Abstract: An apparatus and process for liquid oxygen production can be configured to avoid use of a feed compressor and a recycle compressor. Embodiments can be configured for open loop operation so that a relatively low yield liquid oxygen recovery can be obtained from a feed output from an electrolyzer that is comprised mostly of oxygen (e.g. at least 80 volume percent oxygen, between 80 vol % and 100 vol % oxygen, etc.). The relatively low yield liquid oxygen recovery can be surprisingly provided to permit an advantageous recovery of oxygen to limit waste oxygen that may ultimately be vented while also minimizing equipment and power requirements for the liquid oxygen recovery.