Propylene gas catalytic deoxidation device and method

Abstract

The invention discloses a propylene gas catalytic deoxidation device and method. The device comprises a heat exchanger, an electric heater, a deoxidation reactor, an air condenser, a gas-liquid separation tank, a compressor and a separation tower; raw propylene tail gas exchanges heat through the heat exchanger, and is further heated to reaction operating temperature through the electric heater, and enters the deoxidation reactor; the deoxidation reactor is internally provided with a catalyst bed, and deoxidized gas enters the gas-liquid separation tank through the air condenser after heat exchange with the raw gas; liquid phases generated in the reaction process are separated, and gas phases enter a non-condensable gas separation tower after being pressurized through the compressor; and non-condensable gas is separated from the gas phases, and pure propylene is obtained from the liquid phases. According to the propylene gas catalytic deoxidation device and method, the propylene directly reacts with oxygen for generating CO2 and H2O; and carbon deposition and generation of byproduct CO on catalyst surfaces can be inhibited, and the device has higher bearing capacity for fluctuationof the oxygen content of the raw gas.

Description

technical field [0001] The invention relates to the technical field of chemical tail gas treatment, in particular to a propylene gas catalytic deoxidation reaction device and a deoxidation method. 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-containing organic tail gas meets th...

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Problems solved by technology

[0003] The deoxygenation technologies in the prior art mainly include pressure swing adsorption deoxidation, chemical adsorption deoxidation, activated carbon combustion deoxygenation, and catalytic combustion deoxidation. Among them, physical and chemical adsorption deoxidation has a small load and is suitable for the removal of trace oxygen. high consumption

The catalytic deoxygenation technology in the prior art basically needs to add H 2 and other reducing gases, and the separation of reducing gases has become a more difficult problem to solve

[0004] The organic gas catalytic oxidation deoxygenation technology in the current prior art is mainly aimed at methane-containing gases such as coalbed methane and landfill gas, and the deoxygenation technology for olefins such as ethylene and propylene is only suitable for the removal of trace oxygen at the ppm level, and no one for ethylene Catalytic deoxygenation technology for olefins such as propylene and propylene, but olefins are prone to carbon deposition on the surface of the catalyst at a certain temperature, and its deoxygenation technology is somewhat different from methane deoxygenation technology

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