This document describes a patent application for a process and apparatus for preparing gas mixtures containing hydrogen and carbon monoxide through the partial combustion of hydrocarbon materials. The process involves atomizing and injecting hydrocarbon material into a combustion chamber as a hollow conical jet while introducing oxygen-containing gas with rotary motion, forming toroidal vortices that promote rapid mixing and combustion within 4 seconds at a pressure of at least 3 atmospheres, producing gas mixtures with very little soot. The apparatus described achieves this through the configuration and operation of the combustion chamber and oxygen chamber.