Preparation method of catalyst in preparation of dimethyl ether by methyl alcohol

A methanol preparation and catalyst technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of poor low temperature activity, low reaction temperature, high energy consumption, and achieve low equipment corrosion and catalytic activity. The effect of high and low reaction temperature

Inactive Publication Date: 2010-07-28
XIAN ORIGIN CHEM TECH
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Problems solved by technology

Invention patents CN1322704 and CN1111231A reported a method for preparing dimethyl ether using liquid acid as a catalyst. The reaction temperature of this method is low and the conversion rate is high. The treatment method is not matched, and the pollution of the environment is serious
The stronger the acidity of the catalyst, the faster the dehydration reaction speed, the lower the activation temperature, and the higher the conversion rate of methanol; but as the conversion rate increases, the selectivity of the target product dimethyl ether becomes worse, and more side reactions occur At this time, carbon deposits and coking occur on the surface of the catalyst, resulting in a rapid decline in the activity of the catalyst.
If the catalyst is weak in acidity and the catalyst activity temperature is low, the reaction temperature must be increased to increase the conversion rate of methanol. Although dimethyl ether has high selectivity, the energy consumption is high, which is n

Method used

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  • Preparation method of catalyst in preparation of dimethyl ether by methyl alcohol
  • Preparation method of catalyst in preparation of dimethyl ether by methyl alcohol

Examples

Experimental program
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Effect test

Example Embodiment

[0015] Example 1

[0016] Mix 280 grams of pseudo-boehmite powder, 210 grams of pseudo-boehmite powder roasted at 500°C, 23 grams of HZSM-5 molecular sieve, 7.5 grams of sesame powder and 7.5 grams of chemical paste, and then add 10 grams of citric acid and The self-made aluminum sol 50ml is uniformly mixed and rolled in a kneader to form a mass of material, and finally the mass of material is extruded into a strip of material in the extruder; the strip of material is dried at room temperature and then Dry in an oven for 8-12 hours, and finally roast in a muffle furnace. In an air atmosphere, roast at 150°C for 5 hours, 300°C for 2 hours, 400°C for 1 hour, 500°C for 5 hours, cool to room temperature, and cool to At room temperature, a catalyst for preparing dimethyl ether from methanol is obtained, and the sample number is CM-A.

Example Embodiment

[0017] Example 2

[0018] Mix 280 grams of pseudo-boehmite powder, 210 grams of pseudo-boehmite powder roasted at 400°C, 75 grams of HZSM-5 molecular sieve, 7.5 grams of sesame powder, and 7.5 grams of chemical paste, and then add 10 grams of citric acid and The self-made aluminum sol 50ml is uniformly mixed and rolled in a kneader to form a mass of material, and finally the mass of material is extruded into a strip of material in the extruder; the strip of material is dried at room temperature and then Dry in an oven for 8-12 hours, and finally calcine in a muffle furnace. In an air atmosphere, calcine at 200°C for 1.5 hours, 300°C for 1.5 hours, 400°C for 2 hours, 500°C for 4 hours, cool to room temperature, and cool to At room temperature, the catalyst for preparing dimethyl ether from methanol is obtained, and the sample number is CM-B.

Example Embodiment

[0019] Example 3

[0020] Mix 120 grams of pseudo-boehmite powder, 5 grams of HZSM-5 molecular sieve, 5 grams of titanium sulfate, and 3 grams of chemical paste, and mix them evenly in a kneader and roll them to form masses, and finally the masses Extrude the strip material in the extruder; dry the strip material at room temperature first, then dry it in an oven for 8-12 hours, and finally roast it in a muffle furnace, and roast it at 200°C for 2 hours in an air atmosphere. Calcined at 300°C for 2 hours, 400°C for 1.5 hours, 550°C for 1 hour, cooled to room temperature, and cooled to room temperature to obtain a catalyst for preparing dimethyl ether from methanol. The sample number is CM-C.

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Abstract

The invention discloses a preparation method of a catalyst in the preparation of dimethyl ether by methyl alcohol, the preparation process is that: eudo-boehmite powder is roasted to be active alumina powder at the temperature of 500 DEG C; then, the active alumina powder is mixed with catalysis additives such as HZSM-5 molecular sieve, titanic sulfate, heteropolyacid and the like; chemical paste, citric acid and a peptizing agent are added into the mixture for uniform mixing and rolling compaction, so as to form dough material; the dough material is extruded into bands and molded in a band extrusion machine; and after the drying and roasting, the catalyst in the preparation of dimethyl ether by methyl alcohol is obtained. The catalyst prepared in the invention not only has good activation, selectivity and stability, but also has appropriate acidity and environmentally friendly, has no corrosion to equipment and can be used in the industrial production for preparing the dimethyl ether.

Description

technical field [0001] The invention relates to a method for preparing a catalyst, in particular to a method for preparing a catalyst for preparing dimethyl ether from methanol. Background technique [0002] Dimethyl ether, also known as methyl ether, or DME for short. Dimethyl ether is a colorless, odorless, low-toxic, chemically stable, and water-soluble gas at room temperature. As an important chemical raw material, it is widely used as aerosol, refrigerant and various organic synthetic raw materials in the chemical and pharmaceutical industries. DME can be used in the synthesis of many fine chemicals, such as pharmaceuticals, fuels, pesticides, etc. Liquid DME has good solubility to polar and non-polar organic substances, so it is widely used in aerosol spray solvents, such as hairspray, mousse, air freshener, insecticide, spray paint, foaming agent, etc., and DME is also It can replace Freon as a low-toxic refrigerant, extractant and anesthetic. In recent years, wit...

Claims

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Application Information

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IPC IPC(8): B01J29/40B01J29/85B01J29/48B01J21/04C07C43/04C07C41/09
Inventor 高俊文潘蕊娟张勇宋庆锋王瑞杜彩霞
Owner XIAN ORIGIN CHEM TECH
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