June 2017

Special Focus: Process/Plant Optimization

Modified revamp process to reduce energy use in an SDA unit

Solvent deasphalting (SDA) is emerging as a low-cost, bottom-of-the-barrel upgrading process to recover valuable oil from short residue. This oil can either be further processed to make lube-oil-based stocks or cracked in secondary processing units.

Kumar, S., Nanoti, S. M., Garg, M. O., CSIR-Indian Institute of Petroleum; Amutha, R., Nandagopalu, N. V. N., Chennai Petroleum Corp. Ltd.

Solvent deasphalting (SDA) is emerging as a low-cost, bottom-of-the-barrel upgrading process to recover valuable oil from short residue. This oil can either be further processed to make lube-oil-based stocks or cracked in secondary processing units. To achieve a higher deasphalted oil (DAO) yield, these units were designed for high solvent-to-feed ratios (values of eight to 10 are not uncommon). This huge quantity of solvent is recovered by evaporation through multiple flashes, and then compressed and recycled back to the extractor. This process is highly energy intensive. Most of the deasphalting units in operation were designed long ago, without using process integration and optimization

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