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Catalyzer for preparing propylene from methanol or dimethyl ether in high selectivity and preparation method thereof

A high-selectivity, catalyst technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of unsuitable propylene as the target product MTP process and high ethylene selectivity

Active Publication Date: 2008-05-14
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Due to the purpose of producing low-carbon olefins (mainly ethylene and propylene), the ethylene selectivity on the existing modified ZSM-5 molecular sieve catalysts is very high, and these catalysts are not suitable for the MTP process with propylene as the target product.

Method used

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  • Catalyzer for preparing propylene from methanol or dimethyl ether in high selectivity and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Get ZSM-5 zeolite former powder 1000g (SiO 2 / Al 2 o 3 =200), the impregnation of La was carried out at room temperature. Lanthanum nitrate solution 1500g, La loading 3%, soak at room temperature for 24 hours, heat up to boiling, and stir at the same time, stop stirring when it becomes viscous, heat up to 120°C for drying, and then bake in air at 600°C for 3 hours , to obtain La / ZSM-5 zeolite. Weigh 1560g of 85% concentrated phosphoric acid (alkaline modifier), 1420g of pseudo-boehmite (binder) with a dry basis of 65%, 6000g of deionized water, stir and react for 20 minutes, add La / ZSM-5 Zeolite, stirring for 20 minutes, colloid mill grinding for 30 minutes, spray molding. Control the inlet temperature of the spray dryer to 400°C, the outlet temperature to 200°C, and the injection pressure to 2.0MPa. The formed catalyst microspheres were calcined at 600°C for 3 hours. After cooling, exchange with 0.1 mol / l hydrochloric acid, the ratio of liquid volume (ml) to cata...

Embodiment 2

[0020] Get ZSM-5 zeolite former powder 1000g (SiO 2 / Al 2 o 3 =200), the impregnation of La was carried out at room temperature. Lanthanum nitrate solution 1500g, La loading 3%, soak at room temperature for 24 hours, heat up to boiling, and stir at the same time, stop stirring when it becomes viscous, heat up to 120°C for drying, and then bake in air at 600°C for 3 hours , to obtain La / ZSM-5 zeolite. La / ZSM-5 zeolite was subjected to Mg leaching treatment using the same operation as leaching La, and the Mg loading was 3.2%. Weigh 3567g of kaolin with a dry basis content of 84%, 6000g of deionized water, and the above-mentioned PLA / ZSM-5 zeolite, stir for 30 minutes, grind with a colloid mill for 30 minutes, and spray to form. Other operations are the same as in Example 1. The prepared catalyst was labeled MTPC-2.

Embodiment 3

[0022] Catalyst preparation was carried out according to Example 2, and the silanization time was 2 hours. Catalyst MTPC-3 was prepared.

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Abstract

The invention relates to a catalyst for preparing propylene with a high selectivity using methanol or dimethyl ether and a preparation method, in particular to a fluidized bed catalyst for preparing propylene with a high selectivity using methanol or dimethyl ether which fits the manufacturing production and a preparation method thereof. The invention carries out a modification handling for the active component of ZSM-5 molecular sieve catalyst by means of stabilizing the molecular sieve structure with the lanthanon, changing the surface acidity with the alkaline matter, and adorning the porecanal with on-line silanization and other means, and prepares a fluidized bed catalyst for preparing propylene with a high selectivity after the sponging drying; the component of the catalyst is in the light of the weight percentage as follows, the rare-earth 0.1 to 8%, the alkalinity modifying agent 0.5 to 30%, the caking agent 20 to 80%, the silanization silicon 0.05 to 10%, the rest is ZSM-5 molecular sieve.

Description

technical field [0001] The invention relates to the technical field of catalysts, and relates to a fluidized bed catalyst suitable for industrial production and a preparation method for preparing propylene from methanol or dimethyl ether with high selectivity. Background technique [0002] Catalytic conversion of methanol or dimethyl ether to produce low-carbon olefins (MTO) such as ethylene and propylene is the most likely technical route to replace petroleum production of bulk chemicals. For example, US Patents 4,025,575, 4,083,889, 4,433,189, and 4,476,338 all describe a method for preparing light olefins from methanol using ZSM-5 molecular sieve as a catalyst. Due to the large pore size and strong surface acidity of ZSM-5 molecular sieve, when used as an MTO catalyst, the selectivity of low-carbon olefins such as ethylene and propylene is low, and by-products such as aromatics and paraffins will be produced. Although some other molecular sieves such as erionite, chabazi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40C07C11/06C07C1/20
CPCY02P20/52
Inventor 王华刘中民许磊吕志辉张今令袁翠峪李冰
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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