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Method for activating catalyst for chlorine production

a catalyst and chlorine technology, applied in the field of activating catalysts for chlorine production, can solve the problems that the activity of catalysts with decreased activity cannot be recovered sufficiently, and achieve the effect of cost-effective production

Inactive Publication Date: 2010-07-22
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0004]An object of the present invention is to provide a method which can effectively recover the activity of a catalyst having decreased activity.
[0007]According to the activation method of the present invention, the activity of a catalyst having decreased activity can be recovered, and chlorine can be produced cost-effectively by reusing the catalyst activated by the present method.

Problems solved by technology

However, the activity of the catalyst having decreased activity could not have necessarily been recovered sufficiently by the method described in the above document.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

reference example 1

(a) Preparation of Fresh Catalyst

[0028]50 Parts by weight of titanium oxide [STR-60R manufactured by Sakai Chemical Industry Co., Ltd., 100% rutile type], 100 parts by weight of α-alumina [AES-12 manufactured by Sumitomo Chemical Co., Ltd.], 13.2 parts by weight of a titania sole [CSB manufactured by Sakai Chemical Industry Co., Ltd., titania content: 38% by weight] and 2 parts by weight of methyl cellulose [Metolose 65SH-4000 manufactured by Shin-Etsu Chemical Co., Ltd.] were mixed and pure water was added, followed by kneading. The resultant mixture was extruded into a cylindrical body having a diameter of 3.0 mmφ, dried and then ground into pieces each having a length of 4 to 6 mm. The resultant shaped body was calcined in air at 800° C. for 3 hours to obtain a carrier including a mixture of titanium oxide and α-alumina. The carrier was impregnated with an aqueous solution of ruthenium chloride, dried and then calcined in air at 250° C. for 2 hours to obtain a bluish gray support...

example 1

(a) Activation Treatment of Deteriorated Catalyst

[0030](Contact Treatment with Reducing Gas)

[0031]A nickel reaction tube having an inner diameter of 13 mm was filled with 1 g of the deteriorated catalyst of Reference Example 1(b) and then filled with 12 g of α-alumina spheres [SSA995 manufactured by NIKKATO CORPORATION] as a preheating layer at the gas inlet side of a catalyst layer. While feeding nitrogen gas at a rate of 80 ml / min, the reaction tube was immersed in a salt bath using a molten salt [potassium nitrate / sodium nitrite=1 / 1 (weight ratio)] as a heat medium, thereby adjusting the temperature of the catalyst layer to 350° C. Next, feed of the nitrogen gas was stopped, and carbon monoxide gas was fed at a rate of 3.2 ml / min (0.009 mol / h) and nitrogen gas was fed at a rate of 28.8 ml / min (0.08 mol / h) for 2 hours.

(b) Evaluation of Activated Catalyst

[0032]After the activation treatment (a), feed of the carbon monoxide gas was stopped and nitrogen gas was fed at a rate of 80 ml...

example 2

(a) Activation Treatment of Deteriorated Catalyst

[0033](Contact Treatment with Reducing Gas)

[0034]A nickel reaction tube having an inner diameter of 13 mm was filled with 1 g of the deteriorated catalyst of Reference Example 1(b) and then filled with 12 g of α-alumina spheres [SSA995 manufactured by NIKKATO CORPORATION] as a preheating layer at the gas inlet side of a catalyst layer. While feeding nitrogen gas at a rate of 80 ml / min, the reaction tube was immersed in a salt bath using a molten salt [potassium nitrate / sodium nitrite=1 / 1 (weight ratio)] as a heat medium, thereby adjusting the temperature of the catalyst layer to 350° C. Next, feed of the nitrogen gas was stopped, and carbon monoxide gas was fed at a rate of 3.2 ml / min (0.009 mol / h) and nitrogen gas was fed at a rate of 28.8 ml / min (0.08 mol / h) for 2 hours.

(Contact Treatment with Oxidizing Gas)

[0035]After the contact treatment with the reducing gas, feed of the carbon monoxide gas was stopped, and oxygen was fed at a r...

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Abstract

A catalyst having decreased activity is subjected to a contact treatment with a reducing gas containing carbon monoxide and / or hydrogen. Also, the catalyst can be effectively activated by being treated by contacting with an oxidizing gas after having been treated by contacting with the reducing gas. As the catalyst for production of chlorine, a ruthenium catalyst, particularly a catalyst containing ruthenium oxide is suitably activated.

Description

TECHNICAL FIELD[0001]The present invention relates to a method for activating a catalyst for use in the production process of chlorine, which production process comprises oxidizing hydrogen chloride with oxygen. The present invention also relates to a method for producing chlorine by oxidizing hydrogen chloride with oxygen using the catalyst activated by the method.BACKGROUND ART[0002]With respect to a method for activating a catalyst for producing chlorine by oxidizing hydrogen chloride with oxygen, Japanese Unexamined Patent Publication No. 2007-7521 discloses a method for activating a catalyst having decreased activity by bringing the catalyst into contact with a gas substantially composed only of oxygen and / or an inert gas.DISCLOSURE OF THE INVENTION[0003]However, the activity of the catalyst having decreased activity could not have necessarily been recovered sufficiently by the method described in the above document.[0004]An object of the present invention is to provide a metho...

Claims

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Application Information

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IPC IPC(8): C01B7/04B01J35/00B01J23/46
CPCB01J21/04B01J21/06B01J21/063B01J23/462B01J23/96B01J37/0009B01J37/0201B01J38/04B01J38/10B01J38/12C01B7/04Y02P20/584
Inventor UCHIDA, YOUHEISEKI, KOHEI
Owner SUMITOMO CHEM CO LTD
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