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Pyrolysis gasoline cut fraction section selective hydrogenation method

A pyrolysis gasoline and selective technology, which is applied in the field of one-stage selective hydrogenation of pyrolysis gasoline fractions, can solve the problems of small pore volume, easy coking and clogging of the pores on the catalyst, affecting the hydrogenation stability of the catalyst, etc., and achieves good hydrogenation performance, The effect of good hydrogenation activity and stability

Active Publication Date: 2009-05-13
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN85100761A discloses a fiber-supported catalyst for selective hydrogenation of diolefins in pyrolysis gasoline fractions. The invention is characterized in that it adopts a specific surface of 20 to 150m 2 / g, η-Al with a pore volume of 0.1-0.3ml / g 2 o 3 Porous fibrous carrier, the catalyst has high initial activity, but the pore volume is too small. When the content of colloid, arsenic, and water in the raw material of the pyrolysis gasoline hydrogenation unit exceed the standard, the upper pores of the catalyst are easy to coke and block, which affects the hydrogenation stability of the catalyst

Method used

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  • Pyrolysis gasoline cut fraction section selective hydrogenation method
  • Pyrolysis gasoline cut fraction section selective hydrogenation method

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preparation example Construction

[0027] The preparation of catalyst 1~5:

[0028] ① Add 180ml of water to 300g of alumina powder, knead and extrude to shape, dry in the air at 120°C, bake at 560°C for 4 hours, then weigh a certain amount of lanthanum nitrate and / or cerium nitrate, alkaline earth metal The nitrate is dissolved in water, impregnated on the carrier, dried in the air at 120°C, and roasted at 850-1100°C for 4-6 hours to obtain modified Al 2 o 3 carrier.

[0029]Weigh a certain amount of palladium chloride powder with a palladium content of not less than 59%, add 200ml of water, then add hydrochloric acid, dissolve and dilute to 1-1.2L with deionized water, adjust the pH value according to the required shell thickness; Take 1.0kg of the finished carrier, add deionized water to pre-soak the carrier, and then filter the water; pour the prepared palladium chloride solution onto the carrier, filter the water after 20 minutes, dry at 120°C, and roast at 400-450°C for 4 Hours, fresh catalysts 1, 2, 3,...

Embodiment 1

[0036] Put the fresh catalyst 1 into a 100ml adiabatic bed reaction device, reduce it for 7 hours under the conditions of pressure 0.03MPa, temperature 120°C, and volume ratio of hydrogen to catalyst 200:1, then feed the raw material oil after cooling down to 40°C; the reaction process conditions are: The inlet temperature is 40°C, the volume ratio of hydrogen to oil is 350:1, the reaction pressure is 2.8MPa, and the fresh oil space velocity is 3.0h -1 ; The average diene of the hydrogenation product within 170 hours of operation is 0.77 gram of iodine / 100 gram of oil, and the iodine value is 26.1 gram of iodine / 100 gram of oil.

Embodiment 2

[0038] Put the fresh catalyst 2 into a 100ml adiabatic bed reaction device, reduce it for 9 hours under the conditions of pressure 0.03MPa, temperature 100°C, and volume ratio of hydrogen to catalyst 500:1, then feed the raw material oil after cooling down to 40°C; the reaction process conditions are: The inlet temperature is 45°C, the volume ratio of hydrogen to oil is 200:1, the reaction pressure is 2.5MPa, and the space velocity of fresh oil is 3.5h -1 ; The average diene of the hydrogenation product within 168 hours of operation is 0.42 gram of iodine / 100 gram of oil, and the iodine value is 27.65 gram of iodine / 100 gram of oil.

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Abstract

The invention relates to a first-stage selectivity hydrogenation method for pyrolysis gasoline fractions, which uses palladium series hydrogenation catalyst which is used after being reduced. The first-stage selectivity hydrogenation method for the pyrolysis gasoline fractions is characterized in that the hydrogenation technological conditions are as follows: the volume space velocity of a liquid is less than or equal to 5h<-1>, the inlet temperature of a reactor is between 28 and 120 DEG C, the reaction pressure is more than or equal to 2.4 MPa, and the hydrogen / oil volume ratio is between 50 and 500; the palladium series hydrogenation catalyst takes theta-type alumina or theta and alpha mixed crystal type alumina giving priority to theta type as a carrier, takes metallic palladium as an active ingredient, and contains 0.2 to 0.5 weight percent of the active ingredient-the palladium, 2 to 8 weight percent of auxiliary agent-lanthanum and / or cerium, and 2 to 8 weight percent of alkaline earth element as calculated by 100 weight percent of the catalyst; and the catalyst can still be used by regeneration after being subjected to coking and deactivation. Under the condition of the application method and the technological conditions, the catalyst has good hydrogenation performance, and particularly still has good hydrogenation activity and stability when hydrogenation raw materials contain trace water and colloids.

Description

technical field [0001] The invention relates to a one-stage selective hydrogenation method for pyrolysis gasoline fraction, and the method is especially suitable for the selective hydrogenation of diolefin unsaturated hydrocarbons. Background technique [0002] Pyrolysis gasoline is a by-product in the ethylene production process, and its output is more than 50% to 80% of the ethylene production capacity, of which the aromatic content is as high as 50%, which is an important aromatic resource, which contains highly unsaturated hydrocarbons, such as: diolefins, Styrene, etc., undergoes selective hydrogenation to make it into the corresponding monoolefin, which is used as the raw material for extracting aromatics. In recent years, the ethylene industry has achieved unprecedented development, and the production capacity of ethylene has been increasing year by year. The output of pyrolysis gasoline, which is an important by-product of ethylene, is bound to increase significantly...

Claims

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Application Information

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IPC IPC(8): C10G45/34
Inventor 梁顺琴钱颖曹凤霞谢元李晓艳吴杰蒋彩兰王廷海郑云弟吕龙刚孙利民
Owner PETROCHINA CO LTD
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