DRY and CLEAN AIR at the RIGHT TEMPERATURE
I/EC
REPORTS
Polyisoprene Gets Ready
• to control your product quality • to protect a critical operation • to protect apparatus from moisture damage • to DRY your material or product • to control packing or storage conditions • to assure precision in testing or research • to increase air conditioning capacity
Bright future in sight for new synthetic natural rubber as industry steps up development work
Air Condition by the NIAGARA Method Using HYGROL Liquid Absorbent
This compact method, giving high capacity in small space,removes moisture from air by contact with a liquid in a small spray chamber. The liquid spray contact temperature and the absorbent concentration, factors that are easily and positively controlled, determine exactly the amount of moisture remaining in the air. Most effective because . . . it removes moisture as a separate function from cooling or heating and so gives a precise result, and always. Niagara machines using liquid contact means of
drying air have given over 20 years of service. The apparatus is simple, parts are accessible,con trois are trustworthy. Most reliable because...the absorbent is continuously reconcentrated automatically. N o moisture-sensitive instruments are required to control your conditions . . . no solids, salts or solutions of solids are used and there are no corrosive or reactive substances. Most flexible because. ..you can obtain any condition at will and hold it as long as you wish in either continuous production, testing or storage.
Write for Bulletins 112 and 131 and complete information on your air conditioning problem.
N I A G A R A BLOWER
COMPANY
Dept. EC-5, 4 0 5 Lexington Ave., N e w York 17, N . Y . Niagara District Engineers in Principal Cities of U. S. and Canada
REDUCE OPERATING COST
• ERHAPS at this m o m e n t a heavily laden truck is pounding the highways somewhere with a dual j o b to do. T h e truck's first j o b , of course, is to carry goods to the marketplace. T h e second task is not so routine. T h e truck is a rolling development lab for testing t h e latest thing in tires—heavy-duty truck tires m a d e entirely from synthetic materials. Since Goodrich-Gulf and Firestone first announced successful synthesis of cw-l,4-polyisoprene ( I / E C , April 1956, p p . 778, 784), t h e new synthetic natural rubbers have been tested from every angle. And though these tests continue, some of the e n d results of this major breakthrough a r e clear:
of VACUUM SYSTEMS with this "AERO" (air -cooled) VAPOR CONDENSER With free air the cooling medium you use the least water, evaporated in the air stream. You save the cost and pumping of large volumes of condensing water.
Niagara Aero Vapor Condenser. This compact machine may be installed directly above stripping column or vacuum evaporator.
Air-vapor subcooling reduces mixture evacuated from the system, saving in the operation of steam ejector or vacuum pump. This air-cooled condenser gives you more capacity than other types at a substantial saving of steam and power. Water supply, scaling treatment and disposal problems are eliminated.
easily maintained unit replacing both cooling tower and barometric or surface type condenser.
You get pure condensate, an improved product; often make a profit on recovery of residues now wasted. There can be no contamination of your product at any time; it never touches raw water. Condensing, of water, of solvents or of your product, is simplified; you have one, compact,
Maintenance expense is low. Balanced Wet Bulb Control provide precise, year 'round adjustment of capacity to load. Constant temperature, uniform products and maximum production 12 months a year are assured. Unit capacities up to 15 million BTU.
Write for full information. Ask for Bulletin 129R
N I A G A R A BLOWER
COMPANY
Dept. EC-5, 4 0 5 Lexington Ave., N e w York 17, N . Y . Niagara District Engineers in Principal Cities of U. S. and Canada 30 A
INDUSTRIAL AND ENGINEERING CHEMISTRY
• Polyisoprene will fill the expected g a p b e t w e e n supply a n d d e m a n d for natural rubber. • Our d e p e n d e n c e on overseas r u b b e r sources a n d g o v e r n m e n t stockpiling of natural rubber can come to a n end. • A n e w branch of the synthetic r u b b e r industry will blossom.
Types of synthetic rubber d e veloped during a n d shortly after World W a r I I n o w account for about 6 3 % of all the rubber used in this country. It's unlikely that this percentage c a n be pushed m u c h higher. Natural rubber—or an equivalent synthetic product—is still best for m a n y heavy-duty uses. Preference for natural rubber shows u p clearly in Europe, where some 7 5 % of all the rubber used is natural despite the marked price advantage enjoyed by t h e synthetics. N a t u r a l rubber, then, is still vital, a n d industry experts forecast a serious shortage within 3 to 5 years.
