A kind of method that adopts trickle-bed reactor to carry out hydrogen chloride oxidation to prepare chlorine

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

Active Publication Date: 2019-04-19
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of method that adopts trickle-bed reactor to carry out hydrogen chloride oxidation to prepare chlorine
  • A kind of method that adopts trickle-bed reactor to carry out hydrogen chloride oxidation to prepare chlorine
  • A kind of method that adopts trickle-bed reactor to carry out hydrogen chloride oxidation to prepare chlorine

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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) in 50ml of aqueous solution, impregnated in 50g 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 gas by oxidizing hydrogen chloride in a trickle bed reactor. After mixing the air flow containing molecular oxygen and the air flow containing hydrogen chloride in a gas phase, they are mixed with high-temperature inert liquid medium, and then the preheated The mixed material is passed into a trickle bed reactor, and oxychlorination reaction is carried out under the action of a catalyst to prepare chlorine gas. At the same time, inert liquid medium is injected into different axial positions of the trickle bed reactor to form an axial temperature gradient in the reactor to increase the conversion rate. This method can effectively strengthen the mass transfer and heat transfer effects of the catalytic reaction process, ensure the controllability of the temperature distribution in the reactor, form an axial temperature gradient inside the reactor, improve the reaction heat utilization efficiency and reaction conversion rate, and reduce the reaction rate. material used.

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 Patents(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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