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Method for preparing hydrophobically modified xanthan

A technology of hydrophobic modification and xanthan gum, which is applied in the field of preparation of hydrophobic modified xanthan gum, can solve the problems of high cost of environmental protection wastewater treatment, poor salt resistance and temperature resistance, difficult wastewater treatment, etc., and achieve high yield, Good salt resistance, convenient storage effect

Active Publication Date: 2014-04-16
烟台东方神州生物技术有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

But its salt resistance is relatively poor in terms of temperature resistance
In order to improve the salt resistance of xanthan gum, Chinese patent document CN102134283A discloses a preparation method of associative modified xanthan gum, the modifier is chlorinated hydrocarbon (benzyl chloride) containing benzene ring, because it contains The benzene ring structure is easy to cause huge pollution to the environment; another shortcoming of this technology is that the resulting hydrophobic association xanthan gum is used for oil recovery and the viscosity is still as high as 156mPas after 90 days of high-temperature aging under the formation. Its high viscosity makes it difficult to treat the waste water produced, and the cost of environmental protection treatment of waste water is relatively high

Method used

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  • Method for preparing hydrophobically modified xanthan
  • Method for preparing hydrophobically modified xanthan
  • Method for preparing hydrophobically modified xanthan

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Under the condition of stirring at room temperature, add 0.192 g of 30% mass concentration ammonium dodecyl ammonium sulfate solution to 8 g of water / isopropanol (1:4 mass ratio) mixed solvent, pass N 2 After bubbling for 15 minutes, add 1g of tetradecane bromide and 0.15g of solid sodium hydroxide in turn, then add 4g of xanthan gum (the content of active ingredients is 89.1%), and continue to pass N 2 Bubble for 5min. 70°C constant temperature reaction for 7 hours. The resulting reaction solution was poured into absolute ethanol, and a solid was precipitated. The solid product was precipitated and washed three times with 90 wt % ethanol aqueous solution, filtered with suction, and dried at a constant temperature at 30° C. for 72 hours. 3.89 g of hydrophobically modified xanthan gum was obtained. According to static light scattering test, its molecular weight is 6.06 million. The infrared spectrum of gained hydrophobically modified xanthan gum is as follows: figure...

Embodiment 2

[0041] As described in Example 1, the difference is that the amount of xanthan gum added is 2 g to obtain 1.87 g of hydrophobically modified xanthan gum.

Embodiment 3

[0043] As described in Example 1, the difference is that the amount of tetradecane bromide added is 0.5 g to obtain 3.87 g of hydrophobically modified xanthan gum.

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Abstract

The invention relates to a method for preparing hydrophobically modified xanthan. The method comprises the following steps: taking water / iso-propyl alcohol mixing liquid as a solvent, taking ammonium lauryl sulfate as an emulsifying agent, taking alkyl bromide as an etherifying agent, and carrying out reaction under the temperature of 30 to 120 DEG C and the pH of 6 to 9 to modify xanthan to obtain the hydrophobically modified xanthan. The conditions of a synthesis reaction are wild, raw materials are easy to obtain, monomer conversion is high, and products are convenient to process. The hydrophobically modified xanthan still has higher viscosity when the xanthan has lower molecular weights, has good salt resistance, has good degradable performance so as to be convenient to perform subsequent sewage treatment, and has good environment affinity. The method is suitable for the oil extraction production of high salinity oil reservoirs.

Description

technical field [0001] The invention relates to a method for preparing hydrophobically modified xanthan gum, which belongs to the technical field of polymer chemistry and polymer modification. Background technique [0002] Xanthan gum is currently the bio-glue with the most superior performance in the world, which integrates thickening, suspension, emulsification and stabilization. The number of pyruvate groups at the molecular side chain end of xanthan gum has a great influence on its performance. Xanthan gum has the general properties of long-chain polymers, but it contains more functional groups than general polymers, and it will show unique properties under specific conditions. Its conformation in aqueous solution is diverse, and it exhibits different properties under different conditions. [0003] At present, xanthan gum has been widely used in tertiary oil recovery. The viscosity of xanthan gum solution will not change greatly with the change of temperature. The vis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/00
Inventor 谭业邦王小金辛海鹏
Owner 烟台东方神州生物技术有限公司
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