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A kind of method of alkyne selective hydrogenation

A selective and alkyne-based technology, applied in chemical instruments and methods, purification/separation of hydrocarbons, hydrogenation to hydrocarbons, etc., can solve the problems of high product circulation ratio, low liquid space velocity, etc., to improve thermal stability , Improve the acid properties, increase the output effect

Active Publication Date: 2018-07-13
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the liquid space velocity of this process is small, the product circulation rate is relatively high compared with the fresh material circulation, and a heat exchanger is installed between each section of the multi-section fixed-bed reactor.

Method used

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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] 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 1:2.5. The adiabatic reactor adopts a single-stage adiabatic bubbling bed, and uses catalyst 1, and the catalyst is reduced at 120°C for 6 hours under a hydrogen atmosphere. Reaction temperature 50℃, reaction pressure 1.2MPa, liquid space velocity 8.5h -1 , the molar ratio of hydrogen to alkyne is 1.5, Table 2 is the composition of materials before and after the reaction.

[0063] Table 2 Composition of materials before and after reaction

[0064]

Embodiment 2

[0066] 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 1:3. The adiabatic reactor adopts a single-stage adiabatic bubbling bed, adopts catalyst 2, and the catalyst is reduced at 120°C for 6 hours under a hydrogen atmosphere. The reaction temperature is 45°C, the reaction pressure is 1.5MPa, and the liquid space velocity is 9.0h -1 , the molar ratio of hydrogen to alkyne is 1.5, Table 3 is the composition of materials before and after the reaction.

[0067] Table 3 Composition of materials before and after reaction

[0068]

Embodiment 3

[0070] Dilute the alkyne-rich C4 fraction with the raffinate C4, the weight ratio of the alkyne-rich C4 fraction to the raffinate C4 is 1:3, and the adiabatic reactor adopts a single-stage adiabatic bubbling bed, Catalyst 3 was used, and the catalyst was reduced at 120° C. for 6 h under hydrogen atmosphere. The reaction temperature is 45°C, the reaction pressure is 2.0MPa, and the liquid space velocity is 10.0h -1 , the molar ratio of hydrogen to alkyne is 2.0, Table 4 is the composition of materials before and after the reaction.

[0071] Table 4 Composition of materials before and after reaction

[0072]

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Abstract

A method for the selective hydrogenation of alkynes, using the C4 fraction rich in alkynes after the extraction of butadiene as a raw material, in the presence of a catalyst, using an adiabatic reactor to selectively hydrogenate to obtain 1,3-butane Alkene, the operating conditions of the process are as follows: the reaction inlet temperature is 20-60°C, the reaction pressure is 1.0-3.0MPa, and the liquid space velocity is 8-20h-1. The catalyst is a palladium-lead catalyst supported on niobium oxide-alumina. 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 present invention relates to a process for the selective hydrogenation of highly unsaturated hydrocarbons. 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 production. Considering that when separating alkynes, an equal amount of butadiene should be discharged at the same time, and it needs to be diluted with ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C5/09C07C7/167C07C11/167B01J23/648
Inventor 钱颖郑云弟胡晓丽王宗宝王斌马好文潘曦竹孙利民蒋彩兰梁顺琴王书峰黄德华王涛蔡小霞王玲玲
Owner PETROCHINA CO LTD
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