A method for selective hydrogenation of alkyne-containing carbon tetrafraction

A technology for selective hydrogenation and carbon four fractions, applied in the fields of hydrocarbons, chemical instruments and methods, hydrogenation to hydrocarbons, etc. Avoid bad factors and improve the effect of added value

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

AI Technical Summary

Problems solved by technology

[0014] The active components of conventional noble metal catalysts are prone to agglomeration and poisoning and deactivation during the reaction process, and the dispersion of palladium metal is a problem that many researchers are trying to solve

Method used

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  • A method for selective hydrogenation of alkyne-containing carbon tetrafraction
  • A method for selective hydrogenation of alkyne-containing carbon tetrafraction
  • A method for selective hydrogenation of alkyne-containing carbon tetrafraction

Examples

Experimental program
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Effect test

preparation example Construction

[0054] The preparation of catalysts 1-6 for the examples

[0055] Preparation of catalyst C1:

[0056] The concentration of 4L is 50g Al 2 O 3 The sodium metaaluminate solution of / L is placed in a stainless steel container with a stirrer and the bottom of the tank can pass gas, the nickel nitrate solution is prepared and put into the container at a high position, and the mixed gas of carbon dioxide and air is introduced, and the peristaltic pump is started at the same time. Control the flow rate and add the prepared nickel nitrate solution dropwise, the carbon dioxide concentration in the mixed gas is 70v%, and the flow rate is 4Nm 3 / h, the reaction temperature was 40°C, the pH value of the reaction end was 10, carbon dioxide was stopped, aged for 30 minutes, the mother liquor was separated by filtration, washed, and dried at 120°C for 5 hours to obtain nickel-containing pseudoboehmite.

[0057] The nickel-containing pseudo-boehmite was mixed and kneaded with nitric acid ...

Embodiment 1

[0084] The alkyne-rich C4 fraction is diluted with raffinate C4, and the weight ratio of the alkyne-rich C4 fraction to the raffinate C4 is 1:1. The isothermal reactor adopts a single-stage isothermal bubbling bed, and uses catalyst C1, which is reduced at 120 °C for 6 hours under a hydrogen atmosphere. The reaction inlet temperature is 50℃, the reaction pressure is 1.5MPa, and the liquid space velocity is 7h -1 , the molar ratio of hydrogen to alkyne is 3.5, and Table 2 shows the composition of materials before and after the reaction.

[0085] Table 2 Material composition before and after the reaction

[0086]

Embodiment 2

[0088] The alkyne-rich C4 fraction is diluted with raffinate C4 and cracked C4, and the weight ratio of the alkyne-rich C4 fraction to (raffinate C4+cracked C4) is 1:6. The isothermal reactor adopts a single-stage isothermal bubbling bed, and uses catalyst C2, which is reduced at 120 °C for 6 hours under a hydrogen atmosphere. The reaction inlet temperature is 60℃, the reaction pressure is 2.0MPa, and the liquid space velocity is 12h -1 , the molar ratio of hydrogen to alkyne is 2.5, and Table 3 shows the composition of materials before and after the reaction.

[0089] Table 3 Material composition before and after the reaction

[0090]

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Abstract

A method for selective hydrogenation of alkyne-containing carbon tetrafraction, using butadiene-rich alkyne-rich carbon tetrafraction as a raw material, in the presence of a catalyst, using an isothermal reactor, selective hydrogenation to obtain 1,3- For butadiene, the operating conditions of the process are as follows: the reaction temperature is 30-75°C, the reaction pressure is 1.0-3.0MPa, and the liquid space velocity is 7-18h ‑1 . The catalyst is a palladium-molybdenum catalyst prepared on a nickel-containing alumina carrier with a specific crystal form, which can greatly improve the dispersion and utilization of active metals, and improve the hydrogenation performance of the catalyst. Adopting the method of the invention has very obvious good effects on the effective utilization of the C4 fraction rich in alkynes after the extraction of butadiene, reduction of waste of resources and improvement of economic benefits.

Description

technical field [0001] The invention relates to a method for selective hydrogenation of alkyne-containing carbon four fractions, in particular to a method for recovering butadiene by selective hydrogenation of alkyne-rich carbon four fractions after butadiene extraction. Background technique [0002] The pyrolysis carbon four fractions produced by high-temperature pyrolysis of hydrocarbons to ethylene usually contain 40% to 60% mass fraction of butadiene, which is an important monomer in the synthetic rubber industry. Butadiene is usually extracted from the four fractions of cracked carbon by solvent extraction methods, such as acetonitrile method, N-methylpyrrolidone method and dimethylformamide method. Due to the high concentration of alkynes in the extracted C4 fraction, and there is no industrial value at present, it can only be used for combustion. It is considered that the same amount of butadiene should be discharged at the same time when separating alkynes, and it n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/167C07C5/09C07C11/167B01J23/89
CPCB01J23/002B01J23/8993B01J2523/00C07C5/09C07C7/167C07C2523/89C07C11/167B01J2523/11B01J2523/31B01J2523/68B01J2523/824B01J2523/847B01J2523/22B01J2523/13B01J2523/3706B01J2523/3712
Inventor 郑云弟马好文王斌胡晓丽孙利民展学成钱颖王书峰潘曦竹蒋彩兰尹玲玲李燕
Owner PETROCHINA CO LTD
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