Catalyst for producing methylal by selective oxidation of methanol and preparation method and use thereof

A selective oxidation and methylal technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, preparation of organic compounds, etc., can solve the problem of low methanol conversion rate and methylal selectivity Low cost, no practical value, etc., to achieve the effect of simple preparation method, reduced production cost and investment cost, and low cost

Inactive Publication Date: 2005-07-06
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When studying these reactions, methylal is considered as a by-product of the partial oxidation of methanol, especially when the temperature is low, the selectivity of methylal is high, up to 50%, but the corresponding methanol conversion rate is less than 30% (Tronconi E, Ind. Eng. Chem. Res., Vol. 26, 1987, p. 1369)
As the temperature rises, the conversion rate of methanol increases, but the selectivity of methylal drops sharply, while

Method used

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  • Catalyst for producing methylal by selective oxidation of methanol and preparation method and use thereof
  • Catalyst for producing methylal by selective oxidation of methanol and preparation method and use thereof
  • Catalyst for producing methylal by selective oxidation of methanol and preparation method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Mix 71.0g of ammonium metavanadate and 142.0g of oxalic acid, add 600.0ml of water, stir and dissolve to obtain a dark green solution, add 500.0g of powdered titanium dioxide to the above dark green solution and stir to form a light green paste, and place it for 2 hours Dry at 110°C for 12 hours, and then bake in air at 400°C for 6 hours to obtain 2 o 5 Yellow powdered vanadium-titanium catalyst A. A part of the prepared powdery vanadium-titanium catalyst A is pressed into a sheet, and then the sheet-shaped vanadium-titanium catalyst is smashed, sieved, and a particle size of 20-40 meshes is used for activity detection. Analyzing catalyst composition, V 2 o 5 Content 9.8%. This sample was designated as Catalyst #1 for comparison.

Embodiment 2

[0027] Mix 77.2g of ammonium metavanadate and 154.4g of oxalic acid, add 290.0ml of water, stir and dissolve to obtain a dark green solution, add 240.0g of powdered titanium dioxide to the above dark green solution and stir to form a light green paste, and leave it for 2 hours Dry at 110° C. for 12 hours, and then bake at 400° C. in air for 6 hours to obtain vanadium-titanium catalyst B in yellow powder form. A part of the prepared powdery vanadium-titanium catalyst B is pressed into a sheet, and then the sheet-shaped vanadium-titanium catalyst is smashed, sieved, and a particle size of 20-40 meshes is used for activity detection. Analyzing catalyst composition, V 2 o 5 Content 20.1%. This sample was designated #2 catalyst for comparison.

Embodiment 3

[0029] Put 6.2g of crystalline titanium sulfate into a 200ml crucible, add 150.0ml of distilled water and stir to dissolve it, weigh another 135.0g of titanium dioxide powder and add it to the above solution, stir for 10 minutes, let it stand for 5 hours and then dry it overnight at 110°C, then Calcined at 400°C for 5 hours to produce modified titanium dioxide.

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PUM

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Abstract

This invention relates to carbinol selection oxidation to process dimethoxym ethane catalyzer, which is loaded with vanadium on the modified titania with sulfur in acid environment, wherein the modified titania sulfur content is countered as the sulfate radical mass of 1.0-4.5 úÑ, and the vanadium load is countered as vanadic anhydride mass of 5-20 úÑ. The catalyzer in this invention has the conversion rate as 17.6-62.8 úÑ and the dimethoxym ethane selection rate as 67.8-97.9 úÑ.

Description

1. Technical field [0001] The invention relates to a catalyst for directly producing methylal by oxidation of methanol under mild conditions, a preparation method thereof and a method for preparing methylal with the catalyst. 2. Background technology [0002] Methylal, also known as dimethoxymethane, can be used as a solvent for the production of fragrances and synthetic drugs because of its very low toxicity, and can also be used as an intermediate for the production of polyoxymethylene, which is an important engineering plastic. It has a wide range of applications in the automobile industry. In addition, due to the potential application of methylal in the field of diesel additives, methylal has attracted more and more attention. [0003] At present, methylal is mainly produced by the dehydration of methanol and formaldehyde on an acidic catalyst. Commonly used acidic catalysts include inorganic acids, acidic molecular sieves, and macroporous cationic acidic resins. For exa...

Claims

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Application Information

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IPC IPC(8): B01J23/22B01J27/053C07C41/09C07C41/50
Inventor 沈俭一傅玉川洪涛刘学军
Owner NANJING UNIV
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