Douglas Ellis Leng, PhD

Douglas Leng

Title: (Retired) Senior Research Scientist, Mixing Consultant
Company: Dow Chemical Company
Location: Midland, Michigan, United States

Douglas Leng, Retired Mixing Consultant and Senior Research Scientist at the Dow Chemical Company, has been recognized by Marquis Who’s Who Top Scientists for dedication, achievements, and leadership in chemical engineering and consulting.

In preparation for his career, Dr. Leng attended Queen’s University in Ontario, Canada. He earned a Bachelor of Science in 1951 and a Master of Science in 1953, and immigrated to the United States in 1955 to continue his academic pursuits. He studied at Purdue University, graduating with a PhD in 1956, and accepted a position at the Dow Chemical Company in Midland, Michigan. Dr. Leng excelled as a chemical engineer at the company for more than 40 years, rising to the ranks of fellow and senior research scientist before his departure in 1996.

Throughout Dr. Leng’s career, he has worked with mixing and distillation and addressed issues with large industrial devices by examining and tweaking the chemical reactions taking place. Often, confounding factors were overlooked when reactions were scaled from small laboratory experiments to factory-scale production, and Dr. Leng leveraged his expertise to solve these issues and devise innovative solutions, making industrial production safe and possible. For his ingenuity, he holds eight patents in his field, including a patent involving micro-dispersions of ether cells in water, which can be used to make rubber gloves. In one case, Dr. Leng was tasked with devising a stirring method under difficult conditions, which he solved using a magnetic drive and seal.

Upon his departure from the Dow Chemical Company in 1996, Dr. Leng worked as a mixing consultant at Leng Associates until his retirement. He served as a member of the advisory panel for the National Institute of Standards and Technology, and as a member of the National Research Council from 1985 to 1998. Dr. Leng received a fellowship from the American Institute of Chemical Engineers and maintains membership to the American Chemical Society. For his excellence and service to the company, he was awarded a Dow Gold Medal from the Dow Chemical Company in 1993, and for his contributions to the field, he received a Proctor & Gamble Award from the North American Mixing Forum in 1995.

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