Modified alumina catalyst for synthetizing dimethyl ether

A catalyst and alumina technology, applied in physical/chemical process catalysts, dehydration of hydroxyl-containing compounds to prepare ether, ether preparation, etc., can solve the problems of changing the acidity of alumina, unsuitable, strong acidity, etc.

Inactive Publication Date: 2005-05-11
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] On the other hand, it has been reported in the literature that dilute H 2 SO 4 Impregnated TiO 2 , ZrO 2 to prepare superacids (Journal of Catalysis, volume 168, pages 482-490), but there is no report in the liter

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1: take by weighing Ti(SO 4 ) 2 50.0g, add 3000ml distilled water, stir to dissolve, and weigh another commercially available powdered γ-Al 2 o 3 (A: specific surface area 290m 2 / g)950.0g, pour the above Ti(SO 4 ) 2 solution, stir to form a paste. Place it at room temperature for 5 hours, then dry it at 110°C for 12 hours, and finally bake it at 450°C for 1.5 hours to make Ti(SO 4 ) 2 Modified γ-Al 2 o 3 . The resulting modified γ-Al 2 o 3 Contains SO 4 2- 4wt%, pressed into tablets, crushed and sieved to 20-40 mesh, used for the determination of the reaction performance of methanol dehydration to dimethyl ether. Measuring method: Weigh 0.5g of the catalyst sample of the present invention, put it into a glass reaction tube, heat it to 260°C, preheat the methanol to 260°C after gasification, and import it into the reactor, analyze the concentration of methanol at the inlet of the reactor and the composition of the gas at the outlet, and calculat...

Embodiment 2

[0013] Embodiment 2: take by weighing (NH 4 ) 2 SO 4 27.1g, add 2000ml distilled water, stir to dissolve, and weigh powdered γ-Al 2 o 3 (A: specific surface area 290m 2 / g) 490.0g, pour into the above (NH 4 ) 2 SO 4 solution, stir to form a paste. Place it at room temperature for 5 hours, then dry it at 110°C for 12 hours, and finally bake it at 450°C for 1.5 hours (NH 4 ) 2 SO 4 Modified γ-Al 2 o 3 . The resulting modified γ-Al 2 o 3 Contains SO 4 2- 4wt%, pressed into tablets, smashed, and sieved to 20-40 mesh, used for the determination of the reaction performance of methanol dehydration to dimethyl ether, the determination method is the same as that of Example 1. Measurement results: methanol conversion rate is 90.7%, dimethyl ether selectivity is 100%.

Embodiment 3

[0014] Embodiment 3: take by weighing Ti(SO 4 ) 2 12.5g, add 3000ml distilled water, stir to dissolve, and weigh powdered γ-Al 2 o 3 (A: specific surface area 290m 2 / g)990.0g, pour the above Ti(SO 4 ) 2 solution, stir to form a paste. Place it at room temperature for 5 hours, then dry it at 110°C for 12 hours, and finally bake it at 450°C for 1.5 hours to make Ti(SO 4 ) 2 Modified γ-Al 2 o 3 . The resulting modified γ-Al 2 o 3 Contains SO 4 2- 1wt%, pressed into tablets, crushed, and sieved to 20-40 meshes, used for the determination of the reaction performance of methanol dehydration to dimethyl ether, and the determination method is the same as that of Example 1. Measurement results: methanol conversion rate is 79.6%, dimethyl ether selectivity is 100%.

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PUM

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Abstract

A modified alumina catalyst for preparing dimethylether by dewatering methanol is prepard by adding sulfate to ordinary gamma-Al2O3. Its advantages are high transform rate and selectivity at lower temp and no carbon deposit at higher temp.

Description

1. Technical field [0001] The invention relates to a modified alumina catalyst for synthesizing dimethyl ether by dehydrating methanol, and belongs to the technical field of catalysts. 2. Background technology [0002] Dimethyl ether is the simplest ether, which can be used as propellant, civil fuel and diesel engine fuel, etc. It is also an important intermediate for producing liquid fuel from natural gas and coal, and is a potential clean energy carrier. [0003] DME can be produced by the dehydration of methanol over an acidic catalyst. Sulfuric acid was first used and has now been replaced by solid acid. The solid acidic catalyst used is modified γ-Al 2 o 3 , acidic molecular sieve, aluminum phosphate, etc., such as US Patent No. 4,595,785, which proposes γ-Al modified with aluminum titanate 2 o 3 As a dehydration catalyst to synthesize dimethyl ether, it can increase the reaction speed and reduce side reactions and coking at the same time, but the reaction temperatu...

Claims

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Application Information

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IPC IPC(8): B01J21/04B01J27/053C07C41/09
Inventor 沈俭一傅玉川
Owner NANJING UNIV
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