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Hydrogenation method of butadiene extraction tail gas

A technology for butadiene and two-stage hydrogenation, which is applied in the fields of hydrogenation to hydrocarbons, organic chemistry, isomerization to hydrocarbons, etc., can solve the problem of no recycling and other problems, and achieve the effects of increasing production and significant economic benefits.

Inactive Publication Date: 2016-05-18
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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  • Claims
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Problems solved by technology

[0006] In order to fully recycle butadiene tail gas and overcome the problem of no recycling of isobutene, cis and trans-butene-2 ​​in the prior art, the invention provides a hydrogenation method for butadiene extraction tail gas

Method used

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  • Hydrogenation method of butadiene extraction tail gas

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Embodiment 1

[0032] The liquefied butadiene tail gas 1 from the butadiene extraction unit, at a temperature of 30°C and a flow rate of 1000kg / h, is mixed with the 50000kg / h liquid phase 9 and 45kg / h hydrogen gas 2 from the first-stage outlet separation tank, and is sent from the first-stage reactor The upper part of 3 enters. The inlet conditions of the first-stage reactor are: temperature 40°C, pressure 2.0MPa, hydrogen / (alkyne + diene) molar ratio 1.5:1, the first-stage reaction product 4 enters the cooler 5, and enters the first-stage outlet separation tank 6 after cooling with water. Part of the liquid phase is boosted by the circulation pump 8 and mixed with the butadiene tail gas 1, and the other liquid phase material 10 enters the second-stage reactor 13, and the flow rate of the second-stage hydrogen gas 11 is 1 kg / h. The inlet conditions of the second-stage reactor 13 are: temperature 40°C, pressure 1.8MPa, hydrogen / (alkyne + diene) molar ratio 4:1, the second-stage reaction produ...

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Abstract

The invention provides a hydrogenation method of butadiene extraction tail gas. A selective hydrogenation reaction is carried out to tail gas, which is rich in alkynes, from a butadiene extraction apparatus in a first-stage hydrogenation reactor and a second-stage hydrogenation reactor to completely convert vinyl acetylene, ethyl acetylene and butadiene into 1-butene through hydrogenation. A reaction product then is fed into a product separation column to obtain a product being rich in 1-butene and isobutene at the top of the column, wherein the product is suitable for being used as a raw material in a MTBE / 1-butene apparatus. The material in the bottom of the column then passes through an isomerization reactor to convert n-butene into isobutene which is then circulated into the product separation column. The method can fully recycle valuable substances in the butadiene extraction tail gas and has significant economic benefit.

Description

technical field [0001] The invention relates to the field of petrochemical industry, in particular to a method for recovering and utilizing tail gas rich in alkynes produced by a butadiene extraction device. Background technique [0002] The 1,3-butadiene in the cracked C4 fraction is generally refined by two-stage solvent extraction rectification and ordinary rectification. This device produces butadiene tail gas rich in alkynes. The alkyne concentration in the butadiene tail gas is relatively high, generally greater than 20% by weight, and the highest can exceed 40% by weight. These alkyne-rich waste gases have no industrial value at present and can only be sent to torch for combustion. Since high-concentration alkynes are easy to polymerize and explode, the raffinate containing butane and butene is generally used for dilution and then sent to a torch for combustion, which causes a great waste of resources. With the deepening of steam cracking of hydrocarbons in recent y...

Claims

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Application Information

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IPC IPC(8): C07C11/09C07C5/27C07C11/08C07C5/05C07C5/09C07C5/08
Inventor 廖丽华李东风李琰李春芳程建民罗淑娟过良王婧
Owner CHINA PETROLEUM & CHEM CORP
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