Anthraquinone sentence example

anthraquinone
  • In a similar manner anthrapurpurin is prepared by alkali fusion of anthraquinone 2.8 disulphonic acid.
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  • A more delicate method consists in adding a very little anthraquinone and sodium amalgam; absolute alcohol gives a green coloration, but in the presence of minute traces of water a red coloration appears.
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  • After this treatment, the mixture is run into lead-lined vats and treated with sulphuric acid, steam is blown through the mixture in order to bring it to the boil, and the anthracene is rapidly oxidized to anthraquinone.
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  • It is then removed to lead-lined tanks and again washed with water and dried; the product obtained contains about 95% of anthraquinone.
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  • Various synthetic processes have been used for the preparation of anthraquinone.
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  • Various sulphonic acids of anthraquinone are known, as well as oxy-derivatives, for the preparation and properties of which see Alizarin.
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  • Perkin; the method being to sulphonate anthraquinone, and then to convert the sulphonic acid into its sodium salt and fuse this with caustic soda.
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  • It is then oxidized to anthraquinone by means of sodium dichromate and sulphuric acid in leaden vats, steam heated so that the mixture can be brought to the boil.
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  • Penta-oxyanthraquinones have been obtained from purpurin and anthrapurpurin, while a hexaoxyanthraquinone has been obtained from 1.5 dinitro anthraquinone.
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  • In order to synthesize alizarin, they converted anthracene into anthraquinone and then brominated the quinone.
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  • After the separation of the silver salt (see above) obtained on sulphonating anthraquinone, the remaining acid liquid gives on treatment with calcium carbonate the calcium salt of anthraquinone 2.6 disulphonic acid (anthraquinone-a-disulphonic acid).
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  • For naphthalene quinones see Naphthalene; for anthracene quinone see Anthraquinone; and for phenanthrene quinone see Phena Nt H Rene.
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  • Oxidizing agents convert anthracene into anthraquinone; the production of this substance by oxidizing anthracene in glacial acetic acid solution, with chromic acid, is the usual method employed for the estimation of anthracene.
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