Solid catalyst for synthesizing dimethyl ether by gas-phase method, its preparation and reactive process

A gas-phase synthesis and composite catalyst technology, which is applied in chemical instruments and methods, ether preparation, molecular sieve catalysts, etc., can solve problems such as high temperature, catalyst exothermic overheating, and difficult control of reaction temperature, and achieves simple control and high preparation method The effect of simplicity and ease of industrial implementation

Inactive Publication Date: 2007-01-17
NANKAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the previous work, we prepared ZSM-5 molecular sieve catalyst for the vapor phase synthesis of dimethyl ether from methanol, and achieved good results. The temperature in the reactor is too high, and the t...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] catalyst preparation

[0024] Weigh 100g of ZSM-5 molecular sieve catalyst powder and 100g of deionized water, beat for 30min under high-speed mechanical stirring, and then add 60g of ZrOCl at a speed of 2ml / min (peristaltic pump can be used) 2 ·8H 2 O aqueous solution, the concentration of the aqueous solution is about 5 ml H 2 O / 1.0g ZrOCl 2 ·8H 2 O). After continuing to stir for 10min, slowly add (0.5ml / min, peristaltic pump) ammonia water with a concentration of 12.5% ​​(generally commercial ammonia water is 25%, and it can be diluted twice) until the liquid mixing system solidifies instantly. The Cl in the obtained solid was washed with deionized water - (with 0.2N AgNO 3 The solution is checked for the filtered liquid, and there is no white precipitation observed with the naked eye), and then immersed with absolute ethanol for three times. After drying to a suitable level at room temperature, extruded strips are formed. After the strip-shaped solid was nat...

Embodiment 2

[0028] Weigh 100 grams of ZSM-5 molecular sieve catalyst powder, and mechanically mix it with 100 grams of MCM-41 molecular sieve powder at room temperature, and add 20 grams of pseudoboehmite as a binder. Others are the same as Example 1, and the results are shown in Table 1.

[0029] Preparation method of MCM-41: using metakaolin as raw material and surfactant cetyl trimethyl ammonium bromide as template agent, after hydrothermal reaction, after crystallization at 120 ° C for 48 hours, drying at 550 ° C A1-MCM-41 molecular sieve was synthesized after calcination.

[0030] The specific steps are: mixing metakaolin, silica gel, alkali and water into a gel, H 2 Mix O and the surfactant evenly, then mix the mixed gel with the surfactant solution, stir evenly, age at room temperature for 1.5-3 hours, and then place it in a stainless steel reactor for hydrothermal reaction. After the reaction is completed, suction filtration, washing , 120 ℃ drying.

Embodiment 3

[0032] 100 grams of ZSM-5 molecular sieve catalyst powder was weighed and directly compressed into tablets. Others are the same as Example 1, and the results are shown in Table 1.

[0033] Example

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PUM

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Abstract

A solid catalyst for the gas-phase synthesis of dimethylether is composed of ZSM-5 molecular sieve (50-90 Wt%) and zirconium oxide or MCM-41 molecular sieve (10-50 Wt%). Its preparing process and reaction technology are also disclosed.

Description

technical field [0001] The invention relates to a solid catalyst for gas-phase synthesis of dimethyl ether, a preparation method and a reaction process. Background technique [0002] Dimethyl ether, referred to as DME, is the simplest aliphatic ether and an important organic chemical raw material. It is widely used in pharmaceuticals, fuels, pesticides, daily chemicals and other industries. [0003] For a long period of time, dimethyl ether was obtained by rectification as a by-product of high-pressure synthesis of methyl ether. With the rise of low-pressure synthesis of methyl ether, foreign high-pressure methyl ether units were almost replaced by low-pressure methods. The technology of catalytic dehydration of methanol and synthesis of dimethyl ether from synthesis gas. [0004] As the Chinese government attaches great importance to environmental protection, the domestic production of dimethyl ether has started in recent years. Recently, some domestic research institutes...

Claims

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Application Information

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IPC IPC(8): B01J29/40B01J29/70C07C43/04C07C41/09
Inventor 李伟付斌王全义边俊民张明慧陶克毅
Owner NANKAI UNIV
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