Method for in-line quantitative analysis of a stream in a production plant for the synthesis of urea
AssigneeCasale SA
InventorLuca Rugnone
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Abstract
The invention discloses the use of Raman spectroscopy to analyze one or more process streams (5) of a urea synthesis production plant, where urea is synthesised from ammonia and carbon dioxide at high pressure (100-300 bar) and high temperature (50-250° C.). The radiation generated by the Raman scattering is analyzed to determine the concentration of components such as urea, ammonia and carbon dioxide in the process streams (5). A logic system implemented in a plant control unit (1) generates signals to target plant actuators to optimize the operation.
Claims11
A method of in-line quantitative analysis of at least one process stream of a urea synthesis process where urea is synthesized from ammonia and carbon dioxide, at a pressure in the range of 100 to 300 bar and temperature in the range of 50 to 250° C., said method comprising the use of Raman spectroscopy for said in-line quantitative analysis, wherein:
- the concentration of urea in said process stream is determined by Raman spectroscopy and through the detection of a spectroscopy band corresponding to excitation of the carbonyl di-amide bond;
- the concentration in said process stream of carbon-containing molecules other than urea and having a carboxyl group is determined by Raman spectroscopy as an equivalent concentration of carbon dioxide corresponding to the excitation of the atomic bonds in the carboxyl form.
Dependencies are inferred from the claim text.