Gas to liquids (GTL) is a refinery process to convert natural gas or other gaseous hydrocarbons into longer-chain hydrocarbons, such as gasoline or diesel fuel The products contain almost none of the impurities, Sulphur, aromatics and nitrogen that are found in crude oil.

Sarv has designed the GTL process from the natural gas purification unit to liquid fuel separation plant and construct 3 barrel/day pilot plant based on the knowledge of Iranian experts.
All of the catalysts such as synthesis gas production and FTS were produced by the Sarv R&D department. The pilot plant was in service for 4 months continuously and the operating data were gathered for process modification and scale up.