Petro Palatos Company was registered in Tehran in 2011 to supply oil, gas, petrochemical and refinery equipment. After the formation of the research and development team in the downstream part of the Ministry of Petroleum, this company succeeded in patenting the nano-filter for sweetening sour gas in 1393, and Danesh was founded in 1398. This invention was carried out in a laboratory pilot and tested in Mahshahr Petrochemical. This company is implementing and performing the required tests in a semi-industrial pilot.