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A method for the hydrogenation of diolefins

A diene, alumina carrier technology, applied in the field of diene hydrogenation, can solve the problems of easy deactivation, poor impurity resistance of the catalyst, short operation cycle, etc., and achieve good reaction performance, hydrogenation selectivity and activity stability Good, improve the effect of hydrogenation activity

Inactive Publication Date: 2019-01-22
QINZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] At present, the researched and developed diene hydrogenation method has better operation performance and a longer industrial application cycle when the raw material mono-olefin content is less than 15% for hydrogenation of low-carbon hydrocarbons, but when the content of low-carbon hydrocarbons is greater than 2% When the total olefin content is greater than 8%, the catalyst has poor resistance to impurities, is easy to deactivate, and has a short operating cycle

Method used

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  • A method for the hydrogenation of diolefins
  • A method for the hydrogenation of diolefins

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] First, 8.0 g of the water-soluble chitosan pore-enlarging agent was added to deionized water at 50° C., and then acetic acid was added dropwise until the chitosan was completely dissolved to obtain an acid solution containing the pore-enlarging agent. Weigh a certain amount of lanthanum nitrate and potassium nitrate respectively, completely dissolve the lanthanum nitrate and potassium nitrate in 70 g of distilled water to prepare an aqueous solution containing lanthanum and potassium. Weigh 350g of pseudo-boehmite powder and 20.0g of fenugreek powder into the kneader, and mix evenly, then add the mixed solution of lanthanum nitrate and potassium nitrate, and finally add the acid solution containing chitosan to the pseudo-boehmite The stone powder is evenly kneaded, and then kneaded-extruded into a clover shape. Dry at 120° C. for 8 hours, and calcined at 700° C. for 4 hours to obtain alumina carrier 1 containing lanthanum and potassium. La in carrier 1 2 o 3 0.5wt%,...

Embodiment 2

[0044] Add 8.0 g of the water-soluble chitosan pore-enlarging agent into deionized water at 50° C., and then add acetic acid dropwise until the chitosan is completely dissolved to obtain an acid solution containing the pore-enlarging agent. Weigh a certain amount of lanthanum nitrate and potassium nitrate respectively, completely dissolve the lanthanum nitrate and potassium nitrate in 70 g of distilled water to prepare an aqueous solution containing lanthanum and potassium. Weigh 350g of pseudo-boehmite powder and 20.0g of fennel powder into the kneader, mix well, then add the mixed solution of lanthanum nitrate and potassium nitrate, and finally add the acid solution containing chitosan to the pseudo-boehmite The aluminum stone powder is evenly kneaded, and then kneaded-extruded into a clover shape. Dry at 120°C for 8 hours, and calcined at 700°C for 4 hours to obtain an alumina carrier containing lanthanum and potassium. Then use lanthanum and potassium to modify the surfac...

Embodiment 3

[0049] The preparation method of the carrier was carried out according to Example 1. The difference is that the water-soluble chitosan pore-enlarging agent is replaced by a non-water-soluble chitosan pore-enlarging agent, and the chitosan formic acid solution is stirred for 30 minutes with a magnetic stirrer. An alumina support 3 with a macroporous structure was obtained. The content of auxiliary components lanthanum and potassium in the carrier accounted for the percentage of the carrier mass is respectively La 2 o 3 1.8wt%, K 2 O2.0 wt%. Its specific surface area and pore size distribution are shown in Table 1.

[0050] Get palladium chloride, add chloroauric acid into 30ml distilled water, add ammonia water to adjust the pH value at 3.0, then dilute with deionized water, make an impregnating solution and impregnate 100 g of spherical alumina carriers with a macroporous structure, and the obtained catalyst front The body was dried at 120°C for 6 hours and then calcined ...

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Abstract

The invention discloses a method for hydrogenation of diolefin. According to the method, a fixed bed reactor is used, the catalyst is a palladium-based supported catalyst, the catalyst carrier is an alumina carrier having a macroporous structure, and the process conditions of the reaction comprise that the reaction temperature is 20-90 DEG C, the reaction pressure is 1.0-4.0 MPa, a molar ratio of hydrogen to diolefin 1.0-3.0, and the volume space velocity is 1.0-10.0 h<-1>. According to the present invention, the method has characteristics of mild hydrogenation reaction process conditions, high diolefin conversion rate and low monoolefin hydrogenation saturation rate, and the catalyst has characteristics of low precious metal active center loss and good activity stability.

Description

technical field [0001] The invention relates to a method for hydrogenation of diolefins, more specifically a diolefin hydrogenation catalyst using alumina with a macroporous structure as a carrier for the hydrogenation reaction of diolefins. Background technique [0002] With the development of oil refining industry at home and abroad, secondary processing units account for an increasing proportion in the crude oil processing process, especially with the continuous development of ethylene cracking and catalytic cracking technology and the continuous deterioration of raw material quality, refineries and ethylene plants C4 -C6 resources have become more abundant, and the deep processing of low-carbon hydrocarbons has gradually received attention. Many refining and chemical integration enterprises in my country generally have the problem of excess C4-C6 fractions and low utilization rate. At present, except for a small amount of C4 produced by refineries through etherification...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/52C10G45/40B01J23/10
CPCB01J23/002B01J23/10B01J23/52B01J2523/00C10G45/40C10G2300/1092B01J2523/13B01J2523/31B01J2523/3706B01J2523/19B01J2523/824
Inventor 罗祥生石海信颜曦明
Owner QINZHOU UNIV
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