A method for enriching hydrogen sulfide gas
A hydrogen sulfide and gas technology, applied in the direction of hydrogen sulfide, chemical instruments and methods, separation methods, etc., can solve the problems of loss, taking away solution, energy consumption, etc., to reduce consumption, reduce energy consumption, and reduce heat regeneration energy consumption Effect
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Embodiment 1
[0032] This embodiment is two-stage thickening, and the specific thickening steps are as follows:
[0033] 1) Raw material gas absorption: the raw material gas (CO 2 65% (v / v), H 2 S35% (v / v)) into the primary absorption tower, countercurrently contact with the absorption solvent in the primary absorption tower, absorb the hydrogen sulfide in the feed gas, and also absorb part of the CO 2 , wherein, the top pressure of the primary absorption tower is 0.35MPa, and the absorption temperature is 135°C;
[0034] 2) Absorption solution flash evaporation: The absorption solution from the primary absorption tower enters the primary flash evaporator, and the flash decompression removes part of the CO 2 and H 2 S flash steam; wherein, the pressure of the primary flash evaporator is 0.15MPa, and the flash temperature is 30°C.
[0035] 3) Thermal analysis of the flash liquid: the flash liquid from the flash evaporator enters the first-stage desorption tower, and the CO in it is desor...
Embodiment 2
[0041] This embodiment is a three-stage thickening, and the specific thickening steps are as follows:
[0042] The first stage absorption, flash evaporation, analysis process and operating parameters are the same as in Example 1, the second stage also includes absorption, flash evaporation, and thermal analysis operations, and the operating temperature and pressure process conditions are the same as the first stage. The third stage includes absorption and parse. The absorption pressure of the third stage is 0.28MPa, and the analysis temperature is the same as that of the first stage. All absorption solvents are polyethylene glycol dimethyl ether solution containing water and 2-methylimidazoline, and the water content is not more than 2%. (Based on the traditional process solvent circulation of 100, the first-stage solvent circulation in this process is 80, the second-stage solvent circulation is 12, and the third-stage solvent circulation is 6). The operating energy consumpt...
Embodiment 3
[0044] The present embodiment adopts the same technological process as that of Embodiment 1, and the first-stage absorption solvent adopts polyethylene glycol dimethyl ether solution, contains water and 2-methylimidazoline, 1,2-cyclohexanedione, and its water content Not more than 2%. The second-stage absorption solvent adopts 40% MDEA aqueous solution, containing hyoscyamine and pyridine. The operating temperature and pressure of each unit of the first-stage process are the same as in Example 1. The second-stage absorption pressure is 0.25MPa, the absorption temperature is 35°C, the top pressure of the second-stage regeneration tower is 0.12MPa, the temperature of the bottom of the tower is 112°C, and the concentration of hydrogen sulfide in the second-stage product gas is 85.2% (v / v).
[0045] Since the second stage uses MDEA aqueous solution, its heat capacity is higher, and the regeneration energy consumption increases, and the total energy consumption of the system incre...
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