US Patent No. 8,901,065 B2; The Procter & Gamble Company has patented a process for preparing a spray-dried detergent powder. The process entails detersive surfactant and other detergent ingredients. Steps include: forming an aqueous detergent slurry in a mixer; transferring the aqueous detergent slurry from the mixer to a pipe leading through a first pump and then through a second pump to a spray nozzle; contacting a liquid detergent ingredient having a viscosity of less than about 2 Pa·s ...