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Utilization method of waste gas discharged from butadiene extracting apparatus

An extraction device and butadiene technology, which is applied in the field of utilization of alkyne-rich waste gas from a butadiene extraction device, can solve problems such as difficulty in utilizing butadiene tail gas, and achieve equipment investment savings, high economic benefits, and improved safe effect

Active Publication Date: 2014-03-12
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0008] In order to solve the problems existing in the prior art that butadiene tail gas is difficult to liquefy and increase pressure, the present invention provides a method for utilizing waste gas from a butadiene extraction device, which solves the problem of Difficult utilization of butadiene tail gas

Method used

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  • Utilization method of waste gas discharged from butadiene extracting apparatus

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Embodiment 1

[0040] 1. Boost: Exhaust gas 1 from the butadiene extraction unit (main composition: 7.82% butene, 43.76% butadiene, 47.1% ethyl acetylene and vinyl acetylene, both in mass percentage), flow rate 1080kg / h, pressure 0.1MPa (absolute pressure, the same below). The exhaust gas enters a section of the compressor 11, the pressure of the exhaust gas stream 2 at the outlet of the compressor is 0.17MPa, and the temperature is 64.3°C. The exhaust gas enters the cold box for heat exchange and turns into a liquid phase. 5.1°C;

[0041] 2. Reaction: The liquid phase C43 enters the mixing tank after being dehydrated, and mixes with the recycle stream 7 from the hydrogenation product. The flow rate of the recycle stream is 8640kg / h. After boosting the pressure by the booster pump, a certain amount of hydrogen is added 5. Enter the reactor 13 to react. The reaction conditions are: temperature 40°C, pressure 2.0MPa, hydrogen / alkyne molar ratio 1.5, liquid volume space velocity 15h -1, a c...

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Abstract

The invention discloses a utilization method of waste gas discharged from a butadiene extracting apparatus. According to the method, waste gas is subject to a reaction with hydrogen; alkyne in the waste gas is subject to a selective hydrogenation reaction, such that diolefins is produced; the reaction product is delivered back to the butadiene extracting apparatus, and 1,3-butadiene can be recovered. According to the invention, a compressor technology and a cold box technology are adopted, such that a problem of butadiene tail gas utilization difficulty is solved.

Description

technical field [0001] The invention relates to the field of recovery and utilization of petrochemical waste gas, in particular to a method for utilizing waste gas rich in alkynes of a butadiene extraction device. Background technique [0002] When the ethylene cracking unit co-produces C4 hydrocarbons, the 1,3-butadiene in the cracked 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 exhaust. Extractive distillation is also called extraction, and the recovery device of butadiene is generally called butadiene extraction device. 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. Because high-concentration alkynes are e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/167C07C5/09C07C7/10F25J1/00
Inventor 李东风张勇戴伟程建民廖丽华刘智信过良李琰李晓峰罗淑娟
Owner CHINA PETROLEUM & CHEM CORP
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