METHOD OF REGENERATING WATER-METHANOL SOLUTION Russian patent published in 2025 - IPC C07C29/80 C07C31/04 

FIELD: chemical or physical processes.

SUBSTANCE: invention relates to a method of regenerating a water-methanol solution (WMS) and can be used as part of field plants for complex treatment of natural gas when preparing it for transportation during liquefaction of natural gas. In the proposed method, the WMS to be regenerated is fed into the middle part of the rectification column, note here that, depending on methanol concentration, it is fed into the column at higher methanol concentration and lower at lower concentration. WMS regeneration is carried out in axial slit channels of radial-spiral type heat and mass exchange units by mass exchange in liquid and steam forward flow in each heat and mass exchange unit, note here that liquid phase flows downward in form of film along axial channel walls while gas (vapor) phase also flows downward via said slit channels. At the same time along the height of the entire rectification column the liquid and vapor phases move in a counterflow—the liquid phase from top to bottom, and the vapor phase from bottom to top. A portion of the regenerated methanol condensed in the axial slot channels of the condenser is sent to the consumer, and the rest part flows down in the form of reflux into the axial slotted channels of the upper heat and mass exchange unit. Supply of heat carrier with required temperature into radial-spiral slotted channels of each heat and mass exchange unit provides the possibility to maintain optimum temperature of mass exchange process along the whole height of column. At that, as heat carrier for heat supply to evaporator flue gas with temperature from 150 to 800 °C is used, formed by fuel combustion on flameless burner with maintenance of specified adiabatic fuel combustion temperature, by diluting the air supplied to the burner with exhaust flue gas.

EFFECT: creation of high-efficiency environmentally friendly, energy-saving method of WMS regeneration, with the possibility of obtaining methanol of higher concentration and reducing concentration of methanol in water to be recycled.

5 cl, 2 dwg