Preventing or reducing scale in wet-process phosphoric acid production

Preventing or reducing scale in wet-process phosphoric acid production

  • CN 102,712,476 A
  • Filed: 09/24/2010
  • Published: 10/03/2012
  • Est. Priority Date: 09/25/2009
  • Status: Active Application
First Claim
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1. prevent or reduce the method that wet method prepares at least a scale forming matter in the process phosphoric acid that said method comprises:

  • Step in production process of phosphoric acid or multistep step are added with the amount that is enough to prevent or reduce said fouling and are selected from one or more following reagent;

    I) phosphonate derivative;

    Ii) sulfonic acid or verivate accordingly;

    Iii) carboxylic acid derivative;

    Iv) phosphite derivative thing;

    WithV) comprise second monomer and be selected from (the i) –

    first monomeric multipolymer (iv);

    Condition is;

    Said phosphonate derivative is not selected from;

    amino-three (methylene phosphonic acids) (ATMPA), 1-hydroxy ethylene-1;

    1-di 2 ethylhexyl phosphonic acid (HEDPA), NSC 446-five (methylene phosphonic acid) (DTPMP), quadrol methylene phosphonic acid (EDTMP), hydroxyl ethyl phosphine acyl acetic acid (HPAA) and phosphinylidyne butane-1;

    2,4-tricarboxylic acid (PBTCA).

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