Thomas Midgley, Jr.

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Thomas Midgley, Jr.
Born 18 May 1889
Beaver Falls, Pennsylvania, USA
Died 2 November 1944
Residence USA
Nationality American
Fields mechanical engineer / chemist
Alma mater Cornell University
Known for Leaded petrol and CFCs
Notable awards Nichols Medal (1922)
Perkin Medal (1937)
Priestley Medal (1941)
Willard Gibbs Award (1942)

Thomas Midgley, Jr. (May 18, 1889 – November 2, 1944), was an American mechanical engineer turned chemist. He developed both the tetra-ethyl lead (TEL) additive to gasoline and chlorofluorocarbons (CFCs), and held over a hundred patents. While lauded at the time for his discoveries, today his legacy is seen as far more mixed considering the serious negative environmental impacts of these innovations. One historian remarked that Midgley "had more impact on the atmosphere than any other single organism in Earths history." [1]

Contents

[edit] Early life

Midgley was born in Beaver Falls, Pennsylvania, to a father who was also an inventor. He grew up in Columbus, Ohio, and graduated from Cornell University in 1911 with a degree in mechanical engineering.[2]

[edit] Discovery of "Ethyl"

In December 1921, while working under the direction of Charles Kettering at Dayton Research Laboratories - a subsidiary of General Motors (he began working there in 1916), Midgley discovered that the addition of tetraethyllead (TEL) to gasoline prevented internal combustion engines from "knocking". The company dubbed the substance "Ethyl", avoiding all mention of lead in reports and advertising. Oil companies and auto makers, especially GM which owned the patent (filed by Kettering and Midgley), strenuously promoted leaded fuel as an alternative to ethanol or ethanol-blended fuels, on which they could make very little profit.[3]

In December 1922, the American Chemical Society awarded Midgley the William H. Nichols Medal, the first of several major awards he won during his career.[2]

The subsequent addition of lead to gasoline eventually resulted in the release of huge amounts of lead into the atmosphere, causing health problems around the world. Midgley himself had to take a prolonged vacation to cure himself of lead poisoning. "After about a year's work in organic lead," he wrote in January 1923, "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." He went to Miami for convalescence.[4]

In April 1923, GM created the General Motors Chemical Company to supervise the production of TEL by the DuPont company, and placed Charles Kettering as president and 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."[4] Over the course of the next year, eight more people would die at DuPont's Deepwater, New Jersey plant.[4]

Dissatisfied with the speed of DuPont's production using their "bromide process", GM and Standard Oil created the Ethyl Gasoline Corporation in 1924, and built a new TEL plant using a more dangerous high-temperature "ethyl chloride process" at the Bayway Refinery in New Jersey.[4] Within the first two months of its operation, the Bayway plant was plagued by more cases of lead poisoning, hallucinations, insanity, and then five deaths in quick succession. On October 30, Midgley participated in a press conference to demonstrate the "safety" of contact with the substance. In this demonstration, he poured tetra-ethyl lead over his hands, then placed a bottle of the chemical under his nose and breathed it in for sixty seconds, declaring that he could do this every day without succumbing to any problems whatsoever.[3][5] However, the plant was decisively shut down by the State of New Jersey a few days later, and Standard was forbidden to manufacture TEL there again without state permission.

Midgley 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 GM.[3]

[edit] Discovery of Freon

In 1930, General Motors charged Midgley with developing a non-toxic and safe refrigerant for household appliances. He (along with Charles Kettering) discovered dichlorodifluoromethane, a chlorinated fluorocarbon (CFC) which he dubbed Freon. The first patent for Freon (1,886,339) was filed by Charles Kettering and assigned to General Motor's Frigidaire division. CFCs replaced the various toxic or explosive substances previously used as the working fluid in heat pumps and refrigerators. CFCs were also used as propellants in aerosol spray cans, metered dose inhalers (asthma inhalers), and more. He was awarded the Perkin Medal in 1937 for this work.

[edit] Later life

In 1941, the American Chemical Society gave Midgley its highest award, the Priestley Medal, and followed up with the Willard Gibbs Medal in 1942. He also held two honorary degrees, and was elected to the National Academy of Sciences. In 1944, he was president and chairman of the American Chemical Society.[2]

In 1940, at the age of 51, Midgley contracted polio which left him severely disabled. This led him to devise an elaborate system of strings and pulleys to help others lift him from bed. This system was the eventual cause of his death when he was accidentally entangled in the ropes of this device and died of strangulation at the age of 55.[6] [7] Midgley died before the effect of CFCs upon the ozone layer became widely known in 1974.

[edit] External Links

[edit] References

  1. ^ McNeill, J.R. Something New Under the Sun: An Environmental History of the Twentieth-Century World (2001) New York: Norton, xxvi, 421 pp. (as reviewed in the Journal of Political Ecology)
  2. ^ a b c Inventors Hall of Fame Profile: Thomas Midgely
  3. ^ a b c "The Secret History of Lead" The Nation, March 20, 2000
  4. ^ a b c d 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.
  5. ^ Markowitz, Gerald and Rosner, David. Deceit and Denial: The Deadly Politics of Industrial Pollution. Berkeley, California: University of California Press, 2002
  6. ^ Bryson, Bill. A Short History of Nearly Everything. (2003) Broadway Books, USA. ISBN 0-385-66004-9
  7. ^ Alan Bellows (2007-12-08). "The Ethyl-Poisoned Earth". Damn Interesting. http://www.damninteresting.com/?p=932. 


Persondata
NAME Midgley, Thomas, Jr.
ALTERNATIVE NAMES
SHORT DESCRIPTION American chemist
DATE OF BIRTH 18 May 1889
PLACE OF BIRTH Beaver Falls, Pennsylvania, USA
DATE OF DEATH 2 November 1944
PLACE OF DEATH
Retrieved from "http://en.wikipedia.org/wiki/Thomas_Midgley,_Jr."
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