The "oil phase" refers to the organic extract recovered after solvent evaporation from the low pH aqueous phase product of lignin HBCD. This is commonly encountered in chemical processes involving extractions and separations.
In more detail:
The oil phase typically appears as the "oily" layer following an extraction procedure where an aqueous solution is mixed with an organic solvent. During lignin HBCD processing, after a low pH aqueous phase product is obtained, it undergoes further processing such as solvent extraction. The subsequent evaporation of this solvent leaves behind a concentrated organic extract, which is then called the "oil phase". This phase usually contains the desired product or a mixture of organic compounds separated from the original aqueous phase. Its exact composition depends on the solvent used and the specific compounds present in the original mixture.
