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Catalyst for preparing dimethyl ether by methanol dehydration and its preparation method

A technology of methanol dehydration and catalyst, which is applied in the direction of ether preparation, dehydration of hydroxyl-containing compounds to prepare ether, chemical instruments and methods, etc. It can solve the problems of catalyst crystal phase structure change, reduce catalyst strength and activity, etc., and achieve low activation temperature and easy operation. Effects in simple steps

Inactive Publication Date: 2007-02-28
ENN XINNENG BEIJING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, for the methanol dehydration system, the water content is high, and the catalyst reacts in the high water content system for a long time. The traditional γ-Al 2 o 3 The hydration reaction of the catalyst in the system changes the crystal phase structure of the catalyst, reducing the strength and activity of the catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Take 1000g of aluminum trichloride solution containing 3%wt of aluminum as solution A, use 20g each of lanthanum nitrate and cerium nitrate solutions containing La and Ce5%wt, 10g of calcium nitrate and magnesium nitrate solutions containing Ca and Mg3%wt, and stir And under appropriate heating, prepare acidic mixed solution B. First add 200 milliliters of deionized water into the reactor as the bottom water, and neutralize it with 8%wt ammonia solution D in a co-current feeding mode. Flow into the neutralization reaction, the pH value is controlled at 7.5 to 8.5, and the feeding time is about 30 minutes, then add 200 g of water glass solution C containing 18% of silicon dioxide, the feeding time is about 15 minutes, and the pH value is controlled at 8.5 to 9.5, aged for 1 hour. Wash with deionized water until the chloride ion content of the catalyst on a dry basis is less than 0.5%, and wash with a carbonate solution containing 0.05% and 0.01% of Na and K respectively...

Embodiment 2

[0042] Take 1000g of aluminum chloride solution containing 3%wt of aluminum, 20g of lanthanum nitrate and cerium nitrate solutions containing 5%wt of La and Ce, 5g of calcium chloride and magnesium chloride solution containing 3%wt of Ca and Mg, and prepare under stirring into an acidic mixed solution. Carry out neutralization, aging, and washing in the same manner as in Example 1 until the chloride ion content of the dry catalyst is less than 0.5%, and finally wash with a carbonate solution containing 0.05% and 0.01% Na and K respectively. The filter cake was dried at 120°C for 24 hours and crushed to 250 mesh. Then weigh 1.5%wt extrusion aid squash gum of the weight of the dry rubber powder made, and the two are fully mixed evenly. The mixed dry material is kneaded after adding 3% wt of dilute nitric acid as a binder, and the kneading time is 0.5 hour. It is formed by an extruder, and the shape is a clover shape of φ3mm. After drying for 12 hours, it was calcined at 550° C...

Embodiment 3

[0046] Get 1000g of aluminum chloride solution containing 3%wt of aluminum, 10g of lanthanum chloride and cerium chloride solution containing La and Ce6%wt, 5g of calcium chloride and magnesium chloride solution containing Ca and Mg3%wt, and stir Prepared into an acidic mixed solution. Carry out neutralization, aging, and washing in the same manner as in Example 1 until the chloride ion content of the dry catalyst is less than 0.5%, and finally wash with a hydroxide solution containing 0.1% and 0.05% of Na and K respectively. The filter cake was dried at 120°C for 24 hours and crushed to 250 mesh. Then weigh 1.5%wt extrusion aid squash gum of the dry rubber powder made, and fully mix the two evenly. The mixed dry material is kneaded after adding aluminum sol containing 3%wt of aluminum as a binder. The amount of aluminum sol added is based on the suitable extrusion molding. The kneading time is 0.5 hours, and it is formed by an extruder. The shape is φ2mm of bars. After dry...

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Abstract

The invention discloses a dimethyl ether catalyst and preparing method through hydrating hydration tolerance and carbon deposit resistance carbinol, which is characterized by the following: adding rare earth element La and Ce in the catalyst to improve catalyst hydration tolerance stable property, adding Ca, Mg, Na and K to improve carbon deposit resistance of catalyst.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to a preparation method of a catalyst for producing dimethyl ether by dehydration of methanol. Background technique [0002] Dimethyl ether is a widely used ether in the chemical industry. It has the characteristics of non-toxicity, safety, and high calorific value. It can be used as rocket propellant, diesel engine fuel, civil fuel, and is also an intermediate of coal-based liquid fuel. At the same time, it is also an important basic chemical intermediate, which has a wide range of uses in pharmaceuticals, pesticides, dyes, and daily chemicals. The earliest method of producing dimethyl ether is to use concentrated sulfuric acid as a dehydration catalyst, because this method has relatively large environmental pollution and serious corrosion to equipment. The traditional production method is to use methanol steam at 350-400°C and a pressure of 1.5MPa, and use aluminum p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J23/02B01J21/12C07C43/04C07C41/09
Inventor 李金来
Owner ENN XINNENG BEIJING TECH
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