Title Lubrication and lubricants; a treatise on the theory and practice of lubrication, and on the nature, properties, and testing of lubricants
Book Condition New
Publisher RareBooksClub.com 2012-05-20 00:00:00.000
1236287118 / 9781236287113
Seller ID Z1-F-032-00913
New. This is a reproduction of an out of print title. This book may have occasional imperfections such as missing or blurred pages, poor pictures, errant marks, etc. that were either part of the original artifact, or were introduced by the scanning process. Book is new and unread but may have minor shelf wear. Ships from UK in 48 hours or less (usually same day). Your purchase helps support the African Children's Educational Trust (A-CET). 100% money back guarantee. We are a world class secondhand bookstore based in Hertfordshire, United Kingdom and specialize in high quality textbooks across an enormous variety of subjects. We aim to provide a vast range of textbooks, rare and collectible books at a great price. Through our work with A-CET we have helped give hundreds of young people in Africa the vital chance to get an education. We provide a 100% money back guarantee and are dedicated to providing our customers with the highest standards of service in the bookselling industry.
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1900 Excerpt: ...was 14'39. The results in the following table were obtained by Benedikt and Ulzer: --Thus castor oil is sharply distinguished from the other natural oils (except grape-seed oil) by its high acetyl value, less sharply from blown oil, though 10 per cent. of the above sample of blown oil would lower the acetyl value of castor oil from 15 34 to 14-43 per cent. It appears, however, that Bonedikt's method of determining the acetyl values of oils is subject to an important error, which affects the above results in an, at present, unknown degree. Lewkowitsch has found that pure stearic, oleic, and other fatty acids which contain no alcoholic hydroxyl may nevertheless give considerable acetyl values when treated by Benedikt's process. This ho explains by stating that the fatty acids when boiled with a large excess of acetic Proc. Chem. Soc. (1890), pp. 72, 91; Jour. Soc. Chem. Ind., xix. (1890), p. 660. anhydride are converted more or less completely into anhydrides, as shewn by the following equation: --2Ci.H8jCOOH + (C2H30)?0 = (C1?H8aCO),0 + 2CH3COOH Palmitic acid Acetic anhydride Palmitic anhydride Acetic acid When the acetylated product is boiled with water, the greater part of the anhydride is reconverted into acid, (C15HS1C0)20+H20 = 2C15H31COOH, but a variable proportion remains unchanged, and does not combine with potash in the cold; thus the acetyl acid value is too low. On boiling with potash, however, the anhydride readily undergoes hydrolysis, and, by neutralizing potash, causes a fictitious acetyl value to be obtained. This may account for the fact that the acetyl values obtained by other observers have not always agreed with Benedikt's numbers. Thus Wilson gives the following average values for castor, olive, and cottonseed oils: --In order to avoid the ...