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Method for separating emulsions

A technology of emulsion and ionic liquid, applied in the field of separation emulsion

Inactive Publication Date: 2010-06-09
THE BRITISH PETROLEUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a fundamental difference between water (a liquid with weakly ionized molecules) and ionic liquids (completely separated cations and anions)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation of 1,3-dimethylimidazolium methyl sulfate can be found in the literature "Efficient, halide free synthesis of new, low cost ionic liquids: Alkylimidazolium salts containing methyl-and ethyl-sulfateanions", J.D.Holbrey, W.M.Reichert, R.P Swatloski, G.A. Broker, W.R. Pitner, K.R. Seddon and R.D. Rogers, Green Chem., 2002, 4, 407-413.

[0027]An emulsion mixture of methyl sulfate 1,3-dimethylimidazolium (2 ml) and crude oil from the Harding Field of the North Sea (2 ml) was subjected to microwave irradiation using a CEM Explorer (trademark) laboratory microwave reactor, causing the emulsion to separate into The pale yellow ionic liquid layer and the dark oil layer on top. Due to the naturally occurring surfactants in Harding crude oil, when the ionic liquid is mixed with oil, an emulsion of the ionic liquid in oil will spontaneously arise.

Embodiment 2

[0029] 30 ml of Harding crude oil and 30 ml of ethyl 1-ethyl-3-methyliminoazosulfate were mixed at 60° C. and stirred at 2000 rpm with an overhead stirrer to form an emulsion.

[0030] Pipette 2 x 2 ml samples into microwave sample tubes. One tube was heated in a microwave oven for 1 minute; the control sample was heated in a 50°C water bath. The microwave-heated sample separated into two phases after one minute of heating. During the same time period, samples heated in a water bath showed only initial traces of formation of ionic liquid droplets and oil droplets, and required about 10 minutes to complete the corresponding separations.

Embodiment 3

[0032] Prepare 7 parts to comprise the emulsion that comes from the crude oil of Harding Field and ionic liquid that mass ratio is 1: 2, carry out microwave irradiation with using CEM Explorer (trademark) laboratory microwave reactor then, irradiation condition: power, 100 watts; Preparation time, 60 seconds; hold time, 60 seconds; temperature, 80°C. The preparation of ionic liquids in 7 emulsions was similar to that in "Ionic liquids insynthesis", Peter Wasserscheid, Tom Welton, 1st edition, November 2002, ISBN: 3-527-30515-7- Wiley-VCH, and these ionic liquids are: methyl sulfate 1-ethyl-3-methylimidazolium; bis-trifluoromethanesulfimide 1-ethyl-3-methylimidazolium; tetrafluoroboric acid 1 -octyl-3-methylimidazolium; bis-trifluoromethanesulfimide choline salt; 1-hexyl-3-methylimidazolium hexafluorophosphate; bis-trifluoromethanesulfimide 1,1 - butylmethylpyrrolidinium salt; and 1-H-3-methylimidazolium formate. In all cases, after irradiation, the emulsion separated into a ...

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PUM

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Abstract

A method for breaking an emulsion of an ionic liquid which is a salt that is in the liquid state at a temperature below 150DEG C, and an oil, comprising the steps of (a) irradiating the emulsion withmicrowave radiation; (b) separating the emulsion into an ionic liquid phase and an oil phase; and (c) recovering at least one of the phases.

Description

technical field [0001] The invention relates to a separation method of an emulsion formed by an ionic liquid and an oil. Background technique [0002] Many ionic liquids are readily separated from oils to form two-phase systems. Such ionic liquids can be used for the extraction of sulfur compounds from gasoline or diesel engines (sweetening), the extraction of olefins from alkanes, and as liquid catalysts for the oligomerization and polymerization of olefins. In practice, however, many common ionic liquids mix with oil to form emulsions, and the demulsification and separation of the ionic liquid and oil phases is problematic. [0003] The use of microwave radiation to aid in the breaking of water-in-oil and oil-in-water emulsions is known. For example: US4,528,629 describes a method for enhanced separation of hydrocarbons and water from emulsions or dispersions, including subjecting said emulsions or dispersions to microwave radiation in the range of 1 mm to 30 cm and usin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D17/04B01J19/12
CPCB01D17/00B01J2219/0888B01J19/126
Inventor K·安德森M·凡塞洛夫J·D·霍尔布里
Owner THE BRITISH PETROLEUM CO LTD