F+L Week 2019 | David Du Dachang | Coal-to-Liquid (CTL) base oil
The engine oil is going to lower and lower viscosity grades in order to meet fuel economy and emission reduction requirements from government regulations. How to meet such viscosity lowering requirements is a critical issue for all base oil players in higher viscosity index (VI), lower Noack volatility and excellent cold cranking simulator performance (CCS @-35 degree C), as well as excellent oxidation stability. PAO can play some role, but the cost is very high. Hydrocracker bottoms with very high VI to produce very high VI base oil is very hard to get. To improve higher VI base oil yield will result in worse refinery economics. Gas-to-liquid (GTL) is one of the solutions and has already been verified as a good way. With similar Fischer-Tropsch synthesis process to GTL, Coal-to-Liquid (CTL) is an alternative solution. The background of this Chinese CTL project and the CTL-based Group III+base oil project will be introduced in this presentation. The excellent Noack volatility, super high VI and ultra low CCS (@-35 degree C) also will be discussed based on pilot plant data.