A catalytic gasoline hydrogenation dearsenic agent and its preparation method and application

A technology for catalytic gasoline and arsenic removal, which is applied in chemical instruments and methods, physical/chemical process catalysts, heterogeneous catalyst chemical elements, etc. The arsenic removal activity and selectivity of the material content have a great influence, restricting the arsenic removal activity and service life of the arsenic removal agent, and achieving the effect of large average pore size, strong operability, and strong carbon capacity

Active Publication Date: 2021-06-01
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] To sum up, the above-mentioned technology is mainly used in the dearsenic reaction of naphtha and constant top gasoline mainly composed of alkanes, as well as light diesel oil and gaseous hydrocarbons, and is not specifically aimed at gasoline, especially catalytic gasoline with high olefin content. , the existing literature only reflects its dearsenic activity, but does not reflect the changes of olefins and octane numbers during hydrodearsenication
At the same time, the existing technology is mainly based on single Ni and Mo-Ni-P systems, and the pore distribution characteristics and oxide content have a great influence on the arsenic removal activity and selectivity
Since the catalytic gasoline components contain a certain amount of diolefins and a large amount of olefins, hydrogenation saturation reaction is prone to occur during hydrogenation dearsenication, resulting in loss of octane number, and at the same time, the coke generated by the polymerization of diolefins blocks the pores and accelerates the loss of carbon deposition in the arsenic removal agent. activity, which restricts the dearsenic activity and service life of the dearsenic agent, it is particularly important to develop a macroporous hydrogen dearsenic agent with abundant interstitial pores

Method used

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  • A catalytic gasoline hydrogenation dearsenic agent and its preparation method and application
  • A catalytic gasoline hydrogenation dearsenic agent and its preparation method and application
  • A catalytic gasoline hydrogenation dearsenic agent and its preparation method and application

Examples

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preparation example Construction

[0039] A preparation method of catalytic gasoline hydrogenation dearsenic agent, comprising the following steps:

[0040] Step 1: Mix alumina or a mixture of alumina and titanium oxide with scallop powder evenly, add organic polymer pore-forming agent, binder and deionized water, knead, extrude, and dry at 100-150°C for 3-6 hours , heat treatment at 650-1000°C for 3-6 hours at high temperature to prepare arsenic-removing agent carrier;

[0041] Step 2: The arsenic removal agent carrier is subjected to hydrothermal treatment to expand the pores, the treatment temperature is 400-700°C, and the mass space velocity is 0.5-1.5h -1 , treated for 1-10 hours to obtain arsenic-removing agent-modified carrier;

[0042] Step 3, dissolve the active components nickel salt and molybdenum salt in one or more of citric acid, ammonia water and deionized water to form a stable two-component active metal complex solution, and then use the two-component active metal complex Immerse the modified...

Embodiment 1

[0049] Weigh 100g of pseudo-boehmite, add 3.0g of fenugreek powder, and then add 3% nitric acid aqueous solution, knead and extrude, dry at 120°C for 4h, and then roast at 750°C for 4h to obtain arsenic removal agent carrier A (see Table 1 for properties). Weigh 20.0g of the carrier and put it into a beaker, add excess deionized water and let it stand for 3 hours, then remove the excess water on the surface of the carrier, compare the weight w1 of the carrier before immersion and the weight w2 of the carrier after immersion to calculate its water absorption, and then follow the equal volume immersion method , according to the water absorption of the carrier, the preparation of the active component impregnation solution is carried out. First weigh 60ml of ammonia water, then add 30g of nickel acetate and 3.7g of ammonium molybdate and stir until dissolved, and finally dilute with ammonia water. The carrier was impregnated by an equal volume impregnation method, so that the cat...

Embodiment 2

[0051] Weigh out 3% TiO 2 Add 100g of pseudo-boehmite to 100g of pseudo-boehmite, add 3.0g of fenugreek powder, 5g of organic polymer pore-forming agent polyvinyl alcohol with a particle size of 200μm, and then add 3% aqueous nitric acid solution, knead, extrude, and dry at 120°C for 4h , and then roasted at 750°C for 4h, then hydrothermally treated, the treatment conditions are: reaction temperature 600°C, mass space velocity 0.5h -1 , 4h, prepared carrier B (properties are shown in Table 1). The metal active component impregnation method, impregnation amount of nickel salt and molybdenum salt, drying and roasting conditions were the same as those in Example 1, and arsenic removal agent sample T2 was obtained.

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Abstract

The invention relates to a catalytic gasoline hydrogenation arsenic removal agent and its preparation method and application. The arsenic removal agent is composed of 7-20wt% NiO and 2.5-4.9wt% MoO 3 , 0~15wt% TiO 2 , and the rest are Al 2 o 3 . The preparation method comprises the following steps: uniformly mixing aluminum oxide or a mixture of aluminum oxide and titanium oxide with squash powder, adding organic polymer pore-forming agent, binder and deionized water, kneading, extruding, drying, and high temperature Heat treatment to obtain the carrier of the arsenic removal agent; conduct hydrothermal treatment on the carrier of the arsenic removal agent to expand the pores to obtain a modified carrier of the arsenic removal agent; dissolve the active component nickel in one or more of citric acid, ammonia water and deionized water Salt and molybdenum salt, formulated into a stable two-component active metal complex solution, and then impregnated with the arsenic-removing agent to modify the carrier to obtain a finished arsenic-removing agent. The arsenic removal agent is used for the arsenic removal of catalytic gasoline with high olefin content, has strong carbon capacity, high arsenic removal activity (above 90%), good arsenic removal selectivity (above 99%), does not cause olefin saturation, and is octane-free value loss.

Description

technical field [0001] The present invention relates to a gasoline dearsenic agent and a preparation method thereof, in particular to a dearsenic agent with abundant mesopores for catalytic gasoline dearsenic, more specifically a dearsenic agent for catalytic gasoline or heavy gasoline It is a hydrogen dearsenic agent with abundant mesopores for raw material dearsenization, which will not cause olefin saturation and octane number loss in gasoline during the dearsenic process. Background technique [0002] Hydrogenation technology is one of the main methods to clean gasoline in my country. Refining companies generally use hydrogenation technology to reduce the sulfur content in gasoline. However, arsenic compounds in raw oil are toxic substances in the hydrogenation process, and a very small amount of arsenic compounds will cause permanent poisoning and deactivation of the hydrogenation catalyst, shorten the long-term operation period of the device, and bring greater economic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/883C10G45/08
CPCB01J23/002B01J23/883B01J2523/00C10G45/08C10G2300/202B01J2523/31B01J2523/47B01J2523/68B01J2523/847
Inventor 鞠雅娜兰玲刘坤红钟海军葛少辉李天舒胡亚琼冯琪李阳吕忠武赵秦峰王书芹姜增坤侯远东王鹏马建波鲁旭
Owner PETROCHINA CO LTD
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