Preparation method of high-viscosity modified guar gum

A manufacturing method and the technology of guar gum, which are applied in the field of manufacturing high-viscosity modified guar gum, can solve the problems of insufficient guar gum viscosity and high water-insoluble content, and achieve low water-insoluble content, fast swelling speed, adaptable effect

Active Publication Date: 2015-04-29
山东德坤工贸有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high-viscosity modified guar gum product produced by this manufacturing method solves the shortcomings of insufficient guar gum viscosity and high water insoluble matter

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The production method of high viscosity modified guar gum is as follows:

[0024] Alkalization reaction: After adding 300 parts of film to the autoclave, keep the temperature at about 50°C, add 30 parts of liquid alkali solution under the protection of 0.03MPa nitrogen, and rotate and stir for 20 minutes;

[0025] Etherification reaction: the pressure was released in a closed vacuum, the temperature was kept at 60 ° C, and 60 parts of etherifying agent were added under the protection of 0.01 MPa nitrogen, and the reaction was carried out for 1 hour;

[0026] Then add 6 parts of carbon dioxide, after stirring for 15 minutes, add 100 parts of tap water and continue to stir for 30 minutes, then the modified guar film is obtained by discharging the material. The purified product is then subjected to super grinding, high-efficiency drying, air vortex micropowder treatment, and vibrating sieve screening to finally obtain products with the following performance indicators:

...

Embodiment 2

[0031] Alkalization reaction: after adding 350 pieces of film to the autoclave, rotate and stir for 25 minutes at a temperature of 55°C and a nitrogen pressure of 0.04 MPa;

[0032] Etherification reaction: the pressure is released in a closed vacuum, the temperature is kept at 65°C, and 70 parts of etherifying agent are added under the protection of 0.02 MPa nitrogen, and the reaction is carried out for 1.5 hours;

[0033] Then add 7 parts of carbon dioxide, and after stirring for 15 minutes, add 120 parts of tap water and continue to stir for 30 minutes. After discharging, the modified guar film is obtained. The modified guar film is added to 3800 parts of washing water, washed and centrifuged to obtain a purified product. Thereafter, the production process is exactly the same as that of Example 1, and will not be repeated, and finally obtain the product of the following performance indicators:

[0034] 1) Apparent viscosity: 7450mPa.s

[0035] 2) Water insoluble matter: 2....

Embodiment 3

[0038] Alkalization reaction: After adding 400 parts of film to the autoclave, under the conditions of temperature of 60°C and nitrogen pressure of 0.05 MPa, add 70 parts of liquid alkali solution, and rotate and stir for 30 minutes;

[0039] Etherification reaction: vacuumize the closed reaction kettle, keep the temperature at 70°C, and add 80 parts of etherifying agent under the protection of 0.03 MPa nitrogen, and react for 2 hours;

[0040] Then add 10 parts of carbon dioxide, and after stirring for 15 minutes, add 150 parts of tap water and continue to stir for 30 minutes, and then the modified guar film is obtained by discharging the material. The production process is exactly the same as in Example 1 thereafter, and will not be repeated, and finally obtain the product of the following performance indicators:

[0041] 1) Apparent viscosity: 7200mPa.s

[0042] 2) Water insoluble matter: 2.2%

[0043] 3) Screening rate: 100% pass 200 mesh, 98% pass 300 mesh

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Abstract

The invention discloses a preparation method of a high-viscosity modified guar gum. The preparation method is characterized by comprising the following steps: adding sheeted guar gum, a liquid alkali, an etherifying agent, carbon dioxide and water into a high-pressure resistant reactor, carrying out alkalization reaction and etherification reaction at a temperature in sections to obtain an modified guar gum, washing and centrifuging the modified guar gum to obtain a purified product, super-grinding the purified product, drying a high speed, micro-grinding under the vortex of airflow, and separating to obtain the finished product which is the high-viscosity modified guar gum. The continuously mixed high-viscosity modified guar gum disclosed by the invention is a white or off-white powder, has the advantages of small particle size and high swelling rate, contains less than 3% of water insoluble matters and has the viscosity of 6,200-7,500mPa.s. In addition, 100% of the high-viscosity modified guar gum can pass a 200-mesh sieve, and 98% of the high-viscosity modified guar gum can pass a 300-mesh sieve.

Description

technical field [0001] The invention relates to a manufacturing method of high-viscosity modified guar gum. Background technique [0002] Guar gum and its derivatives are used as thickeners for fracturing fluids in oil reservoirs, and play a key role in the success of fracturing and in increasing production and efficiency. Most oilfields in China use oilfield fracturing fluids with different properties. In the prior art, modified guar gum products are obtained by modifying the hydrophilic group of guar gum molecules. In many areas, this thickener guar gum product has the following defects when compounding: [0003] 1. The swelling speed in water is slow, and it takes a long time to reach the maximum viscosity; [0004] 2. The use of organic solvents in separation technology pollutes the environment, and the discharge is large; [0005] 3. The guar film has a long time in the modification reaction process, which reduces the molecular weight of guar gum and has a low viscosi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/00
Inventor 李卫国
Owner 山东德坤工贸有限公司
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