Dissolved air flotation, antisolvent crystallisation and membrane separation for separating buoyant materials and salts from water

A technology of buoyancy materials and hydrophobic parts, which is applied in evaporation separation crystallization, semi-permeable membrane separation, flotation, etc., and can solve problems such as large diameter of packed tower, easy blockage of equipment, insolubility of silver salt, etc.

Inactive Publication Date: 2016-03-30
ADVANCED WATER RECOVERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] 4. Most silver salts are insoluble
[0022] 5. Most sulfates are soluble
[0023] 6. Most hydroxide salts are only slightly soluble
[0024] 7. Most transition metal sulfides are highly insoluble
Additionally, equipment such as packed towers are prone to plugging if the solids are present in the liquid or gas phase
In addition, in most of the above methods, simultaneous heat and mass transfer cannot be achieved
And finally, packed towers are often larger in diameter and have a larger footprint, which is undesirable

Method used

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  • Dissolved air flotation, antisolvent crystallisation and membrane separation for separating buoyant materials and salts from water
  • Dissolved air flotation, antisolvent crystallisation and membrane separation for separating buoyant materials and salts from water
  • Dissolved air flotation, antisolvent crystallisation and membrane separation for separating buoyant materials and salts from water

Examples

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example

[0489] The following examples further illustrate the principles of the above-described aspects of the invention.

[0490] 1. Regarding the separation of elements such as strontium from liquids

[0491] a. Background

[0492] As noted above, typically produced / brackish water may contain strontium along with calcium and other inorganic contaminants. Normally, calcium is present in much higher concentrations than strontium in the feed water, where calcium ++ / strontium ++ The ratio is in the range of 10-50, and since the two contaminants are very similar in the aqueous solubility of their salts, it is difficult to preferentially separate strontium.

[0493] One aspect of the present invention is the initial separation of strontium from produced / brackish water with little or no calcium precipitation, even though the concentration of calcium is much higher than that of strontium. The basic idea, as described above, is to preferentially precipitate strontium out of water by prem...

example 1

[0501] In this example, 500 ml of produced water containing 442 mg / L strontium chloride and 6200 mg / L calcium chloride (given Ca ++ / Sr ++ The weight ratio is 14.0 and the molar ratio is 20.0). Keep the temperature at 25°C and add a small amount of sodium sulfate (Na 2 SO 4 ), and mixed with 500 ml of water in a constantly stirring beaker. The total amount of sodium sulfate added was 280 mg. About 10 minutes after each incremental addition, the Sr ++ The concentration and weight percent removal of strontium was calculated by the difference from the initial amount present in the water. Table 5 gives the % of sodium sulfate used to precipitate strontium.

[0502] table 5

[0503] sample

example 2

[0504] C. Example 2: Selective Precipitation of Strontium

[0505] The strontium-containing water was first reacted with sulfuric acid based on the incoming strontium concentration, wherein a 40% excess of sulfuric acid was added to complete the formation of strontium sulfate in the water. The pH of the water is below 3.0.

[0506] In this example 1 liter of produced water containing 442 mg / L strontium chloride, 6200 mg / L calcium chloride and 30 mg / L barium chloride was used (given calcium ++ / strontium ++ The weight ratio is 14.0 and the molar ratio is 20.0). The temperature was maintained at 25°C.

[0507] The chemical precipitation reaction is as follows:

[0508] SrCl 2 +H 2 SO 4 →SrSO 4 +2HCl

[0509] BaCl 2 +H 2 SO 4 → BaSO 4 +2HCl

[0510] After the reaction was complete, which took about 1 hour, the pH was raised to a range between 3.5 and 4.0, which caused strontium sulfate and barium sulfate to precipitate out, while any calcium sulfate formed remaine...

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Abstract

Provided are systems, methods, and apparatus for removing materials from liquid, such as water. The system, methods, and apparatus allow for separation of neutrally buoyant materials from liquid via flotation to or near the surface of the liquid via air bubbles. The system, methods, and apparatus allow for the selective separation of an element, such as strontium, from the liquid. The system, methods, and apparatus allow for precipitating a water soluble salt or water soluble salts from water, including adding a water-miscible solvent to a water solution including an inorganic salt. And, the system, method and apparatus also allow for the separation of the precipitated salt, and for separation of the solvent from the water.

Description

[0001] Cross References to Related Applications [0002] This application claims the priority and benefits of the filing dates of the following applications: (1) Filed on September 17, 2013, entitled "Apparatus and Method for Separating Salts from Water", No. US Patent Application 61 / 878,861; (2) US Patent Application No. 61 / 786,972, filed March 15, 2013, entitled "Flotation of Neutrally Buoyant Materials in Water"; (3) U.S. Patent Application No. 61 / 784,099, filed March 14, 2013, entitled "Selective Separation of Strontium from Produced Water"; (4) filed February 24, 2013, titled U.S. Patent Application Serial No. 61 / 768,486 for "Wetted Wall Separator Tube and Methods of separating"; (5) filed January 29, 2013, entitled "Solvent Precipitation of Salts and Concentration (Solvent Precipitation and Concentration of salts)", U.S. Patent Application No. 61 / 757,891; (6) filed on December 10, 2012, entitled "For the conversion of brackish water / produced water into useful products an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03D1/016B01D9/00B01D63/00B01D65/00B01D1/14B01F3/00C02F1/24C02F1/54B01F23/00
CPCB03D1/016B03D1/1431C02F1/24B03D2201/007B03D2203/008B01D9/0031B01D9/0036B01D9/0054C02F1/08C02F1/385C02F1/40C02F1/441C02F1/444C02F1/5236C02F1/68C02F2001/007C02F2101/10C02F2103/08C02F2103/10C02F2303/20C02F2303/22C02F2305/04C02F1/048C02F1/56C02F1/66C02F2001/5218B01D61/04B01D65/08B01D2311/04B01D2311/2642B03D1/008B03D1/01
Inventor 拉克什·戈文德罗伯特·福斯特
Owner ADVANCED WATER RECOVERY
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