Production method of novel ureaformaldehyde slow-release nitrogen fertilizer and composite fertilizers of novel ureaformaldehyde slow-release nitrogen fertilizer

Production method of novel ureaformaldehyde slow-release nitrogen fertilizer and composite fertilizers of novel ureaformaldehyde slow-release nitrogen fertilizer

  • CN 104,761,324 A
  • Filed: 01/02/2014
  • Published: 07/08/2015
  • Est. Priority Date: 01/02/2014
  • Status: Active Application
First Claim
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1. a production method for New Type Urea formaldehyde slow-release nitrogen fertilizer, is characterized in that, comprises the steps:

  • (1), urea and formaldehyde solution Hybrid Heating, described urea and the mol ratio of formaldehyde are (1.5-2.5);

    1;

    (2), the hydroxymethylation pH value of urea and formaldehyde solution is adjusted between 7.5-10.5;

    (3), by the initial reaction temperature of the hydroxymethylation heating temperatures of urea and formaldehyde solution to 50 DEG C;

    (4), add catalyzer, start the hydroxymethylation of urea and formaldehyde solution, described hydroxymethylation may be carried out batchwise or carries out continuously;

    (5), methylolated reaction heat is used for heating cold urea formaldehyde solution, if temperature does not reach initial reaction temperature, can suitably heat;

    (6), the methylenation pH value of urea and formaldehyde solution is adjusted between 3.5-5.0;

    (7), add catalyzer, and temperature control is not carried out to the material of methylenation;

    (8), the methylenation of urea and formaldehyde solution completes in 1 minute-10 minutes in the reactor;

    (9) the slip direct spray granulating in prilling granulator, after the methylenation of urea and formaldehyde solution, obtains urea formaldehyde slow-release nitrogen fertilizer.

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