass ratio of molecular sieve dry base to pseudo-boehmite is 7:3, nitric acid solution (containing The mass of water in the molecular sieve solution is 50% of the total mass of molecular sieve dry base and pseudo-boehmite, and the mass of safflower powder is 1% of the total mass of molecular sieve dry base and pseudo-boehmite. Stir evenly and carry out extrusion molding , After drying at 100°C, bake at 600°C for 6 hours. The obtained sample was treated with 1mol / L NH 4 Cl was exchanged at 90°C for 2 hours, and then dried and calcined under the same conditions. After t...

Embodiment HZ5-HZ7

[0063] Select a molecular sieve slurry with a silicon-aluminum ratio of 500, a particle size of 50nm, a water content of 10%, and a pH between 7-8, and mix the slurry with kaolin, nitric acid solution, and scallion powder according to the following mass ratios. Molecular sieve dry basis The mass ratio of kaolin is 8:2, 7:3, 6:4, the mass of nitric acid solution (including water in molecular sieve slurry) is 50% of the total mass of molecular sieve dry basis and pseudo-boehmite, and the mass of squid powder is molecular sieve Dry basis and 1% of the total mass of pseudo-boehmite, stirred evenly, extruded, dried at 100°C, and then calcined at 600°C for 6 hours. The obtained sample was treated with 1mol / L NH 4 Cl was exchanged at 90°C for 2 hours, and then dried and calcined under the same conditions. After two exchanges, shaped molecular sieve catalysts HZ5-HZ7 are finally obtained.

Embodiment HZ8-HZ9

[0065] Select the molecular sieve slurry with a silicon-aluminum ratio of 100, a particle size of 500nm, a water content of 25%, and a pH between 7-8 (the slurry is mixed with activated alumina, kaolin, nitric acid solution and scallop powder according to the following mass Proportional mixing, the mass ratio of molecular sieve dry basis to binder is 7:3, the mass of nitric acid solution (including water in molecular sieve slurry) is 50% of the total mass of molecular sieve dry basis and binder, and the mass of squid powder is molecular sieve dry basis 1% of the total mass of the binder, stirred evenly and extruded, dried at 100°C and then roasted at 600°C for 6 hours. The obtained sample was mixed with 1mol / L NH 4 Cl was exchanged at 90°C for 2 hours, and then dried and calcined under the same conditions. After two exchanges, shaped molecular sieve catalysts HZ8-HZ9 are finally obtained.

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Abstract

The invention provides a molded molecular sieve catalyst and a preparation method and an application thereof; the method includes the following steps: (1) filtering, washing and separating a molecular sieve solution after crystallization in molecular sieve synthesis, to obtain a molecular sieve slurry; preferably, washing and separating the molecular sieve with membrane separation; (2) mixing the molecular sieve slurry obtained in the step (1) with a binder, adding an extrusion aid and an adhesive solvent, and processing and molding to obtained a molded catalyst; and (3) drying, carrying out ion exchange and roasting the molded catalyst obtained in the step (2), to obtain the molded molecular sieve catalyst, wherein preferably, the drying temperature is 50-120 DEG C, more preferably 100 DEG C; and preferably, the roasting is carried out for 5-7 h at the temperature of 550-650 DEG C, more preferably the roasting is carried out for 6 h at the temperature of 600 DEG C. The catalyst prepared by the method has the characteristic of high dispersion of an active phase, the performance of the catalyst is greatly improved, and the activity in methanol conversion preparation of propylene is more excellent.

Description

technical field [0001] The invention relates to the field of molecular sieve preparation, in particular to a shaped molecular sieve catalyst and its preparation method and application. Background technique [0002] Propylene is an important basic chemical raw material, its traditional production depends on petroleum processing, and the shortage of petroleum resources promotes the development of non-petroleum route propylene production process. In recent years, the conversion of coal-based methanol and / or dimethyl ether to propylene (MTP) with a solid acid catalyst has attracted increasing attention. As a new process for propylene production, the MTP process has the advantages of wide sources of raw materials, high propylene yield, and easy co-production of polypropylene or other propylene derivatives. It is especially suitable for my country's energy structure with more coal, less gas, and less oil. It has important The application value is an important supplement to my coun...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/40C07C11/06C07C1/20B82Y30/00B82Y40/00
Inventor 巩雁军宋宇张兰兰马通赵晓萌张少龙展江宏徐新良徐亚荣陈蓝天许磊龚涛张晓飞
Owner PETROCHINA CO LTD
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