Method for treating polymer flooding oil-extraction wastewater by employing organic modified sepiolite

A technology for oil extraction wastewater and sepiolite, applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, can solve problems such as difficult equipment maintenance, large dosage of chemicals, and many restrictions, and achieve low cost, The effect of rapid processing and less equipment requirements

Inactive Publication Date: 2014-06-11
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of this method is that the dosage of the drug is relatively large, and the general dosage is the same as the concentration of the polymer to be treated.
[0009] The above methods have more or less deficiencies in practical application, such as many restrictions, high cost, poor effect, difficult equipment maintenance, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]Preparation of modified sepiolite powder: Take 6g of refined sepiolite powder produced in Liuyang, Hunan, add it to 100ml of hydrochloric acid solution with a concentration of 15wt%, and mix and stir at 25°C for 1.5h. Vacuum pump filtration, washing, and drying to obtain acid-activated sepiolite powder; the acid-activated sepiolite powder obtained in the previous step was placed in a muffle furnace, and the temperature was adjusted to 300 ° C. After 4 hours of roasting, it was taken out and cooled, and ground to 600 mesh to obtain The sepiolite powder after thermal activation; Get the sepiolite powder 5g after the thermal activation that last step obtains, add 0.3g cetyltrimethyl ammonium bromide, place 100ml ethanol water together (ethanol and water volume ratio 1: 1) In the solution, mix and stir at 25°C for 1.5h, filter with a vacuum pump, wash with distilled water and ethanol alternately for several times, then dry in an oven at 40°C, and finally grind to 800 mesh to ...

Embodiment 2

[0038] A method for modifying sepiolite to adsorb hydrolyzed polyacrylamide, comprising the steps of:

[0039] 1) Acid activation: add sepiolite raw materials into hydrochloric acid solution with a concentration of 13wt%, mix and stir, filter, wash, and dry to obtain acid-activated sepiolite powder; solid-to-liquid ratio (ratio of sepiolite to hydrochloric acid solution) At 1:8g / ml, the stirring time is 1h.

[0040] 2) Thermal activation: roast the acid-activated sepiolite powder to remove water, cool and grind to obtain heat-activated sepiolite powder; the roasting temperature is 250°C, the roasting time is 2 hours, and the grinding reaches 400 mesh;

[0041] 3) Organic modification: add heat-activated sepiolite powder into ethanol aqueous solution of cetyltrimethylammonium bromide (volume ratio of ethanol to water: 1:1), wherein the heat-activated sepiolite powder is mixed with ten The mass ratio of hexaalkyltrimethylammonium bromide is 10:1, mixed and stirred, filtered, wa...

Embodiment 3

[0046] A method for modifying sepiolite to adsorb hydrolyzed polyacrylamide, comprising the steps of:

[0047] 1) Acid activation: add sepiolite raw materials into hydrochloric acid solution with a concentration of 15wt%, mix and stir, filter, wash, and dry to obtain acid-activated sepiolite powder; solid-to-liquid ratio (ratio of sepiolite to hydrochloric acid solution) At 1:25g / ml, the stirring time is 3h.

[0048] 2) Heat activation: roast the acid-activated sepiolite powder to remove water, cool and grind to obtain heat-activated sepiolite powder; the roasting temperature is 350°C, the roasting time is 8 hours, and the grinding reaches 800 mesh;

[0049] 3) Organic modification: add heat-activated sepiolite powder into ethanol aqueous solution of cetyltrimethylammonium bromide (volume ratio of ethanol to water: 1:1), wherein the heat-activated sepiolite powder is mixed with ten The mass ratio of hexaalkyltrimethylammonium bromide is 50:1, mixed and stirred, filtered, wash...

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Abstract

The invention relates to the field of industrial water treatment and in particular relates to a method for treating polymer flooding oil-extraction wastewater by employing organic modified sepiolite. The method comprises the following steps: 1) acid activation, namely adding a sepiolite raw material into a hydrochloric acid solution, mixing, stirring, filtering, washing, and drying to obtain sepiolite powder subjected to acid activation; 2) thermal activation, namely roasting and dehydrating the sepiolite powder subjected to acid activation, and cooling and grinding to obtain sepiolite powder subjected to thermal activation; 3) organic modification, namely adding the sepiolite powder subjected to thermal activation into an ethanol aqueous solution of cetyl trimethyl ammonium bromide, mixing, stirring, filtering, washing, drying and grinding to prepare the organic modified sepiolite powder; and 4) adsorption, namely regulating the pH value of the polymer flooding oil-extraction wastewater by using an acid, adding a water-soluble aluminum salt, adding the organic modified sepiolite powder obtained in the step 3) for adsorption, stirring or shaking, standing and settling. The sepiolite serves as a raw material and is low-price and readily available, the process for activation and modification of the sepiolite is simple, and the sepiolite is non-toxic and harmless, has an obvious adsorption effect, rapid in treatment and high in adsorption amount.

Description

technical field [0001] The invention relates to the field of industrial water treatment, in particular to the treatment of polymer-containing wastewater in polymer flooding and oil recovery technology, so as to effectively adsorb partially hydrolyzed polyacrylamide (HPAM) therein. Background technique [0002] As my country's oilfield exploitation has entered the middle and late stage, in order to enhance the oil recovery rate, improve the oil-water flow rate ratio, and increase the crude oil content in the produced material, the polymer flooding recovery technology has been widely used. In this case, the relatively cheap partial hydrolysis Polyacrylamide (HPAM) is widely used in oil recovery. However, the resulting oil production wastewater containing partially hydrolyzed polyacrylamide has become a technical problem for the large-scale application of polymer flooding due to the increasing difficulty of treatment. Therefore, it is necessary to find a method that can effecti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28B01J20/22
Inventor 周朝昕蓝天王庆田熙科杨超
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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