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Phosphoric Acid

We provide consulting and basic engineering services for new and existing phosphoric acid plants.We actively support advancement of phos acid technology and have supported and developed valuable innovations. A brochure describing technology and listing phos acid projects is available upon request at JohnWingPE@verizon.net.


  • Dihydrate: Process design for several expansions and many modifications. Experience as Asst. Phos Acid Plant Supt., Tech Services Supt., &R&D Engr.
  • Hemi: Designed 2 very successful conversions from Dihydrate to Hemihydrate Consulted for 4 new Hemi plants.Studied conversion of several plants to Hemi See the Hemi page in this website.
  • Hemi-Di: Studied conversion of 5 phos acid plants to Hemi-Di. Basic engineering to convert Oswal plant to Hemi-Di. Construction was started but not completed after another company bought facility.)
  • Evaluations to select process: Advise clients regarding Dihydrate vs. Hemi


Supporting Sections


John Wing presented several phos acid papers AIChE Clearwater Conf., including:

The Hemi Era in Phosphoric Acid, 2006

  • Selecting a Phosphoric Acid Process:Di, Hemi, & Hemi-Di, 2008
  • Mud Chemistry? An Insider Reveals the Soft Side of Phosphate Technology, ‘09
  • Phosphoric Acid Evaporator Bottlenecks: Causes & Cures, 1980

He presented Phos Acid Reactors: Art & Science at Regional Phosphate Conf, 2010. These papers are available upon request at JohnWingPE@verizon.net.