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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 can be used in liquid solution solvent extraction, solvent extraction, organic chemistry and other directions, and can solve the problems of foam generation and difficult phase separation.

Inactive Publication Date: 2011-05-04
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] Ionic liquids comprising tetracyanoborate anions 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 synthesis of selected compounds are:

Embodiment A

[0188] Embodiment A: the synthesis of trihexyl tetradecyl ammonium tetracyanoborate

[0189]

[0190] 100 g of trihexyltetradecylammonium bromide was dissolved in 400 l of demineralized water, followed by the slow addition of 31 g of potassium tetracyanoborate. Slowly 2 phases formed. The biphasic mixture was stirred for an additional 2 hours at room temperature and left overnight.

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

Embodiment B

[0192] Example B: Trihexyltetradecyl tetracyanoborate Synthesis

[0193]

[0194] Similar to Example A, 33 g of potassium tetracyanoborate was added to 100 g of trihexyltetradecyl chloride , and the mixture was worked up accordingly to obtain a clear, pale yellow viscous liquid.

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Abstract

The invention provides a process for liquid-liquid extraction of alcohols from aqueous solutions using at least one ionic liquid comprising a tetracyanoborate anion as a solvent.

Description

technical field [0001] The subject of the present invention is a process for the liquid-liquid extraction of alcohols from aqueous solutions using at least one ionic liquid comprising tetracyanoborate anion as solvent. Background technique [0002] Extraction of alcohols from aqueous solutions is becoming increasingly important due to the intense debate over "white biotechnology," or the use of alcohols as additives for conventional fuels. As part of the intense debate on biofuels, especially bioethanol, it has emerged that biobutanol, ie butanol produced by living organisms, is likewise attracting attention as a possible biofuel. [0003] Compared with other biofuels, biobutanol has many advantages, especially [0004] - It is easy to mix with conventional dyes due to its low vapor pressure (5.6hPa vs. 58.5hPa for ethanol) and relatively low flash point (36°C vs. 12°C for ethanol), [0005] - it shows significantly less hygroscopic behaviour, [0006] - energy enthalpy s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D213/20C07D233/58C07F5/02C07F9/54C07D295/037B01D11/04C07C211/63
CPCB01D11/0426B01D11/0492C07C211/63C07D213/20C07D233/58C07D295/037C07F5/027C07F9/5407C12P7/04C12P7/06C12P7/16Y02E50/10Y02P20/54
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