Sequoia Global, Inc. products

A mixture of heavy fuel oils, diesel fuel and water is commonly recovered from ships, tank-cleaning, washing, emergency responses to leaks, spills etc. Such wastes are collected by industrial service providers at ports, refineries, tank-terminals etc. The waste fuel oils are burned off in industrial furnaces either without treatment or after chemical treatment and centrifuging to reduce water and sludge content. Centrifuges consume a lot of power and still do not produce a completely dry product. With this type of treatment, diesel-like light fuels are not recovered and the treated product can still have a low flash point.

Hydrogenation in combination with vacuum drying and filtration is the most complete and advanced process technology for recycling of waste transformer oils. In the Hydrogenation process, hydrogen gas reacts with sulfur, nitrogen, chlorine and other unsaturated compounds present in waste transformer oil, producing a water-white, stable product with low sulfur concentration and superior insulating properties.

Sequoia’s process technology for coolant (antifreeze) recycling is based on vacuum distillation. It produces distilled water and >95% pure glycols from waste coolants. Approximately 3-10% residue is produced. The residue contains trace amount of oil, spent additives and sludge present in the spent antifreeze.

Disposal of waste water can be costly for many utilities, oil & gas fields, refineries and recyclers. Some wastewaters contain high total dissolved solids (TDS) including chlorides. Some others are distilled over in process units or dropped out in the bottom of tank and contain suspended solids, near-boilers like glycols and also toxics like volatiles organics or semi-volatiles.