Antifreeze purification

Details Antifreeze purification Antifreeze purification

1995-02-21

1995-12-12

McCarthy, Neil

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210733, 210751, 210911, C02F 152, C02F 158, C02F 166

Patent

active

054746841

ABSTRACT:
The present invention in one embodiment, is a process that uses a chemical treatment to remove arsenic, organic acids, and heavy metals from antifreeze solutions. In one aspect such a method includes adding an iron salt, to an antifreeze solution containing arsenic and heavy metals with adequate mixing for dispersion throughout the solution. Then, a base is added to increase the pH to a level from about 8 to 10. As the base is added, a precipitate forms and is then removed by standard filtration techniques. The arsenic, organic acids, and heavy metals co-precipitate with the iron and are removed by filtration. The process may either be a batch process or a continuous process.

REFERENCES:
patent: 4118243 (1978-10-01), Sandesara
patent: 5098532 (1992-03-01), Thompson et al.
patent: 5137640 (1992-08-01), Poncha
patent: 5298168 (1994-03-01), Guess
Removal of Lead & Cadmium From Aqueous Waste Steams Using Granular Activated Carbon (GAC) Columns, Reed et al., 13 Environmental Progress, pp. 61-64, Feb. 1994.
Arsenic III and Arsenic V Removal From Solutions by Pyrite Fines, Zouboulis et al., Separation Science & Technology, vol. 28, pp. 2449-2463, 1993.
Arsenic, Pollutant Removal Handbook, pp. 56-58 prior to 1994.
Product Bulletins Material Safety Data Sheets 2000-S Coastal Guard 766, Coastal Fluid Technologies, Inc., prior to 1994.
Antifreeze System Maintenance, Coastal Fluid Technologies, Inc., 1994.
Removal of Arsenic From Geothermal Fluids By Adsorptive Bubble Flotation with Colloidal Ferric Hydroxide, DeCarlo et al, Environ. Sci. Technology, vol. 19, pp. 539-544, 1985.

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