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Patent / Apr 09, 2020

Amorphous form of chelating agents and process for preparing them

  • Susana Saldanha
  • Antonio Parreira
  • Sara Sequeira
  • Rafael Antunes
WO 2020070508

An amorphous form of a chelating agent is provided, in particular wherein the chelating agent comprises EDTA​/edetic acid (EDTA)​, diethylenetriaminepentaacetic acid​/pentetic acid (DTPA)​, nitrilotriacetic acid (NTA)​, amino tris(methylenephosphonic acid) (ATMP)​, ethylenediamine tetramethylene phosphonic acid (EDTMP)​, 1-​hydroxyethane 1,​1-​diphosphonic acid (HEDP)​, ethylenediaminedisuccinic acid (EDDS)​, iminodisuccinic acid (IDS)​, hydroxamic acid, oxalic acid, galactaric acid, metaphosphoric acid, or phytic acid, or a salt of any one or more of the above acids, or a mixt. of two or more of any of the above acids or salts thereof.  A process for prepg. an amorphous form of a chelating agent comprises the steps of: (a) Dissolving the chelating agent in a suitable solvent; (b) Optionally purifying the soln.; (c) Isolating an amorphous form of the chelating agent; (d) Optionally post drying or conditioning the amorphous form of the chelating agent.  The field comprises: pulp bleaching, food and beverage preservation, industrial cleaning, detergents, cement, personal care and cosmetics, fertilizers, water treatment, or removal of and deactivation of metal ions in textiles.