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Catalyst for methanol dewatering for preparing dimethyl ether and preparation method thereof

A methanol dehydration and catalyst technology, applied in the chemical field, can solve the problems of easy carbon deposition and deactivation on the surface of aluminum phosphate, restrictions on the production and use of dimethyl ether, and high cost of molecular sieves, and achieve long-term stable catalytic activity, significant economic benefits and environmental protection. Benefit, the effect of simple and easy preparation process

Inactive Publication Date: 2011-05-11
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as far as the current catalysts are concerned, the surface of aluminum phosphate is prone to carbon deposition and deactivation, and the cost of ZSM-5, ZSM-11 and molecular sieves is high, and γ-Al 2 o 3 The high reaction temperature leads to the restriction of the production and use of dimethyl ether

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 10 g of bentonite was immersed in an aqueous solution containing 0.5 g of sulfuric acid for 5 hours, filtered, washed with distilled water, and calcined at 250° C. for 4 hours to obtain a catalyst (modifier content = 5 mass%).

[0022] Take 1g of 60-80 mesh such catalyst and add it to the fixed bed reactor. Then nitrogen gas was introduced at a rate of 20 ml / min while adjusting the reactor temperature to 250°C. Set the methanol mass space velocity to 1h -1 Through the catalyst bed, the reactor was kept at normal pressure and 250°C. The results are shown in Table 1.

Embodiment 2

[0024] The catalyst used was the same as in Example 1, except that the added sulfuric acid was 0.25 g to obtain a catalyst (modifier content = 2.5% by mass). Then, as in Example 1, the determination of dimethyl ether production by methanol dehydration to dimethyl ether experiment was carried out. The results are shown in Table 1.

Embodiment 3

[0026] The catalyst used was the same as in Example 1, except that the added sulfuric acid was 0.05 g to obtain a catalyst (modifier content = 0.5% by mass). Then, as in Example 1, the experiment of methanol dehydration to dimethyl ether was carried out. The results are shown in Table 1.

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Abstract

The invention provides a catalyst for preparing dimethyl ether by methanol dehydration and preparation method thereof. The catalyst is prepared from bentonite as the major raw material by adding a small amount of modifier. The preparation method includes adding bentonite into the aqueous solution to obtain even slurry; adding a required amount of modifier, and evenly mixing; impregnating in waterbath; filtering; washing in water; drying; and calcining in a muffle furnace to obtain the catalyst. The catalyst adopts bentonite as the raw material and has the advantages of low cost, simple preparation process, excellent performance, less pollution, and remarkable economic and environmental-friendly benefit.

Description

Technical field [0001] The invention belongs to the field of chemistry, and more specifically relates to a catalyst used for methanol dehydration to prepare dimethyl ether and a preparation method thereof. Background technique [0002] Dimethyl ether is an important clean energy and environmentally friendly product. Because of its high cetane number and high oxygen content, the combustion process can achieve low black smoke and low NO x Emissions and reduction of engine noise can be used as an excellent substitute for diesel. Dimethyl ether can be compressed into a liquid under normal temperature and high pressure, and its properties are similar to that of petroleum liquefied gas phase, so it can also be used as a civil fuel. It can also replace Freon as aerosol, foaming agent, refrigerant, etc., and has a zero destruction coefficient to the ozone layer. Therefore, the development and application of dimethyl ether has practical social and economic benefits. [0003] The first met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/053B01J21/16C07C43/04C07C41/09
Inventor 林诚李智安
Owner FUZHOU UNIV
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