An Introduction to Chemical Engineering; An Elementary Textbook for the Use of Students and Use of Chemical Machinery

An Introduction to Chemical Engineering; An Elementary Textbook for the Use of Students and Use of Chemical Machinery

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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. 1920 edition. Excerpt: ...first condensations can escape and bumping be prevented. The exhaust valve is then opened, and the steam gradually turned on at the inlet valve until a good jet of dry steam issues from the drip, which is then closed and the steam regulated to give the desired temperature for evaporation. This type of evaporator finds very great use in the dye, paint, textile, and canning and preserving industries. Fig. 90 shows a steam evaporating pan used in the sugar industry, made by Blair, Campbell and McLean, Ltd., Glasgow. The shell and conical top is of wrought iron, and the bottom of cast iron fixed to the top by an angle iron ring and bolts. The heating drum is of wrought iron or brass, with solid drawn brass tubes expanded into the same and beaded over, and with a large circulating tube in the centre. The drum is designed for a working pressure of 60 pounds per square inch, and is fitted with an eye-bolt for lifting and cleaning. Fig. 91 shows a Wetzel evaporating pan made by the same firm, which is used for concentrating syrup. The heating surface is obtained by a seamless copper helical coil, the ends of which are attached to the cast-iron trunnion pipe which admits and discharges the steam, and is fitted with spur gearing driven by a pulley. The Vacuum Pan.--The vacuum pan may be regarded as a modification of the vacuum dryer which has been considered previously. At the present time it is almost universal practice to evaporate under vacuum those substances which are liable to damage either by a high temperature or by the presence of air. Although the temperature at which a liquid boils depends upon the pressure to which it is subjected, in practice there are limits to the range of temperature and pressure available. As mere evaporation in a vacuum...show more

Product details

  • Paperback | 50 pages
  • 189 x 246 x 3mm | 109g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236587405
  • 9781236587404