METHOD OF PRODUCING AMMONIA Russian patent published in 2012 - IPC C01C1/04 

FIELD: chemistry.

SUBSTANCE: invention can be used in chemical industry. Natural gas is compressed, heated and purified from sulphur compounds in a radial-spiral reactor. Two-step catalytic conversion of methane under pressure is carried out in a radial-spiral reactor which is divided into two sections. Steam conversion is carried out in the first section at temperature 800 - 1000°C using heat from the gas which is converted at the second step, as well as portions of natural gas, blow-off and flash gases additionally burnt at a burner. The temperature of flue gases after the burner is kept in the range of 900-1100°C by recycling a portion of cooled flue gases with mixture thereof with air fed into the burner. The mixture of gases fed into the burner is first heated using heat from flue gases from the first section. Air-steam conversion is carried out in the second section at 900-1400°C. Heat of the converted gas is used to heat the initial natural gas and generate steam. Catalytic conversion of carbon oxide is carried out in a single step in the radial-spiral reactor at temperature 200-220°C, which is maintained via water evaporation cooling. The nitrogen-hydrogen mixture is cleaned from carbon dioxide and oxygen-containing compounds in the radial-spiral reactor, compressed and fed for ammonia synthesis into the radial-spiral reactor.

EFFECT: cost effectiveness and ecological cleanness.

6 cl, 1 dwg, 1 ex