American Heritage® Dictionary of the English Language, Fourth Edition
- n. A colorless crystalline compound, (C6H5)2NH, used as a stabilizer for plastics and in the manufacture of dyes, explosives, pesticides, and pharmaceuticals.
Century Dictionary and Cyclopedia
- n. A crystalline substance, (C6H5)2NH, having an agreeable odor and weakly basic properties, prepared by the dry distillation of rosaniline blue, or by heating aniline hydrochlorid and aniline together. It is used in the preparation of various dye-stuffs, and as a reagent in microchemical analysis for the detection of minute quantities of nitrates and nitrites, which yield with it a dark-blue color.
“Ninety-nine percent contained diphenylamine (DPA), a chemical used in plastic and rubber manufacturing, and 18 percent contained the endocrine disruptor endosulfan, which EPA moved to ban this year.”
“Their reactions with diphenylamine allow a certain identification of artificial silks of this class.”
“From anisidine, phenetidine and amido-diphenylamine, still more stable diazo compounds can be obtained, but the prices of these bases are rather high, and the colours produced with them are not fast to light.”
“A number of these condensation products are derivatives of diphenylamine or hydroxybenzyl alcohols.”
“At this temperature the diphenylamine will melt, and at once dissolve in the sulphuric acid, when the flask should be taken out, well shaken, and allowed to cool.”
“The filter paper used is wetted with a solution of diphenylamine [A] in sulphuric acid.”
“A drop of the diphenylamine solution is taken up by means of a clean glass rod, and the upper corners of the filter paper are touched with it, so that when the two drops run together about a quarter of the filter paper is moist.”
“The solution is prepared as follows: -- Take 0.100 grm. of diphenylamine crystals, put them in a wide-necked flask with a ground stopper, add 50 c.c. of dilute sulphuric acid (10 c.c. of concentrated sulphuric acid to 40 c.c. of water), and put the flask in a water bath at between 50° and 55° C.”
“About 1 per cent. of diphenylamine is added for the purpose of increasing its stability.”
“Hypochlorous acid gives para-amino phenol and para-amino diphenylamine (E. Bamberger, _Ber. _, 1898, 31, p. 1522).”
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A colorhouse - a manufactory of colors for tints, dyes, pigments, paints, glazes, &c. Terms associated with the science and history of colormaking.
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