The manufacture of intermediate products for dyes (1919)
Cain, John Cannell, 1871-1921 · London, Macmillan · leaf 151
INTERMEDIATE PRODUCTS FOR DYES 136 The press-cake of gypsum is boiled twice with water, 500 litres being used each time. This wash-water, instead of being added to the main filtrate and evaporated, is used for dissolving the next sulphonation. For the melt, 250 kilos, of sodium hydroxide and 125… … Fro. 19. of the dry sodium salt are used. The melting of the sodium hydroxide takes about 2i hours and the addition of the salt about half an hour. The acidification of the melt is done in two earthenware pots, each of 300 litres capacity. The amount of amyl alcohol used for each of the four…
Dyes and dyeing -- Chemistry
Internet Archive · Gerstein - University of Toronto · Public domain (published before 1931). Free to use for anything.
