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Use of ionic liquids with tetracyanoborate anions as a solvent for extraction of alcohols from aqueous solutions

A technology of tetracyanoboric acid and ionic liquid, which is applied in liquid solution solvent extraction, solvent extraction, separation methods, etc., can solve problems such as phase separation difficulties and foam generation

Inactive Publication Date: 2013-08-21
MERCK PATENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this has the disadvantage of emulsifiers, which can generate foam during liquid-liquid extraction applications
Formation of the foam phase results in more pressure loss in the column and moreover makes phase separation of the two liquid phases more difficult

Method used

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  • Use of ionic liquids with tetracyanoborate anions as a solvent for extraction of alcohols from aqueous solutions
  • Use of ionic liquids with tetracyanoborate anions as a solvent for extraction of alcohols from aqueous solutions
  • Use of ionic liquids with tetracyanoborate anions as a solvent for extraction of alcohols from aqueous solutions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0186] The ionic liquid containing the tetracyanoborate anion can be synthesized, for example, according to the disclosure of WO 2004 / 072089 ("Salze mit Cyanoborat-Anionen", Merck Patent GmbH), or purchased commercially.

[0187] Examples of the synthesis of selected compounds are:

Embodiment A

[0188] Example A: Synthesis of Trihexyltetradecylammonium Tetracyanoborate

[0189]

[0190] Dissolve 100g of trihexyltetradecylammonium bromide in 400l of demineralized water, and then slowly add 31g of potassium tetracyanoborate. Two phases slowly formed. The two-phase mixture was stirred for another 2 hours at room temperature and left overnight.

[0191] Workup is carried out by extraction with dichloromethane. The organic phase is then washed with demineralized water to make it free of bromide. To the organic solution, 8 g of ALOX and 5 g of activated carbon were added, then filtered, and then evaporated in a water bath at about 80° C. in a rotary evaporator to obtain a clear, light yellow viscous liquid.

Embodiment B

[0192] Example B: Trihexyltetradecyl tetracyanoborate Synthesis

[0193]

[0194] Similar to Example A, 33g of potassium tetracyanoborate was added to 100g of trihexyltetradecyl chloride Then, the mixture was subjected to corresponding post-treatment to obtain a clear, light yellow viscous liquid.

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Abstract

The invention relates to a method for the liquid-liquid extraction of alcohols from aqueous solutions using at least one ionic liquid containing a tetra-cyanoborate anion as solvent.

Description

Technical field [0001] The subject of the present invention is a method for liquid-liquid extraction of alcohol from an aqueous solution using at least one ionic liquid containing tetracyanoborate anion as a solvent. Background technique [0002] Due to the fierce debate over "white biotechnology" or the use of alcohol as an additive for conventional fuels, extraction of alcohol from aqueous solutions has become increasingly important. As part of the heated debate over biofuels, especially bioethanol, it has emerged that biobutanol, that is, butanol produced from living organisms, has also received attention as a possible biofuel. [0003] Compared with other biofuels, biobutanol has many advantages, especially [0004] -Because the vapor pressure is low (5.6hPa, and ethanol is 58.5hPa) and the flash point is relatively low (36℃, ethanol is 12℃), it is easy to mix with conventional dyes, [0005] -It shows significantly less hygroscopic behavior, [0006] -Energy enthalpy is similar t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D213/20C07D233/58C07F5/02C07F9/54C07D295/037B01D11/04C07C211/63
CPCY02E50/17C12P7/04B01D11/0426C07C211/63C07F5/027C12P7/06C07F9/5407C07D233/58C12P7/16Y02E50/10C07D295/037C07D213/20B01D11/0492Y02P20/54
Inventor W-R·皮特纳M·舒尔特A·格拉克F·桑坦格洛A·E·文廷克
Owner MERCK PATENT GMBH