The present invention provides a process for the production of a protein powder having an improved solubility and taste profile from brewer's spent grain. The process comprises nanofiltration at a specified applied pressure. The present invention also provides a protein powder produced from brewer's spent grain, a process for producing food or beverage products incorporating the protein powder, and food or beverage products comprising the protein powder.

This disclosure describes methods to separate solids from liquids in a production facility. A process separates components in the process stream by applying non-condensable media to create density differences and then using a mechanical device to separate the solids from the liquids based on the density difference. The process produces the liquids and solids, which may be further processed to create valuable animal feed products.