METHOD FOR PRODUCING AQUEOUS UREA AND REMOVING BUIRET AND TRIURET FROM AQUEOUS UREA

摘要

More particularly, the present invention relates to a method for removing tri-urets that cause turbidity in urea water, and more particularly, to a method for removing urea from a urea water tank, The urea was added to ultrapure water at ~ 24 ° C, rapidly stirred through a magnetic mixer, and then filtered using a hollow-type ultrafiltration membrane (pore size 0.01-0.3um) to obtain a turbidity of 0.02-0.2 NTU. It causes for in the SCR relates to a method of removing tree wooret degrade the conversion efficiency to the NH _3, the manufacturing method for producing a number of elements to dissolve the element to the inventors of ultrapure water in order to achieve the object of the present invention, vehicle The number of urea is 32.5%; preparing ultrapure water at 15 to 24 캜; Moving the ultrapure water to a magnetic mixer tank; Charging an element into the ultrapure water contained in the magnetic mixer tank; Generating a vortex effect by operating a magnetic mixer to stir the ultrapure water and the urea to prepare urea water; The above-mentioned urea water containing trieol was passed through a hollow fiber ultrafiltration filter (U / F) while maintaining a low temperature state in which the water was reduced by stirring, and 20 liters of triolet and impurities were filtered S5). / RTI In the step (S5) of passing the urea water through the hollow ultrafiltration filter (pore size 0.01-0.3 탆) while keeping the lowered urea water containing the trieol by stirring, the amount of filtration per hour (S6) washing the hollow ultrafiltration filter with high temperature water in a forward or reverse direction. In addition, in the step S6 of washing the hollow ultrafiltration filter in the forward direction or the reverse direction, two hollow ultrafiltration filters are alternately used. When the filtration amount of the hollow ultrafiltration filter in use is decreased, the flow is made to the other hollow ultrafiltration filter And the filter having a reduced filtration amount is washed so as not to interrupt the production of the urea water in the above step.