Our expertise
Sequoia applies well-researched and proven process design at the core of each application offered to the market. Every plant is custom designed and supplied as modules to the extent possible, with active support to operations for years.
Sequoia’s process technology for re-refining used lubricating oils is based on distillation, adsorption and hydrotreating, recovering the 75% of valuable base oil still present in waste oil.
Hydrogenation plants that produce Group II or Group III base oil from solvent neutral base stocks, vacuum gas oils or used oils, renewable diesel (HDRD) from bio-feedstocks, and PCB-free transformer oil.
Sequoia’s coolant (antifreeze) recycling technology is based on vacuum distillation. It produces distilled water and more than 95% pure glycols from waste coolants.
Sequoia’s evaporation technology incorporating vapor compression separates purer water from contaminants to produce boiler-feed quality water from high-TDS and hard-to-treat industrial wastewater.
A two-step regenerative adsorption plant: oil is purified by adsorption on bauxite, and the saturated adsorbent is regenerated in-situ so it can be used again, improving colour, oxidation stability and viscosity index.
Hydrogenation combined with vacuum drying and filtration: the most complete process for recycling waste transformer oil into water-white, PCB-free insulating oil that meets OEM specifications.
Heat-integrated evaporation equipment that removes free and emulsified water from waste fuel oils and recovers saleable diesel, leaving a residual heavy fuel that meets flash point specifications.
Tell us about your feedstock, capacity and location. Our engineers will advise on the right process technology, plant layout and expected economics.