Desiccant Posted on 7th November 201524th July 2021 by ThePD (The Project Definition) Desiccant is a hygroscopic chemical substance that picks up water, often used for drying or dehumidify air. Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window) Related Posted in Substance and tagged chemical. ThePD (The Project Definition) ThePD has been developing the Preferred Project Definitions based on the actual project execution and operation experiences and knowledge with the Project Language, and sharing with you daily basis.