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Chitosan zwitterionic bactericide, preparation method and applications thereof

A technology of zwitterion and chitosan, applied in the fields of botanical equipment and methods, application, biocide, etc., can solve the problem of less research on bactericidal performance, and achieve the effect of good compatibility

Active Publication Date: 2018-10-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports on other amphoteric fungicides, and there are few studies on their bactericidal properties.

Method used

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  • Chitosan zwitterionic bactericide, preparation method and applications thereof
  • Chitosan zwitterionic bactericide, preparation method and applications thereof
  • Chitosan zwitterionic bactericide, preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1 prepares chitosan zwitterionic bactericide

[0031] The molecular structural formula is as follows:

[0032]

[0033] Preparation method: Dissolve chitosan (deacetylation degree 95%, viscosity 100mpa·s) with 2% acetic acid, add 3% urea peroxide, stir at 50°C for 8 hours, precipitate with absolute ethanol, wash until no impurities, Dry to obtain chitosan powder. Get 8.95g of degraded chitosan, dissolve it in 2% acetic acid, add 36.8g of dodecanal, 0.8g of hexadecyl ammonium chloride, adjust the pH value to 4.5 (with acetic acid) after reacting at 40°C for 10h, slowly 11.5 g of sodium borohydride solution (mass concentration 35%, 11.5 g refers to the amount of sodium borohydride solution used, the same below) was added dropwise, and the reaction was continued for 1 hour before the reaction was terminated. Adjust the pH value to 10 (adjusted with sodium hydroxide solution), precipitate the target product, dissolve it with isopropanol after washing and dry...

Embodiment 2

[0034] Embodiment 2 prepares chitosan zwitterionic bactericide

[0035] The molecular structural formula is as follows:

[0036]

[0037] Preparation method: Dissolve chitosan (deacetylation degree 95%, viscosity 200mpa·s) with 2% acetic acid, add 2% urea peroxide, stir at 50°C for 10h, precipitate with absolute ethanol, wash until no impurities, Dry to obtain chitosan powder. Take 8.95g of degraded chitosan and dissolve it in 2% acetic acid, add 42.4g of tetradecylaldehyde and 0.8g of cetyl ammonium chloride, adjust the pH value to 4.5 (adjusted with acetic acid) after reacting at 40°C for 10h, slowly drop Add 11.5g of sodium borohydride solution and continue the reaction for 2h before terminating the reaction. Adjust the pH value to 11, precipitate the target product, dissolve it with isopropanol after washing and drying, add 22g of methyl iodide and 3.6ml of NaOH solution with a concentration of 1.5mol / L, and stir for 14 hours in the dark to form N-alkyl quaternary amm...

Embodiment 3

[0038] Embodiment 3 prepares chitosan zwitterionic bactericide

[0039] The molecular structural formula is as follows:

[0040]

[0041]Preparation method: Dissolve chitosan (deacetylation degree 95%, viscosity 150mpa·s) with 2% acetic acid, add 5% urea peroxide, stir at 50°C for 4 hours, precipitate with absolute ethanol, wash until no impurities, Dry to obtain chitosan powder. Take 8.95g of degraded chitosan and dissolve it in 2% acetic acid, add 36.8g of dodecanal and 0.8g of hexadecyl ammonium chloride, adjust the pH value to 4.5 (adjusted with acetic acid) after reacting at 40°C for 10h, slowly drop Add 11.5g of sodium borohydride solution, continue the reaction for 1.5h, adjust the pH value to 4.5 (adjusted with acetic acid), continue to add 36.8g of dodecanal and repeat the above reaction (react at 40°C for 10h). After the reaction is completed, adjust the pH value to 10 to precipitate the target product. After washing and drying, dissolve it with isopropanol, add...

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Abstract

The invention discloses a chitosan zwitterionic bactericide, which has a molecular structural formula defined in the specification, wherein R1 and R2 are independently methyl, benzyl, C12H25 or C14H29, and at least one of R1 and R2 is C12H25 or C14H29. The preparation method comprises: taking chitosan, dissolving with an acetic acid solution, adding urea peroxide, and carrying out a stirring reaction for 4-10 h at a temperature of 50+ / -3 DEG C; precipitating with anhydrous ethanol, drying, dissolving in an acetic acid solution, and carrying out an alkylation reaction to generate an N-alkyl quaternary ammonium salt; and adding chlorosulfonic acid and formamide, and carrying out sulfonation to generate an O-sulfonic-N-alkyl quaternary ammonium salt so as to obtain the product. According to the present invention, the chitosan zwitterionic bactericide is a zwitterionic compound, has good compatibility with anionic polyacrylamide, cannot flocculate with anionic polyacrylamide in the sterilization of polymer-containing sewage, and has the SRB sterilization rate of 99% at a concentration of more than or equal to 50 mg / L.

Description

technical field [0001] The invention relates to a chitosan zwitterionic bactericide and a preparation method thereof, which can be used as a sulfate-reducing bacteria (SRB) bactericide for polymer flooding in oil fields in the petroleum industry and for the treatment of polymer-containing sewage in oil fields. Background technique [0002] Polymer flooding is to enhance oil recovery by injecting polymer solution. In the process of polymer injection in oilfields, various microorganisms often grow, among which sulfate-reducing bacteria (SRB) are the most common. SRB bacteria can cause corrosion damage to equipment, blockage of pipelines and water injection wells; decrease pore permeability of oil layers, reduce oil recovery; weaken the use efficiency of other oilfield chemicals. [0003] At present, the types of chemical fungicides mainly include modified quaternary ammonium salts, dialkyl quaternary ammonium salts, polyquaternary ammonium salts and combinations of various qu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N43/16A01P1/00C08B37/08C09K8/588
CPCA01N43/16C08B37/003C09K8/588
Inventor 渠慧敏马珍福罗杨韩蕊戴群韦良霞咸国旗王鹏谭云贤王聪
Owner CHINA PETROLEUM & CHEM CORP
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