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Preparation method of catalyst used for chlorine preparation, catalyst, and method used for preparing chlorine

一种催化剂、氯气的技术，应用在催化剂活化/制备、非均相催化剂化学元素、化学仪器和方法等方向，能够解决催化剂活性组分挥发流失、易飞温、床层飞温等问题，达到良好流动性和活性、良好抗粘结性、小磨损指数的效果

Active Publication Date: 2015-07-22
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of this method is: the reaction temperature is difficult to control in the fixed-bed reactor, and it is easy to overheat, which will cause the volatilization and loss of the active components of the catalyst, affect the service life of the catalyst and the quality of chlorine gas, and due to the medium in the reaction process, including Hydrogen chloride, chlorine, oxygen, water, etc. are highly corrosive under reaction conditions. Only a few expensive nickel-based alloys or pure nickel metal materials are suitable for reactors, and due to the complex structure of fixed-bed reactors , The amount of materials required is larger, making the cost of the tubular fixed-bed reactor very expensive, and the economical efficiency of industrialization is poor
At the same time, local channeling will also cause the bed to overheat, and the active components of the catalyst will be lost.

Method used

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  • Preparation method of catalyst used for chlorine preparation, catalyst, and method used for preparing chlorine
  • Preparation method of catalyst used for chlorine preparation, catalyst, and method used for preparing chlorine

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0058] Preparation of slurry A:

[0059] Weigh 2kg boric acid, 5kg potassium dichromate, put into 100kg deionized water, then use 2mol L -1 hydrochloric acid solution to adjust the pH to 0.3, and fully stirred at room temperature for 3 hours to obtain slurry A-1, in which 2.25 g of insoluble matter was obtained.

[0060] Weigh 2kg boric acid, 10kg chromium trioxide, put into 100kg deionized water, and then use 0.1molL -1 The pH of the KOH solution was adjusted to 3.0, and it was fully stirred at room temperature for 3 hours to obtain slurry A-2, in which 4.93 g of insoluble matter was obtained.

[0061] Weigh 5kg of boric acid and 2kg of chromium chloride hexahydrate, put them into 100kg of deionized water, and then use 1molL -1 The pH of the nitric acid solution was adjusted to 1.0, and the mixture was fully stirred at room temperature for 3 hours to obtain slurry A-3, in which 1.71 g of insoluble matter was obtained.

[0062] Preparation of slurry B:

[0063] Put 35kg of...

Embodiment 1

[0067] Catalyst preparation:

[0068] At room temperature (about 25°C), slowly and continuously add 3L of slurry A-1 into 18L of vigorously stirred slurry B-1, the mixing temperature is 33°C, the residence time is about 15min, and the mixed slurry is used The twin-screw pump is fed into the centrifugal spray drying tower at a rate of 15L / h, and the materials are collected by a cyclone separator and a bag filter after the spray drying tower. The materials collected by the cyclone separator were roasted in a muffle furnace. The temperature rise rate of the muffle furnace was 2°C / min, and the roasting temperature was 500°C. The roasting time was about 1 hour and then cooled to obtain 8.6kg of finished catalyst.

[0069] After analysis, the average particle size of the catalyst is 56.1 μm, VMD / SMD=1.3, and the wear index is 1.1%. Catalyst performance test:

[0070] Put 1 kg of catalyst into a fluidized bed reactor with an inner diameter of 30mm and a height of 700mm, preheat the...

Embodiment 2

[0072] Catalyst preparation:

[0073] At room temperature (about 25°C), slowly and continuously add 1L of slurry A-2 into 20L of vigorously stirred slurry B-2, the mixing temperature is 32°C, the residence time is about 15min, and then the process is carried out as in Example 1 Spray drying, cyclone separation, bag dust removal to collect materials under the same conditions, cooling after calcination to obtain 8.1 kg of finished catalyst.

[0074] After analysis, the average particle size of the catalyst was 53.4 μm, VMD / SMD=1.2, and the wear index was 1.6%. Catalyst performance test:

[0075] The catalyst performance test was carried out as in Example 1, and the detailed information is listed in Table 1.

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Abstract

The present invention relates to a method for preparing catalyst used for preparing chloride by oxidizing hydrogen chloride. The method is mixing a slurry mainly containing boron and chromium with a slurry mainly containing copper, boron, alkali-metal elements, rare-earth elements, aluminum sol, silica sol, carrier and optionally other metal elements, the mixing temperature being not more than 100℃, and the residence time being not more than 120 minutes, the mixed slurry is successively treated with spray drying, high temperature calcination and the like, so that catalyst particles is obtained. The present invention also relates to the catalyst prepared through the method, uses of the catalyst used in the process of preparing chloride by oxidizing hydrogen chloride and a method for preparing chlorine by using the catalyst. The catalyst is used for preparing chlorine by oxidizing hydrogen chloride with oxygen or air in fluidized bed reactor, and has an excellent activity and anti-caking property, a relatively good mechanical strength and a relatively long service life.

Description

technical field [0001] The invention belongs to the field of catalysts, and mainly relates to a method for preparing a catalyst for producing chlorine by oxidizing hydrogen chloride, a catalyst prepared by the method, and a method for producing chlorine by using the catalyst. Background technique [0002] Chlorine gas is an important basic chemical raw material, widely used in polyurethane, silicone, epoxy resin, chlorinated rubber, chlorinated high polymer, chlorinated hydrocarbon and other new material industries, and in new energy industries such as polysilicon manufacturing. Used in household fine chemical industries such as disinfectants, detergents, food additives, cosmetic additives, etc., used in the synthesis of glycerin, chlorobenzene series, chloroacetic acid, benzyl chloride, PCl 3 Pesticide / pharmaceutical industries, as well as paper, textile, metallurgy and petrochemical industries. [0003] In most chlorine-consuming industries, there are two serious restrict...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/86B01J23/889C01B7/04
CPCB01J21/02C01B7/04B01J23/8892B01J23/868B01J37/0045B01J2523/00B01J37/0236B01J37/088B01J23/002B01J37/0009B01J23/8993B01J35/30B01J35/40B01J2523/13B01J2523/17B01J2523/305B01J2523/31B01J2523/3706B01J2523/3712B01J2523/41B01J2523/67B01J2523/72B01J2523/821B01J2523/23B01J21/12B01J37/0072B01J37/04B01J37/08
Inventor 楼银川吕杨易光铨邵亮锋张宏科华卫琦丁建生
Owner WANHUA CHEM GRP CO LTD
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