Selective hydrogenation method for C4 fraction

A technology for selective hydrogenation and carbon four fractions. It is applied in the fields of hydrocarbons, chemical instruments and methods, and hydrogenation to hydrocarbons. It can solve the problems of small liquid space velocity and high circulation ratio of product circulation, so as to improve acid properties and improve Thermal stability, the effect of prolonging the service life

Active Publication Date: 2016-07-06
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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  • Selective hydrogenation method for C4 fraction
  • Selective hydrogenation method for C4 fraction
  • Selective hydrogenation method for C4 fraction

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] 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 first stage uses an isothermal bubbling bed reactor and catalyst 1, the reaction temperature is 50°C, and the molar ratio of hydrogen to alkyne is 1.5; the second stage uses an adiabatic bubbling bed reactor and catalyst 2, and the reaction inlet temperature is 40°C , the molar ratio of hydrogen to alkyne is 1.0; the reaction pressure of the first stage and the second stage are both 1.5MPa, and the liquid space velocity is 8h -1 ; Catalysts 1 and 2 were reduced at 120°C for 6h under a hydrogen atmosphere. Table 2 is the composition of materials before and after the reaction.

[0066] Material composition before and after table 2 reaction

[0067]

Embodiment 2

[0069] 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 first stage uses an isothermal bubbling bed reactor with a reaction temperature of 40°C and a molar ratio of hydrogen to alkyne of 1.0; the second stage uses an adiabatic bubbling bed reactor with a reaction inlet temperature of 30°C and The molar ratio is 1.0; the reaction pressure of the first stage and the second stage are both 1.5MPa, and the liquid space velocity is 10h -1 ; Catalyst 3 was used in both reactors, and catalyst 3 was reduced at 120°C for 6h under a hydrogen atmosphere. Table 3 is the composition of materials before and after the reaction.

[0070] Table 3 Composition of materials before and after reaction

[0071]

Embodiment 3

[0073] Dilute the alkyne-rich C4 fraction with raffinate C4, and the weight ratio of the alkyne-rich C4 fraction to the raffinate C4 is 1:2. The first stage uses an isothermal bubbling bed reactor and catalyst 4, the reaction temperature is 50°C, and the molar ratio of hydrogen to alkyne is 2.0; the second stage uses an adiabatic bubbling bed reactor and catalyst 5, and the reaction inlet temperature is 40°C , the molar ratio of hydrogen to alkyne is 1.5; the reaction pressure of the first stage and the second stage are both 2.0MPa, and the liquid space velocity is 12h -1 ; Catalyst 4 and Catalyst 5 were reduced at 120°C for 6h under a hydrogen atmosphere. Table 4 is the composition of materials before and after the reaction.

[0074] Material composition before and after table 4 reaction

[0075]

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Abstract

A selective hydrogenation method for a C4 fraction. A to-be-hydrogenated material and hydrogen are fed into a first-stage isothermal reactor. The material after the first-stage reaction then is fed into a second-stage adiabatic bed reactor. The reactors are both filled with selective hydrogenation catalysts. Reaction product is cooled and is separated in a gas-liquid separation tank. The selective hydrogenation catalysts in the first-stage isothermal reactor and the second-stage adiabatic bed reactor can be same or different, wherein at least one reactor is filled with the selective hydrogenation catalyst containing an alumina / niobium oxide composite carrier. The method has advantages of effectively recycling the C4 fraction being rich in alkyne from extraction of butadiene, reducing resource waste and improving economic benefit.

Description

technical field [0001] The invention relates to a method for producing butadiene by selective hydrogenation of carbon four fractions rich in alkynes discharged 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 production. Considering that when separating alkynes, an equal amount of butadiene should be dischar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/167C07C5/09C07C7/167B01J32/00B01J23/648B01J23/652B01J23/68
Inventor 钱颖潘曦竹郑云弟孙利民王宗宝马好文李晓艳胡晓丽王斌蒋彩兰吕龙刚王书峰林宏王涛梁顺琴
Owner PETROCHINA CO LTD
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