modular , portable processes and apparatus for the production of tight gas and tight oil and for the conversion of tight oil into a plurality of marketable fuels are described which enable easy deployment and start - up and are specifically useful in remote areas . furthermore , these modular processes and apparatus are configured to use co - produced tight gas as a source of processing energy . another feature of the modular processes is to substantially reduce the use of fracking water and process water . in some embodiments modular processes include purified salt production ; modular hydrochloric acid production ; hydrogen production by autothermal reformer ; optimized hydraulic fracturing ; desalting with bi - electric configuration with an interchanger ; desalter water recovery and recyclling ; precut column with a gas - fired heater ; crude distillation with a gas - fired heater ; hydrodesulfurization using reactive distillation ; and vacuum distillation .