GB123752A - Apparatus for use in Recovering Solvents. - Google Patents

Abstract

123,752. Du. Pont de Nemours & Co., E. I., (Assignees of Baker. T.). Jan. 19. 1918. [Convention date]. Coating, arrangement of workshops and plant for.-Relates to plant for recovering volatile solvents from coated surfaces, such as split hides and aeroplane wings by passing a current of air over the surface and passing the vapour-laden air through an absorbent. The coated surfaces are run on a track 5 into a drying- chamber 1 heated by a steam coil 2. Solvent-laden air is withdrawn through outlets 10,11 and is led by a pipe 12 to a cooler 13 and thence to an absorbing- tower 18 in which it is passed repeatedly through a counter-current of an absorbent liquid. The vapour-freed air is withdrawn through a pipe 23 by a pump 24 and may be returned to the drying- chamber by the openings 3, normally used for inspection purposes. The wheels of the truck 5 run between rails 7. The coating-table 8<b> may have hinged sides 8<c> which are used to prevent heavy vapours from streaming down to the floor. As the coating proceeds, the truck is gradually pushed into the drying-chamber, air being meanwhile sucked into the chamber through the door 4. Varnishes.-A dope used for coating aeroplane wings consists of nitrocellulose dissolved in a mixture of butyl acetate, benzol, and ethyl acetate.