Method for hydrotreating butadiene tail gas

A technology for butadiene and two-stage hydrogenation, which is applied in the fields of chemical instruments and methods, hydrogenation of hydrocarbons, hydrocarbons, etc., can solve the problem of large impact, large loss of 1,3-butadiene, and 1-butene production Not advanced question

Active Publication Date: 2014-05-14
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In order to fully recover and utilize butadiene tail gas, overcome the problems in the prior art that the high concentration of EA in the recovery of 1,3-butadiene has a great impact on the butadiene extraction system or the loss of 1,3-butadiene is relatively large , and 1-butene production is not high, the invention provides a butadiene tail gas hydrogenation method

Method used

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  • Method for hydrotreating butadiene tail gas
  • Method for hydrotreating butadiene tail gas
  • Method for hydrotreating butadiene tail gas

Examples

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Embodiment 1

[0035] 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 20000kg / h liquid phase 9 and 22kg / h hydrogen gas 2 from the second-stage outlet separation tank, and is reacted from the first stage The upper part of device 3 enters. The inlet conditions of the first-stage reactor are: temperature 40°C, pressure 1.5MPa, hydrogen / vinyl acetylene molar ratio 1.03:1 (the molar ratio of hydrogen in hydrogen 2 to vinyl acetylene in butadiene tail gas 1), the first-stage reaction product 4 Enter the cooler 5, cool with water and enter the first section of the outlet separation tank 6, a part of the liquid phase is boosted by the circulation pump 8 and mixed with the butadiene tail gas 1, and the other part of the liquid phase material 10 enters the middle of the butadiene recovery tower, and the top of the tank The non-condensable gas 7 discharge device. In the butadiene recovery tower 11, the gas p...

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Abstract

The invention provides a method for hydrotreating alkynes-rich butadiene tail gas. The method comprises the following steps: extracting butadiene tail gas, a selective hydrogenation is carried out in a one-section hydrogenation reactor, vinylacetylene is performed with hydro-conversion to 1,3-butadiene; the one-section hydrogenation reaction products are seperared, a part which is rich in 1,3-butadiene is sent to a butadiene extraction device, other part is performed with the selective hydrogenation reaction through a second-section hydrogenation reactor, alkynes and dialkene are performed with hydro-conversion to 1-butylene, two hydrogenation reaction products are sent to a recovery device of 1-butylene. The method is capable of fully recovering the valuable substances in the butadiene tail gas, and the economic benefit is obvious.

Description

technical field [0001] The invention relates to the field of petrochemical industry, in particular to a method for hydrogenation of 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 concentration of alkynes 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 years...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/167C07C11/08C07C5/05C07C5/09C07C7/167
Inventor 廖丽华李琰李东风程建民刘智信过良王婧罗淑娟王宇飞康锴
Owner CHINA PETROLEUM & CHEM CORP
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