反应详情

Referring now more specifically to FIG. 1, urea from source 1 may be introduced by means of line 2 and means for control of flow 2a into reactor 3 simultaneously with wet-process phosphoric acid from source 4 by means of line 5 and means for control of flow 5a into reactor 3 wherein the resulting mixture of urea and acid is agitated by mixer 6 and retained in reactor 3 for a sufficient period of time for reaction to form urea phosphate. Air from source 7 flows by means of line 8 and means for control of flow 8a to ring sparger 9 to cause a substantial portion of the water that was introduced with the acid and/or urea solution to be swept away and vented from the mixture. The urea phosphate-water mixture is continuously discharged from reactor 3 by means of constant level overflow line 10, which is equipped with siphon breaker 11 onto the granulation bed in rotary drum granulator 12. Air from source 7 flows by means of line 13 and means for control of flow 13a to sparger 14 to effect a decrease in the moisture content of granular material therein down to only about 1.0 percent to about 2.0 percent by weight of material which is sufficiently low to ensure a highly desirable granular product. Granular material from granulator 12 flows by gravity through chute 15 to dryer 16. Air from source 7 flows by means of line 17 and means for control of flow 17a to sparger 18 to cause mainly curing and in some cases to cause additional water removal. Granular urea phosphate from dryer 16 flows by gravity through chute 19 to screen deck 20 wherefrom product 21 is sized to minus 6 plus 10 Tyler mesh. The oversize material flows by gravity through chute 22 to crusher 23 where it is reduced to essentially minus 16-mesh size. Crushed oversize, together with fines from screen deck 20 and some product from chute 21 is transported to recycle feeder 26 where it is fed by chute 27 to granulator 12.

1. additionmay be introduced by means of line 2
2. customretained in reactor
3. custom3 for a sufficient period of time for reaction