Biodiesel purification by solvent-aided crystallization using n-hexane as solvent

Counter-current chromatography using hexane/surfactant-containing water solvent systems.

We developed a n-hexane/surfactant-containing water solvent system in counter-current chromatography (CCC) in order to separate hydrophobic compounds. By using the upper phase as the mobile phase, we have separated steroid samples. Retention times of steroids progesterone and delta4-androstene-3,17-dione increased slightly by increasing the concentration below the critical micellar concentratio...

Aided Solvent Selection and Design Framework

Cloning of organic solvent tolerance gene ostA that determines n-hexane tolerance level in Escherichia coli.

A variety of genes are involved in determining the level of organic solvent tolerance of Escherichia coli K-12. Gene ostA is one of the genes contributing to the level of organic solvent tolerance. This gene was cloned from an n-hexane-tolerant strain of E. coli, JA300. A JA300-based n-hexane-sensitive strain, OST4251, was converted to the n-hexane-tolerant phenotype by transformation with DNA ...

Alkylation of Theobromine: Preparation of Isopropyl and sec-butyl- theobromines using N, N-dimethylformamide as Solvent

N-isopropyltheobromine and N-sec-butyltheobromine were synthesized via nucleophilic substitution reaction by reacting theobromine and two kind of alkyl bromide derivatives, i.e. isopropyl bromide and sec-butyl bromide using N, Ndimethylformamide (DMF) as a solvent. Yields (N-isopropyltheobromine = 7.70%; N-sec-butyltheobromine = 5.89%) were slightly less than the previous synthesis which used e...

Contents 1 The Possibility of using Solvent - Solvent Extraction

This report investigates the use of solvent-solvent extraction for the secondary concentration of lead and thorium. The extraction reagents investigated in this report are: For the lead extraction: diethlyammonium diethyldithiocarbamate (DDDC) For the thorium extraction: trioctylphosphinc oxide (TOPO) and di-(2-ethylhexyl)phosphoric add (HDEHP). For all of the extractions 2-octanone was used as...