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A butadiene tail gas hydrogenation device and method

A technology for hydrogenation unit and butadiene, which is applied in the fields of hydrogenation to hydrocarbons, organic chemistry, etc., can solve the problems of short operating cycle of the reactor, high olefin content, frequent catalyst regeneration, etc. The effect of high content and good economic benefits

Active Publication Date: 2015-08-19
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to solve the problems existing in the prior art, such as high olefin content in the product, short reactor operation period, and frequent regeneration of the catalyst, the present invention provides a butadiene tail gas hydrogenation method

Method used

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  • A butadiene tail gas hydrogenation device and method

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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 1300kg / h n-butane 23 from the second-stage outlet separation tank, and then boosted by the feed pump 2 To 2.8MPaG, mixed with the circulating material 9 from the first-stage outlet separation tank, and then enters from the upper part of the first-stage reactor 4. The flow rate of the circulating material 9 is 24000kg / h, the pressure is 2.9MPa, and the temperature is 40°C. The hydrogen gas 3 has a pressure of 3.0 MPaG and a flow rate of 100 kg / h, and enters from the top of the first-stage reactor 4 . The inlet conditions of the first-stage reactor are: temperature 40°C, pressure 2.8MPa, hydrogen / (alkyne + diene) molar ratio 2.4, liquid volume space velocity 5h -1 The first-stage reaction product 5 enters the first-stage outlet separation tank 6, and a part of the liquid phase is boosted by the circulation pump 7, cooled by the cir...

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Abstract

The invention provides a method for hydrogenation of alkyne-rich tail gas of a butadiene extraction device. The alkyne-rich tail gas of a butadiene extraction device undergoes a liquid-phase hydrogenation reaction in the presence of an Ni-based catalyst using a titanium oxide-alumina compound as a carrier and undergoes a gas-phase hydrogenation reaction in the presence of an Ni-MO-based catalyst so that all alkynes and dialkenes in the raw material are subjected to hydrogenation conversion and most olefins are hydrogenated to form alkanes. The method realizes continuous and stable operation of the device and obviously reduces olefin content of the hydrogenation products to less than 5% so that requirements on cracking of the raw material of an ethylene production device are satisfied.

Description

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

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C9/10C07C5/03C07C5/08
Inventor 廖丽华李琰李东风柴忠义程建民过良刘智信王婧罗淑娟王宇飞康锴
Owner CHINA PETROLEUM & CHEM CORP
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