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Process for producing catalyst for methacrylic acid production

A technology of methacrylic acid and methacrolein, which is used in catalyst activation/preparation, preparation of organic compounds, chemical instruments and methods, etc., can solve the problem of difficult to obtain high mechanical strength catalysts, difficult to obtain high activity catalysts, and coating peeling. And other issues

Inactive Publication Date: 2006-06-28
NIPPON KAYAKU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] On the other hand, the disadvantages of preparing coated catalysts include: [1] peeling of the coating due to catalyst chipping and difficulty in obtaining a catalyst with high mechanical strength, [2] difficulty in coating the support with a large amount of active catalytic material and [3] Difficult to obtain highly active catalysts due to the inclusion of inert species
[0008] The methods to overcome these disadvantages are related to the nature of the active catalytic species, the current situation is that only the individual catalysts can be studied since there is no general method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] 1) Preparation of catalyst

[0092] Add 300g of aluminum oxide, 13.62g of vanadium pentoxide and 27.62g of 85% by mass orthophosphoric acid into 2100mL of pure water, heat and reflux the solution at 90-100° C. for 5 hours to obtain a umber-colored transparent solution. Subsequently, 12.15 g of antimony trioxide was added to the solution, and the resulting solution was heated to reflux at 90-100° C. for 2 hours to obtain a dark blue solution in which antimony trioxide was dissolved. Then, the solution was cooled to 15-20°C. Under stirring, a solution of 20.00g of cesium acetate dissolved in 150ml of pure water and a solution of 24.09g of ammonium acetate dissolved in 150ml of pure water were gradually added to the solution, and aged at 15-20°C for 1 hour to obtain a blue-green slurry. The slurry contains heteropolyacid precursor cesium salt and ammonium salt.

[0093] Then, a solution of 16.64 g of copper acetate monohydrate in 240 ml of pure water was added to the slu...

Embodiment 2

[0119] 1) Preparation of catalyst

[0120] Add 300g of molybdenum trioxide, 13.26g of vanadium pentoxide and 27.62g of 85% by mass orthophosphoric acid in 2100mL of pure water, heat and reflux the solution at 90-100°C for 5 hours to produce a brown transparent solution. Subsequently, 12.15 g of antimony trioxide was added to the solution, and the resulting solution was heated to reflux at 90-100° C. for 2 hours to obtain a dark blue solution in which antimony trioxide was dissolved. Then, the solution was cooled to 15-20° C., and then a solution of 20.00 g of cesium acetate dissolved in 150 ml of pure water and a solution of 24.09 g of ammonium acetate dissolved in 150 ml of pure water were gradually added to the solution simultaneously. The resulting solution was aged at 15-20° C. for 1 hour to obtain a blue-green slurry containing heteropolyacid precursor cesium salt and ammonium salt.

[0121] Afterwards, the slurry was evaporated to dryness with hot water. Thereafter, it...

Embodiment 3

[0146] 1) Preparation of catalyst

[0147] Add 300 g of molybdenum trioxide, 15.16 g of vanadium pentoxide and 27.62 g of 85% by mass orthophosphoric acid in 2100 mL of pure water, and heat and reflux the solution at 90-100° C. for 5 hours to obtain a tan-colored transparent solution. Then, the solution was cooled to 15-20° C., and then a solution of 17.49 g of cesium hydroxide monohydrate dissolved in 100 ml of pure water and 20.88 g of ammonium acetate dissolved in 100 ml of pure water were gradually added to the solution while stirring. The solution. The formed solution was aged at 15-20° C. for 15 minutes to obtain a light yellow-white slurry containing heteropolyacid precursor cesium salt and ammonium salt.

[0148] Then, a solution of 16.64 g of copper acetate monohydrate dissolved in 200 ml of pure water was added to the slurry, and aged at 15-20° C. for 1 hour.

[0149] Next, the slurry was evaporated to dryness with hot water, then ground with a mortar, classified t...

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Abstract

The object of the present invention is to provide a method for preparing a catalyst for preparing methacrylic acid by gas-phase catalytic oxidation of methacrolein, isobutyraldehyde or isobutyric acid with high yield and high selectivity. The method comprises: (a) mixing compounds each containing any one of Mo, V, P, Cu, Cs or NH4 with water to prepare aqueous solutions or dispersions of these compounds (hereinafter, these two are referred to as slurries; ); (b) drying the slurry formed in step (a) to obtain a dry slurry; (c) calcining the dry slurry obtained in step (b) to obtain a calcined body; (d) filtering through mixing A step of separating the obtained mixture of the calcined body obtained in step (c) and water into an aqueous solution and a water-insoluble substance; (e) drying the water-insoluble substance obtained in step (d) to obtain a dry insoluble substance Water substance steps.

Description

technical field [0001] The present invention relates to a method for preparing a catalyst for producing methacrylic acid through gas-phase catalytic oxidation of methacrolein, isobutyraldehyde or isobutyric acid. The catalyst has long service life, high activity and high selectivity. Background technique [0002] Many catalysts have been proposed for producing methacrylic acid by gas-phase catalytic oxidation of methacrolein, isobutyraldehyde or isobutyric acid. Most of these catalysts are mainly composed of molybdenum and phosphorus, and have the structure of heteropolyacids and / or salts thereof. However, compared with molybdenum-vanadium-based catalysts used in the gas-phase catalytic oxidation of acrolein to produce acrylic acid, the catalysts used in this reaction have low reactivity, low selectivity to desired substances, and short lifetime. The reaction of acrolein to acrylic acid is known to be similar to the gas-phase catalytic oxidation of methacrolein, isobutyrald...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J23/00B01J27/199B01J37/02B01J37/06B01J37/08B01J37/16C07C51/235C07C51/25C07C51/377C07C57/05C07C57/055
CPCB01J23/002B01J27/199B01J37/0219B01J37/0236B01J2523/00C07C51/235C07C51/252C07C51/377C07C57/04B01J2523/15B01J2523/50B01J2523/51B01J2523/53B01J2523/55B01J2523/68B01J2523/17B01J27/24B01J37/06B01J37/08
Inventor 须藤渥濑尾纯将仓上龙彦
Owner NIPPON KAYAKU CO LTD
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