Compartmented reaction vessel, system and method for converting a substrate to a product

A reaction vessel for converting a substrate to a product, comprising:

• an inlet opening for introducing a liquid medium and/or a substrate within said reaction vessel,
• an outlet opening for obtaining a product from said reaction vessel, a length direction extending substantially along a central axis (A) of said reaction vessel, and
• a plurality of baffles distributed along a circumference of an inner surface of the reaction vessel, wherein each baffle extends along said length direction and from an inner surface of the reaction vessel towards an interior of the reaction vessel,
• wherein, for each baffle, the reaction vessel is rotatable around the central axis into a position in which the baffle extends from a bottom half of the inner surface at least to a horizontal plane (H) coinciding with the central axis, thereby dividing a bottom half of the internal volume of the reaction vessel into compartments,
• wherein the plurality of baffles are configured to allow a liquid medium contained within the reaction vessel to move sequentially from a first one of the compartments into a neighbouring one of the compartments during rotation of the reaction vessel.