Method for industrially and continuously producing crystalline urea

Method for industrially and continuously producing crystalline urea

  • CN 102,531,709 A
  • Filed: 03/09/2012
  • Published: 07/04/2012
  • Est. Priority Date: 03/09/2012
  • Status: Active Application
First Claim
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1. the method for an industriallization continuous production crystal urea is characterized in that it comprises following operation steps:

  • (1) ultrapure water and granular urea being put into reaction kettle by 1;

    1.5~

    2 mol ratios dissolves;

    Reacting by heating still and continuous stirring reaction solution;

    Keep temperature of reaction kettle to be controlled at 60 ℃



    90 ℃

    , it is heated evenly, when being heated to that urea is approaching to be dissolved fully;

    Add acidic formulation and be adjusted to 1~

    8 to the solution pH value, and be retained to the urea dissolving fully;

    (2) when the solution fusion in the reaction kettle is saturated urea slip, slip is discharged in the mold, when being cooled to 45 ℃

    , stirs, be cooled to room temperature at last and obtain the urea crystals body through cooling system;

    (3) the urea crystals body is delivered to whizzer and carry out solid-liquid separation;

    Isolated solution can temporarily be deposited in the mother liquor tank as mother liquor;

    Recycle is added in the reaction kettle then, and isolated urea crystals body is dry through fluid bed dryer, and its moisture is reduced to below 0.5%;

    Deliver to the screening of 40 purpose sieve apparatus again, obtain the crystal urea product.

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