Synthetic Tannins: Their Synthesis, Industrial Production and ApplicationD. Van Nostrand Company, 1922 - 143 pages |
Other editions - View all
Synthetic Tannins, Their Synthesis, Industrial Production and Application Georg Grasser Limited preview - 2022 |
Synthetic Tannins, Their Synthesis, Industrial Production and Application Georg Grasser Limited preview - 2019 |
Common terms and phrases
acetic acid acid and formaldehyde acidified added addition alcohol alkali analysis aniline aniline hydrochloride aqueous solution bakelite blue coloration caustic soda cent Chem chemical chrome Collegium completely compounds concentrated sulphuric acid condensation product containing convert pelt cresol crude Neradol deposit determined digallic acid dissolved easily soluble ellagic acid employed ester exhibited ferric chloride filtered filtrate formaldehyde gallic acid glucose half-neutralised heated hide powder HSO3 hydrochloric acid hydroxybenzoic acids insoluble latter leathers tanned liquid liquor mass methyl mixture molecule NaOH natural tannins Neradol D Nierenstein obtained opalescence Ordoval Ordoval G partly neutralised pelt into leather phenol phlobaphenes pickling piece of pelt possessing ppte precipitates gelatine quantity quebracho quebracho extract reaction resultant leather similar sodium solubilising soluble soluble in water substance sulphite sulphonic sulphuric acid synthetic tannins tannage tanning effect Tanning experiments tanning materials tanning properties tannoid properties temperature tensile strength water-soluble wood pulp yields он
Popular passages
Page 84 - In the case of tans it must be clearly stated in the report whether the calculation is on the sample with moisture as received, or upon some arbitrarily assumed percentage of water ; and in that of liquors whether the percentage given refers to weight or to grams per 100 c.cs.
Page 80 - C., and the extraction continued with boiling water till the filtrate amounts to 1 litre. It is desirable to allow the material to soak for some hours before commencing the percolation, which should occupy not less than 3 hours, so as to extract the maximum of tannin. Any remaining solubles in the material must be neglected or reported separately, as " difficultly soluble
Page 82 - ... of water and must be sufficiently free from soluble organic matter to render it possible in the ordinary washing to reduce the total solubles in a blank experiment with distilled water below 5 grm.
Page 79 - ... cm. deep in a beaker, placed in a good light on black glass or black glazed paper, must appear dark and free from opalescence when viewed from above. Any necessary mode of filtration may be employed, but if such filtration causes any appreciable loss when applied to a clear solution, a correction must be determined and applied as described in paragraph 6.
Page 80 - Sumach and myrobalans extracts should be dissolved at a lower temperature. Solid extracts shall be dissolved by stirring in a beaker with successive quantities of boiling water, the dissolved portions being poured into a litre flask, and the undissolved being allowed to settle and treated with further portions of boiling water. After the whole of the soluble matter is dissolved the solution is treated similarly to that of a liquid extract. Solid tanning materials, previously ground till they will...
Page 82 - The moisture in the air-dried powder is estimated and the quantity equal to 6.5 grm. actual dry hide powder is calculated, which will be practically constant if the powder be kept in an air-tight vessel. Any multiple of this quantity is taken according to the number of analyses to be made and wetted again with approximately 10 times its weight of distilled water.
Page 83 - At the end of one hour the powder is squeezed in linen to free it as far as possible from the residual liquor, and washed and squeezed repeatedly with distilled water, until on adding to 50 cc.
Page 79 - ... and 100° in shallow flat-bottomed basins which shall afterwards be dried till constant at the same temperature and cooled before weighing for not less than 20 minutes in an air-tight desiccator over dry calcium chloride. "Moisture...
Page 79 - ... 1 cm. deep in a beaker placed in a good light on black glass, or black glazed paper must appear dark and free from opalescence when viewed from above. Any necessary mode of filtration may be employed, but if such filtration causes any appreciable loss, when applied to a clear solution, a correction must...