Read e-book online Chemistry of the organic dyestuffs PDF

By Rudolf Nietzki

A bout 3 years in the past I wrote a piece of writing for Ladenburg s Handworterbuch der Chemie, containing in a concise shape an exhaustive account of the heritage of the natural Dyestuf Es. this text was once additionally released individually and its stable reception brought about me to provide the current paintings, which i've got dependent so far as attainable upon the sooner one. the item in query was once no longer whole in itself, and within the current example yes sections which got here lower than different headings within the Handworterbuch were extra. New fabric has additionally been provided in the course of the advances made within the coal-tar color and in our medical wisdom of the structure of dyestuffs over the past 3 years. A achieve, a few matters were handled at a better size than was once accepted by way of the a little bit restricted area of the Handworterbuch hence, the subject-matter of the sooner paintings has been submitted to a radical revision, and the systematic class of dyestuffs into traditional chemical teams tried within the unique e-book has been conducted in a extra entire demeanour, due to the advances made in our wisdom in their constitution.
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10 INTRODUCTION. Generally speaking, the introduction of the simplest chromo- phors gives rise to yellow dyestuffs, and when stronger and more complex groups are introduced the colour changes through red For example, all quinoline and acridine dyestuffs are yellow, while only the simplest azines have this colour and become red and blue by introduction of salt-forming groups. In some other dyestuffs the presence of the lactone ring to blue &c. C=O O is assumed, and here again the oxygen atom may be replaced by a primary nitrogen atom (indigo dyestuffs) It will be noticed, on examining the constitution of the chromo.

Manufacture on a large scale depends on this principle treated with such quantities of hydrochloric acid and sodium nitrite, that about a third is converted into diazoamidoIts Aniline : is benzene, and that the latter remains dissolved in the excess of Further, the amount of hydrochloric acid is so calculated, aniline. that after decomposition of the nitrite some aniline hydrochloride remains in the mixture. The conversion of the diazoamido- benzene is aided by warming gently, and, when complete, the is saturated with dilute hydrochloric acid, and excess of aniline filtered from the sparingly soluble amidoazobenzene hydro- chloride.

Cotton possesses the power of attracting a certain amount of tannic acid from solutions containing this body, and of retaining even after washing. Cotton prepared in this manner may be In practice dyed with most basic dyestuffs just as well as wool. it the cotton treated with tannic acid insoluble salt of is further submitted to the some other antimony compound. An tannic acid and antimony oxide is formed, and action of tartar emetic or INTRODUCTION. this fixes basic dyestuffs of the latter method is 15 with the greatest ease.

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Chemistry of the organic dyestuffs by Rudolf Nietzki


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