A kind of dechlorination agent and preparation method thereof

A dechlorination agent and carrier technology, which is applied in the field of dechlorination agent and its preparation, can solve the problems of dechlorination agent pulverization, dechlorination agent removal, chloride exceeding the standard, etc., and achieve reduced acidity enhancement, high dechlorination precision, The effect of high utilization

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

AI Technical Summary

Problems solved by technology

[0005] The currently disclosed dechlorination agents pay less attention to the dechlorination process in a high-olefin environment. The product gas of propane dehydrogenation contains a large amount of olefins and some dienes, which are prone to polymerization under HCl catalyzed conditions to form green oil, which blocks dechlorination. In addition, olefins or diolefins will react with HCl to form organic chlorides, which cannot be effectively removed by dechlorination agents, and then enter downstream products, resulting in excessive chlorides
At the same time, the product gas of propane dehydrogenation contains a large amount of water, which may cause problems such as pulverization and hardening of the dechlorination agent

Method used

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  • A kind of dechlorination agent and preparation method thereof

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Comparison scheme
Effect test

Embodiment 1

[0038] (1) Weigh 75g Al(NO 3 ) 3 9H 2 O, 1.18g Ca(NO 3 ) 3 4H 2 O was dissolved in 150ml of deionized water to form a solution, and stirred for 1 hour; the solution was heated to 50°C, and the pH was controlled to be 9 with 10wt% ammonia solution; after filtering, washing with deionized water, acidified with 12mol / L nitric acid solution Stir until the pH is 6, stir until it is in the form of a sol, and obtain the carrier slurry. Use a 5mL syringe to take the slurry, install a needle, and add the slurry dropwise to the oily ammonia column. The sol shrinks into a spherical gel, take out the gel ball, and heat at 120°C Drying under the same conditions for 12 hours, and calcining at 1100°C for 10 hours to obtain composite alumina carrier pellets, the crystal form of alumina is θ-type as detected by XRD;

[0039] (2) Weigh 2.65g Na 2 CO 3 Dissolve in 10ml of deionized water, make a solution and stir evenly, immerse the composite alumina carrier pellets prepared in step (1) i...

Embodiment 2

[0045] (1) Weigh 75g Al(NO 3 ) 3 9H 2 O, 2.36g Ca(NO 3 ) 3 4H 2 Dissolve O in 150ml of deionized water to form a solution, and stir for 1 hour; heat the solution to 50°C, and control the pH to 9 with 10wt% ammonia solution; filter, wash with deionized water, and acidify with 10mol / L nitric acid solution Stir until the pH is 6, stir until it is in the form of a sol, and obtain the carrier slurry. Use a 5mL syringe to take the slurry, install a needle, and add the slurry dropwise to the oily ammonia column. The sol shrinks into a spherical gel, take out the gel ball, and heat at 120°C Drying under the same conditions for 12 hours, and calcining at 1100°C for 10 hours to obtain composite alumina carrier pellets; XRD detection shows that the crystal form of alumina is θ type;

[0046] (2) Weigh 2.65g Na 2 CO 3 Dissolve in 10ml of deionized water, make a solution and stir evenly, immerse the composite alumina carrier pellets prepared in step (1) in equal volumes in the prepa...

Embodiment 3

[0050] (1) Weigh 75g Al(NO 3 ) 3 9H 2 O, 3.54g Ca(NO 3 ) 3 4H 2 O was dissolved in 150ml of deionized water to form a solution, and stirred for 1 hour; the solution was heated to 50°C, and the pH was controlled to be 9 with 10wt% ammonia solution; after filtering, washing with deionized water, acidified with 15mol / L nitric acid solution Stir until the pH is 5, stir until it is in the form of a sol, and obtain the carrier slurry, use a 5mL syringe to take the slurry, install a needle, add the slurry dropwise to the oily ammonia column, the sol shrinks into a spherical gel, take out the gel ball, and heat at 120°C Drying under the same conditions for 12 hours, and calcining at 1100°C for 10 hours to obtain composite alumina carrier pellets; XRD detection shows that the crystal form of alumina is θ type;

[0051] (2) Weigh 2.65g Na 2 CO 3 Dissolve in 10ml of deionized water, make a solution and stir evenly, immerse the composite alumina carrier pellets prepared in step (1)...

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Abstract

The invention discloses a dechlorination agent and a preparation method thereof. The dechlorination agent uses a composite oxide as a carrier to support oxides of alkali metals and / or alkaline earth metals, and the composite oxide carrier includes θ-type alumina and calcium oxide. The invention prepares the composite oxide carrier through the co-precipitation method, introduces calcium oxide into the carrier skeleton structure, and the penetration chlorine capacity can reach 17.6% at normal temperature. Through high-temperature calcination, the alumina with theta-type phase structure is prepared, which reduces the number of surface hydroxyl groups, minimizes the physical adsorption of HCl on the dechlorination agent, and reduces the acidity of the surface of the dechlorination agent due to the physical adsorption and concentration of HCl. Enhanced phenomenon, thereby reducing the acid-catalyzed olefin polymerization to produce green oil, and the acid-catalyzed reaction of olefins with HCl to form organic chlorides. In addition, the composite oxide carrier prepared by the invention significantly increases the strength of the dechlorination agent and eliminates the phenomenon of agglomeration or pulverization under the condition of water vapor.

Description

technical field [0001] The invention relates to the technical field of gas purification, in particular to a dechlorination agent and a preparation method thereof. Background technique [0002] In recent years, the process of preparing propylene from propane dehydrogenation has developed rapidly in China, and the vast majority of manufacturers use the Oleflex process of UOP Company. Chlorides need to be introduced during the catalyst regeneration process of this process, and this part of chlorides eventually enters the reaction product in the form of HCl, thereby adversely affecting various aspects of the process flow. [0003] HCl is a harmful gas with high corrosiveness and high reactivity. Even a trace amount of HCl will adversely affect the subsequent production process. Its main industrial hazards are reflected in the following aspects: (1) Catalyst poisoning: Chlorine has strong acidity, which is easy to increase the acid catalytic function of the catalyst and increase...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/68B01D53/81
CPCB01D53/68B01D53/81B01D2257/2045B01D2258/02
Inventor 孔祥明蒋锋李江冯培广常林王磊张宏科华卫琦
Owner WANHUA CHEM GRP CO LTD
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