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Catalyst for producing dimethyl ether by methanol liquid-phase or mixed-phase dewatering method

A catalyst, liquid phase technology, applied in the field of catalysts for the production of dimethyl ether, can solve problems such as unfavorable catalyst stability, equipment corrosion, environmental pollution and the like

Active Publication Date: 2007-01-17
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In the above inventions, the use of liquid acids such as sulfuric acid as catalysts will cause equipment corrosion and environmental pollution problems, and it is difficult to obtain high-purity dimethyl ether products by directly synthesizing dimethyl ether from synthesis gas
Using a modified alumina catalyst to produce dimethyl ether from methanol gas phase dehydration can obtain dimethyl ether with high purity, but the reaction temperature is relatively high, generally 200-380 ° C, which is easy to generate hydrocarbon by-products, which is not good for the stability of the catalyst.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Beta zeolite raw powder (SiO 2 / Al 2 o 3 30) and SB powder (a kind of pseudo-boehmite imported from Germany) are mixed evenly with an appropriate amount of kale powder in a ratio of 70:30 (dry basis weight), added an appropriate amount of nitric acid and deionized water, extruded into strips, and prepared into strips with a diameter of 1.6 mm, dried at 120°C for 2 hours, calcined in a muffle furnace at 540°C for 3 hours, and then treated with 0.8M NH 4 NO 3 The aqueous solution was exchanged three times at 85°C, washed three times with deionized water, dried at 120°C for 4 hours, calcined at 530°C for 2 hours, and broken into 2-3 mm long particles.

[0023] 26 milliliters of the above-mentioned catalysts were loaded into a bottom-feeding fixed-bed reactor with an inner diameter of 15 mm, and after activation for 1 hour at 250° C. in a nitrogen stream, the reaction of methanol dehydration to dimethyl ether was carried out.

[0024] Under the conditions of reaction te...

Embodiment 2

[0026] The ZSM-5 zeolite raw powder (SiO 2 / Al 2 o 3 38) and SB powder (a kind of pseudo-boehmite imported from Germany) are uniformly mixed with an appropriate amount of kale powder in a ratio of 80:20 (dry basis weight), added an appropriate amount of nitric acid and deionized water, and extruded into strips to produce into strips with a diameter of 1.6 mm, dried at 120°C for 2 hours, calcined in a muffle furnace at 540°C for 3 hours, and then treated with 0.8M NH 4 NO 3 The aqueous solution was exchanged 3 times at 90°C, washed 3 times with deionized water, dried at 120°C for 4 hours, calcined at 550°C for 3 hours, and broken into 2-3 mm long particles.

[0027] 24 milliliters of the above-mentioned catalysts were loaded into a bottom-feeding fixed-bed reactor with an inner diameter of 15 mm, activated in nitrogen flow at 250° C. for 1 hour, and the reaction of methanol dehydration to dimethyl ether was carried out.

[0028] Under the conditions of a reaction temperatur...

Embodiment 3

[0030] The ZSM-5 zeolite raw powder (SiO 2 / Al 2 o 3 38) and SB powder (a kind of pseudo-boehmite imported from Germany) are uniformly mixed with an appropriate amount of kale powder in a ratio of 80:20 (dry basis weight), added an appropriate amount of nitric acid and deionized water, and extruded into strips to produce into strips with a diameter of 1.6 mm, dried at 120°C for 2 hours, calcined in a muffle furnace at 540°C for 3 hours, and then treated with 0.8M NH 4 NO 3 The aqueous solution was exchanged three times at 90°C, washed three times with deionized water, dried at 120°C for 4 hours, calcined at 550°C for 3 hours, and steamed at 500°C for 2 hours to break into 2-3 mm long particles.

[0031] 18 milliliters of the above-mentioned catalysts were loaded into a bottom-feeding fixed-bed reactor with an inner diameter of 15 mm, activated in a nitrogen flow at 250° C. for 1 hour, and then the reaction of methanol dehydration to dimethyl ether was carried out.

[0032]...

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PUM

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Abstract

A catalyst for preparing dimethylether from the liquid phase or gas-liquid mixture of methanol by dewatering is composed of adhesive (5-50 Wt%) and the molecular sieve (50-95 Wt%) chosen from ZSM-5, ZSM-11, Y, mordenite, beta-zeolite, MCM-22, MCM-41, MCM-56, MCM 49, SAPO-5 and SAPO-34 molecular sieves, especially the MCM-22 one.

Description

technical field [0001] The invention relates to a catalyst for producing dimethyl ether, in particular to a catalyst for producing dimethyl ether by liquid-phase or mixed-phase dehydration of methanol. [0002] The invention also relates to the application of the above-mentioned catalyst to generate dimethyl ether with high selectivity through dehydration reaction in methanol liquid phase or gas-liquid mixed state. Background technique [0003] Chinese patent CN 1036199A discloses a method for producing dimethyl ether from methanol. Methanol vapor is dehydrated on a γ-alumina catalyst containing a small amount of silicon dioxide, and the dehydrated product is sent to a rectification tower for rectification. Pure dimethyl ether Ether and impurities are withdrawn as side products on certain trays of the tower. [0004] Chinese patent CN 1125216 discloses a method for producing dimethyl ether from methanol. After methanol with a content of 72-99.9% is removed from high boilers...

Claims

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Application Information

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IPC IPC(8): B01J29/00C07C41/09C07C43/04
CPCB01J29/7007B01J29/40B01J2229/42B01J2229/36C07C41/09B01J29/70B01J29/06
Inventor 刘中民孙新德许磊孟霜鹤朱书魁吕志辉
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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