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Method for improving viscosity and water solubility of welan gum

A technology of adhesive viscosity and water solubility, which is applied in the field of modification of microbial polysaccharides, can solve problems such as the inability to use thickeners for fracturing fluids, low viscosity of aqueous solutions, poor water solubility, etc., and achieve shortened dissolution time, increased viscosity, The effect of enhancing viscosity

Active Publication Date: 2021-06-08
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] After testing, Welan gum meets most of the above conditions as a water-based fracturing fluid thickener, but due to its poor water solubility and the low viscosity of its aqueous solution, it cannot be used as a fracturing fluid thickener use

Method used

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  • Method for improving viscosity and water solubility of welan gum
  • Method for improving viscosity and water solubility of welan gum
  • Method for improving viscosity and water solubility of welan gum

Examples

Experimental program
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Effect test

Embodiment 1

[0058] In the three flask, the solution was dissolved in water into water into aqueous solution of 12.5 g / L, and stirred with a rotational speed of 500 rpm, which allowed to dissolve well; ethobuly acid and chlorine chlorine chlorine In the methane reaction liquid, wherein the concentration of the tobarate is 50 g / L, the concentration of methanoic acid is 89 g / L, the molar ratio of ethobutone dikoic acid and the methaconic acid is 1.0: 1.2; aqueous solution to the reactant of dichloromethane with a rotary evaporator, aqueous solution of the reactant of dichloromethane, wherein the ethobutylene dikaroic acid is reactive with a molinelobenzoic acid. The concentration is 4.2 g / L, control Weilan gel: Molar ratio of ethobutyne diacolic acid and molinelobenzoic acid reactants 11.62: 12.78; in 30 min olumen acid and methaconic acid The reaction was added dropwise, and then the ring catalyst fluoroboric acid was added dropwise, and the amount was 0.013 g; at normal pressure, 60 ° ...

Embodiment 2

[0060] In the three flask, the solution was dissolved in water into water into aqueous solution of 12.5 g / L, and stirred with a rotational speed of 500 rpm, which allowed to dissolve well; ethobuly acid and chlorine chlorine chlorine In the methane reaction liquid, wherein the concentration of the tobarate is 50 g / L, the concentration of methanoic acid is 89 g / L, the molar ratio of ethobutone dikoic acid and the methaconic acid is 1.0: 1.2; aqueous solution of methylene diagyle with a rotary evaporator with a reactant of dichloromethane with a reactant of methaconic acid, wherein the reactant of maleic acid and methaclic acid and molinelobenzoic acid. The concentration is 3.8 g / L, in which the molar ratio of tobarate and the molinearic acid reactant with methaclic acid and the methacotic acid and the ethobikaric acid and nanchlormonaroxide peroxide were used within 30 min. The reaction material of benzoic acid was added dropwise, and the ring catalytic fluoroboric acid was...

Embodiment 3

[0062] In the three flask, the solution was dissolved in water into water into aqueous solution of 12.5 g / L, and stirred with a rotational speed of 500 rpm, which allowed to dissolve well; ethobuly acid and chlorine chlorine chlorine In the methane reaction liquid, wherein the concentration of the tobarate is 50 g / L, the concentration of methanoic acid is 89 g / L, the molar ratio of ethobutone dikoic acid and the methaconic acid is 1.0: 1.2; aqueous solution to the reactant of dichloromethane with a rotary evaporator, aqueous solution of the reactant of dichloromethane, wherein the ethobutylene dikaroic acid is reactive with a molinelobenzoic acid. The concentration is 4.6 g / L, control of the molar ratio of the reaction liquid of ethobutylene and methanoic acid and methaconic acid; ethylene oxoic acid and methaclic acid and methaconic acid in 30 min The reaction liquid was added dropwise, and the drip catalyst fluoroboric acid was added dropwise, and the amount was 0.014 g;...

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Abstract

The invention discloses a method for improving viscosity and water solubility of welan gum, which comprises the following steps of respectively dissolving butenedioic acid and m-chloroperoxybenzoic acid with a solvent dichloromethane to prepare solutions, mixing a dichloromethane solution of butenedioic acid with a dichloromethane solution of m-chloroperoxybenzoic acid, fully reacting, and removing a solvent dichloromethane to obtain a reaction product A, dissolving welan gum in water to prepare a welan gum aqueous solution, and mixing the reaction product A with a welan gum aqueous solution, adding a ring-opening reaction catalyst fluoboric acid, reacting for 5-10 hours under the conditions of normal pressure, 30-70 DEG C and stirring, collecting a reaction solution, washing the reaction solution with absolute ethyl alcohol, carrying out suction filtration, drying, and crushing to obtain the modified welan gum. The preparation method is environment-friendly and economical, the prepared modified welan gum solves the problem that the welan gum is poor in water solubility, two carboxyl groups are introduced into a modified product at the same time, meanwhile, the viscosity of the modified product is obviously enhanced, and the viscosity is increased compared with that of unmodified welan gum.

Description

Technical field [0001] The present invention is a modified method of microbial polysaccharide, and it is directed to a method of improving the viscosity and water solubility of Weilan. Background technique [0002] The petroleum industry has always been the weight of each country's economic development and industrial production, and oil reserves can even affect some economic trends and international status. my country's land is rich in oil and mines, and the annual mining volume is also very amazing, but due to a large number of usage, my country has a huge oil from abroad. Due to the urgentness of oil resources, improve oil efficiency has become a problem in my country's urgent need. [0003] Weilang gum is a novel polymer polysaccharide polymer produced by a microorganism fermentation with corn starch. The main chain structure of Weilang gum consists of D-glucose, D-glucrate, D-glucose and L-mole unit, by single-stranded L-mannose or single-stranded L-rat lucose The molecular w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/00
CPCC08B37/006
Inventor 郭凯杜进泽方正祝纶宇张东王旭佳蒋敏汤蕊
Owner NANJING UNIV OF TECH