Experimental Study on Rapeseed Drying Characteristics with Magnesium Sulfate as Solid Desiccant

Area of Science:

• Agricultural Engineering
• Materials Science
• Food Science

Background:

• Rapeseed (Brassica napus) is a vital oilseed crop requiring efficient post-harvest drying.
• Conventional drying methods risk overheating rapeseed due to its high initial moisture content.
• Energy-efficient sorption drying offers a low-temperature alternative for preserving seed quality.

Purpose of the Study:

• To investigate the efficacy of fine crystalline magnesium sulfate (MgSO4·nH2O) as a desiccant for rapeseed drying.
• To characterize the physical and chemical properties of the desiccant before and after use.
• To determine the optimal conditions for achieving desired moisture content and assess seed viability.

Main Methods:

• Sorption drying experiments using magnesium sulfate with varying desiccant-to-rapeseed ratios (1:2, 1:4, 1:6).
• Analysis of rapeseed initial moisture content (12-16%).
• Characterization of the desiccant using SEM-EDS, XRD, ATR-MIR, and DSC-TG techniques.
• Assessment of seed germination capacity post-drying.

Main Results:

• Achieved target rapeseed moisture content of 7-8% within 60-240 minutes.
• Magnesium sulfate demonstrated reusability for 2-3 drying batches without regeneration.
• Seed germination capacity remained high at 90%, meeting elite standards.

Conclusions:

• Sorption drying using magnesium sulfate is an effective and energy-efficient method for rapeseed.
• This technique successfully reduces moisture content while maintaining high seed quality and viability.
• The reusability of the desiccant enhances the economic feasibility of this drying process.