Navigation on this site is not optimized for your browser

Please use a recent version of Google Chrome, Mozilla Firefox, Safari or Microsoft Edge to get the most out of the experience.

Find a modern browser

Prayon Technologies licenses five different processes to produce phosphoric acid

The Calcium Sulfate co-product from a phosphoric plant is either hemihydrate (half a molecule of crystal water) or dihydrate (two molecules of crystal water) also named gypsum. Some processes include only one crystallization stage while the others consist of a conversion of hemihydrate to dihydrate or vice versa.

The dihydrate process is the most widely used to produce phosphoric acid and Prayon Technologies has worldwide references on various types of rock phosphate.

Back in the seventies, the local political and economic context promoted the development of other processes. As a pioneer of innovation in the phosphorus chemistry, the Prayon company operates a double crystallisation process (dihydrate – hemihydrate, with two filtration stages) that produces marketable phosphogypsum for the cement and plaster industry. In the same way, Prayon Technologies developed and patented the DA-HF process (dihydrate – hemihydrate, with one filtration stage) to produce valuable gypsum while reducing rock and steam consumption with a minimum capital cost investment.

During the oil crisis, the price of energy became so critical that some producers were attracted by the hemihydrate process routes. As the P2O5 content in the product phosphoric acid is higher, the energy consumption to evaporate the water and reach merchant grade is reduced. That process – also licensed by Prayon Technologies – enabled projects in remote desert locations where water availability is critical. The range of processes was completed with the Prayon HDH process (hemihydrate – dihydrate, with two filtration stages) that adds high-recovery efficiency to the benefits of the Hemihydrate technology mentioned above. In a context of soaring energy prices, these processes are more relevant than ever to enable producers to reduce their energy costs and carbon footprint.

Read Hadrien Leruth’ s recent article in World Fertilizer that provides an overview of these two categories of processes – where hemihydrate calcium sulfate is generated. It includes tips and techniques to guide future producers in the selection of the best process for their projects.

Click here to read the article

This website uses cookies

We use cookies and similar techonologies to adjust your preferences, analyze traffic and measure the effectiveness of campaigns. You consent to the use of our cookies by continuing to browse this website.
  • Essentials

    pll_language

    The server saves the language chosen by the user to display the correct version of the pages

    epic-cookie-prefs

    Cookie that remembers the user's choice of cookie preferences

    Storage time 12 months

  • Analytics

    Google Analytics

    Cookie from Google Analytics allows us to anonymously count visits, the sources of these visits as well as the actions taken on the site by visitors.

    Google Tag Manager

    Google Tag Manager cookie. Allows us to send data on Google Analytics

    Storage time 12 months

This website uses cookies

We use cookies and similar techonologies to adjust your preferences, analyze traffic and measure the effectiveness of campaigns. You consent to the use of our cookies by continuing to browse this website.