Chloropicrin or trichloromethane is a colorless liquid boiling at l 12°C and having a specific gravity of 1.69. It was first prepared by Stenhouse from picric acid and bleaching powder. Its first use was in chemical warfare by the Allied troops in 1918. It was prepared in large quantities at Edgewood Arsenal during the World War, by the method developed and patented by the senior author. Picric acid, hydrated lime, and water were mixed to form a calcium picrate suspension. This suspension together with a suspension of bleaching powder and water was run into a still. The chloropicrin was steam-distilled off.
Proceedings of the Iowa Academy of Science
©1940 Iowa Academy of Science, Inc.
Sweeney, O. R.; Arnold, L. K.; Dix, R. K.; and Stelzer, W. R. Jr.
"The Production of Chloropicrin as Needed from Dry Mixtures of Picric Acid and Bleaching Powder,"
Proceedings of the Iowa Academy of Science, 47(1), 197-199.
Available at: https://scholarworks.uni.edu/pias/vol47/iss1/38