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Method for recycling waste gas of butadiene extracting device

An extraction device, technology for butadiene, applied in chemical instruments and methods, purification/separation of hydrocarbons, hydrocarbons, etc., can solve the polymerization of dienes and alkynes, catalysts easily deactivated, reactor feeds, etc. problems, to achieve the effect of inhibiting deposition, maintaining catalytic performance, and enhancing flow rate

Active Publication Date: 2013-08-14
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0009] In order to solve the problem of easy deactivation of the catalyst caused by the high content of alkyne and diene in the raw material in the prior art, the polymerization problem of diene and alkyne in the reaction, and the problem of feeding the reactor, the present invention provides a new Utilization method of exhaust gas from butadiene extraction unit

Method used

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  • Method for recycling waste gas of butadiene extracting device

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Embodiment 1

[0049] 1. Boost: Exhaust gas 1 from the butadiene extraction unit (main composition: butene 0.26%, butadiene 60.15%, ethyl acetylene and vinyl acetylene 36.09%, carbon five 0.53%, water 0.02%, both is the mass percent content), the flow rate is 1318kg / h, the pressure is 0.1MPa (absolute pressure), and the waste gas enters the ejector 10 after passing through the buffer tank 9. Liquid phase carbon four 2 (main composition: butane 34.4%, butene 63.3%, butadiene 2.2%) come from the butadiene extraction device, flow rate 3545kg / h, pressure 0.9MPa (absolute pressure), enter injector 10 . After the waste gas 1 is mixed with the liquid-phase C42 through the injector 10, the outlet pressure of the injector is 0.6MPa (absolute pressure), the temperature is 58°C, and after cooling to 43°C, it becomes the liquid-phase mixed C43, in which the alkyne content is 10.6%;

[0050] 2. Reaction: After dehydration, the mixed C43 enters the mixing tank 12 and mixes with the circulating alkane 7 ...

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Abstract

The invention discloses a method for recycling waste gas of a butadiene extracting device, which comprises: (1) a step of boosting, which is to allow liquid-phase C4 with a relatively high pressure and the waste gas with a relatively low pressure to enter the injector, mix the waste gas and the liquid-phase C4 at the outlet of the injector to form a gas-liquid phase material flow, and cool the material flow to obtain the liquid-phase blended C4 material flow; and (2) a step of hydrogenization, which is to mix the blended C4 material flow obtained by the step (1) and circular alkane from hydrogenization products, boost with a booster pump, introduce hydrogen gas into the hydrogenization reactor, cool the products discharged from the outlet of the hydrogenization reactor to room temperature, and separate the products into two flows, wherein one flow serving as the circular alkane is introduced to the inlet of the hydrogenization reactor, and the other is used as the alkane product. The method can reduce the inactivation of catalyst in the hydronization process, saves energy and improves the comprehensive utilization rate of C4.

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): C07C9/10C07C5/08C07C7/167
Inventor 程建民刘智信廖丽华过良乐毅徐立英戴伟李东风
Owner CHINA PETROLEUM & CHEM CORP
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