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One-step etherification method for preparing carboxymethyl hydroxyalkyl guar gum powder

The technology of carboxymethyl hydroxyalkyl guar powder and guar film is applied in the field of preparation of carboxymethyl hydroxyalkyl guar, and can solve the problems of damage, high toxicity of chloroacetic acid, high equipment corrosion and the like, To achieve the effect of shortened reaction time, good cross-linking performance, and reduced reaction steps

Active Publication Date: 2017-01-18
山东广浦生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] "Study on the Synthetic Process of Carboxymethyl Hydroxypropyl Guar Gum" published in Volume 21, Issue 2 of "Chemical Times", the method reported uses chloroacetic acid as the carboxymethylated etherification agent, and chloroacetic acid is more toxic Contact or inhalation of its high-concentration steam will cause great harm to the body; in addition, it is highly acidic and highly corrosive to equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Add 100 g of guar gum flakes to a reaction kettle equipped with a mechanical stirrer, a thermometer, and a dropping funnel, add 40 g of 25 wt % sodium hydroxide aqueous solution, and heat up to 45° C. for alkalization for 2 min. At the same time, 50 g of 25% sodium chloroacetate solution and 30 g of propylene oxide were added, the temperature was kept at 45°C, and the reaction was timed for 120 minutes. After the reaction, the temperature was lowered to 30°C, washed with 80% aqueous methanol solution, pulverized and dried to obtain the finished product.

[0030] The carboxymethyl molar substitution degree of the obtained product is 0.12; the hydroxypropyl molar substitution degree is 0.44.

Embodiment 2

[0032] Add 100 g of guar gum flakes to a reaction kettle equipped with a mechanical stirrer, a thermometer, and a dropping funnel, add 80 g of 30 wt % sodium hydroxide aqueous solution, and heat up to 80° C. for alkalization for 60 min. At the same time, 16 g of 33.3 wt % sodium chloroacetate solution and 5 g of propylene oxide were added, kept at 80° C., and reacted by timing for 30 min. After the reaction, cool down to 40°C, wash with 80% isopropanol aqueous solution, pulverize and dry to obtain the finished product.

[0033] The molar substitution degree of the carboxymethyl group of the obtained product is 0.05; the molar substitution degree of the hydroxypropyl group is 0.05.

Embodiment 3

[0035] Add 100 g of guar gum flakes and 120 g of 26.7 wt % sodium hydroxide aqueous solution into a reaction kettle equipped with a mechanical stirrer, a thermometer and a dropping funnel, and perform an alkalization reaction at room temperature at 20° C. for 2 min. At the same time, 240 g of 16.7% sodium chloroacetate solution and 100 g of propylene oxide were added, the temperature was raised to 80° C., and the reaction was timed for 80 minutes. After the reaction, cool down to 30°C, wash with 80% ethanol aqueous solution, pulverize and dry to obtain the finished product.

[0036] The molar substitution degree of the carboxymethyl group of the product obtained is 0.2; the molar substitution degree of the hydroxypropyl group is 0.9.

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Abstract

The invention discloses a method for preparing carboxymethyl hydroxyalkyl guar gum powder by virtue of one-step etherification. The method comprises the following steps: adding an alkalizer aqueous solution into guar gum slices to perform alkalization reaction, then synchronously adding a carboxymethylated etherifying agent and a hydroxyalkylated etherifying agent by virtue of one step after the alkalization reaction ends, and performing after-treatment to obtain a finished product after reaction ends. The method disclosed by the invention adopts the cheap guar gum slices as raw materials, also is added with the carboxymethylated etherifying agent and the hydroxyalkylated etherifying agent to perform modification, can be used for greatly shortening the reaction time and reducing the reaction processes compared with a fractional step method, and is simple and convenient to operate; the method does not use an organic solvent as a carrier in a reaction process, can be used for greatly reducing the consumption of the organic solvent, and is lower in cost and more environment-friendly in production process; and an obtained product disclosed by the invention is low in content of water insoluble matters and good in crosslinking performance, has very good joint forming and sand carrying functions, and has very good application prospects in the fields of oil field fracturing fluids and oil field auxiliary agents.

Description

technical field [0001] The invention relates to a preparation method of carboxymethyl hydroxyalkyl guar gum, in particular to a method for preparing carboxymethyl hydroxyalkyl guar gum powder through one-step etherification. Background technique [0002] Guar gum is a plant gum that is isolated, extracted and purified from the endosperm of guar beans widely planted in India and Pakistan. Its main component is galactomannan, which is a non-ionic polysaccharide in terms of its molecular structure. The main chain is composed of mannose, connected by 1 and 4 positions, and the side chain is composed of galactose. 6 keys are connected with the main chain. The ratio of mannose to galactose is about 2:1, and the ratio of the two varies slightly depending on the origin. The relative molecular weight of guar gum is generally 200,000-2 million. Guar gum is a good natural water-soluble thickener. It is one of the best water-soluble natural polymer compounds known so far. It is widely...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B37/00
Inventor 宋纯亮倪佳倩吴曙光朱虎
Owner 山东广浦生物科技有限公司
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