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1948-49 Theatre Catalog, 7th Edition, Page 449 (436)

1948-49 Theatre Catalog, 7th Edition
1948-49 Theatre Catalog
1948-49 Theatre Catalog, 7th Edition, Page 449
Page 449

1948-49 Theatre Catalog, 7th Edition, Page 449

Glycol Vapor: Latest in Air Purification

Product and Application Information on Triethylene

Glycol Which Promises Efficient and Simple Theatre Use

At long but, theatre men can get out from under the stigma of iiheep away from theatresai whenever colds and other contagious ailments threaten the populace en masse. Thanks to the accidental discovery in 1939 of triethylene glycolis highly potent germicidal activity, operators and owners can breathe more easily%s their customers breathe more healthfullyahnowing they have liquidated that old villain of the box office. the

air-borne germ.

Naturally, there is a great deal of interest now in triethylene glycol (the active chemical in glycol vapor, sometimes known to chemists as merely TEG), its properties and behavior. And for the many theatre operators considering the addition of air sterilization to an already impressive list of services, primary interest is centered in the commercial application of this tinew" chemical to their own houses.

Glycol vaporatriethylene glycol released in the air in true vapor forma is easy to use and to further endear it to the trade, it is odorless, tasteless and invisible. Nor do its virtues end there. It is non-irritating, non-toxic and noncorrosive. Although it is deadly to airborne germs, it is harmless to human beings who usually are never aware of its presence; and has no effect on furnishings, machinery, or any of the numerous appointments worked into the general decor by architect and interior decorator. And, above all, it is safe. The presence of glycol in the theatre creates no fire hazard.

In fact, its properties approach pretty closely those of an ideal germicide. Triethylene glycol (vaporized) works won ' ders when broken down into literally bil<

lions of molecules swimming in an aqueous solution. It is not only extremely effective functionally but also well-behaved in its normal operating environment. The data books reveal that:

1. The moisture vapor pressure of a 95% solution at 900 F. is 4 mms. of mercury; at 750 F., 2.2 mms.; and at 700 F., 1.8 mms.

2. A 92% solution has a vapor pressure of 120 mms. at 2000 F. and can be economically concentrated at that temperature.

3. Glycol vapor is non-electrolytic. Dissimilar metals in contact do not exhibit the customary deleterious bi-metallic effect.

4. TEG's chemical balance is stable. Triethylene glycol does not go

over on the acid side after pro longed contact With city air, re quires no inhibitor or pH control,

remains close to neutral with a

pH near 7.

5. Glycol vapor is not only odorless but actually destroys spores and molds that cause musty odors in air conditioning equipment.

6. The dashpoint of triethylene gly col is 3300 F. In air conditioning,

the glycol always contains some water and therefore should not

Hash at all.

Glycol can be readily pumped.

8. A 95% solution has an initial crystallizing t e m p e r a t u r e of -16.80 F. A 90% solution freezes at -520 F..

9. Glycol is non-toxic at the relative saturation used. By volume, glycol concentration is about 0.00007% which compares roughly to that of the rare gas krypton, in the atmosphere.

10. Triethylene glycol does not stimulate corrosion of metal parts in air conditioning equipment.

11. Glycol vapor can be used in the theatres present ventilating system.

Glycol vapor is an effective nemesis of air-borne germs in the incredible dilution of one gram to half a billion cubic centimeters of air. Maximum efficiency is obtained with the air at relative humidities between 30 and 70%. Equally effective killing is possible at lower l1u-midities only if higher glycol relative saturation values are maintained.

Under optimum conditions, which consist of temperatures of 700 to 800 F., relative humidity under 60%, and a quantity of glycol vapor sufficient to produce at least half-saturation of the air, the rate at which pathogenic organisms are destroyed is extremely rapid. Glycol vapor under optimum conditions will kill all air-borne bacteria and virus almost instantaneously. In about the same time it takes to say the name of the high-powered germ-killing chemical, the doomed pathogens reach the end of the line.

In a dramatic test of triethylenc glycolis murderous attack on pathogens in the air, as little as three one-hundredths of a gram of glycol spray completely sterilized a chamber swarming with more than 12,000,000 bacteria. Among this select group it killed many of the most dangerous gangs in the germ world estaphylococci, pneumococci, streptm cocci and a host of other unpleasant characters.

By deliberately disintegrating the glys col into moleculesabillions of organic moleculese-sthe vaporizer releases a potent horde of germ-killers that wreak


a bacterial and virus massacre. Glycol 7

being hygroscopic penetrates the moist bacteria and establishes a heavy glycol concentration inside the bacterial cell.

The cost of glycol air treatment is well within reason. Theatre buildings equipped with air conditioning or circulating systems can be set up for glycol vaporization for as little as $500. One small vaporizer, measuring only 15 inches on a side, can handle a 250,000 cubic-foot building, or supply sterilized air for 1500 people on a. basis of 10 c.f.m. fresh air make-up per person. Approximate cost of glycol for a years operation: $100. This is not surprising, however, when the extremely low vapor pressure of triethylene glycol is considered, the vapor pressure at 700 F. being approximately 0.001 mm. of mercury. Because of this, dry air at 700 F. is saturated when it contains approximately one-half pound of vapor per million cubic feet. At 50% relative humidity, the approximate cost of triethylene glycol required to kill all air-borne bacteria and virus in 1,000,000 cubic feet of air at '700 F. is $0.020 and at 30% relative humidity the cost is $0.033.

Glycol vapor installations now include: Johnson and Johnson, Philip Morris Tobacco Co., Ltd., Parke Davis, Merck and Company, Carbide and Carbon Cheniicals, Keifer Contagious Hospital, Detroit, Mich., Premature Baby Ward of the New York Hospital and the Rivoli Theatre in New York. Two of the more interesting facts are these: Merck is utilizing glycol in several processing rooms, the filtration room and the cooling room in its streptomycin plant in Rahway, N. J., for there is much evidence to suggest that such air disinfection is of prime value in minimizing antibiotic contaminations. Johnson and Johnson is using glycol vapor in the ampule sealing room of the Ethicon Suture plant at Milltown, N. J., and is also experimenting with the use of glycol vapor in several offices at New Brunswick.

At the Lockheed Aircraft plants in Burbank, California. vaporizers were installed in two buildings housing about 1,000 workers. Almost identical buildings in the Vega plant across the street were used as controls. U.S. Army nurses followed up every absent employee to determine whether his failure to work was actually caused by 21 respiratory infece tion. In a six week period nearly one per cent of all working time at Veg:l was lost because of colds and snifiles, while in the very same weeks the time loss at Lockheed stood at less than half of one per cent. Lockheed saved a total of 160 man-days of working time in that short period.

Committees of the National Institute

1948-49 Theatre Catalog, 7th Edition, Page 449