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Butadiene tail gas hydrogenation system and hydrogenation method

A hydrogenation system and butadiene technology, applied in chemical instruments and methods, hydrogenation to hydrocarbons, hydrocarbons, etc., can solve the problems of high alkyne content, safe operation, difficult liquefaction of butadiene tail gas raw materials, etc. Low alkyne content, high economic benefit, and the effect of improving the utilization rate of C4

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

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Problems solved by technology

[0008] In order to solve the operational safety problems caused by the difficult liquefaction of butadiene tail gas raw materials and the high content of alkynes in the prior art, the present invention provides a butadiene tail gas hydrogenation system and hydrogenation method
By adopting the method of absorption and desorption, the problems of liquefaction of gas phase materials and safety of device operation are solved.

Method used

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  • Butadiene tail gas hydrogenation system and hydrogenation method
  • Butadiene tail gas hydrogenation system and hydrogenation method
  • Butadiene tail gas hydrogenation system and hydrogenation method

Examples

Experimental program
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Effect test

Embodiment 1

[0056] Such as figure 1 As shown, a butadiene tail gas hydrogenation system includes: an absorption tower 8 , a booster pump 9 , a hydrogenation reactor 10 , and a desorption tower 11 . The bottom of the absorption tower 8 is provided with a butadiene tail gas inlet, and the bottom of the absorption tower 8 is connected to the booster pump 9, the hydrogenation reactor 10, and the desorption tower 11 in sequence. The top of the desorption tower 11 is provided with two pipelines to communicate with the outside world. The upper part of the absorption tower 8 is connected by a pipeline.

[0057] During the hydrogenation reaction,

[0058] 1. Absorption: butadiene tail gas 1 from butadiene extraction unit (main composition: butene 7.8%, butadiene 43.7%, ethyl acetylene and vinyl acetylene 46%, carbon five 0.53%, water 0.02% , are weight percentages), the flow rate is 1079kg / h, the pressure is 0.104MPa (absolute pressure, the same below), the tail gas enters the lower part of the ...

Embodiment 2

[0066] The material containing mixed xylene is used as the absorbent 2, and its main composition is: 21.1% o-xylene, 48.8% m-xylene, and 22.1% p-xylene.

[0067] 1. Absorption: The butadiene tail gas 1 from the butadiene extraction unit (composition, flow rate and pressure are the same as in Example 1), the tail gas enters the lower part of the absorption tower 8, and the absorbent 2 enters from the upper part of the tower. Absorbent 2 is mixed xylene (atmospheric boiling point 139°C), with a flow rate of 50,000kg / h and a pressure of 0.5MPa, and enters the top of the absorption tower. Butadiene tail gas 1 and absorbent 2 are contacted and absorbed in the absorption tower, the number of theoretical plates of the absorption tower is 2, the temperature at the top of the tower is 41°C, and the pressure at the top of the tower is 0.1MPa. There is no gas phase extraction at the top of the tower, and the content of ethylacetylene and vinyl acetylene in the liquid phase of the tower k...

Embodiment 3

[0075] When carrying out selective hydrogenation reaction,

[0076] 1. Absorption: butadiene tail gas from butadiene extraction unit (main composition: butene 7.8%, butadiene 43.7%, ethyl acetylene and vinyl acetylene 46%, carbon five 0.53%, water 0.02%, Both are weight percentages), the flow rate is 1079kg / h, the pressure is 0.104MPa (absolute pressure, the same below), the tail gas enters the lower part of the absorption tower, and the absorbent enters from the upper part of the tower. The absorbent is toluene, the flow rate is 20000kg / h, the pressure is 0.5MPa, and it enters the top of the absorption tower. The butadiene tail gas and the absorbent are contacted and absorbed in the absorption tower, the number of theoretical plates of the absorption tower is 3, the temperature at the top of the tower is 42°C, and the pressure at the top of the tower is 0.1MPa. There is no gas phase extraction at the top of the tower, and the content of ethylacetylene and vinyl acetylene in ...

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Abstract

The invention discloses a butadiene tail gas hydrogenation system and a hydrogenation method. The butadiene tail gas hydrogenation system comprises an absorption device, a pressurization device, a hydrogenation device and a desorption device. The bottom of the absorption device is connected to the pressurization device. The pressurization device is orderly connected to the hydrogenation device and the desorption device. The bottom of the desorption device is connected to the upper part of the absorption device. The hydrogenation method comprises butadiene tail gas absorption, butadiene tail gas pressurization and hydrogenation reaction. Through absorption and desorption, the butadiene tail gas hydrogenation system and the hydrogenation method realize gas phase material liquefaction and device operation safety and have the advantages of simple process, less devices, less investment and low energy consumption.

Description

technical field [0001] The invention relates to the field of petrochemical industry, in particular to a butadiene tail gas hydrogenation system and a hydrogenation method. Background technique [0002] The 1,3-butadiene in cracking C4 hydrocarbons is usually refined by two-stage solvent extraction rectification and then direct rectification. The residual waste gas produced by this refining device is commonly known as butadiene tail gas. Extractive distillation is also called extraction, and the recovery device of butadiene is generally called butadiene extraction device. 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. Because high-concentration alkynes are easy to polymerize and explode, they must be diluted with raffinate containing butane and butene before...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C9/10C07C5/03C07C5/08C07C11/167C07C7/11C07C7/167
Inventor 李东风戴伟程建民廖丽华乐毅刘智信李琰过良王婧
Owner CHINA PETROLEUM & CHEM CORP
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