Method for absorbing and separating light hydrocarbon from dry gas or industrial tail gas
A technology of industrial tail gas and dry gas, which is applied in the direction of separation methods, dispersed particle separation, chemical instruments and methods, etc., can solve the problems of high energy consumption, difficult recovery and recycling, environmental and product pollution and other problems of cryogenic separation methods, and achieve suitable The effect of industrial production, high light hydrocarbon separation selectivity, and high-efficiency removal
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Embodiment 1
[0041] The absorbent is a deep eutectic solvent mixed with n-decanoic acid and tetrabutylammonium chloride at a molar ratio of 2:1. Refinery dry gas composition (molar ratio): methane 21.8%, ethane 20%, ethylene 17.1%, propane 2.6%, propylene 5.4%, hydrogen 1.6%, nitrogen 22.4% and other components above C4.
[0042] The refinery dry gas is pressurized to 3.8MPa through the compressor, and the temperature is lowered to 15°C by cooling, and it is fed from the bottom of the absorption tower, and the absorbent is added to the top of the absorption tower to ensure that most of the C2~C4 light hydrocarbons are absorbed. Absorption, the absorption liquid rich in C2-C4 light hydrocarbons obtained at the bottom of the tower, and the residual tail gas such as insoluble nitrogen, hydrogen, methane, etc. are obtained at the top of the tower.
[0043] The absorption liquid at the bottom of the tower enters the desorption tower, adopts the method of temperature rise and desorption, the des...
Embodiment 2
[0045] The absorbent is a deep eutectic solvent mixed with n-decanoic acid and trioctylmonomethylammonium chloride at a molar ratio of 2:1. Refinery dry gas composition: 23% methane, 9.5% ethane, 7.4% ethylene, 0.5% propane, 1.2% propylene, 32% hydrogen, 19% air and other components above C4.
[0046] As in Example 1, the dry gas and the absorbent are countercurrently contacted and absorbed at 20°C and 3.0 MPa, the absorbing liquid is desorbed at 65°C to produce C2-C4 light hydrocarbons, and the absorbent is recovered and recycled at the bottom of the tower. The comprehensive recovery rate of C2-C4 light hydrocarbons can reach 93.6%.
Embodiment 3
[0048] The absorbent is a deep eutectic solvent mixed with lauric acid and trioctylmonomethylammonium chloride at a molar ratio of 2:1. Dry gas composition: methane 20.6%, ethane 11.9%, ethylene 14.8%, propane 0.6%, propylene 1.6%, hydrogen 28.3%, air 18.4% and other components above C4.
[0049] As in Example 1, the dry gas and the absorbent are countercurrently contacted and absorbed at 15°C and 3.2 MPa, the absorbing liquid is heated and decompressed at 70°C and 0.3 MPa to desorb C2-C4 light hydrocarbons, and the absorbent is recovered and recycled at the bottom of the tower. The comprehensive recovery rate of C2-C4 light hydrocarbons can reach 95.5%.
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