Separation method of ethylene cracking gas through full temperature range-pressure swing adsorption
A technology of pressure swing adsorption and ethylene cracking, which is applied in the fields of adsorption purification/separation, distillation purification/separation, organic chemistry, etc., which can solve the problems that huge energy cannot be effectively used, and achieve little temperature change, high separation efficiency, and low energy consumption. low effect
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Embodiment 1
[0037] Such as figure 1 As shown, a separation method of ethylene cracking gas full temperature range pressure swing adsorption (FTrPSA), the following operations are performed in sequence:
[0038] 1) Pretreatment process:
[0039] The ethylene cracking gas raw material gas produced from the ethylene cracking furnace with a temperature of 700~900°C goes through a pretreatment process consisting of initial cooling of heavy oil and heavy hydrocarbons, pressurization, alkali washing, and drying, and the temperature is lowered to 70 ~100℃, the pressure is 3.0~4.0MPa, enter the next step of medium and high temperature pressure swing adsorption concentration process;
[0040] In this process, in addition to drying and lowering the temperature, unreacted naphtha, water, and heavy by-products generated by steam cracking reactions contained in the ethylene cracking gas must be condensed and dried.
[0041] 2) Medium and high temperature pressure swing adsorption concentration proces...
Embodiment 2
[0055] Such as figure 1 As shown, a separation method of ethylene cracking gas full temperature range pressure swing adsorption (FTrPSA), the following operations are performed in sequence:
[0056] The ethylene cracking gas raw material gas produced from the ethylene cracking furnace with a temperature of 700~900 °C goes through a pretreatment process consisting of initial cooling of heavy oil and heavy hydrocarbons, pressurization, alkali washing, and drying, and the temperature is lowered to 120 ~150°C, pressure 2.0~3.0MPa, enter the medium-high temperature pressure swing adsorption concentration process, adopt 10 adsorption towers in series, 3 towers are always adsorbing, and the remaining 7 towers are in the desorption regeneration step, alternate cycle operation, the operating temperature is 120~150℃, operating pressure 2.0~3.0MPa, normal pressure or vacuum desorption, the concentrated gas rich in ethylene and propylene flowing out from the bottom of the tower, after pre...
Embodiment 3
[0058] Such as figure 1 As shown, a separation method of ethylene cracking gas full temperature range pressure swing adsorption (FTrPSA), the following operations are performed in sequence:
[0059] The ethylene cracking gas raw material gas produced from the ethylene cracking furnace with a temperature of 700~900°C goes through a pretreatment process consisting of initial cooling of heavy oil and heavy hydrocarbons, pressurization, alkali washing, and drying, and the temperature drops to 170 ~200℃, the pressure is 0.03~1.0MPa, enters the middle and high temperature pressure swing adsorption concentration process, adopts 10 adsorption towers in series, 3 towers are always adsorbing, and the remaining 7 towers are in the desorption regeneration step, alternate cycle operation, the operating temperature is 170~200℃, operating pressure 0.03~1.0MPa, normal pressure or vacuum desorption, the concentrated gas rich in ethylene and propylene flowing out from the bottom of the tower, a...
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