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Method for purifying water and oil recovery process comprising the same

A technology for purifying water and processes, applied in chemical instruments and methods, earth-moving drilling, mining fluids, etc., and can solve problems such as difficulty in precise control

Inactive Publication Date: 2015-09-30
BL TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, adding chemicals such as magnesium oxide or magnesium chloride to purify water is sometimes not a good option due to the additional cost of obtaining and final disposal chemicals and the difficulty of precisely controlling the process in practice

Method used

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  • Method for purifying water and oil recovery process comprising the same
  • Method for purifying water and oil recovery process comprising the same
  • Method for purifying water and oil recovery process comprising the same

Examples

Experimental program
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example 1

[0041] 1219.9 g of sodium chloride, 16.6 g of calcium chloride, 96.4 g of borax, 83.3 ml of 98% sulfuric acid, 167.9 g of sodium bicarbonate and 354.8 g of sodium silicate were dissolved in deionized water to prepare 500 liters of simulated wastewater containing silica . Further use the inductively coupled plasma analysis method to know that the concentration of silicon dioxide in the simulated wastewater is 142ppm.

[0042] The simulated wastewater passed through the electrocoagulation device with built-in aluminum or iron electrodes at a flow rate of 1 L / min at 90 °C. A direct current of 1-8A is continuously applied to the electrodes. The effluent from the electrocoagulation device was collected, cooled to room temperature, and then filtered through a 0.8 micron microfiltration membrane to produce electrocoagulation purified water.

[0043] The concentration of silica in the electrocoagulation purified water obtained by the above operation, that is, the residual silica was...

example 2

[0048] 1219.9 g of sodium chloride, 16.6 g of calcium chloride, 96.4 g of borax, 83.3 ml of 98% sulfuric acid, 167.9 g of sodium bicarbonate and 354.8 g of sodium silicate were dissolved in deionized water to prepare 500 liters of simulated wastewater containing silica . The concentration of silicon dioxide in the simulated wastewater was found to be 142ppm by inductively coupled plasma analysis.

[0049] Simulated wastewater was passed through an electrocoagulation device with built-in aluminum electrodes at a flow rate of 1 L / min at 90 °C. A direct current of 8 A was continuously applied to the electrodes. The effluent from the electrocoagulation chamber is collected, cooled to room temperature, and then filtered through a 0.8 micron microfiltration membrane to produce electrocoagulation purified water.

[0050] Another above-mentioned simulated wastewater sample (700 grams) was added to a stainless steel beaker, and heated and evaporated under open conditions to obtain 35...

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Abstract

The invention relates to a water purification method comprising the steps that: under a temperature range of 60 DEG C to below 100 DEG C, water comprising a first concentration of silicon dioxide is purified with an electro-flocculation process, such that electro-flocculation-purified water comprising a second concentration of silicon dioxide is obtained, wherein the second concentration is lower than the first concentration; and the electro-flocculation-purified water is evaporated, such that steam and a concentrated liquid are obtained. The invention also relates to an oil extraction process comprising the method.

Description

technical field [0001] The invention relates to a method for purifying water and an oil recovery process comprising the method, in particular to a method and process for purifying water containing silicon dioxide. Background technique [0002] Silica is a common substance in nature, often exists in various water bodies, and generally has a low solubility in water. In many cases it is necessary to remove silica to some extent in order to avoid deposition of silica from water and adverse effects such as fouling of water installations. [0003] There have been various attempts to remove silica from wastewater or other water sources containing silica. For example, US Patent No. 7905283 discloses a method for removing silica during heavy oil production. In this method, magnesium oxide or magnesium chloride is mixed with water before evaporation or the resulting concentrate after evaporation to co-precipitate magnesium hydroxide and silicon dioxide. When silica is removed after...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/463C02F1/02E21B43/24E21B43/34
Inventor 熊日华孙怡文戴维.M.波利佐蒂
Owner BL TECH INC