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A kind of method of alkyne selective hydrogenation recovery butadiene

A technology for selective hydrogenation and butadiene, applied in chemical recovery, chemical instruments and methods, purification/separation of hydrocarbons, etc. It can solve the problems of easy agglomeration, poisoning and deactivation of active components, and achieve hydrogenation stability. And the effect of strong anti-coking performance, extended life and wide range of operating conditions

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 kind of method of alkyne selective hydrogenation recovery butadiene
  • A kind of method of alkyne selective hydrogenation recovery butadiene
  • A kind of method of alkyne selective hydrogenation recovery butadiene

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Experimental program
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Effect test

preparation example Construction

[0054] Embodiment uses the preparation of catalyst 1~6

[0055] Preparation of Catalyst C1:

[0056] Concentrate 4L to 50g Al 2 o 3 / L of sodium metaaluminate solution is placed in a stainless steel container with a stirrer and gas can be introduced into the bottom of the tank, the nickel nitrate solution is prepared and placed in a high-position container, a mixed gas of carbon dioxide and air is introduced, and the peristaltic pump is started at the same time Control the flow rate and drop the prepared nickel nitrate solution, the carbon dioxide concentration in the mixed gas is 70v%, and the flow rate is 3Nm 3 / h, the reaction temperature is 35°C, the pH value at the end of the reaction is 9.5, stop feeding carbon dioxide, age for 30 minutes, filter and separate the mother liquor, wash, and dry at 120°C for 5 hours to obtain nickel-containing pseudo-boehmite.

[0057] Mix and knead nickel-containing pseudo-boehmite with nitric acid and water, extrude into strips, dry at ...

Embodiment 1

[0083] The C4 fraction rich in alkynes is diluted with the C4 raffinate, and the weight ratio of the C4 fraction rich in alkynes to the C4 raffinate is 1:1. The adiabatic reactor adopts a single-stage adiabatic bubbling bed, using catalyst C1, and the catalyst is reduced at 120°C for 6h under a hydrogen atmosphere. The reaction inlet temperature is 45°C, the reaction pressure is 1.0MPa, and the liquid space velocity is 10h -1 , the molar ratio of hydrogen to alkyne is 3.0, Table 2 is the composition of materials before and after the reaction.

[0084] Material composition before and after table 2 reaction

[0085]

Embodiment 2

[0087] Dilute the alkyne-rich C4 fraction with raffinate C4 and cracked C4, and the weight ratio of the alkyne-rich C4 fraction to (raffinate + cracked C4) is 1:2. The adiabatic reactor adopts a single-stage adiabatic bubbling bed, using catalyst C2, and the catalyst is reduced at 120°C for 6 hours under a hydrogen atmosphere. The reaction inlet temperature is 30°C, the reaction pressure is 1.5MPa, and the liquid space velocity is 15h -1 , the molar ratio of hydrogen to alkyne is 3.0, Table 3 is the composition of materials before and after the reaction.

[0088] Table 3 Composition of materials before and after reaction

[0089]

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Abstract

A method for recovering butadiene by selective hydrogenation of alkynes, using the C4 fraction rich in alkynes after extraction of butadiene as a raw material, in the presence of a catalyst, using an adiabatic reactor, selective hydrogenation to obtain 1,3 ‑Butadiene, the operating conditions of the process are as follows: the reaction inlet temperature is 20-60°C, the reaction pressure is 0.6-2.5MPa, and the liquid space velocity is 10-25h ‑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, the reduction of waste of resources and the improvement of economic benefits.

Description

technical field [0001] The invention relates to a method for recovering butadiene through selective hydrogenation of alkynes, in particular to a method for recovering butadiene through selective hydrogenation of residual high-alkyne carbon four tail gas after butadiene extraction. Background technique [0002] The cracked C4 fraction usually contains 40% to 60% butadiene by mass in the pyrolysis of hydrocarbons to produce ethylene. Butadiene is an important monomer in the synthetic rubber industry. The extraction of butadiene from the cracked C4 fraction usually adopts 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 use value at present, it can only be used for combustion treatment. However, because of the danger of explosion of high-concentration alkynes, it is recommended for safety reasons in industrial product...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C5/09C07C7/167C07C11/167B01J23/89
CPCC07C5/09C07C7/167B01J23/8993C07C2523/44C07C2523/28C07C2523/89C07C2523/755B01J35/613B01J35/635B01J35/633C07C11/167Y02P20/584
Inventor 郑云弟展学成王斌马好文胡晓丽钱颖孙利民李晓军柏介军潘曦竹王书峰蒋彩兰
Owner PETROCHINA CO LTD
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