Novel technology for refineries

Online Editor

H+E Group, a leading supplier of industrial process water and wastewater treatment solutions, has developed and installed a new technology for the oil & gas industry.

One of the greatest challenges of the present time is the treatment of spent caustic in refineries. The caustic is highly contaminated with organic loads and usually contains sulphides, mercaptans and phenols. Up to now, the purification was very difficult or simply not possible. With the latest technology development of the H+E Group this challenge can now be met more easily. The AquaCritox SC technology is presented by the H+E Group in conjunction with Super Critical Fluids International (SCFI).

AquaCritox is a high pressure, high temperature hydrothermal oxidation technology originally designed to operate at supercritical water conditions i.e. above 221 bar and 374°C. The design employs a multistage tubular reactor and a novel pressure control system.

To overcome issues with high salt content associated with spent caustic the original AquaCritox concept technology was adapted to operate at near critical conditions but below the critical point, and so the AquaCritox SC process was conceived.

AquaCritox is now treating spent caustic from two of the most prestigious companies within the Middle East. Thanks to the fully automated unit supplied and located in the Middle East, the system has been successfully installed and operated without any issues. Subsequent laboratory results from on-site sampling confirm that efficient destruction of COD, sulphides and mercaptans was achieved. The treated spent caustic is therefore suitable for disposal or further treatment in a biological system.

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