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Method for preparing high viscosity polyanionic cellulose

A polyanion and cellulose technology, applied in the field of polyanion cellulose preparation, can solve the problems of high fluid loss, poor salt tolerance, low viscosity of polyanion cellulose, etc.

Inactive Publication Date: 2010-09-22
上海长光企业发展有限公司
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  • Abstract
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  • Claims
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Problems solved by technology

[0010] The purpose of the present invention is to propose a method for preparing high-viscosity polyanion cellulose, so as to solve the problems of low viscosity, poor salt tolerance and high fluid loss of the polyanion cellulose obtained by the existing polyanion cellulose preparation method

Method used

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  • Method for preparing high viscosity polyanionic cellulose
  • Method for preparing high viscosity polyanionic cellulose
  • Method for preparing high viscosity polyanionic cellulose

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preparation example Construction

[0025] see figure 1 . The preparation method of high-viscosity polyanionic cellulose specifically comprises the following steps:

[0026] 1) Premixing: In the kneader, add solid alkali, liquid alkali and alcohol, premix for 10min-30min, so that the solid alkali is basically dissolved in liquid alkali and alcohol. The use of alkali in two forms of matter is mainly to control the moisture in the reaction and reduce the occurrence of side reactions.

[0027] 2) Feeding: After premixing, put the shredded refined cotton into the kneader. The average degree of polymerization of the refined cotton is 2000-4000.

[0028] 3) Alkalinization of cellulose: Add liquid caustic soda and alcohol into the kneader by spraying for alkalization of cellulose. During the entire alkalization process, the cooling water is used to control the temperature at 15°C-40°C. N 2 Protection, alkalization time is 30min-80min.

[0029] 4) Mixing of cellulose with etherification agent: add chloroacetic acid...

Embodiment 2

[0059] The preparation method of high-viscosity polyanionic cellulose specifically comprises the following steps:

[0060] 1) Premixing: In the kneader, add 644g of liquid caustic soda with a concentration of 48.5%, 1300ml of alcohol with a concentration of 93% and 170g of solid caustic, and premix at a temperature of 20°C-40°C for 20 minutes to make the solid alkali basically Dissolve in caustic soda and alcohol.

[0061] 2) Feeding: After premixing, put 1200g of shredded refined cotton into the kneader. The average degree of polymerization of the refined cotton is 2000-4000.

[0062] 3), alkalization of cellulose: by spraying, 600g concentration is 48.5% liquid caustic soda and 1200ml concentration is 93% alcohol to join in the kneader, carry out the alkalization of cellulose, pass through in the whole alkalization process Control the temperature of cooling water at 15°C-40°C, pass N 2 Protection, alkalization time is 50min.

[0063] 4) Mixing of cellulose with etherifyin...

Embodiment 3

[0073] The preparation method of high-viscosity polyanionic cellulose specifically comprises the following steps:

[0074] 1) Premixing: In the kneader, add 626g of liquid caustic soda with a concentration of 49.5%, 1200ml of alcohol with a concentration of 95% and 170g of solid caustic, and premix at 20°C-40°C for 15 minutes to make the solid alkali basically Dissolve in caustic soda and alcohol.

[0075] 2) Feeding: After premixing, put 1200g of shredded refined cotton into the kneader. The average degree of polymerization of the refined cotton is 2000-4000.

[0076] 3), cellulose alkalization: 600g concentration is 49.5% liquid caustic soda and 1200ml concentration is 95% alcohol to join in the kneader by the mode of spraying, carries out the alkalization of cellulose, pass through in the whole alkalization process Control the temperature of cooling water at 15°C-40°C, pass N 2 Protection, alkalization time is 60min.

[0077] 4) Mixing of cellulose with an etherifying ag...

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Abstract

The invention discloses a method for preparing high viscosity polyanionic cellulose, comprising the following steps with refined cotton as the cellulose raw material of alkalizing cellulose, mixing cellulose by adding an etherifying agent, etherifying cellulose, neutralizing and washing, and performing post treatment of the product; and the preparation method further comprises the step of crosslinking reaction which is performed between the step of etherifying cellulose and the step of neutralizing and washing by adding a crosslinking agent N,N'-methylene-bis-acrylamide into polyanionic cellulose to perform crosslinking reaction. The invention is a solution to the problem that the polyanionic cellulose obtained by the traditional method for preparing high viscosity polyanionic cellulose has low viscosity, poor salt tolerance and high filtration loss.

Description

technical field [0001] The invention relates to a preparation method of polyanion cellulose, in particular to a preparation method of high viscosity polyanion cellulose. Background technique [0002] Polyanionic cellulose (PAC) has outstanding properties such as thickening, suspension, dispersion, and water loss retention. It is widely used in many industrial sectors, mainly as a thickener in brine, especially in continental shelves and offshore oil mining sites. Among the mud treatment agents used, it is used in drilling, well completion, cementing and fracturing processes, and its performance is very good. With the expansion of the field of oil exploration and the increase of drilling depth, the formation encountered is becoming more and more complex, and various mud treatment agents are required. Therefore, the quality requirements for polyanionic cellulose are constantly increasing, and polyanionic cellulose is required to have high viscosity. Salt resistance, calcium r...

Claims

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Application Information

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IPC IPC(8): C08B15/10C08B11/00
Inventor 丁长光王文涛朱宏彬袁和平丁长银聂熙金
Owner 上海长光企业发展有限公司
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