This work reports for the first time a treatment to manage engine oils in an environmentally friendly manner which, besides, upgrades them into valuable gases: gasification with steam and supercritical water (SCW). Pressure, temperature and wt% ranges from 50 to 500 bar, 500–800 °C and 0.42–2.0%, respectively, were investigated. The process can be faced in two different ways regarding the temperature. A low-temperature gasification at 550 °C to transform up to 60% of oil into carbon-containing gases such as CH₄ and ethane in less than 2 min; and a high-temperature gasification at 750 °C that produces H₂, CH₄ and CO₂ as main gaseous products. Namely, SCW gasification at 250 bar, 750 °C and 0.83 wt% for 1.9 min transformed more than 85% of the oil into a gaseous mixture containing 37% H₂ and 29% CH₄, two valuable green fuels. The treatment is herein used to upgrade fresh engine oils but it is potentially applicable to the upgrading of such an abundant and polluting residue as waste engine oils.

这项工作首次报告了一种以环境友好的方式管理机油的处理方法，此外还将其升级为有价值的气体：蒸汽和超临界水（SCW）进行气化。研究了压力，温度和wt％分别为50至500 bar，500–800°C和0.42–2.0％。该过程可以以两种不同的方式面对温度。在550°C下进行低温气化，在不到2分钟的时间内将高达60％的油转化为含碳气体，例如CH ₄和乙烷；并在750°C下进行高温气化，生成H ₂，CH ₄和CO ₂作为主要的气态产品。即，SCW在250 bar，750°C和0.83 wt％的条件下进行1.9分钟的气化，将超过85％的油转化为含有37％H ₂和29％CH ₄的气态混合物，这是两种有价值的绿色燃料。该处理在本文中用于提纯新鲜的发动机油，但是它可能适用于提纯诸如废机油之类的大量污染性残渣的方法。