Hydrophobic associative cationic xanthan gum preparation method

A technology of hydrophobic association and cationic yellow, applied in the directions of botanical equipment and methods, chemical instruments and methods, drilling compositions, etc., can solve the problem of inability to reduce viscosity with heavy oil, achieve safe use and improve biological stability The effect of stability and easy availability of raw materials

Active Publication Date: 2017-06-13
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent document CN104761653A discloses a preparation method and application of hydrophobic association type water-soluble xanthan gum. Used for oil displacement agent and drilling filter reducer, but not for viscous reduction of heavy oil
[0006] At present, there is no public report on xanthan gum that can be used not only for viscosity reduction of heavy oil, but also for sterilization

Method used

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  • Hydrophobic associative cationic xanthan gum preparation method
  • Hydrophobic associative cationic xanthan gum preparation method
  • Hydrophobic associative cationic xanthan gum preparation method

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0039] The preparation of quaternary ammonium salt containing long alkyl chain—glycidyl dodecyl dimethyl ammonium chloride is as follows:

[0040] (1) Dissolve 13.558 mL of dimethyl dodecyl tertiary amine in 40 mL of acetone, and place it in a 100 mL single-necked round bottom flask containing magnets.

[0041] (2) Put the round-bottomed flask in (1) into a thermostatic oil bath at 45°C and start stirring.

[0042] (3) Dissolve 4.703 mL of epichlorohydrin in 10 mL of acetone to prepare an acetone solution of epichlorohydrin, and place it in a constant pressure dropping funnel.

[0043] (4) Slowly drip the acetone solution of epichlorohydrin in (3) constant pressure dropping funnel into (1) round bottom flask.

[0044] (5) In step (4), the system was reacted at 45°C for 28 hours.

[0045] (6) After the reaction is completed, the reaction system in step (4) is cooled to room temperature, and left overnight, white crystals are precipitated.

[0046] (7) The reaction system in (4) is suction ...

Embodiment 2

[0051] The preparation of hydrophobically associating cationic xanthan gum is as follows:

[0052] (1) Add 10 mL of 1% NaOH to 100 mL of distilled water to form an alkaline reaction environment.

[0053] (2) Weigh 0.5 g of xanthan gum and add it to the system in step (1), adjust the oil bath temperature to 45° C., stir and dissolve for 2 hours.

[0054] (3) Weigh 0.15 g of epoxypropyl dodecyl dimethyl ammonium chloride, dissolve it in 15 mL of distilled water, and place it in a constant pressure dropping funnel.

[0055] (4) The oil bath is heated to 70° C., and the aqueous solution of glycidyl dodecyl dimethyl ammonium chloride in the constant pressure dropping funnel is slowly added dropwise to the system in step (2).

[0056] (5) In step (4), the system was reacted at 70°C for 7 hours.

[0057] (6) After the reaction is completed, the reaction system in step (4) is cooled to room temperature. Then the system in (4) was neutralized with 0.1 mol / L HCl.

[0058] (7) Using anhydrous aceto...

Embodiment 3

[0064] The preparation of hydrophobically associating cationic xanthan gum is as described in Example 2, except that the amount of glycidyl dimethyl ammonium chloride in step (3) is 0.3 g.

[0065] Obtained 0.445 g of hydrophobically associated cationic xanthan gum, and measured its apparent weight average molecular weight M w,app =(2.054±0.971)×10 6 g / moL.

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Abstract

The present invention relates to a hydrophobic associative cationic xanthan gum preparation method, which comprises: synthesizing epoxypropyl dodecyldimethylammonium chloride from N.N-dimethyldodecylamine and epichlorohydrin in acetone; and carrying out a reaction on the epoxy group in the quaternary ammonium salt and the hydroxyl group (-OH) in xanthan gum by using the epoxypropyl dodecyldimethylammonium chloride as a modifier to introduce the quaternary ammonium salt having a long alkyl chain into the xanthan gum so as to obtain the hydrophobic associative water-soluble xanthan gum having surface activity. According to the present invention, the reaction is performed in water, the reaction conditions are mild, the raw materials are easy to obtain, and the post-treatment of the product is easy; and the modified xanthan gum has low surface tension and good solubility, can reduce the viscosity of heavy oil through the emulsification effect, can change the wettability of the stratum surface, and can increase the fluidity of the heavy oil.

Description

Technical field [0001] The invention relates to a preparation method of hydrophobically associating cationic xanthan gum, which belongs to the technical field of polymer chemistry and polymer modification. Background technique [0002] Xanthan gum is a bacterial extracellular polysaccharide. It is a pentasaccharide repeating unit composed of D-glucose, D-mannose and D-glucuronic acid. The main chain is connected to D-glucose by β-1,4 bonds. The chain is formed by alternately connecting two D-mannose and one D-glucuronic acid. Part of the mannose on the main chain is acetylated at C-6, and part of the mannose at the end of the side chain has a pyruvate group attached to the C at positions 4 and 6. The primary structure of xanthan gum is shown in formula I. [0003] [0004] Xanthan gum has good thickening properties, emulsification stability, water solubility and acid and alkali resistance, so it has a very wide range of applications in food processing, cosmetics, agriculture, tex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/00C09K8/584A01N43/16A01P1/00A01P3/00
CPCA01N43/16C08B37/0033C09K8/584
Inventor 谭业邦谷琳周静
Owner SHANDONG UNIV
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