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Artificial alizarine
370
Editorial.
" From the retorts the gas passes to the condensers, which are like the usual upright cast-iron pipes used in all gas works. Here the steam is condensed, and it washes the gas ; from these the gas passes to the scrubber, where all further impurities are washed out ; it then passes to the holder. '~* It seems that the process followed is not identical with the published description of the patent. Several modifications in details have been found necessary in practice. The manganate also appears not to work to perfection, since it has been found to lose its porosity and agglomerate after being for some time in use. It is found neeessary~ therefore~ to re-charge the retorts after a time with fresh material. Experience indicates that~ could the steam be supplied perfectly dry, this difficulty might be obviated. What may be the ultimate success of the company must be left for time to decide. It is at present supplying consumers with hydrogen gas at the rate of $2"50 per M., and oxygen gas at the rate of $5"00 per M. A r t i f i c i a l A l i z a r i n e . - - T h e manufacture of the artificial alizarine - - t h e coloriug matter of the madder root--seems to be steadily progressing toward a practically commercial success. It is only about three years ago that the discovery of the method of its artificial production in the laboratory was hailed by the chemical world with a spirit of rejoicing as a fresh triumph for purely scientific research ; while to-day it is offered in the market at prices below that demanded for the natural product, obtained from the madder. It is said that the cheapness of the artificial material is already creating distress amongst the growers of the root in those districts of continental Europe where its cultivation forms almost the sole dependence of its population, and the near future will, in all probability, by the steady growth of the production of the artificial material, add to the severity of the competition. Whether or not the result will finally be the extinction of the madder:growing industry, remains to be seen, though the probabilities point strongly in that direction. A Philadelphia industrial establishment has lately purchased a considerable quantity of the artificial alizarine, at a cost of twenty-five per cent. below that at which the natural product can be manufactured. The steady growth of the manufacture of the artificial product deserves wide.spread recognition, as one of the most important advances of which the technical chemistry of our times can boast. A merican Artisan.
Editorial.
" From the retorts the gas passes to the condensers, which are like the usual upright cast-iron pipes used in all gas works. Here the steam is condensed, and it washes the gas ; from these the gas passes to the scrubber, where all further impurities are washed out ; it then passes to the holder. '~* It seems that the process followed is not identical with the published description of the patent. Several modifications in details have been found necessary in practice. The manganate also appears not to work to perfection, since it has been found to lose its porosity and agglomerate after being for some time in use. It is found neeessary~ therefore~ to re-charge the retorts after a time with fresh material. Experience indicates that~ could the steam be supplied perfectly dry, this difficulty might be obviated. What may be the ultimate success of the company must be left for time to decide. It is at present supplying consumers with hydrogen gas at the rate of $2"50 per M., and oxygen gas at the rate of $5"00 per M. A r t i f i c i a l A l i z a r i n e . - - T h e manufacture of the artificial alizarine - - t h e coloriug matter of the madder root--seems to be steadily progressing toward a practically commercial success. It is only about three years ago that the discovery of the method of its artificial production in the laboratory was hailed by the chemical world with a spirit of rejoicing as a fresh triumph for purely scientific research ; while to-day it is offered in the market at prices below that demanded for the natural product, obtained from the madder. It is said that the cheapness of the artificial material is already creating distress amongst the growers of the root in those districts of continental Europe where its cultivation forms almost the sole dependence of its population, and the near future will, in all probability, by the steady growth of the production of the artificial material, add to the severity of the competition. Whether or not the result will finally be the extinction of the madder:growing industry, remains to be seen, though the probabilities point strongly in that direction. A Philadelphia industrial establishment has lately purchased a considerable quantity of the artificial alizarine, at a cost of twenty-five per cent. below that at which the natural product can be manufactured. The steady growth of the manufacture of the artificial product deserves wide.spread recognition, as one of the most important advances of which the technical chemistry of our times can boast. A merican Artisan.