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A kind of method of alkyne selective hydrogenation recovery butadiene

A technology for selective hydrogenation and butadiene, applied in chemical instruments and methods, hydrogenation hydrocarbon production, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of high product circulation ratio and small liquid space velocity and other problems to achieve the effect of increasing production, improving acid properties and avoiding adverse factors

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 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
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 isothermal reactor adopts a single-stage isothermal 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 isothermal reactor adopts a single-stage isothermal bubbling bed, and uses 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] The C4 fraction rich in alkynes is diluted with the C4 raffinate, the weight ratio of the C4 fraction rich in alkynes to the C4 raffinate is 1:3, and the isothermal reactor adopts a single-stage isothermal 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 of recycling butadiene through selective hydrogenation of alkynes includes the steps of: with a C4 fraction being rich in the alkynes from extraction of butadiene as a raw material, performing selective hydrogenation in the presence of a catalyst in an isothermal reactor to prepare 1,3-butadiene, wherein operation conditions of the process include: reaction temperature is 30-80 DEG C, reaction pressure is 1.0-3.0 MPa, liquid space velocity is 7-18 / h, and the catalyst is a Pd / Pb catalyst with a niobium oxide / alumina carrier. The method has advantages of effectively utilizing the C4 fraction being rich in the the alkynes from extraction of the butadiene, reducing resource waste and improving economic benefit.

Description

technical field [0001] The invention relates to a method for recovering butadiene through selective hydrogenation of highly unsaturated hydrocarbons in C4 fractions. 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, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/167C07C5/09B01J23/648B01J23/652B01J23/68
Inventor 郑云弟钱颖马好文王斌王宗宝胡晓丽孙利民李晓艳潘曦竹梁顺琴张忠东吕龙刚王涛郭珺
Owner PETROCHINA CO LTD
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