Process for the preparation of isobutylidene diurea

Abstract

Disclosed herein is mixed fertilizer according to the process comprising: reacting isobutyraldehyde with an aqueous solution of urea in the presence of a phase transfer catalyst to form isobutylidene diurea, wherein the phase transfer catalyst is a quaternary ammonium salt; and mixing the isobutylidene diurea with at least one of another fertilizer, a secondary nutrient, a trace element, a plant protection agent, a filler, and other fertilizer ingredients, to form the mixed fertilizer. Also disclosed is isobutylidene diurea produced by the process comprising: reacting isobutyraldehyde with an aqueous solution of urea in the presence of a phase transfer catalyst to form isobutylidene diurea; wherein the phase transfer catalyst is a quaternary ammonium salt.

1 . A mixed fertilizer produced according to the process comprising:
 reacting isobutyraldehyde with an aqueous solution of urea in the presence of a phase transfer catalyst to form isobutylidene diurea, wherein the phase transfer catalyst is a quaternary ammonium salt; and   mixing the isobutylidene diurea with at least one of another fertilizer, a secondary nutrient, a trace element, a plant protection agent, a filler, and other fertilizer ingredients, to form the mixed fertilizer.   
     
     
         2 . The mixed fertilizer according to  claim 1 , wherein the phase transfer catalyst is benzyltriethylammonium chloride. 
     
     
         3 . The mixed fertilizer according to  claim 1 , wherein the amount of phase transfer catalyst is 0.5 to 5 mol % of the isobutyraldehyde. 
     
     
         4 . The mixed fertilizer according to  claim 1 , wherein the aqueous solution of the urea contains the urea in an amount of 50 to 85 wt %. 
     
     
         5 . A process for using a mixed fertilizer, comprising:
 applying the mixed fertilizer of  claim 1  to horticultural or agricultural soils.   
     
     
         6 . Isobutylidene diurea produced by the process comprising
 reacting isobutyraldehyde with an aqueous solution of urea in the presence of a phase transfer catalyst to form isobutylidene diurea;   wherein the phase transfer catalyst is a quaternary ammonium salt.   
     
     
         7 . The isobutylidene diurea according to  claim 6 , wherein the reacting of the isobutyraldehyde with the aqueous solution of urea in the presence of the phase transfer catalyst is performed in one pot. 
     
     
         8 . The isobutylidene diurea according to  claim 6 , wherein the phase transfer catalyst is benzyltriethylammonium chloride. 
     
     
         9 . The isobutylidene diurea according to  claim 6 , wherein the amount of phase transfer catalyst is 0.5 to 5 mol % of the isobutyraldehyde. 
     
     
         10 . The isobutylidene diurea according to  claim 6 , wherein the aqueous solution of the urea contains the urea in an amount of 50 to 85 wt %. 
     
     
         11 . The isobutylidene diurea according to  claim 6 , wherein a particle size of more than 80 wt % of the isobutylidene diurea particles is 150 to 300 micrometers and wherein the size of the isobutylidene diurea does not exceed 500 micrometers. 
     
     
         12 . A soil mixture comprising:
 horticultural or agricultural soils; and   the isobutylidene diurea according to  claim 6 .   
     
     
         13 . Feed comprising the isobutylidene diurea according to  claim 6 .