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CO2 emulsion and preparation method thereof

A technology of CO2 and emulsion, applied in mixing methods, chemical instruments and methods, dissolution, etc., can solve problems such as expensive surfactants, poor emulsion stability, and harsh emulsion preparation conditions

Active Publication Date: 2013-06-12
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Currently, CO 2 The preparation of emulsions mostly uses fluorinated surfactants, which are expensive; and the current emulsion preparation conditions are relatively harsh, and its industrial applicability is not strong
For example, Dhanuka produced CO at 25 °C, 20.7 MPa and 34.5 MPa 2 with H 2 A high concentration of CO with a mass ratio of O of 90:10 2 / H 2 O emulsion, which was found to be stable for 2 hours, after which the continuous phase settled (Dhanuka VV, Dickson JL, Ryoo W et al. High internal phase CO 2 -in-water emulsions stabilized with a branched nonionic hydrocarbon surfactant. Journal of colloid and interface science, 2006, 298: 406-418.); Dhanuka used TMN-6 (isomeric alcohol ethoxylate) to generate H 2 O / CO 2 Emulsion and CO 2 / H 2 O emulsion, it was found that at 25°C, 6.9MPa, 50wt% CO 2 , 5wt% TMN-6 conditions, the system is easy to form CO 2 / H 2 O emulsion, but the emulsion formed under this condition can only exist stably for 15 minutes
According to the literature survey, the currently obtained CO 2 Emulsions have the following disadvantages: first, the preparation of CO 2 The surfactant of the emulsion is expensive, and it is not a product of large-scale industrial production; second, the CO prepared under low pressure 2 Poor emulsion stability
These problems greatly limit the CO 2 Application field and scope of emulsion

Method used

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  • CO2 emulsion and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0075] SDS and Tween 80, whose mass fractions are 0.5wt% and 5wt% respectively, are the compounded surfactants described in the present invention. Liquid CO 2 The volume ratio with water is 2:1; CO 2 The preparation temperature of the emulsion is 288.2K; the preparation pressure is 12MPa, filled with CO 2 , the stirring speed is 1300r / min. CO 2 The emulsion can exist stably for 180min, which shows that the emulsification effect of the compound surfactant of the present invention is very good.

Embodiment 2

[0077] The mass fractions of SDS and Tween 80 are respectively 0.5wt% and 5wt%, which are the compounded surfactants described in the present invention. Liquid CO 2 The volume ratio with water is 1.5:1, CO 2 The preparation temperature of the emulsion is 288.2K, the preparation pressure is 12MPa, and the stirring speed is 1200r / min. CO 2 The emulsion can exist stably for 300 minutes, and the relationship between the droplet size distribution of the emulsion and time during the process of stopping stirring is as follows: figure 1 shown. It can be seen that the distribution curve of the emulsion droplets does not change much with time, which shows that the emulsion formed by the present invention has better stability.

Embodiment 3

[0079] The mass fractions of SDS and Tween 80 are respectively 0.5wt% and 5wt%, which is the compounded surfactant of the present invention. Liquid CO 2 The volume ratio with water is 3.5:1, CO 2 The preparation temperature of the emulsion is 288.2K, and the preparation pressure is 12MPa. The emulsion droplet size distribution is as figure 2 As shown, wherein, the straight line indicates that the stirring speed is 800r / min, and the dotted line indicates that the stirring speed is 1200r / min. CO 2 The emulsion can exist stably for 210 minutes. It can be seen from the figure that the distribution of the emulsion at high stirring speed is more uniform and stable, and the droplet radius is smaller.

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Abstract

The invention provides CO2 emulsion and a preparation method thereof. The emulsion comprises the following components: CO2, lauryl sodium sulfate, other surfactants and water, wherein based on 100 percent of water quality, the lauryl sodium sulfate has the mass percent concentration of 0.001-1 percent; the other surfactants have the mass percent concentration of 0-10.0 percent, preferably 3.0-7.0 percent; and the volume ratio of CO2 to water based on liquid CO2 is (1-5):1. According to the emulsion, the preparation cost and preparation conditions of the CO2 emulsion can be greatly reduced; and meanwhile, the research proves that the CO2 emulsion can be stabilized for more than several hours.

Description

technical field [0001] The invention relates to the technical field of emulsion preparation, specifically, the invention relates to a CO 2 Emulsion and method for its preparation. Background technique [0002] Emulsions are widely used in industrial production and daily life, such as household detergents, industrial detergents, medical equipment cleaning agents, cosmetics and pharmaceutical industries, food industry, paper industry, textile industry, petroleum industry, metal processing industry, etc. field. Although there are many studies and applications of conventional emulsions at present, people are still interested in CO 2 / H 2 Compared with conventional emulsion systems, the understanding and understanding of the emulsification and foaming properties of O emulsion systems is only in its infancy. The non-flammable, non-toxic and environmentally benign properties of these "green" emulsions are of very attractive value. water and CO 2 The formed emulsion can be div...

Claims

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Application Information

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IPC IPC(8): B01F3/04
Inventor 孙长宇李实张可刘蓓陈光进袁青马政伟曾新阳王晓辉王雪
Owner PETROCHINA CO LTD
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