Drying-oils

CH2=CHC = CCH = CH2. a colourless liquid which turns yellow on exposure to the air it has a distinct garlic-like odour b.p. 83-5°C. Manufactured by the controlled, low-temperature polymerization of acetylene in the presence of an aqueous solution of copper(I) and ammonium chlorides. It is very dangerous to handle, as it absorbs oxygen from the air to give an explosive peroxide. When heated in an inert atmosphere, it polymerizes to form first a drying oil and finally a hard, brittle insoluble resin. Reacts with chlorine to give a mixture of chlorinated products used as drying oils and plastics. 

In high permeability reservoirs, wells may produce dry oil for a limited time following a shut-in period, during which gravity forces have segregated oil and water near the wellbore. In fields with more production potential than production capacity, wells can be alternately produced and shut in (intermittentproduction) to reduce the field water cut. This may still be an attractive option at reduced rates very late in field life, if redundant facilities can be decommissioned to reduce operating costs. 

Drying oils. Place 3 ml. of hnseed oil in a test-tube, add about 01 g. of Utharge and boil the mixture gently for 10 minutes. When cold, pour a httle of the product on a watch glass and spread the oil into a thin film with the aid of a smah piece of paper. Pour a little of the untreated hnseed oil on another watch glass and spread it out as a thin film. Compare the times taken for the films to become dry. 

Drying capability Drying index Drying mechanisms Drying methods Drying oil Drying oils... 

Of the various tempera, egg was the most important in European painting, both in wall and panel painting. It was Htde used outside Europe. The main period of its use was in the Middle Ages and early Renaissance. After the sixteenth century, however, it was rarely used, as drying oils (qv) had become the preeminent media. 

---