Abstract
The disposal and re‐use of spent bleaching clay from the vegetable oil processing industry is a problem of growing importance.Although today the only practical way of removal of the spent material is disposal, extraction with organic solvents is a well‐known method of de‐oiling contaminated bleaching clay. In our investigations we compare the extractibility of two different types of bleaching clays with CO2 as a solvent. All experiments were carried out with a high‐pressure extraction plant. The extraction and separation conditions, temperature and pressure, as well as the CO2 mass flow, were varied during experiments. The aim of our investigations was a complete separation of the oil from the adsorbent. The latter should then be re‐used as bleaching clay. The oil and the bleaching clay were analyzed and tested, respectively. The results show that oil of good quality can be recovered and the bleaching clay still has an activity approximately 50% of fresh clay.
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