The invention discloses a split-flow
rectisol device, which comprises an absorption
tower, a
medium pressure flash
tower, a reabsorber, a hot regenerating
tower, a
methanol water tower, a
tail gas washing tower, a plurality of heat exchangers, pumps and a circulation compressor; and the upper section of the reabsorber is provided with a flash
distillation section. The split-flow
rectisol device is not provided with a CO2 product tower, and reduces the complexity of the flow and the investment on the premise of ensuring that CO2
product gas is qualified. The split-flow
rectisol device is provided with a novel split-flow rectisol (
acid gas removal) flow for absorption from a semi-lean
methanol liquid feeding absorption tower on the upper section of the reabsorber, reduces the dosage of lean
methanol of the absorption tower, further can reduce the
energy consumption of the hot regenerating tower for hot regeneration, and saves the dosage of gas stripping
nitrogen, consumption of steam, and low level cold quantity used when the lean methanol is cooled.