尿素脱ロウ法に関する研究 (第4報)

尿素付加物から溶剤による炭化水素成分の抽出

抄録

There are several kinds of urea dewaxing process applicable to petroleum fractions. If the recovery of urea from adducts could be simplified, the dewaxing process by solid urea is interesting. Thus, we investigated the solvent extraction of component hydrocarbons from adducts to decide whether this technique is effective or not for applying the continuous dewaxing operation.
Toluene was used as the extracting solvent, and extracted at 95°C. Then, we re-used the recovered urea to form urea adduct. The extracting efficiency was not satisfactory. Furthermore, hydrocarbons which have stronger affinity to urea were gradually accumulated. Consequently, subsequent urea adduction was gradually reduced, and inhibitive substances were gradually accumulated in both of recovered solvent and urea.
With the experimental results, we understand that this process is not suitable.