System and process for recovering ethylene from industrial tail gas
A technology for industrial tail gas and ethylene, applied in gas treatment, hydrocarbon purification/separation, separation methods, etc., can solve problems such as difficult to efficiently and fully recover ethylene
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Embodiment 1
[0032] The system for recovering ethylene from industrial tail gas includes a pretreatment unit and a condensation separation unit. Such as figure 1 As shown, the pretreatment unit includes a fourth gas-liquid separation tank 1 , a water washing tower 2 , a gas cabinet 3 , a liquid ring press 4 , an alkali washing tower 5 , a water cooler 6 and a drying tower 7 . The condensation separation unit includes a heat exchange part, a gas-liquid separation part and a cooling source supply part. The heat exchange section includes a first heat exchanger 8 and a second heat exchanger 9, the gas-liquid separation section includes a first gas-liquid separation tank 10 and a second gas-liquid separation tank 11, and the cold source supply section includes a liquid nitrogen storage system 12 and Nitrogen recovery system13.
[0033] The connections between the above devices are as follows:
[0034] The top of the fourth gas-liquid separation tank 1 is provided with a first material outlet...
Embodiment 2
[0049] This embodiment is basically the same as Embodiment 1, the difference is that, as figure 2 As shown, the water cooler 6 is not provided in this program, and the condensation method is used to remove water and other substances in the mixed gas. In this solution, a third gas-liquid separation tank 15 and a third heat exchanger 16 are provided, both of which are conventional equipment in the prior art. The inlet end of the heat medium channel of the third heat exchanger 16 is the twelfth material inlet, and the outlet end is the twelfth material outlet. The inlet end of the refrigerant channel of the third heat exchanger 16 is the third refrigerant inlet, and the outlet end is the third refrigerant outlet. The inlet end of the third gas-liquid separation tank 15 is the thirteenth material inlet, and the outlet end is the thirteenth material outlet. The twelfth material inlet of the third heat exchanger 16 is communicated with the fifth material outlet of the alkali wash...
Embodiment 3
[0055] This embodiment 1 is basically the same as embodiment 1, the difference is that the initial tail gas produced in different working conditions is used, and the initial tail gas is obtained by degassing ethylene in the degassing tank. In this embodiment, the composition of the initial tail gas is specifically (Mole percent): oxygen 0.2%, ethane 0.24%, nitrogen 1.59%, carbon dioxide 1.44%, vinyl acetate 0.34%, methane 0.04%, ethylene 85.84%, acetaldehyde 0.39%, methanol 0.48%, water 0.22%, the rest is A small amount of ethyl acetate, tert-butanol, hydrogen peroxide, tert-butyl hydroperoxide and vinyl acetate-ethylene copolymer (a copolymer dispersed in exhaust gas). After recycling in this process, gaseous ethylene with a purity of over 99.5% can be obtained.
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