A modular gas processing system built with various gas processing modules and cubes improve transportability and customization. Individual gas processing modules and cubes can be included or removed in multiple combinations for customization because each module has a common interconnection point for connecting to any other gas processing module and cube.

A detachable purifier includes a compressor configured to pressurize a fluid, a buffer tank connected to the compressor, and configured to store the fluid, a particle filter connected to the buffer tank and configured to filter impurities in the fluid when the fluid passes through the particle filter; a dehumidifying filter connected to the buffer tank and configured to filter moisture within the fluid when the fluid passes through the dehumidifying filter; a first inlet pipe connected to the compressor and having a first removable connector for connection to a supply flow path; and a discharge pipe connected to the dehumidifying filter and having a second removable connector for connection to the supply flow path, and wherein the buffer tank is provided between the particle filter and the dehumidifying filter.