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A kind of structured catalyst strengthens the method for producing dimethyl ether from methanol

A structuring catalyst, dimethyl ether technology, applied in physical/chemical process catalysts, catalyst carriers, molecular sieve catalysts, etc., can solve the problems of low alumina catalyst activity, low reaction space velocity, easy to fly temperature, etc., to prevent sudden Deactivation, high reaction space velocity, good heat transfer ability

Active Publication Date: 2015-12-23
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for strengthening methanol to produce dimethyl ether with a structured catalyst, which mainly solves the problem of low activity, easy carbon deposition, easy overheating, and reaction problems of the alumina catalyst used in the production of methanol to dimethyl ether in the prior art. low airspeed problem

Method used

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  • A kind of structured catalyst strengthens the method for producing dimethyl ether from methanol
  • A kind of structured catalyst strengthens the method for producing dimethyl ether from methanol
  • A kind of structured catalyst strengthens the method for producing dimethyl ether from methanol

Examples

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Embodiment 1

[0033] The catalyst is a Mg-modified ZSM-5 molecular sieve / foam SiC structured catalyst, and the volume of the catalyst is 50ml. The specific process of Mg-modified ZSM-5 molecular sieve refers to: ZSM-5 / foamed SiC structured catalyst is impregnated in magnesium nitrate aqueous solution (concentration: 1wt%) for 30 minutes, then roasted at 500°C for 6 hours, Mg-modified ZSM The mass fraction of Mg in the -5 molecular sieve coating is 0.1%. In the Mg-modified ZSM-5 molecular sieve / foam SiC structured catalyst, the loading of Mg-modified ZSM-5 molecular sieve is 10wt%. The pore diameter of the foamed SiC carrier is 1mm, and the porosity is 60%. The specific surface area of ​​the structured catalyst is 46.53m 2 g -1 .

[0034] The reaction of methanol to dimethyl ether is carried out in a fixed bed reactor. The reaction conditions are as follows: the reaction temperature is 230°C, the reaction pressure is 2.5MPa, the reaction raw material is methanol, and the feed mass space...

Embodiment 2

[0037] The catalyst is a nitrogen-doped SAPO-11 molecular sieve / ZSM-5 molecular sieve / foam SiC structured catalyst, and the volume of the catalyst is 50ml. The specific process of nitrogen-doped SAPO-11 molecular sieve / ZSM-5 molecular sieve refers to: SAPO-11 molecular sieve / ZSM-5 molecular sieve / foam SiC structured In the ZSM-5 molecular sieve coating, the mass fraction of SAPO-11 molecular sieve is 60%, the mass fraction of ZSM-5 molecular sieve is 39.95%, and the mass fraction of nitrogen element is 0.05%. In the nitrogen-doped SAPO-11 molecular sieve / ZSM-5 molecular sieve / foam SiC structured catalyst, the loading amount of nitrogen-doped SAPO-11 molecular sieve / ZSM-5 molecular sieve is 50wt%. The pore size of the foamed SiC carrier is 0.5mm, and the porosity is 70%. The specific surface area of ​​the structured catalyst is 136.35m 2 g -1 .

[0038] In this example, the preparation method of SAPO-11 molecular sieve / ZSM-5 molecular sieve / foamed SiC structured catalyst is...

Embodiment 3

[0043] The catalyst adopts lanthanum-modified SAPO-11 molecular sieve / SAPO-34 molecular sieve / γ-alumina / foam SiC structured catalyst, and the catalyst volume is 50ml. The specific process of lanthanum modified SAPO-11 molecular sieve / SAPO-34 molecular sieve / γ-alumina refers to: SAPO-11 molecular sieve / SAPO-34 / γ-alumina foam / SiC structured catalyst in aqueous solution of lanthanum nitrate (concentration is 2wt% ) for 60 minutes, then roasted at 500°C for 6 hours, in the lanthanum-modified SAPO-11 molecular sieve / SAPO-34 molecular sieve / γ-alumina coating, the mass fraction of SAPO-11 molecular sieve is 30%, SAPO-34 The mass fraction of molecular sieve is 40%, the mass fraction of γ-alumina is 29.7%, and the mass fraction of lanthanum is 0.3%. In the lanthanum-modified SAPO-11 molecular sieve / SAPO-34 molecular sieve / γ-alumina / foam SiC structured catalyst, the loading capacity of lanthanum-modified SAPO-11 molecular sieve / SAPO-34 molecular sieve / γ-alumina is 25wt%. The pore size ...

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Abstract

The invention relates to a structured catalyst-enhanced method for producing dimethyl ether from methanol. It mainly solves the problem that the alumina catalyst used in the prior art for producing dimethyl ether from methanol has low activity, is prone to carbon deposition, is prone to temperature rise, and has low reaction space speed. The problem. The main steps of the method are: obtaining the target product from methanol dehydration reaction in a fixed bed reactor in the presence of a structured catalyst. The structured catalyst uses foam-structured silicon carbide as a carrier; a modified molecular sieve coating is loaded thereon; or an activated alumina coating, or a modified activated alumina coating is loaded thereon. The advantage of using a structured catalyst in this invention is that it utilizes the characteristics of foamed silicon carbide-based structured catalyst to enhance heat transfer and mass transfer, prevent the generation of hot spots in the catalyst bed, improve the catalyst's ability to resist carbon deposition, and achieve high target product selectivity. And the reaction of methanol to dimethyl ether can be carried out at a larger space speed.

Description

technical field [0001] The invention relates to a method for preparing dimethyl ether by strengthening methanol with a structured catalyst. More specifically, it takes foamed silicon carbide as a carrier, loads an active coating on it, and uses methanol as a raw material in a fixed-bed reactor. The method of taking dimethyl ether. Background technique [0002] Dimethyl ether (DME) is a colorless, non-toxic, environmentally friendly compound that has many uses in pharmaceutical, pesticide, fuel and other industries. In particular, the application of DME in the substitution of civil fuel and vehicle fuel has been implemented and popularized, resulting in a huge market demand for DME, thus stimulating the vigorous development of DME production. [0003] The dehydration of methanol to dimethyl ether adopts solid acid catalyst, and the most commonly used solid acid catalyst is activated alumina, followed by silica-alumina molecular sieve. The advantage of the activated alumina ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C43/04C07C41/09B01J32/00B01J35/10B01J29/40B01J29/85B01J29/70B01J29/76B01J29/84
CPCC07C41/09B01J23/755B01J27/224B01J29/0308B01J29/40B01J29/48B01J29/84B01J29/85B01J2229/20B01J35/657C07C43/043
Inventor 张劲松矫义来杨振明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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