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A preparation method of a magnetic desalting agent for reducing the salinity of oilfield sewage

A technology for oilfield sewage and salinity, which is applied in chemical instruments and methods, separation methods, water/sewage treatment, etc., and can solve problems such as limited application fields, high material costs, and complex device structures

Active Publication Date: 2017-07-28
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above retrieved documents or devices have complex structures, limited application fields, or high material costs, and are not suitable for desalination of oilfield sewage with high salinity; in order to solve the deficiencies of the prior art, the present invention provides a low-cost material that can be prepared The method is simple and quick, and the desalting process is simple. The preparation method of the magnetic desalting agent for reducing the salinity of oilfield sewage

Method used

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  • A preparation method of a magnetic desalting agent for reducing the salinity of oilfield sewage
  • A preparation method of a magnetic desalting agent for reducing the salinity of oilfield sewage
  • A preparation method of a magnetic desalting agent for reducing the salinity of oilfield sewage

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Effect test

Embodiment 1

[0030] a. Prepare ferroferric oxide magnetic microspheres with a diameter of 350nm by hydrothermal method, take 0.4g of ferroferric oxide magnetic microspheres and dissolve them in reactor A containing 100ml deionized water and 200ml ethanol, and mechanically stir for 20min at room temperature Finally, add 2ml of 25% ammonia water and 6ml of tetraethyl orthosilicate, continue mechanical stirring at room temperature for 7 hours, then cross-wash the precipitate with 95% ethanol and deionized water for 3 times, separate, and dissolve the separated precipitate In 80ml ethanol, be placed in reactor B for subsequent use;

[0031] b. Take 2ml of γ-(methacryloyloxy)propyltrimethoxysilane in reactor C, add 40ml of absolute ethanol solution, adjust the pH value of the solution to 5 with glacial acetic acid, ultrasonicate for 5min, drop by drop Adding it to the reactor B in step a, at a temperature of 75° C., stirring in a nitrogen atmosphere for 24 hours, to obtain surface-functionalize...

Embodiment 2

[0034] a. Prepare ferroferric oxide magnetic microspheres with a diameter of 350nm by hydrothermal method, take 0.4g of ferroferric oxide magnetic microspheres and dissolve them in reactor A containing 100ml deionized water and 200ml ethanol, and mechanically stir for 20min at room temperature Finally, add 2ml of 25% ammonia water and 6ml of tetraethyl orthosilicate, continue to stir mechanically at room temperature for 8 hours, then cross-wash the precipitate with 95% ethanol and deionized water for 3 times, separate, and dissolve the separated precipitate In 80ml ethanol, be placed in reactor B for subsequent use;

[0035] b. Take 2ml of γ-(methacryloyloxy)propyltrimethoxysilane in reactor C, add 40ml of absolute ethanol solution, adjust the pH value of the solution to 5 with glacial acetic acid, ultrasonicate for 5min, drop by drop Adding it to the reactor B in step a, at a temperature of 80° C., and stirring for 12 hours in a nitrogen atmosphere, to obtain surface-function...

Embodiment 3

[0038] a. Prepare ferroferric oxide magnetic microspheres with a diameter of 400nm by hydrothermal method, take 0.4g of ferroferric oxide magnetic microspheres and dissolve them in reactor A containing 100ml deionized water and 200ml ethanol, and mechanically stir for 20min at room temperature Finally, add 2ml of 25% ammonia water and 6ml of tetraethyl orthosilicate, continue mechanical stirring at room temperature for 7 hours, then cross-wash the precipitate with 95% ethanol and deionized water for 3 times, separate, and dissolve the separated precipitate In 80ml ethanol, be placed in reactor B for subsequent use;

[0039] b. Take 2ml of γ-(methacryloyloxy)propyltrimethoxysilane in reactor C, add 40ml of absolute ethanol solution, adjust the pH value of the solution to 5 with glacial acetic acid, ultrasonicate for 5min, drop by drop Adding it to the reactor B in step a, at a temperature of 90° C., stirring in a nitrogen atmosphere for 24 hours, to obtain surface-functionalize...

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Abstract

The invention relates to a preparation method of a magnetic desalting agent for reducing degree of mineralization of oilfield sewage. In the method, through polymerization reaction of surface-functionalized ferroferric oxide magnetic microspheres and acrylamide monomers as well as quaternary ammonium salt base-containing cationic monomers and sulfonic acid group or carboxyl-containing anion monomers, the magnetic desalting agent with a core-shell-shell structure is formed. Quaternary ammonium salt units with positive charge in the surface and sulfonic acid group or carboxyl-containing anion units with negative charge in the desalting agent can respectively adsorb and be combined with anions with negative charge and cations with positive charge in the oilfield sewage, removal rates of the desalting agent for Cl<->, SO4<2->, Ca<2+>, K<+>, Mg<2+> and Na<2+> respectively reach up to 85%, 88%, 95%, 78%, 72% and 81%, and the desalting agent can also remove pollutant such as suspending micro missible oil in the oilfield sewage. Raw materials for the method are easily obtained, and a preparation process is simple. The obtained magnetic desalting agent has the advantages of no chemical agent pollution, easiness in separation, high recycle rate and convenience in posttreatment during use.

Description

technical field [0001] The invention belongs to the field of high salinity oilfield sewage treatment, relates to a magnetic desalting agent, in particular to a preparation method of a magnetic desalting agent for reducing the salinity of oilfield sewage. Background technique [0002] As major oil fields enter the stage of tertiary oil recovery, chemical-based oil flooding technologies such as polymer flooding and surfactant flooding have been widely used. While this type of oil recovery technology increases oil recovery in oil fields, it also produces hundreds of millions of tons of oil field sewage. Many oilfield wastewaters have high salt content, mainly containing Cl - , SO 4 2- , Ca 2+ 、K + , Mg 2+ 、Na + Plasma, the total salinity is as high as tens of thousands of milligrams per liter. At present, the domestic and foreign methods of treating oilfield sewage are still based on flocculation and sedimentation, and the high salinity in oilfield sewage will seriously...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F292/00C08F220/56C08F220/34C08F220/58C02F1/461C02F1/469C02F1/56
Inventor 祖佰祎葛玉如窦新存周超玉
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI