Thomas Midgley Jr.

Thomas Midgley Jr. (May 18, 1889 – November 2, 1944) was an American mechanical and chemical engineer. He played a major role in developing leaded gasoline (tetraethyl lead) and some of the first chlorofluorocarbons (CFCs), better known in the United States by the brand name Freon; both products were later banned from common use due to their harmful impact on human health and the environment. He was granted more than 100 patents over the course of his career.[2]

Thomas Midgley Jr.
Midgley c. 1930s–1940s
Born(1889-05-18)May 18, 1889
Beaver Falls, Pennsylvania, U.S.
DiedNovember 2, 1944(1944-11-02) (aged 55)
Worthington, Ohio, U.S.
Alma materCornell University
Known for
Spouse
Carrie Reynolds
​
(m. 1911)​
Awards
Scientific career
Fields

Midgley contracted polio in 1940 and was left disabled; in 1944, he was found strangled to death by a device he devised to allow him to get out of bed unassisted. It was reported to the public that he had been accidentally killed by his own invention, but his death was privately declared a suicide.

His legacy is one of inventing the two chemicals that did the greatest environmental damage. Environmental historian J. R. McNeill stated that he "had more adverse impact on the atmosphere than any other single organism in Earth's history." Author Bill Bryson remarked that he possessed "an instinct for the regrettable that was almost uncanny." Science writer Fred Pearce described him as a "one-man environmental disaster".

Early life

Thomas Midgley Jr. was born in Beaver Falls, Pennsylvania, on May 18, 1889, the son of Hattie Louise (née Emerson) (1865 – 1950) and Thomas Midgley Sr. (1840 – 1934). His family had a history of inventing; his father was an inventor in the field of automobile tires while his maternal grandfather, James Emerson, invented the inserted tooth saw. He grew up in Columbus, Ohio, and graduated from Cornell University in 1911 with a degree in mechanical engineering.[2][3]

Career

Leaded gasoline
Sign on an antique gasoline pump advertising the TEL anti-knock compound Ethyl, a gasoline additive

In 1916, Midgley began working at General Motors. In December 1921, while working under the direction of Charles Kettering at Dayton Research Laboratories, a subsidiary of General Motors, he discovered (after discarding tellurium due to the difficult-to-eradicate smell) that the addition of tetraethyllead (TEL) to gasoline prevented knocking in internal combustion engines.[4] The company named the substance "Ethyl", avoiding all mention of lead in reports and advertising. Oil companies and automobile manufacturers (especially General Motors, which owned the patent jointly filed by Kettering and Midgley) promoted the TEL additive as an inexpensive alternative superior to ethanol or ethanol-blended fuels, on which they could make very little profit.[5][6][7] In December 1922, the American Chemical Society awarded Midgley the 1923 Nichols Medal for the "Use of Anti-Knock Compounds in Motor Fuels".[8] This was the first of several major awards he earned during his career.[2]

In 1923, Midgley took a long vacation in Miami to cure himself of lead poisoning. He said, "I find that my lungs have been affected and that it is necessary to drop all work and get a large supply of fresh air."[9] That year, General Motors created the General Motors Chemical Company (GMCC) to supervise the production of TEL by the DuPont company. Kettering was elected as president with Midgley as vice president. However, after two deaths and several cases of lead poisoning at the TEL prototype plant in Dayton, Ohio, the staff at Dayton was said in 1924 to be "depressed to the point of considering giving up the whole tetraethyl lead program".[6] Over the course of the next year, eight more people died at DuPont's plant in Deepwater, New Jersey.[9] In 1924, dissatisfied with the speed of DuPont's TEL production using the "bromide process", General Motors and the Standard Oil Company of New Jersey (now known as ExxonMobil) created the Ethyl Gasoline Corporation to produce and market TEL. Ethyl Corporation built a new chemical plant using a high-temperature ethyl chloride process at the Bayway Refinery in New Jersey.[9] However, within the first two months of its operation, the new plant was plagued by more cases of lead poisoning, hallucinations, insanity, and five deaths.[7]

The risks associated with exposure to lead have been known at least since 2000 BC,[10] while efforts to limit lead's use date back to at least the 16th century.[11][10][12] Midgley experienced lead poisoning himself, and was warned about the risk of lead poisoning from TEL as early as 1922.[13] Midgley well knew the hazards of lead. He investigated whether the risks, both in production and use, could be managed. Testing on the exhaust was completed, which he used to support the idea that 1 part tetraethyl lead per 1300 of gasoline could safely be used.[14] After the initial worker exposures, controls were developed to allow the process to operate safely. Leaded gasoline use grew exponentially. The chronic impacts of environmental lead were grossly underestimated.

