Method for the manufacture of improved ureaform fe

专利名称：Method for the manufacture of improved

ureaform fertilizer

发明人：Dahlia S. Greidinger,Liuba Cohen nee

Girshowitsh,Shimon Epstein

申请号：US05/670687申请日：19760326公开号：US04173582A公开日：19791106

摘要：The present invention relates to a method for the manufacture of an improvedureaform fertilizer. The method consists in the condensation of urea and formaldehydecarried out in a controlled system having a pH between 3.5 and 4.2 wherein the overallconcentration of the reagents is in the range of 20 to 40% by weight. The ratio betweenthe reagents is between 1.2 to 1.5 moles of urea to 1 mole of formaldehyde and thetemperature of the reaction is kept between 15° C. to 40° C. Examples of preferredcontrolled systems are H.sub.3 PO.sub.4 -KH.sub. 2 PO.sub.4 and H.sub.3 PO.sub.4 -NH.sub.4 H.sub.2 PO.sub.4. The method can also be performed in a continuous mannergiving rise to an overall quantitative yield, and being temperature self-regulating.

< P> The ureaform obtained by the method has an activity index of over 75 andexcellent physical properties.

申请人：FERTILIZERS & CHEMICALS LTD

代理人：John S. Roberts, Jr.

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