1893 Congress of Chemists met August 21 -- August 26, 1893 as part of the World's Columbian Exposition. Program of the Congress published in the Journal of the American Chemical Society, volume 15 (1893), pages 301-312; that volume also includes "Chemical notes from the Columbian Exposition", an account of the chemistry-related exhibits by John H. Long, on pages 250-260 and 312-321.
1894 First Ph.D.s in Chemistry awarded by the new University of Chicago: Adolph H. Bernhard, Über die Einführung von Acylen in den Benzoylessigaether Warren Rufus Smith, On the addition products of the aromatic isocyanides
1895 Largely at the initiative of John H. Long, a charter was granted for the Chicago Section of the American Chemical Society, March 15, 1895. At the meeting on June 3 at the Northwestern School of Medicine and Pharmacy, the following officers were elected: Frank Julian, President; J. C. Foye, Vice-President; F. B. Dains, Secretary; J. H.Long, Treasurer.
1896 First Ph.D. in Chemistry awarded by Northwestern University: Vernon James Hall, A study of ferric hydroxid in precipitation.
1903 James L. Kraft founds a wholesale cheese distribution business in Chicago; incorporated in 1909 as J. L. Kraft & Bros. Co.
1906 Carl Miner, encouraged by Julius Stieglitz, establishes Miner Laboratories, which becomes the chief chemical consulting firm in the Midwest. (Sold in 1956 to Arthur D. Little). Much of the firm's work involved foods and agricultural materials.
1910 Van Cleef Brothers, manufacturers of rubber compounds, founded by Paul Van Cleef, formerly of Eugene Arnstein Co. and Noah Van Cleef. (Chemical Bulletin, 19, 220-222, October, 1932).