Yield-increasing and energy-saving technology of carbon dioxide stripping urea and equipment of carbon dioxide stripping urea

Abstract

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%.

Description

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AI Technical Summary

Benefits of technology

This invention relates to improving the process for producing chemical products from CO2 gas without consuming too much power or generating excessive greenhouse gases during their manufacture. By utilizing these techniques, it becomes possible to produce higher amounts of urease per kilogram of material compared with traditional methods that require high pressures and large facilities. Additionally, there has been an improvement on concentration heat recover systems used together with other processes like evaporation/distillation columns. Overall, this innovative method allows for efficient use of resources while reducing environmental impact.

Problems solved by technology

The technical problem addressed in this patented method relating to producing urethane from nitride compounds involves controlling the amount of hydrogen cyanate formed during decomposition reactions between two chemical substances at different temperatures or pressures. This can affect how much more energy needs to produce each molecule of urethanum acid ester before decompositing into other products such as melamine. Additionally, there are limitations on achieving efficient separation due to factors like vapor pressure variations caused by temperature changes and impurities present within the mixture's composition.

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