| 摘要 |
PCT No. PCT/JP97/00108 Sec. 371 Date Sep. 5, 1997 Sec. 102(e) Date Sep. 5, 1997 PCT Filed Jan. 21, 1997 PCT Pub. No. WO97/28100 PCT Pub. Date Aug. 7, 1997The present invention provides a process for preparing granular urea, which solves the problem of removing moisture in a prilling tower method and the problem of concentrating diluted formaldehyde in granulation by a fluidized, spouted bed method when urea is granulated in the presence of formaldehyde. That is, the present invention provides a process for preparing granular urea from liquid drops or sprayed drops of a urea solution, wherein the urea solution is divided into two portions of a urea solution A and a urea solution B, and a urea solution prepared by mixing an aqueous formaldehyde solution with the urea solution A, concentrating the above mixed solution and then mixing it with the urea solution B is used. |
