Carbon dioxide soluble zwitterionic surfactant and preparation method thereof

A surfactant, carbon dioxide technology, applied in the preparation of ether from alkylene oxide, chemical instruments and methods, preparation of organic compounds, etc., can solve the problems of high price, insoluble in water phase, low solubility of carbon dioxide, etc. It has the effect of solubility, low product price, good hydrophilic and carbon dioxide-friendly properties and resistance to hard water.

Active Publication Date: 2017-05-03
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Chinese patent CN102337874A discloses an oil-soluble surfactant for carbon dioxide flooding, which is n-butyl citrate and n-octyl citrate. These surfactants are slightly soluble in carbon dioxide, but cannot be dissolved in water phase
[0009] But looking at these surfactants, there are certain deficiencies, such as high price or low solubility in carbon dioxide.

Method used

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  • Carbon dioxide soluble zwitterionic surfactant and preparation method thereof
  • Carbon dioxide soluble zwitterionic surfactant and preparation method thereof
  • Carbon dioxide soluble zwitterionic surfactant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The synthesis of embodiment 1 surfactant

[0035] The synthesis of alkyl polyoxyalkyl ether: add 20.0 g isooctyl alcohol and catalyst 1.0 g KOH in autoclave, with N 2 Replace the air in the kettle for 3 times, heat the kettle to 80°C, add 53.4g of propylene oxide after vacuum removal, heat to 160°C for ring-opening polymerization for 3 hours, then continue to add 13.5g of ethylene oxide to react for 2 hours, after the end Open the kettle to lower the temperature, and discharge the product to obtain the product.

[0036] Synthesis of alkyl polyoxyalkyl ether carboxylic acid: Add 56.6 g (0.10 mol) of alkyl polyoxyalkyl ether product and 10.0 g (0.1 mol) of solid succinic anhydride into a three-neck flask, and pass nitrogen gas at the reflux condenser Protect, stir and heat to 90°C. After 3 hours of reaction, the succinic anhydride solid disappears, and the product is obtained by cooling down.

[0037] Amidation reaction: Add 66.6 g (0.1 mol) of alkyl polyoxyalkyl ether ...

Embodiment 2-7

[0039] Examples 2-7 Solubility test of surfactants in carbon dioxide.

[0040] Take 0.15, 0.20, 0.25, 0.30, 0.35, and 0.40 g of the surfactant products in Example 1, respectively, and add them to a high-pressure reaction kettle with a glass window in sequence, feed carbon dioxide to 20 MPa, heat to 40°C, and fine-tune the pressure To 25.0 MPa, the supercritical carbon dioxide is 120.5 g at this time calculated by the volume of the reactor. Start the mechanical stirring and observe the dissolution of the solid surfactant.

[0041] Example Surfactant quality Surfactant concentration (wt%) Dissolution 2 0.15 0.12 Completely dissolved, clear and transparent 3 0.20 0.17 Completely dissolved, clear and transparent 4 0.25 0.21 Completely dissolved, clear and transparent 5 0.30 0.25 Completely dissolved, clear and transparent 6 0.35 0.29 Completely dissolved, clear and transparent 7 0.40 0.33 The solution is cloudy and ins...

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Abstract

The invention belongs to the field of special surfactants and particularly relates to a carbon dioxide soluble zwitterionic surfactant and a preparation method thereof. The surfactant is structurally characterized in that a carbon dioxide-philic branched alkylene oxide group, an ester group characteristic group and a hydrophilic glycine betaine group are introduced into a hydrophobic chain, so that the surfactant has good carbon dioxide-philic and hydrophilic properties and also has high-salinity hard water resistance. According to the preparation method of the surfactant disclosed by the invention, alkyl alcohol serves as an initiator to cause epoxyalkane aggregation, and the final product is obtained through the anhydride esterification, amidation of N,N-dimethylaminopropylamine and sodium chloroacetate quaterisation reaction. The surfactant has the following advantages that (1) the synthetic route is mature and easy to implement, and (2) the surfactant has high solubleness in supercritical or liquid-phase carbon dioxide.

Description

technical field [0001] The invention belongs to the field of surfactants, in particular to a carbon dioxide-soluble zwitterionic surfactant with alkylene oxide and betaine groups and a preparation method thereof. Background technique [0002] Surfactants generally improve the compatibility of two immiscible substances, a property determined by their specific structure. Generally, surfactant molecules are composed of non-polar lipophilic (hydrophobic) groups and highly polar hydrophilic (oleophobic) groups, and the two parts are located at both ends to form an asymmetric structure. . [0003] For carbon dioxide, if an emulsion or foam of carbon dioxide and water or an organic solvent is formed, one end of the surfactant is required to be soluble in carbon dioxide, and the other end is soluble in water or an organic solvent. Only in this way can the polar organic solvent or water and carbon dioxide be reduced. interfacial tension. Therefore, in the application field of supe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01F17/44C07C231/12C07C233/36C09K23/44
CPCC07C41/03C07C67/08C07C231/02C07C231/12C09K23/00Y02P20/54
Inventor 朱魁袁俊秀曾志强庞雨微靳志超
Owner CHINA PETROCHEMICAL CORP
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