1020 THE JOURNAL OF INDUSTRIAL A N D ENGINEERING CHEMISTRY Vol. 14, No. 11

tion of the acetic acid and methanol in a 100-cord plant has been shown to be a t least $25 to $50 per day, based on a steam cost of 75 cents per ton.

COTTRELL PRECIPITATOR FOR U S E WITH S P R A Y DRYING EQUIPMENT

In the preparation of soda and sulfate pulp, the Cottrell processes have been used for the recovery of soda salts from the incineration of the waste liquors. A plant installed for this purpose has proved a good return on its investment.

In order to produce finely divided solid products for various purposes, spray evaporation processes have been developed in which fuel, labor, and power savings have been obtained together with certain physical properties of the finished products. The Cottrell processes are being applied to col- lect such finely divided particles. Here the case of adapting the apparatus to a great variety of conditions, together with the saving in power, uniform pressure on the dryer, as well as other considerations, make these processes highly desirable.

In a paper limited to a review of the subject, it is impossi- ble to outline all of the possible applications or to give full details of operation, equipment, and cost on any one appli- cation. It is desired, however, to put before those interested in chemical plant operations the fact that the Cottrell proc- esses are a means of great help to the chemical plant in the treatment of gases, for purification, fractional condensation, concentration or other purposes.

BIBLIOGRAPHY 1-M. Hohlfeld, “Das Neiderschlagen des Rauchs durch Electrici-

2-C. F. Guitard, “Condensation by Electricity,” Mechanic Magazine,

3-Sir Oliver Lodge, “The Electric Disposition of Dust, Smoke, etc.;’

4-F G. Cottrell, “The Electrical Precipitation of Suspended Par-

taet,” Arch. Ges. Natuvlekr, 2 (18241, 200.

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ticles,’’ J . Ind . Eng. Chem., 8 (1910, 542.

. 5-W. A. Schmidt, “The Control of Dust in the Portland Cement Industry,” Proc. 8th Internat. Congr. Appl Ckem., 6 (1912), 117.

&A H. White, “The Electrical Separation of Tar from Coal Ash,” A m . Gaslight J., 97 (1912), 210.

7-W. H. Howard, “Fume Precipitation a t Garfield,” A m . I n s t M i n Eng., 49 (1914), 540.

8-F. G. Cottrell, “Problems in Smoke, Fume and Dust Abatement,” Smithsonian Institution Report for 1913, Pub. No. 1307, 1914, 653.

9-W. W. Strong, “Theory of Electric Precipitation,” Proc. A m . Inst. Elec. Eng , 84 (1015), 220 A F Neshit, “Theoretical Experimental Con- siderations of Electrical Precipitation,” Ibzd., 84 (1915), 507. I, Bradley, “Practical Application of Electrical Precipitation,” Ibid. , 84 (1915), 523.

10-W A. Schmidt, “Cottrell Processes of Electrical Precipitation,” Trans. Can Min Inst. , 18 (1015). 110. C. H Aldrich, “Treatment of Silver Furnace Fume by the Cottrell Process,” Trans. A m . Electrockem. SOC , 88 (1915), 119.

11-I,. D. Ricketts. “Dust Losses in Copper Smelting,” Eng. M i a . J . , 102 (1916), 396.

12-A F Meston, “Electrical Precipitation in the Chemical Industries,” Electric J . , June 1917, 248.

13-J. N. Carothers, “Electric Furnace Smelting of Phosphate Rock and Use of Cottrell Precipitator in Collecting Volatilized Phosphoric Acid,” J. Ind. Eng. Chem., 10 (1918), 35.

14-A. A. Heimrod and H D. Egbert, “The Cottrell Processes in the Sulfuric Acid Industry,” Ckem Met. Eng., 19 (1918), 309. b* 15-H. D. Egbert, “Cottrell Process and I t s Application to F o a n d v Dust Problems,’’ Trans. A m . Foundrymen’s Assoc., 27 (1918), 266.

16-J. G. Davidson, “Electrical Precipitation of Tar Fog,” Tt‘6RB, Can. Min. Inst., 21 (1918), 252.

17-E. E. Thum, “Notes on Electrical Precipitators,” Ckern. Met. Eng., 20 ( le le) , 59

18-A. B. Lamb, “Portable Electrical Precipitator for Smoke6 and Bacteria,” Trans A m . Electrockem. Soc., April 1919.

19-N. H Gellert. “Electrical Cleaning of Blast-Furnace Gas,” Blast Furnace Steel Plant, July 1919.

20-W. C. Smith and A. A. Heimrod, “Application of the Cottrell Process to the Recovery of Fume from Silver Refinery Operations.” Ckern. Mer. Eng., 21 (1919), 360.

21-N. H. Gellert. “First American Potash from a Blast Furnace,” A m . Fenilieer, September 13 (1919), 64; “Electrical Cleaning of Gases as Applied to Blast Furnace,” J. Phila. Engrs. Club, December 1919, 449.

2 Z P . E. Landolt and H. M. Pier, “Air Cleaning by the Cottrell Electrical Precipitation Processes,” J. Pktla. Engrs Club April 1920.

23-R C Tolman and S. Karrer. “Motion of Droplets and Particles ia the Field of Corona Discharge,” Ckem. Met En&, 22 (1920), 1203.

24-A. Drlasalle, “L‘Epuration Electrique des FumCes e t des Cas dans le Service des Poudres Pendant la Guerre,” Ckimie et Industvie, Sep- tember 1920, 291.

25-P. E Landolt. “Eliminating Waste and Nuisance in Smoke Fume and Gas,” Ckem. Met Ens., 26 (19211, 428.

213-W Kee and F. H. Veits, “Cottrell Electrical Precipitator a t Ameri- can Acid Company,” Chem. Age, February 1921, 71.

27-E. Anderson, “Recent Progress in Electrical Precipitation,” Chem. Met. Eng , 26 (1922), 155.

28-I,. F. Hawley and H. M. Pier, “Application of Electrical Precipi- tation to the Wood Distillation Process,” Ckem. Met. Eng , 2 6 (1922), 1931.

29-A. M. Fairlie, “Cottrell Process in the Sulfuric Acid Industry,” Ckem. Met. Eng., 25 (1921), 861.

Course in Chemistry for Salesmen The Salemen’s Association of the American Chemical Industry

warmly received the suggestion of Dr. F. E. Breithut, of the College of the City of New York, that a special course of lec- tures on chemistry be inaugurated a t the college for the benefit of the chemical salesmen. The official announcement was made a t a meeting of the New York chapter of the Association held a t the college on October 13. Following the announcement, 33 members of the Association expressed a desire to enroll for the course, which is to consist of ten lectures and to be limited to 50 members of the Association. The course is to begin in Jan- uary and to be given one evening a week.

The officers of the New York Chapter are: Chairman: JOHN A. CHEW, Warner Chemical Company. Secretary: D. H. KILLEFFER, Journal of Industrial and Engiaeering

Treasurer: GEORGE ASHWORTH, Dow Chemical Company. Chemistry.

A new society called the “Kolloidchemische Gesellschaft,” and devoted to pure and applied colloid chemistry, has recently been formed at Leipzig. A t the organization meeting on September 15, eighteen chemists and physicists spoke on the relations of colloid chemistry to other sciences and to industry.