The following sections of this BookRags Literature Study Guide is offprint from Gale's For Students Series: Presenting Analysis, Context, and Criticism on Commonly Studied Works: Introduction, Author Biography, Plot Summary, Characters, Themes, Style, Historical Context, Critical Overview, Criticism and Critical Essays, Media Adaptations, Topics for Further Study, Compare & Contrast, What Do I Read Next?, For Further Study, and Sources.
(c)1998-2002; (c)2002 by Gale. Gale is an imprint of The Gale Group, Inc., a division of Thomson Learning, Inc. Gale and Design and Thomson Learning are trademarks used herein under license.
The following sections, if they exist, are offprint from Beacham's Encyclopedia of Popular Fiction: "Social Concerns", "Thematic Overview", "Techniques", "Literary Precedents", "Key Questions", "Related Titles", "Adaptations", "Related Web Sites". (c)1994-2005, by Walton Beacham.
The following sections, if they exist, are offprint from Beacham's Guide to Literature for Young Adults: "About the Author", "Overview", "Setting", "Literary Qualities", "Social Sensitivity", "Topics for Discussion", "Ideas for Reports and Papers". (c)1994-2005, by Walton Beacham.
All other sections in this Literature Study Guide are owned and copyrighted by BookRags, Inc.
Formaldehyde (HCHO) is the simplest member of the class of organic compounds known as aldehydes. Aldehydes are distinguished by the presence and end position of a carbonyl group (-OH) attached to only one carbon atom. At room temperature, formaldehyde is an extremely reactive colorless gas with a suffocating odor. It is commonly sold as an aqueous solution (formalin) or in solid polymeric forms (paraformaldehyde and trioxane). Formaldehyde is used in the manufacture of dyes, in the production of synthetic resins, and in embalming and as a preservative for biological specimens.
Formaldehyde was first intentionally produced by August Hofmann, a German chemist (1818-1892), in 1867. Justus von Liebig had researched aldehydes earlier but had never succeeded in producing formaldehyde. Alexander Mikhailovich Butlerov (1828-1886) had hydrolyzed methylene acetate while trying to form methyl glycol and produced formaldehyde gas. He had noted that the product of the reaction behaved as an aldehyde. Hofmann, in 1867, exposed a mix of methyl alcohol vapors and air over a hot platinum spiral to form stable formaldehyde. Formaldehyde today is produced either from methanol, as Hofmann did, or by oxidizing hydrocarbons.
Due to health concerns, in 1992 the Occupational Safety and Health Administration (OSHA) lowered the legal exposure limits for formaldehyde from 1.0 parts per million to 0.75 parts per million. Nonetheless, the U.S. formaldehyde market remains strong with production anticipated to reach 12 billion lb (5.4 billion kg) annually by the end of the century.