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Method for preparing chlorine by performing hydrogen chloride oxidation by trickle bed reactor

A reactor and trickle bed technology, which is applied in the field of hydrogen chloride oxidation to prepare chlorine gas, can solve the problems of poor industrial adaptability, difficult temperature control, and low conversion rate of hydrogen chloride, and achieve less side reactions in the liquid phase, high conversion rate, and avoid recovery. Effect

Active Publication Date: 2017-09-01
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] The process using a fluidized bed as a reactor has the disadvantages of low conversion rate of hydrogen chloride and complicated process operation;
[0017] The process of using a fixed bed as a reactor has the disadvantages of difficult temperature control and easy deactivation of the catalyst;
[0018] The process of using a slurry bed as a reactor has the disadvantages of difficulty in separating fine powder catalysts and inert liquid media, and poor industrial adaptability

Method used

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  • Method for preparing chlorine by performing hydrogen chloride oxidation by trickle bed reactor
  • Method for preparing chlorine by performing hydrogen chloride oxidation by trickle bed reactor
  • Method for preparing chlorine by performing hydrogen chloride oxidation by trickle bed reactor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0116] Preparation of Catalyst 1

[0117] will contain 30g CuCl 22H 2 O, and containing dispersant 0.5g potassium oxalate cuprate dihydrate (K 2 [Cu(C 2 o 4 ) 2 ]·2H 2 O) 50ml of aqueous solution, impregnated in 50g of blank carrier γ-alumina powder for more than 12hr, then dried at 90°C for 16hr, and redispersed the obtained solid in a solution containing 1.2gKCl and 8g Ce(NO 3 ) 3 ·Immerse again in 100ml of 6H2O aqueous solution for more than 12 hours, and then dry at 90°C for 16 hours. The catalyst was extruded and then calcined at 500° C. for 4 hours to obtain a solid active catalyst 1 . Finally, the atomic ratio of copper, potassium and cerium in the catalyst is about 1:0.1:0.1, and the total amount of metal salt and oxide in the catalyst is 21.02g.

Embodiment 2

[0119] Preparation of Catalyst 2

[0120] will contain 4.7g CuCl 2 2H 2 O. Potassium oxalate cuprate dihydrate containing 0.5 g of dispersant (K 2 [Cu(C 2 o 4 ) 2 ]·2H 2 O) in 50ml of aqueous solution, impregnated with 50g blank carrier HY molecular sieve for more than 12hr, then dried at 90°C for 16hr, and redispersed the obtained solid in a solution containing 12.5g Ce(NO 3 ) 3 ·6H 2 In 100ml of aqueous solution of O, soak again for more than 12 hours, and then dry at 90°C for 16 hours. The catalyst was extruded and then calcined at 500°C for 4 hours to obtain catalyst 2. Finally, the atomic ratio of copper, potassium and cerium in the catalyst is about 1:0.1:1, and the final total of metal salt and oxide in the catalyst is 7.22g.

Embodiment 3

[0122] Preparation of Catalyst 3

[0123] will contain 8g CuCl 2 2H 2 O. Potassium oxalate cuprate dihydrate containing 2.5 g of dispersant (K 2 [Cu(C 2 o 4 ) 2 ]·2H 2 O) in 50ml of aqueous solution, impregnated with 50g of blank carrier HY molecular sieve for more than 12hr, then dried at 90°C for 16hr, and redispersed the obtained solid in a solution containing 11.2g of Ce(NO 3 ) 3 ·6H 2 O. Immerse again in 100ml of 3.5g KCl aqueous solution for more than 12hr, and then dry at 90°C for 16hr. The catalyst was extruded and then calcined at 500° C. for 4 hours to obtain catalyst 3 . Finally, the atomic ratio of copper, potassium and cerium in the catalyst is about 1:0.75:0.5, and the final total of metal salt and oxide in the catalyst is 11.5g.

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Abstract

The invention discloses a method for preparing chlorine by performing hydrogen chloride oxidation by a trickle bed reactor. The method comprises the following steps: mixing airflow containing molecular oxygen and airflow gaseous phase containing hydrogen chloride, mixing the mixture and a high-temperature inert liquid medium, introducing the preheated mixed materials into the trickle bed reactor, and performing oxychlorination reaction under the action of a catalyst to prepare chlorine. Meanwhile, the inert liquid mediums are injected into different positions of the axial direction of the trickle bed reactor, and axial temperature gradient is formed in the reactor, so that the conversion rate is increased. By the method, the mass transfer and heat transfer effects of the catalytic reaction process can be effectively enhanced, the controllability of temperature distribution in the reactor is guaranteed, the axial temperature gradient is formed in the reactor, the reaction heat utilization efficiency is improved, the reaction conversion rate is increased, and use of reactor materials is reduced.

Description

technical field [0001] The invention relates to a method for preparing chlorine gas by oxidation of hydrogen chloride, in particular, a process for preparing chlorine gas by carrying out strong exothermic oxychlorination reaction in a novel trickle bed reactor. Background technique [0002] Chlorine gas and liquid chlorine are the primary raw materials for the production of various chlorine-containing products. Industrial chlorine is mainly obtained through electrolysis of salt water and caustic soda. At present, there is a large excess of caustic soda and a shortage of chlorine in the world. [0003] In the field of chemical industry, in the preparation of many chemical products using chlorine or phosgene, there will be a large amount of by-product hydrogen chloride. The by-product hydrogen chloride is cheap, has a small demand, but is highly corrosive, and the neutralization discharge will cause environmental pollution. Therefore, the preparation of chlorine gas from hyd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/04B01J8/02B01J23/83B01J37/02B01J37/08
CPCB01J8/025B01J8/0278B01J23/83B01J37/0009B01J37/0201B01J37/082C01B7/04Y02P20/20
Inventor 罗务习宰章伟张宏科华卫琦
Owner WANHUA CHEM GRP CO LTD
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