1039 results about "Methylamine" patented technology

The invention relates to a yield-increasing and energy-saving technology of carbon dioxide stripping urea and equipment of the carbon dioxide stripping urea. A medium-pressure decomposition and absorption technology, a vacuum heat recovery technology and a medium-pressure decomposition and absorption system are adopted additionally; two-section evaporation is changed to three-section evaporation; a rectifying section is arranged at the upper part of a medium-pressure stripping decomposition tower; a heating section is arranged at the lower part of the medium-pressure stripping decomposition tower; lower liquid of a synthetic tower and discharge liquid of a stripping tower are subjected to pressure reduction convergence, and then enter the medium-pressure stripping decomposition tower; urea methylamine liquid is in countercurrent contact with decomposition gas at the rectifying section, is rectified and then enters a heating section tube pass to urge methylamine to be decomposed into carbon dioxide and ammonia; a housing side is heated by steam of 185-195 DEG C, and then enters a medium-pressure methylamine condenser to be condensed; and the urea methylamine liquid at the bottom of the tower enters a urea rectifying tower to be further decomposed. With the adoption of the scheme, the yield-increase difficulty of the carbon dioxide stripping urea is overcome; the productivity of the urea can be improved greatly; an energy consumption index is reduced correspondingly; the problem of a nitrogenous fertilizer enterprise that the productivity of the urea is insufficient after a yield of synthesis ammonia is increased is solved better; and the productivity of the urea can be improved by above 50%.