On October 30, 1924, Midgley participated in a press conference to demonstrate the apparent safety of TEL, in which he poured TEL over his hands, placed a bottle of the chemical under his nose, and inhaled its vapor for 60 seconds, declaring that he could do this every day without succumbing to any problems.[7][15] However, the State of New Jersey ordered the Bayway plant to be closed a few days later, and Jersey Standard was forbidden to manufacture TEL again without state permission. Production was restarted in 1926 after intervention by the federal government. High-octane fuel, enabled by lead, was important to the military. Midgley later took a leave of absence from work after being diagnosed with lead poisoning.[16] He was relieved of his position as vice president of GMCC in April 1925, reportedly due to his inexperience in organizational matters, but he remained an employee of General Motors.[7]

Freon

In the late 1920s, air conditioning and refrigeration systems employed compounds such as ammonia (NH3), chloromethane (CH3Cl), propane, methyl formate (C2H4O2), and sulfur dioxide (SO2) as refrigerants. Though effective, these were toxic, flammable or explosive. The Frigidaire division of General Motors, at that time a leading manufacturer of such systems, sought a non-toxic, non-flammable alternative to these refrigerants.[17]

Midgley, working with Albert Leon Henne, soon narrowed his focus to alkyl halides (the combination of carbon chains and halogens), which were known to be highly volatile (a requirement for a refrigerant) and also chemically inert. They eventually settled on the concept of incorporating fluorine into a hydrocarbon. They rejected the assumption that such compounds would be toxic, believing that the stability of the carbon–fluorine bond would be sufficient to prevent the release of hydrogen fluoride or other potential breakdown products.[17] The team eventually synthesized dichlorodifluoromethane,[18] the first chlorofluorocarbon (CFC), which they named "Freon".[17][19] This compound is more commonly referred to today as "Freon 12", or "R12".[20]

Freon and other CFCs soon largely replaced other refrigerants, but also had other applications. A notable example was their use as a propellant in aerosol products and asthma inhalers.[21] The Society of Chemical Industry awarded Midgley the Perkin Medal in 1937 for this work.[22] In 1941, the American Chemical Society gave Midgley its highest award, the Priestley Medal.[23] This was followed by the Willard Gibbs Award in 1942. He also held two honorary degrees and was elected to the United States National Academy of Sciences. In 1944, he was elected president and chairman of the American Chemical Society.[2]

Death

In 1940, at the age of 51, Midgley contracted polio and was left severely disabled. He devised an elaborate system of ropes and pulleys to lift himself out of bed. On November 2, 1944, at the age of 55, he was found dead at his home in Worthington, Ohio. He had been killed by his own device after he became entangled in it and died of strangulation.[24][25][26][27] He left behind a widow, Carrie M. Reynolds from Delaware, Ohio, whom he had married on August 3, 1911.[3] It was reported to the public that his death was an accident, but it was privately declared a suicide.[27][28][29]

Legacy

Midgley's legacy is the negative environmental impact of leaded gasoline and freon.[30] Environmental historian J. R. McNeill opined that Midgley "had more adverse impact on the atmosphere than any other single organism in Earth's history",[31] and Bill Bryson remarked that Midgley possessed "an instinct for the regrettable that was almost uncanny".[32] Fred Pearce, writing for New Scientist, described Midgley as a "one-man environmental disaster".[28]

Use of leaded gasoline, which he invented, released large quantities of lead into the atmosphere all over the world.[30] High atmospheric lead levels have been linked with serious long-term health problems from childhood, including neurological impairment,[33][34][35] and with increased levels of violence and criminality in America[36][37][38][39] and around the world.[40][41] Time magazine included both leaded gasoline and CFCs on its list of "The 50 Worst Inventions".[42]

Midgley died three decades before the ozone-depleting and greenhouse gas effects of CFCs in the atmosphere became widely known.[43] In 1987, the Montreal Protocol phased out the use of CFCs like Freon.[44]

