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Fenugreek gum containing sulfo carboxymethyl and preparation method and application of fenugreek gum

A technology containing sulfonic acid carboxymethyl group and sulfonic acid carboxymethyl group, which is applied in the field of modified products of natural plant polysaccharides, can solve the problem of no improvement in the salt resistance and temperature resistance of fenugreek gum, and the chemical modification of fenugreek gum. low solubility, shorten the dissolution time, etc., to achieve the effect of low water insoluble content, fast dissolution speed and good salt tolerance

Inactive Publication Date: 2017-02-22
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are few chemical modifications of fenugreek gum in China
In 2015, Huan Cancan introduced the method of carboxymethyl-modified fenugreek gum and its application as a thickener in fracturing fluids. By introducing a hydrophilic group carboxymethyl group into the molecular chain of guar gum, it improved the quality of fenugreek gum. The solubility of collagen powder shortens the dissolution time and reduces the residue content after breaking the gel; the carboxymethyl active group is the basis of the cross-linking reaction, which can enhance the temperature resistance and shear resistance of the fracturing fluid jelly, but the fenugreek gum Salt resistance and temperature resistance are still not improved

Method used

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  • Fenugreek gum containing sulfo carboxymethyl and preparation method and application of fenugreek gum
  • Fenugreek gum containing sulfo carboxymethyl and preparation method and application of fenugreek gum
  • Fenugreek gum containing sulfo carboxymethyl and preparation method and application of fenugreek gum

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Effect test

preparation example Construction

[0045] The preparation method of the sulfonic acid group-containing carboxymethyl fenugreek gum includes the following steps:

[0046] (1) Add 100g of carboxymethyl fenugreek gum to 1L of alcohol aqueous solution;

[0047] (2) Blow in nitrogen, add aqueous sodium hydroxide solution (with sodium hydroxide content of 1g-3g) dropwise while stirring for 0.5h; then stir and heat up to 60-80°C, add 0.03g-0.6g sulfuric acid dropwise Chemical agent, the dropping time is 1h, and the reaction is 2-4 hours after the dropping, preferably 3 hours;

[0048] (3) Acid adjust the reaction solution to neutrality, filter, and vacuum dry to obtain light yellow powder, which is sulfonic acid group-containing carboxymethyl fenugreek gum.

[0049] In step (1):

[0050] The aqueous alcohol solution is an aqueous ethanol solution with a mass fraction of 50%-80%, preferably 50%;

[0051] The mass fraction of the sodium hydroxide aqueous solution is 5%-30%, preferably 10%.

[0052] In step (2), the sulfonating age...

Embodiment 1

[0087] The preparation method of sulfonic acid modified carboxymethyl fenugreek gum, the steps are as follows:

[0088] (1) Add 100.0g of carboxymethyl fenugreek gum to a 1L 50% ethanol solution reactor;

[0089] (2) Under nitrogen environment, add 10.0g 10% sodium hydroxide aqueous solution dropwise, add dropwise for 0.5h, then raise the temperature to 70℃, stir for 0.5 hour, add dropwise 3.0g 10% sodium 3-chloro-2-hydroxypropanesulfonate solution, Constant temperature 60℃, 1h dripping is completed, continue to stir for 2 hours;

[0090] (3) The reaction liquid is neutralized to neutrality, filtered, and dried in vacuum to obtain the light yellow powder product SCFG-1.

[0091] Product performance test results:

[0092] The degree of substitution (DS) of the product SCFG-1 is 0.020.

[0093] The water-insoluble content of the product SCFG-1 is 8.3%.

[0094] The crystallinity of the product SCFG-1 decreases, and the introduction of sulfonic acid groups will reduce the order of molecular...

Embodiment 2

[0099] The preparation method of sulfonic acid modified carboxymethyl fenugreek gum, the steps are as follows:

[0100] (1) Add 100.0g of carboxymethyl fenugreek gum to a 1L 50% ethanol solution reactor;

[0101] (2) In a nitrogen environment, add 15.0g of 10% sodium hydroxide aqueous solution dropwise, add dropwise for 0.5h, then raise the temperature to 85℃, stir for 0.5 hour, dropwise add 30g of 10% sodium 3-chloro-2-hydroxypropanesulfonate solution, After 1h dripping is completed, continue to stir for 2 hours;

[0102] (3) The reaction liquid is neutralized to neutrality, filtered, and dried in vacuum to obtain the light yellow powder product SCFG-2.

[0103] Product performance test results:

[0104] The degree of substitution (DS) of the product SCFG-2 is 0.22.

[0105] The water-insoluble content of the product SCFG-2 is 4.8%; compared with Example 1, the water-insoluble content is reduced.

[0106] The crystallinity of the product SCFG-2 is 1.30%.

[0107] The apparent viscosity o...

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Abstract

The invention relates to fenugreek gum containing sulfo carboxymethyl and a preparation method and application of the fenugreek gum. Currently fenugreek gum is rarely chemically modified, and the salt resistance and temperature resistance of the fenugreek gum are not improved. Carboxymethyl fenugreek gum is added into an alcohol-water solution; nitrogen is introduced, and a sodium hydroxide water solution is dropwise added while stirring is carried out; stirring and temperature raising are carried out, and a sulfonating agent is dropwise added for reacting; the reaction solution is adjusted to be neutral with acid, filtering and vacuum drying are carried out, and faint yellow powder, namely the fenugreek gum containing sulfo carboxymethyl, is obtained. The carboxymethyl fenugreek gum is modified with sulfo groups, therefore, the content of insoluble matter can be reduced, and residue content obtained after gum breaking can be reduced; fracturing fluid formed by the sulfonic acid modified carboxymethyl fenugreek gum can show good temperature resistance, shear resistance and salt resistance.

Description

Technical field [0001] The invention relates to a modified product of natural plant polysaccharides, in particular to a sulfonic acid group-containing carboxymethyl fenugreek gum, and a preparation method and application thereof. Background technique [0002] Fenugreek gum is a natural polymer compound. Its structural backbone is a linear polysaccharide composed of β-D-mannose residues connected with 1,4-glycosidic bonds, and its side chain is composed of α-D-galactose residues. Through 1,6-glycosidic bond and C of mannose in the main chain 6 Connected, the molar ratio of galactose to mannose is 1:1.2 in fenugreek gum, 1:4 in soap nut gum, and 1:2 in guar gum. The proportion of galactose is higher. The cross-linked ortho-hydroxyl group is large, the cross-linking density is high, and the gel with high viscoelasticity is generated, which is used in fracturing and increasing production. However, fenugreek collagen powder has the disadvantages of slow dissolution rate, high water-i...

Claims

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Application Information

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IPC IPC(8): C08B37/00C09K8/68
CPCC08B37/0087C09K8/685C09K8/887
Inventor 沈一丁秋列维王晨杨晓武李培枝
Owner SHAANXI UNIV OF SCI & TECH
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