I am working on extracting BTX from simulated water using deep eutectic solvents.Using DOE, factors of interest such as time, solvent mass fraction, temperature and speed were varied. On carrying out the runs I noticed the DES extracted B, T or maybe just one of then and gave a negative value for xylene.
A negative extraction efficiency in solvent extraction using deep eutectic solvents (DES) indicates a decrease in the concentration of the target compound (BTX) in the solvent phase, which can be caused by matrix effects, suboptimal solvent properties, experimental errors, or interference from other compounds. To resolve this issue, it is crucial to re-evaluate the experimental design, ensure accurate measurements, and potentially adjust the extraction conditions to optimize the process.
@Abdelhak Maghchiche thank you so much for your answer and possible solution. I have had to repeat some measurements but have the same negative result for especially xylene. Under most of the conditions, I get positive extraction for benzene & toluene, then negative extraction for xylene.
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