. A practical handbook of dyeing and calico-printing. With eleven page-plates, forty-seven specimens of dyed and printed fabrics, and thirty-eight woodcuts . empera-ture of the steam circulating in the steam-jacket, which is therefore fittedwith a pressure-gauge. In the head of the vessel is adapted another, to indi-cate the pressure existing in the interior of the apparatus. There is also ascrew-tap, by which, at any given moment, the excess of the reagentsemployed, or of the liquid products of the reaction, may be distilied off. Theingredients used are— 10 kilos, of pure acetate of rosanilin
. A practical handbook of dyeing and calico-printing. With eleven page-plates, forty-seven specimens of dyed and printed fabrics, and thirty-eight woodcuts . empera-ture of the steam circulating in the steam-jacket, which is therefore fittedwith a pressure-gauge. In the head of the vessel is adapted another, to indi-cate the pressure existing in the interior of the apparatus. There is also ascrew-tap, by which, at any given moment, the excess of the reagentsemployed, or of the liquid products of the reaction, may be distilied off. Theingredients used are— 10 kilos, of pure acetate of rosaniline; 20 ,, pure iodide of methyl; 20 ,, methylic alcohol, boiling at 640 to 70° C. Steam is now turned on, taking care that during the whole operation thepressure in the steam-jacket may not exceed 1 atmosphere. In the interior ofthe boiler the pressure rises rapidly to 8 atmospheres, and then more graduallyto 10 or 11, which it must not be allowed to exceed. The process lasts fourto five hours. At the expiration of that time the steam is turned off, and theapparatus allowed to cool. The pressure falls by degrees, and after twelve ANILINE GREENS. 203. Nicholsons Blue (4 B.) hours it still amounts to 4 atmospheres. A tube is then fixed to the screw-tap, which leads to a worm, communicating with a series of large globes, andthe distillation is begun. When the distillation is at an end the boiler is opened, and the semi-fluidcontents are drawn out, and put to dissolve in a boiler containing 600 litres ofdistilled water and fitted with a steam-jacket. The green dissolves entirely,whilst the violet matters remain insoluble, with the exception of a smallquantity which is kept in solution by the acid set free during the residue is removed by a first filtration. To the filtrate about 35 kilos, ofcommon salt are added ; the boiling is continued, and the free acid isneutralised by crystalline carbonate of soda. To regulate the quantity, a
Size: 2002px × 1248px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, booksubjectdyesanddyeing, bookye