References
  1. "Franklin Laureate Database – Edward Longstreth Medal 1925 Laureates". Franklin Institute. Archived from the original on October 15, 2013. Retrieved November 18, 2011.
  2. "Thomas Midgley, Jr". invent.org. National Inventors Hall of Fame. May 17, 2023.
  3. Kettering, Charles F. "Thomas Midgley Jr. 1889–1944" (PDF). Biographical Memoirs. National Academy of Sciences. 24: 359–380.
  4. Loeb, A.P., "Birth of the Kettering Doctrine: Fordism, Sloanism and Tetraethyl Lead," Business and Economic History, Vol. 24, No. 2, Fall 1995.
  5. Jacobson, Mark Z. (2002). Atmospheric pollution : history, science, and regulation. Cambridge University Press. pp. 75–80. ISBN 0521010446.
  6. Kovarik, William (2005). "Ethyl-leaded gasoline: How a classic occupational disease became an international public health disaster" (PDF). International Journal of Occupational and Environmental Health. 11 (4): 384–397. doi:10.1179/oeh.2005.11.4.384. PMID 16350473. S2CID 44633845. Archived from the original (PDF) on June 17, 2018. Retrieved October 7, 2018.
  7. Kitman, Jamie Lincoln (March 2, 2000). "The Secret History of Lead". ISSN 0027-8378. Retrieved 2022-04-27.
  8. Nichols Medalists
  9. Kovarik, Bill. "Charles F. Kettering and the 1921 Discovery of Tetraethyl Lead In the Context of Technological Alternatives", presented to the Society of Automotive Engineers Fuels & Lubricants Conference, Baltimore, Maryland., 1994; revised in 1999.
  11. Needleman H (2004). "Lead poisoning". Annual Review of Medicine. 55: 209–22. doi:10.1146/annurev.med.55.091902.103653. PMID 14746518.
  12. Needleman, Herbert L.; Gunnoe, Charles; Leviton, Alan; Reed, Robert; Peresie, Henry; Maher, Cornelius; Barrett, Peter (March 29, 1979). "Deficits in Psychologic and Classroom Performance of Children with Elevated Dentine Lead Levels". New England Journal of Medicine. 300 (13): 689–695. doi:10.1056/NEJM197903293001301. PMID 763299. Retrieved November 17, 2020.
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  14. Midgley, Thomas (August 1, 1925). "Tetraethyl Lead Poison Hazards". Industrial and Engineering Chemistry. 17 (8): 827–828. doi:10.1021/ie50188a020. After mixing tetraethyl lead with gasoline, no great precaution need be exercised, the ratio being 1 part tetraethyl lead to 1300 of gasoline. From this point on no health hazards actually exist unless the gasoline is used very abnormally for purposes for which it was not intended.
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  16. The Poisoner's Handbook Archived December 27, 2016, at the Wayback Machine American Experience at 51:48 January 2014
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  18. Midgley, Thomas; Henne, Albert L. (1930). "Organic Fluorides as Refrigerants1". Industrial & Engineering Chemistry. 22 (5): 542. doi:10.1021/ie50245a031.
  19. Thompson, R. J. (1932). "Freon, a Refrigerant". Industrial & Engineering Chemistry. 24 (6): 620–623. doi:10.1021/ie50270a008.
  20. Garrett, Alfred B. (1962). "Freon: Thomas Midgley and Albert L. Henne". Journal of Chemical Education. 39 (7): 361. Bibcode:1962JChEd..39..361G. doi:10.1021/ed039p361.
  21. Andersen, Stephen O.; Halberstadt, Marcel L.; Borgford-Parnell, Nathan (2013). "Stratospheric ozone, global warming, and the principle of unintended consequences—An ongoing science and policy success story". Journal of the Air & Waste Management Association. 63 (6): 607–647. Bibcode:2013JAWMA..63..607A. doi:10.1080/10962247.2013.791349. PMID 23858990 – via Taylor & Francis Online. CFCs and HCFCs rapidly replaced other refrigerants in all but applications where companies accepted the increased risk of flammable and toxic refrigerant releases or in applications where the existing technologies were more energy efficient.
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  23. The Priestley Medalists, 1923-2008 – American Chemical Society
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  26. Milestones, Nov. 13, 1944 Time, November 13, 1944.
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  28. Pearce, Fred (June 7, 2017). "Inventor hero was a one-man environmental disaster". New Scientist. doi:10.1016/S0262-4079(17)31121-1. Retrieved April 25, 2022.
  29. Eschner, Kat (May 18, 2017). "One Man Invented Two of the Deadliest Substances of the 20th Century". Smithsonian. Retrieved September 21, 2021.
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  44. Climate change: 'Monumental' deal to cut HFCs, fastest growing greenhouse gases

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