Method for producing regeneration catalyst for working solution usable for hydrogen peroxide production

A technology for regenerating catalysts and manufacturing methods, which is applied in the direction of metal/metal oxide/metal hydroxide catalysts, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve the problems of hydrogen peroxide production efficiency reduction, and achieve the best results Remarkable, the effect of preventing deterioration

Active Publication Date: 2009-01-14
MITSUBISHI GAS CHEM CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When this reduction and oxidation are repeated, by-products such as alkoxy anthraquinone and alkyl tetrahydroanthraquinone epoxide accumulate in the working solution, and the production efficiency of hydrogen peroxide decreases.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Add 200 g of γ-alumina [Sumitomo Chemical Co., Ltd., trade name: KHD-12] to 500 ml of a saturated solution of magnesium chloride hexahydrate [manufactured by Wako Pure Chemical Industries, Ltd.], and then keep the liquid temperature at approximately At 30°C, add ammonia solution while stirring, adjust the pH to 9-13, and fix magnesia so that the ratio of magnesia to the γ-alumina loaded with magnesium after firing is about 5% by weight. At this time, the treatment time with the magnesium-containing aqueous solution was 30 hours, and the treatment time with the ammonia solution was 40 hours. It was fired at 600° C. for 24 hours in a box-type firing furnace. Composition analysis (semi-quantitative value) of this catalyst by fluorescent X-ray analysis [RIX-3100 manufactured by RIGAKU Co., Ltd.] showed that the magnesium oxide relative to the magnesium-supported alumina after firing was 4.6% by weight ( Converted to magnesium (2.8% by weight), the chlorine component was 1....

Embodiment 2

[0045] A regenerated catalyst was prepared by the same method as in Example 1. Here, it is fixed so that the ratio of magnesia to the magnesium-loaded γ-alumina after firing becomes about 10% by weight. It was fired at 600° C. for 28 hours in a box-type firing furnace. Composition analysis (semi-quantitative value) by fluorescent X-ray analysis was performed on this catalyst. As a result, magnesium oxide was 9.5% by weight (5.7% by weight in terms of magnesium) relative to magnesium-supported alumina after firing, chlorine The composition is 0.8% by weight.

[0046] The prepared alumina catalyst was evaluated by the same cycle reactor as in Example 1 provided with a fixed bed reactor. On the 15th day when the circulation reaction was started, the pentyloxyanthraquinone in the working solution flowing out from the fixed-bed reactor was reduced by 20mmol / L compared with the working solution of the tank before the hydrogenation reactor, and the same amyltetrahydroanthraquinone ...

Embodiment 3

[0049] A regenerated catalyst was prepared by the same method as in Example 1. Here, it is fixed so that the ratio of magnesia to the magnesium-loaded γ-alumina after firing becomes about 20% by weight. It was fired at 600°C for 48 hours in a box-type firing furnace. Composition analysis (semi-quantitative value) by fluorescent X-ray analysis was performed on this catalyst. As a result, magnesium oxide was 18.2% by weight (11.0% by weight in terms of magnesium) relative to magnesium-supported alumina after firing, chlorine The composition is 1.5% by weight.

[0050] The prepared alumina catalyst was evaluated by the same cycle reactor as in Example 1 provided with a fixed bed reactor. On the 15th day when the circulation reaction was started, the pentyloxyanthraquinone in the working solution flowing out from the fixed-bed reactor was reduced by 21mmol / L compared with the working solution of the tank before the hydrogenation reactor, and the same amyltetrahydroanthraquinone ...

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Abstract

The present invention is directed to a method for producing a regeneration catalyst for a working solution usable for producing hydrogen peroxide by an anthraquinone method, wherein active alumina is treated with a 20% by weight to saturated aqueous solution of a magnesium salt, treated with ammonia and then burned.

Description

technical field [0001] The present invention relates to a method for producing a catalyst for regenerating a working solution used in the production of hydrogen peroxide by an anthraquinone method, and to a regenerated catalyst obtained by the production method. Background technique [0002] Hydrogen peroxide is obtained by dissolving alkyl anthraquinones with alkyl substituents (hereinafter referred to as alkyl anthraquinones) and alkyl tetrahydroanthraquinones with alkyl substituents (hereinafter referred to as alkyl anthraquinones) in a suitable organic solvent. Working solutions such as tetrahydroanthraquinone) are repeatedly reduced and oxidized to be industrially produced. When this reduction and oxidation are repeated, by-products such as alkoxyanthrone and alkyltetrahydroanthraquinone epoxide accumulate in the working solution, and the production efficiency of hydrogen peroxide decreases. [0003] As a method for regenerating and converting these by-products into an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/138C01B15/023
CPCB01J21/10B01J21/04B01J23/002B01J23/02B01J23/58B01J37/0201B01J37/0205B01J37/06B01J2523/00C01B15/023Y02P20/584B01J2523/22B01J2523/31B01J38/66B01J23/40
Inventor 长谷川浩井浦克弘萩原猪佐夫
Owner MITSUBISHI GAS CHEM CO INC
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