Novel alkanolamine-based biphasic solvent for CO2 capture with low energy consumption and phase change mechanism analysis

•Novel alkanolamine-based biphasic solvent with low regeneration energy and viscosity is proposed for CO2 capture.•Tertiary amine 3-(dimethylamino)propan-1-ol(3DMA1P) is firstly introduced to decrease regeneration energy.•Phase separation mechanism is revealed by NMR and LogP analysis.•Molecular dynamics simulation is applied to study liquid structure and monitor the phase separation process.