Coal-tar Sentence Examples
Among the more recently introduced antiseptics, chinosol, a yellow substance freely soluble in water, and lysol, another coal-tar derivative, are much used.
This has led to the estimation of sugar by means of the polarimeter, and of the calorific power of fuels, and the valuation of ores and metals, of coal-tar dyes, and almost all trade products.
Mitscherlich prepared it in 1834 by distilling benzoic acid with lime; and in 1845 Hofmann discovered it in coal-tar.
Benzene is manufactured from the low-boiling fractions of the coal-tar distillate.
At first, the oil was manufactured principally for combustion in the Read-Holliday lamp and for dissolving rubber, but the development of the coal-tar colour industry occasioned a demand for benzols of definite purity.Advertisement
When the substance operated upon is of uncertain composition, as, for example, coal, wood, coal-tar, &c., the term destructive distillation is employed.
Wood-spirit, petroleum and coal-tar distillates are condensed in plant of the latter type.
The Coffey still is one of the most effective and is employed in the spirit, ammonia, coal-tar and other industries.
The technology of distillation is best studied in relation to the several industries in which it is employed; reference should be made to the articles COAL-TAR, GAS, PETROLEUM, SPIRITS, NITRIC ACID, &c. (C. E.*)
If, however, the insect were content with this method of reproduction the disease could be isolated by surrounding the infected patches with a deep ditch full of some such substance as coal-tar, which would prevent the insects spreading on to the roots of healthy vines.Advertisement
His first research, carried out in Liebig's laboratory at Giessen, was on coal-tar, and his investigation of the organic bases in coal-gas naphtha established the nature of aniline.
For this work he was in 1889 awarded a Davy medal by the Royal Society, which ten years previously had bestowed upon him a Royal medal in recognition of his investigations in the coal-tar colours.
Nitric acid finds extensive application in the manufacture of sulphuric acid, certain coal-tar colouring matters, explosives, and in the production of various nitrates.
The lining of the converter is made of 90% of the mixture of lime and magnesia which results from calcining dolomite, (Ca,Mg)CO i, at a very high temperature, and 10% of coal tar freed from its water by heating.
Japp, in the Kekule memorial lecture he delivered before the London Chemical Society on the 15th of December 1897, declared that three-fourths of modern organic chemistry is directly or indirectly the product of Kekule's benzene theory, and that without its guidance and inspiration the industries of the coal-tar colours and artificial therapeutic agents in their present form and extension would have been inconceivable.Advertisement
Devoting himself almost entirely to industrial chemistry, he gave much attention to the manufacture of coal-tar products, and particularly carbolic acid, for the production of which he established large works in Manchester in 1865.
The amount of pyridine produced in most of these processes is very small, and the best source for its preparation is the "light-oil" fraction of the coal-tar distillate.
Since about 1800 this industry had been confined to the north-west of Bohemia, and it survived just till 1900, when it was entirely abandoned - not because its product had become any less necessary, but, quite on the contrary, because the enormously increasing demand for fuming sulphuric acid, arising through the discovery of artificial alizarine and other coal-tar colours, could not possibly be supplied by the clumsy Bohemian process.
They also investigated certain hydrocarbons occurring in the high boiling point fraction of the coal tar distillate and solved the constitution of phenanthrene.
Ten volumes of the purest coal-tar benzene were shaken for four hours with one volume of sulphuric acid, the acid layer was removed and neutralized with lead carbonate, and the lead thiophen sulphonate obtained was distilled with an equivalent quantity of ammonium chloride.Advertisement
Koppers makes carbon pitch, coal tar distillates, and phthalic anhydride and ships products to customers in rail cars.
Inn 54 (B) " Along with the St Andrew's Hospital crockery a number of bottles containing coal tar were also excavated.
Three petroleum pitches and three coal tar pitches were prepared from Ashland A240 and a soft coal tar pitches were prepared from Ashland A240 and a soft coal tar pitch, respectively.
Coal tar dyestuffs Between 1820 and 1850 a great deal of research went on into the chemistry of coal tar dyestuffs Between 1820 and 1850 a great deal of research went on into the chemistry of coal tar.
This shows a familiarity with coal tar distillation that was probably acquired by practical experience within the GLCC.Advertisement
Coal tar dyestuffs Between 1820 and 1850 a great deal of research went on into the chemistry of coal tar.
If the scalp is very scaly then a shampoo containing coal tar or salicylic acid may help to remove it.
The most exciting thing was Sid demanding coal tar soap, nothing flowery scented that Kathy might get suspicious at.
Many of these stains were coal tar dyes developed in a dazzling array for the textile industry.
Zinc and Coal Tar Paste BP containing zinc oxide 6% and coal tar 6% .
The word " benzine " is sometimes used in commerce for the coal-tar product, but also for the light petroleum better known as petroleum-benzine; a similar ambiguity is presented by the word " benzoline," which is applied to the same substances as the word " benzine."
Benzene is manufactured from the low-boiling fractions of the coal-tar distillate '(see' Coal-Tar).
In chemical technology enormous strides have been made, as is apparent from the coal-gas, coal-tar, mineral oil, spirits and mineral acids industries.
In some cases, especially in dry distillations, the furnace flames play directly on the retorts, in others, such as in the case of nitric acid, the whole still comes under the action of the furnace gases to prevent condensation on the upper part of the still, while in others the furnace gases do not play directly on the base or upper portion of the still but are conducted around it by a system of flues (see Coal-Tar).
About 1874 he abandoned the manufacture of coal-tar colours and devoted himself exclusively to research in pure chemistry, and among the discoveries he made in this field was that of the reaction known by his name, depending on the condensation of aldehydes with fatty acids (see Cinnamic Acid).
The hydrocarbon occurs in wood-tar and in petroleum, and is prepared commercially by fractional distillation of the light oil fraction of the coal-tar distillate (see Coal Tar).
An increased risk of skin cancer in psoriatic patients treated with a combination of coal tar and UVB radiation has been reported.
Zinc and Coal Tar Paste BP containing zinc oxide 6% and coal tar 6 %.
Ichthammol is a coal-tar derivative, and while natural in origin, is not an herbal remedy.
Eczema and other skin diseases can be treated with an ointment that contains a derivative of coal tar.
Parts of the coal tar are volatile, so the bathroom should be well ventilated.
Aftershave lotions, sunscreens, and certain topical sulfa drugs may be changed into allergens, while coal tar and certain oils used in manufacturing may become irritants after light exposure.
Coal-tar salves can help relieve symptoms of nummular dermatitis that have not responded to other treatments, but these ointments have an unpleasant odor and stain clothing.
Coal-tar shampoos may be used for seborrheic dermatitis that occurs on the scalp.