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Propylene gas catalytic deoxygenation device and method with temperature and tail oxygen concentration control

A technology of gas catalysis and propylene, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve problems such as fluctuations in oxygen content, excessive tail oxygen content, and overheating of catalytic beds

Active Publication Date: 2022-03-04
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of propylene gas catalytic deoxygenation device and method with temperature, tail oxygen concentration control, needn't add H 2 Reducing gases such as propylene and oxygen react directly to produce CO 2 and H 2 O, to achieve the purpose of propylene tail gas deoxygenation, and the reaction device is safe, environmentally friendly, and energy-saving, and it is especially suitable for solving the catalytic bed overheating and tail oxygen content exceeding the standard that may be caused by the fluctuation of oxygen content and the decline of catalyst activity in the process of olefin deoxygenation And other issues

Method used

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  • Propylene gas catalytic deoxygenation device and method with temperature and tail oxygen concentration control

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Effect test

Embodiment 1

[0044] Composition of propylene tail gas: the concentration of oxygen by volume is 5%, the concentration of propylene by volume is 90%, and the concentration of nitrogen is 5%. Reaction pressure 1MPa, reaction space velocity 10000hr -1 . The propylene tail gas is at 40°C, and after the heat is exchanged to 80°C by the heat exchanger, it enters the deoxygenation reactor, and the outlet temperature of the reaction bed is 280°C. The gas after the deoxygenation reaction exchanges heat with the raw material gas to 80°C, and after being cooled to 20°C by the air condenser, it enters the gas-liquid separation tank to separate the liquid phase generated during the reaction. The gas phase oxygen content is 0.1%, and the gas phase oxygen content gradually increases to 0.17% during operation. After the reaction inlet temperature is increased to 130°C, the gas phase oxygen content will drop to 0.14%, and the operation is maintained under this operating condition.

Embodiment 2

[0046] Composition of propylene tail gas: the concentration of oxygen by volume is 3.5%, the concentration of propylene by volume is 90%, and the concentration of nitrogen is 6.5%. Reaction pressure 3MPa, reaction space velocity 30000hr -1 . The propylene tail gas is at 40°C, and after the heat is exchanged to 380°C by the heat exchanger, it enters the deoxygenation reactor, and the outlet temperature of the reaction bed is 535°C. The gas after the deoxygenation reaction exchanges heat with the raw material gas to 120°C, and after being cooled to 20°C by the air 4 condenser, it enters the gas-liquid separation tank to separate the liquid phase generated during the reaction. The gas phase oxygen content is 0.18%, the reaction inlet temperature is increased to 390°C, the reaction bed outlet temperature is raised to 545°C, and the gas phase oxygen content is reduced to 0.16%; the reaction inlet temperature is further increased to 400°C, and the reaction bed outlet temperature is...

Embodiment 3

[0048] Composition of propylene tail gas: oxygen volume percentage concentration is 4.6%, propylene volume percentage concentration is 90%, nitrogen gas 5.4%. Reaction pressure 3MPa, reaction space velocity 30000hr -1 . The propylene tail gas is at 40°C, and after the heat is exchanged to 385°C by the heat exchanger, it enters the deoxygenation reactor, and the outlet temperature of the reaction bed is 595°C. The gas after the deoxidation reaction exchanges heat with the raw material gas to 130°C, and after being cooled to 20°C by the air condenser, it enters the gas-liquid separation tank to separate the liquid phase generated during the reaction. The oxygen content of the gas phase is 0.11%. At this time, the reactor The outlet temperature control is started, the reflux regulating valve is opened, and 40% of the gas reflux is controlled. The reactor outlet temperature will be 520°C, and the gas phase oxygen content will be 0.19%; adjust the reaction temperature to 540°C, an...

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Abstract

The invention discloses a propylene gas catalytic deoxidation device and method with temperature and tail oxygen concentration control, and relates to the technical field of chemical tail gas treatment. After the raw material propylene tail gas is heat-exchanged by the heat exchanger, it is further heated by the electric heater to the reaction operating temperature, and then enters the deoxidation reactor. The deoxidation reactor is equipped with a catalyst bed. The air condenser cools down and enters the gas-liquid separation tank to separate the liquid phase generated during the reaction. The gas phase enters the non-condensable gas separation tower after being boosted by the compressor, and the non-condensable gas is separated from the gas phase, and pure propylene is obtained from the liquid phase; in the fourth The outlet pipeline is equipped with a tail oxygen analyzer, which can detect the tail oxygen content. If it is higher than the normal value, it will be refluxed through the fourth outlet branch pipeline. The invention is especially suitable for process treatment such as bed overheating, tail oxygen content exceeding standard and the like which may be caused by oxygen content fluctuation, catalyst activity decline and other reasons in the olefin deoxygenation process.

Description

technical field [0001] The invention relates to the technical field of chemical tail gas treatment, in particular to a propylene gas catalytic deoxidation device and method with temperature and tail oxygen concentration control. Background technique [0002] Oxygen-containing organic hydrocarbon gas or tail gas is a common gas in the current chemical production, storage and transportation process, such as organic tail gas in the oxidation and peroxidation process, tail gas from the tank farm communication system, landfill gas, etc., often due to high oxygen content And it brings the risk of explosion; and SH 3009-2013 "Petrochemical Combustible Gas Emission System Design Code" 5.3.1 stipulates that "combustible gases with oxygen content greater than 2% (v%)" should not be discharged into the whole plant Combustible gas discharge systems, such as flares, incinerators, etc. Therefore, in order to reduce the risk of explosion, recycle organic gas or ensure that the oxygen-cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/86B01D53/46C07C7/00C07C11/06
CPCB01D53/8671B01D53/346C07C7/005B01D2257/104B01D2258/02B01D2256/24B01D2255/1021B01D2255/1023B01D2255/1025B01D2255/1026B01D2255/104B01D2255/1028B01D2255/2092B01D2255/20707B01D2255/50B01D2255/70B01D2255/702C07C11/06
Inventor 姜杰文松赵磊孙冰石宁
Owner CHINA PETROLEUM & CHEM CORP
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