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Catalyst for dimethyl ether preparation through methanol dehydration, its preparation method and application

A methanol dehydration and catalyst technology, which is applied in the dehydration of hydroxyl compounds to prepare ethers, ether preparations, molecular sieve catalysts, etc., can solve problems such as not emphasizing the role of molecular sieve pore structure, and achieve industrial production and application. The production process is simple and stable good sex effect

Active Publication Date: 2012-05-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] It is known from the prior art that the catalyst for the dehydration of methanol with molecular sieve as the active component to prepare dimethyl ether does not emphasize the role of molecular sieve pore structure, such as FAU structure zeolite and Beta zeolite with three-dimensional macroporous structure, which have three-dimensional mesopore structure ZSM-5 and SAPO-34 with a three-dimensional small pore structure, etc., to generate dimethyl ether with high selectivity, the general technology adopted is to adjust the acidity of molecular sieves, or to combine different molecular sieves, or to modify molecular sieves

Method used

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  • Catalyst for dimethyl ether preparation through methanol dehydration, its preparation method and application

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Experimental program
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Embodiment 1

[0022] The first step: exchange 50g of Y-β composite molecular sieve with a relative content of 50% of the β zeolite component with 1.0L of ammonium nitrate salt solution with a concentration of 1.0mol / L for 3.0h under the condition of a constant temperature water bath at 80°C to make an ammonium type Y-β composite molecular sieve. Then wash, dry, and repeat the above process. Then the ammonium type Y-β composite molecular sieve after two exchanges was calcined at 550° C. for 4 hours in an air atmosphere. Then the ammonium type Y-β composite molecular sieve after being burned repeats the above-mentioned ammonium solution exchange process, and then is washed, dried, and then roasted at 550° C. for 4 hours in an air atmosphere. A hydrogen-type Y-β composite molecular sieve is prepared.

[0023] The second step: the obtained hydrogen-type Y-β composite molecular sieve, silicon dioxide, sage powder and water are mixed and kneaded, and extruded into a strip-shaped catalyst of 1.5...

Embodiment 2

[0026] Implementation process is except following difference, and all the other are all the same with embodiment 1:

[0027] In the first step, the temperature of the constant temperature water area is 75° C., and the concentration of the ammonium nitrate solution is 1.5 mol / L.

[0028] In the second step, the weight ratio of Y-β composite molecular sieve to binder is 80%:20% on a dry basis to obtain a catalyst product.

Embodiment 3

[0030] Implementation process is except following difference, and all the other are all the same with embodiment 1:

[0031] In the first step, the concentration of the ammonium nitrate solution is 1.5mol / L, the exchange time is 3.0h, and the temperature of the two times of burning is 600°C.

[0032] In the second step, the dry basis weight ratio of Y-β composite molecular sieve to binder is 50%:50%, and the catalyst product is prepared.

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Abstract

The invention discloses a catalyst for dimethyl ether preparation through methanol dehydration, its preparation method and application. The catalyst is composed of 30%-80% (dry basis weight) of a molecular sieve and 70%-20% (dry basis weight) of a binder, wherein, the molecular sieve is a Y-beta composite molecular sieve, and the binder is silica. The preparation method consists of: subjecting the hydrogen type Y-beta composite molecular sieve, the binder, a lubricating agent, and water to kneading and molding, then conducting drying and roasting so as to obtain the catalyst with high activity, high selectivity and good stability. The production process of the catalyst in the invention is simple, thus being in favor of industrial production and application.

Description

technical field [0001] The invention relates to a catalyst for preparing dimethyl ether by methanol dehydration, a preparation method and application thereof. Background technique [0002] Dimethyl ether (DME) is a class of ether chemical products. It is a colorless, non-toxic and environmentally friendly gas at normal temperature and pressure. It is widely used in industrial fields such as refrigeration, pharmaceuticals, dyes and pesticides. At the same time, dimethyl ether itself contains oxygen, has a short carbon chain, good combustion performance, high thermal efficiency, and its emission is lower than that of methanol and second only to hydrogen. It has great potential as a fuel to replace liquefied petroleum gas (LPG) and diesel, and is called the fuel of the 21st century. "Ultra Clean Energy". [0003] Under the catalysis of solid acid, the preparation of dimethyl ether by methanol dehydration is a common method for producing dimethyl ether technology at present. T...

Claims

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Application Information

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IPC IPC(8): B01J29/80C07C43/04C07C41/09
Inventor 秦波张志智张喜文凌凤香孙万付
Owner CHINA PETROLEUM & CHEM CORP
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