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Method for demulsification of oil-in-water emulsion by using amphiphilic hyperbranched polyethyleneimine

A polyethyleneimine, oil-in-water technology, used in the field of petroleum additives to achieve the effect of strong adsorption capacity and high demulsification rate

Active Publication Date: 2019-02-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing branched demulsifiers can only achieve a good deoiling rate of the water phase while the oil phase is still in the state of emulsion

Method used

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  • Method for demulsification of oil-in-water emulsion by using amphiphilic hyperbranched polyethyleneimine
  • Method for demulsification of oil-in-water emulsion by using amphiphilic hyperbranched polyethyleneimine
  • Method for demulsification of oil-in-water emulsion by using amphiphilic hyperbranched polyethyleneimine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: Amphiphilic hyperbranched polyethyleneimine (HPEI-g-C 16 )preparation

[0035] Dissolve 2.78g of palmitic acid in 30mL of chloroform, weigh 1.77g of CDI into the reaction system, stir until it dissolves, and obtain a mixed solution of palmitic acid. Dissolve 2.5g of HPEI in 10mL of chloroform, then add it dropwise into the palmitic acid mixture, and carry out amidation reaction at 55°C for 9 hours to obtain a crude product with a high degree of polymerization; subsequently, crude After the product was cooled to room temperature, it was poured into 250mL acetone and stirred for 60 minutes. It was observed that the yellow transparent viscous liquid sank to the lower layer. The upper layer of acetone was discarded, and the precipitation was repeated twice. The HPEI-g-C could be obtained by rotary evaporation at 50°C under vacuum. 16 .

[0036] Amphiphilic hyperbranched polyethyleneimine (HPEI-g-C 16 ) structure diagram as figure 1 As shown, it should be n...

Embodiment 2～7

[0038] Refer to Example 1 to prepare amphiphilic hyperbranched polyethyleneimine. The specific process parameters are shown in Table 1, and amphiphilic hyperbranched polyethyleneimine can be obtained.

[0039] Table 1: Comparison of preparation process parameters of Examples 1 to 7

[0040]

[0041] Wherein, the amphiphilic hyperbranched polyethyleneimine (HPEI-g-C prepared in embodiment 2 12 ) structure diagram as figure 2 As shown, it should be noted that since the hyperbranched structure is variable and complex, the structure shown is only an example.

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Abstract

The invention relates to a method for demulsification of an oil-in-water emulsion by using amphiphilic hyperbranched polyethyleneimine, comprising the following steps: 1) carrying out an amidation reaction between C10-C18 saturated fatty acid and hyperbranched polyethyleneimine to obtain amphiphilic hyperbranched polyethyleneimine, wherein the hydrophilic tight core of the amphiphilic hyperbranched polyethyleneimine is hyperbranched polyethyleneimine and the shell is composed of a lipophilic long-chain alkyl group and a hydrophilic amino group, and the mass ratio of the saturated fatty acid tothe hyperbranched polyethyleneimine is 0.5-2; and 2) dispersing the amphiphilic hyperbranched polyethyleneimine in an oil-in-water emulsion for demulsification. By the above method, the oil content of a water phase of the oil-in-water emulsion is lower than 10%, and the water content of an oil phase of the oil-in-water emulsion can be as low as 0.1% and below, thereby forming a clear oil-water interface.

Description

technical field [0001] The invention relates to the field of petroleum additives, in particular to a method for demulsifying oil-in-water emulsions by using amphiphilic hyperbranched polyethyleneimine. Background technique [0002] Crude oil is a multi-component mixture, and the water contained in it exists in an emulsified state. A stable emulsion is formed between water and oil, and it is difficult for water to settle down automatically. In order to destroy their stable emulsified state, the method of adding crude oil demulsifier is adopted in the dehydration process. With the continuous deepening of oilfield exploitation technology, major oilfields have entered the stage of tertiary oil recovery one after another, and oil resources are decreasing day by day. O / W) type emulsions, and due to the wide application of chemical flooding methods, the stability of crude oil emulsions has gradually increased, and the treatment of produced fluids has become a technical problem in ...

Claims

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Application Information

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IPC IPC(8): C10G33/04
Inventor 闫澍张丽锋何桂金应好戴怿童方文军郭永胜赵辉
Owner ZHEJIANG UNIV