Renewable Energy Group Inc. announced Tuesday that its wholly owned subsidiary, REG Synthetic Fuels LLC, has completed its acquisition of substantially all the assets of Tulsa-based Syntroleum Corp. The assets acquired from Syntroleum include a 50 percent ownership interest in Dynamic Fuels LLC, which owns a renewable diesel biorefinery in Geismar, La.  REG has a separate pending agreement with Tyson Foods Inc. to acquire the remaining interests in Dynamic Fuels. With the acquisition, REG now owns Syntroleum's intellectual property portfolio, which includes 186 patents issued or pending. Based in Ames, REG owns and operates nine active biorefineries in five states and distributes biodiesel through a national network of distribution terminals.