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Method for demulsifying oil-in-water emulsion

An oil-in-water, emulsion technology, applied in the field of petroleum additives, to achieve the breakthrough of unclear oil-water interface, strong adsorption capacity, and high demulsification rate

Active Publication Date: 2019-02-22
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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

Method used

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  • Method for demulsifying oil-in-water emulsion
  • Method for demulsifying oil-in-water emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1: Amphiphilic hyperbranched polyethyleneimine modification (HPEI-br-C 12 )preparation

[0037] Dissolve 3.14g of HPEI in 20mL of methanol, inject a small amount of glacial acetic acid and stir to mix, then add 1.8mL of lauric aldehyde, and react at room temperature for 0.5h. Weigh 3g of sodium triacetoxyborohydride (STAB) into the reaction system, react at room temperature for 12h, and obtain a crude product with a high degree of polymerization; subsequently, the crude product is concentrated and cooled to room temperature, extracted three times with dichloromethane, and rotary evaporated You can get HPEI-br-C 12 .

[0038] Amphiphilic hyperbranched polyethyleneimine (HPEI-br-C 12 ) structure diagram, such as figure 1 As shown, it should be noted that since the hyperbranched structure is variable and complex, the structure shown is only an example.

Embodiment 2～4

[0039] Embodiment 2~4: Amphiphilic hyperbranched polyethyleneimine modification (HPEI-br-C 12 )preparation

[0040] Reference Example 1 is used to prepare the amphiphilic hyperbranched polyethyleneimine modified product, and the specific process parameters are as shown in Table 1, and the amphiphilic hyperbranched polyethyleneimine modified product (HPEI-br-C 12 ).

[0041] Table 1: Comparison of preparation process parameters in Examples 1 to 4

[0042]

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Abstract

The invention relates to a method for demulsifying oil-in-water emulsion. The method comprises the following steps: 1) carrying out an aldimine condensation reaction on lauric aldehyde and hyperbranched polyethyleneimine, and performing reductive amination to obtain amphipathic hyperbranched polyethyleneimine modifier, wherein a feed ratio of the lauric aldehyde to hyperbranched polyethyleneimineis (1-6ml):(2-6g); the core of the amphipathic hyperbranched polyethyleneimine modifier is hyperbranched polyethyleneimine with strong hydrophilic property, and the shell is composed of oleophilic dodecyl and hydrophilic amino; and 2) dispersing the amphipathic hyperbranched polyethyleneimine modifier into the oil-in-water emulsion for demulsifying. According to the method, the oil content of an aqueous phase of the oil-in-water emulsion is less than 5% in a short time, the moisture content of an oil phase can be reduced to 0.1% or less, the residual emulsion layer is extremely thin even disappears, and a clear oil-water interface is formed.

Description

technical field [0001] The invention relates to the technical field of petroleum additives, in particular to a method for demulsifying oil-in-water emulsions. Background technique [0002] Hyperbranched polyethyleneimine (HPEI) is a class of hyperbranched polymers (Hyperbranched polymers) that have been studied relatively maturely, are cheap, and have been produced industrially. HPEI is a highly branched polymer with a viscous liquid that has very little viscosity in solvents. Compared with other polymers, it has good thermal stability. Thermogravimetric analysis shows that it does not decompose in air below 300°C, has good solubility, and has a large number of amino groups at the end of the branch chain. [0003] Due to its novel structure, unique performance and potential application prospects, this kind of polymer has been widely concerned by the scientific and industrial circles once it comes out. In terms of grafting, hyperbranched polymers that meet people's needs ca...

Claims

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Application Information

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IPC IPC(8): C10G33/04
CPCC10G33/04
Inventor 闫澍何桂金李亚应好叶灯枫方文军郭永胜赵辉
Owner ZHEJIANG UNIV
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