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US 10,875,785 B2Granted
Recovery of valuable resources from produced water and coal combustion products
OwnerSteven L. Cortinventor
Life of this patent
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Abstract
The present invention relates to processes employing water produced from wells that, after suitable purification steps, is processed to recover resources that can be used to treat other waste streams, such as flue gases and ashes from combustion of fossil fuels.
Claims8
A method for producing sodium bicarbonate and ammonium chloride using water produced from oil or gas wells (Produced Water), or water flowing back (Flowback Water) after fracking oil or gas wells, as a source of brine, comprising the steps of:
- removing oil from Produced Water or Flowback Water in an oil/water separator;
- after oil removal, evaporating Produced Water or Flowback Water to increase its salinity, forming a high-salinity brine, adding solid sodium chloride if necessary;
- adding sodium sulfate to precipitate sulfate salts from said high-salinity brine in a first clarifier;
- adding sodium carbonate to precipitate carbonate salts and metals from said high-salinity brine in a second clarifier;
- adding ammonia and carbon dioxide to said high-salinity brine;
- and
- reacting sodium chloride in the high-salinity brine with the ammonia and carbon dioxide to yield sodium bicarbonate and ammonium chloride.
4 more elements
Dependencies are inferred from the claim text.