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A kind of method for hydrogenation of tail gas of dmf method butadiene extraction device

An extraction device and technology for butadiene, which are applied in chemical instruments and methods, hydrogenation to hydrocarbons, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as easy polymerization and explosion, and achieve a long operating cycle. , The process is simple, and the effect of ensuring combustion safety

Active Publication Date: 2021-08-20
SINOPEC YANGZI PETROCHEM +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] This method solves the problem of safe operation of the DMF method butadiene extraction device, and solves the problem of easy polymerization and explosion of butadiene tail gas liquefaction boost

Method used

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  • A kind of method for hydrogenation of tail gas of dmf method butadiene extraction device
  • A kind of method for hydrogenation of tail gas of dmf method butadiene extraction device

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Embodiment

[0038] Dissolved with C 4 The DMF solvent 1 of alkyne enters the middle part of the second stripping tower 101, the total mass flow of DMF solvent 1 is 40000kg / h, and the pressure is 0.2MPaG, and the temperature is 140 ℃, wherein C 4 The mass flow rate of VA (vinyl acetylene) is 440.75kg / h, the mass flow rate of VA (vinyl acetylene) is 231.91kg / h, and the content of VA is 0.58wt%; The theoretical plate number that the second stripper 101 adopts is 10, and the pressure is 0.01 MPaG, the temperature of the tower bottom is 163.4°C. The hydrogenated product C48 from the butadiene tail gas hydrogenation unit enters the top of the second stripper 101 as a diluent, and the mass flow rate of the hydrogenated product C48 used for dilution is 850kg / h, and the hydrogenated product C48 The ratio of the mass flow rate of to the mass flow rate of vinyl acetylene in DMF solvent 1 containing C4 alkyne is 3.67. Dissolved with C 4 The DMF solvent 1 of alkynes comes from the tower still of th...

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Abstract

The invention provides a method for hydrogenating tail gas of a DMF method butadiene extraction device. In this method, hydrogenation product C4 is introduced to the top of the second stripping tower as a diluent, and the mixed gas is condensed and liquefied to boost pressure and then react with hydrogen. Catalyst composed of metallic nickel, under the hydrogenation method of C4 liquid phase circulation and hydrogen gas phase circulation, in the gas-liquid two-phase reaction conditions, most of the alkynes and olefins in the butadiene tail gas are converted into alkanes. The method has short process flow, safe and reliable operation, no need for regeneration of the nickelizing agent, long operation period, and reduces the loss of raffinate, and the content of olefins in C4 in the hydrogenation product is less than 5%, which meets the requirements of being used as a cracking raw material for an ethylene unit.

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 cracking C4 hydrocarbons is generally 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 butadiene recovery unit is also called butadiene extraction unit. The main production methods are DMF method, acetonitrile method and NMP method. The concentration of alkynes in butadiene tail gas is relatively high, generally greater than 20wt%, and the highest can exceed 40wt%. These alkyne-rich waste gases have no industrial utilization value at present and can only be sent to torch for combustion. [0003] In the production of 1,3-butadiene by DMF cr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C5/03C07C5/08C07C7/04C07C11/22C07C9/10B01J23/755
CPCB01J23/755C07C5/03C07C5/08C07C7/04C07C9/10C07C11/22
Inventor 许岩峰廖丽华李琰
Owner SINOPEC YANGZI PETROCHEM
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