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Preparation method of molecular sieve catalyst used for preparing dimethylamine

A molecular sieve and catalyst technology, applied in the field of preparation of molecular sieve catalysts, can solve problems such as no reports on catalyst preparation methods.

Active Publication Date: 2012-06-27
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] The present invention reports a preparation method of a catalyst for the selective production of dimethylamine by gas-phase amination of methanol using molecular sieve as a raw material. The catalyst has good activity, selectivity and service life. So far, no similar catalyst preparation method has been reported.

Method used

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  • Preparation method of molecular sieve catalyst used for preparing dimethylamine

Examples

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Effect test

Embodiment 1

[0052] Weigh 150g of the catalyst A-1 in Comparative Example 1, put it into the cyclohexane solution of silicon tetrachloride for equal volume impregnation, the concentration of the silicon tetrachloride solution is 0.12mol / L, the impregnation temperature is 40°C, and the impregnation time is for 3 hours, then slowly heat up to 100°C and dry for 8 hours. During the drying process, the cyclohexane in the tail gas is absorbed by acetone and recovered by rectification. The catalyst is named A-2;

Embodiment 2

[0054] Weigh 25g of the catalyst A-2 in Example 1, put it into a potassium chloride solution with a concentration of 0.01mol / L for ion exchange, the exchange temperature is 80°C, the exchange time is 0.75h, and the liquid-solid ratio is 10:1 , filtered and washed, dried at 120°C for 10h, and programmed to heat up to 450°C for 3h. The catalyst is named A-3;

Embodiment 3

[0056] Weigh 25g of the catalyst A-2 in Example 1, put it into a magnesium chloride solution with a concentration of 0.01mol / L for ion exchange, the exchange temperature is 80°C, the exchange time is 0.5h, the liquid-solid ratio is 10:1, filter Wash, dry at 120°C for 10 hours, and heat up to 450°C for 3 hours. The catalyst is named A-4;

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Abstract

The invention relates to a preparation method of a molecular sieve catalyst used for preparing dimethylamine. The invention mainly provides a preparation method of a catalyst with high methanol conversion rate, high dimethylamine selectivity and long service life. The method comprises: subjecting a molecular sieve and pseudoboehmite, as well as dilute nitric acid to pre-molding roasting, and conducting isometric impregnation with a cyclohexane solution of silicon tetrachloride, then conducting treatment with one or several of alkali metal, alkaline earth metal and rare earth metal ion exchange, and steam treatment, thus obtaining the molecular sieve catalyst that can reach the above three requirements at the same time.

Description

technical field [0001] The invention relates to the technical field of molecular sieve catalysts, in particular to a preparation method of a molecular sieve catalyst used for selectively preparing dimethylamine from methanol and ammonia. technical background [0002] Methylamine (monomethylamine, dimethylamine and trimethylamine) is an important class of basic fine organic chemical raw materials. It is an ideal downstream product of ammonia and methanol. It is widely used in pesticides, medicines, rubber, leather, synthetic dyes, synthetic In the production of resins, chemical fibers, solvents, surfactants, high-efficiency fuels, photographic materials, etc. [0003] The traditional equilibrium catalytic process uses γ-Al 2 o 3 or SiO 2 -Al 2 o 3 Amorphous solid acid catalysts such as methanol and ammonia gas-phase catalytic amination process to produce monomethylamine, dimethylamine, and trimethylamine. Product distribution is controlled by thermodynamic equilibrium, ...

Claims

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Application Information

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IPC IPC(8): B01J29/70B01J29/18B01J29/40B01J29/08C07C211/04C07C209/16
Inventor 范景新于海斌臧甲忠王银斌刘冠锋邢淑建聂枫赵虹
Owner CHINA NAT OFFSHORE OIL CORP
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