Marion Process Solutions, one of the Iowa City-Cedar Rapids area's oldest locally based manufacturers, has been acquired by a private equity firm in a move that's expected to accelerate growth, the Corridor Business Journal reported. Chicago-based May River Capital acquired Marion Process Solutions, which manufactures industrial mixers and blenders as well as microwave vacuum drying systems, effective Dec. 31. Terms of the sale were not disclosed. May River's goals for Marion Process Solutions include tripling or quadrupling revenues into a range of $80 million to $100 million and adding complementary products, said Chip Grace, a partner at May River.