System and method for recovering ethylene from high propylene light hydrocarbons or methanol-to-propylene product gas
A technology for producing propylene and high propylene light hydrocarbons from methanol is applied in ethylene production, hydrocarbon purification/separation, chemical instruments and methods, etc. Operational performance, the effect of improving utilization
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[0078] Examples:
[0079] Such as figure 1 Shown is a system for recovering ethylene from high propylene light hydrocarbons or methanol to propylene product gas.
[0080] Including: first deethanizer 1, depropanizer 15, dryer 2, hydrogenation reactor 3, demethanizer 5, demethanizer tail gas recovery unit, second deethanizer 13, and ethylene rectification tower 14 ;
[0081] The tail gas recovery unit consists of a combined absorption tower 7, an expander 11 and a second gas-liquid separation tank 10. The upper part of the combined absorption tower 7 is a cryogenic rectification tower section 9, and the lower part is an absorption tower section 8.
[0082] The top of the first deethanizer 1 is connected to the dryer 2 and then to the hydrogenation reactor 3, the lower part of the hydrogenation reactor 3 is connected to a gas-liquid separation tank 4, and the gas-liquid separation tank 4 is connected to the demethanizer 5;
[0083] The bottom pipeline of the first deethanizer 1 is divid...
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