ON-LINE TESTS OF ORGANIC ADDITIVES FOR THE INHIBITION OF THE PRECIPITATION OF SILICA FROM HYPERSALINE GEOTHERMAL BRINEⅢ. SCALING MEASUREMENTS AND TESTS OF OTHER METHODS OF BRINE MODIFICATION

摘要

The Lawrence Livermore Laboratory Brine Treatment Test System at Niland, Imperial Valley, California, has been used to evaluate a promising organic compound as a scale control agent and to investigate several other approaches to the abatement of siliceous scale in brine handling equipment. Three-day scaling tests of Ethoquad 18/25 (Armak) alone (at a concentration of 25 ppm), and Ethoquad in combination with Dequest 2060 (Monsanto) showed a scaling rate reduction of 40-80% at 90°c, 15-40% at 125°C, and no reduction at 210°c. Changes in the salinity of the brine during the test series were found to have a pronounced effect on the rates of precipitation of silia and scaling, and on the effectiveness of the Ethoquad as an inhibitor. Additional data are reported on the reduction of scale by acidifcation with hydrochloric acid, and some of the effects of producing acidified brine by the addition of hydrogen peroxide were measured.