Difference between revisions of "Primary processing"
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=== Air drying === | === Air drying === | ||
Dehydration process that involves the evaporation of water under an oxygen atmosphere. The exchange of oxygen with low humidity accelerates this process but may lead to an (unwanted) oxidation of the product. | |||
=== Nitrogen drying === | === Nitrogen drying === | ||
Dehydration process that involves the evaporation of water under an nitrogen atmosphere. The exchange of nitrogen accelerates this process. Since nitrogen is an inert gas unwanted reactions such as oxidation of the product are avoided. | |||
=== Freeze drying === | === Freeze drying === | ||
Also known as '''lyophilisation'''. The technology represents a low temperature dehydration process that involves freezing the product, lowering pressure, then removing the ice by sublimation. | |||
=== Thermal drying === | === Thermal drying === | ||
Revision as of 14:17, 1 July 2021
Physical pre-treatments are based on physical principles whithout significantly changing the chemical structure of the feedstock. A change in the overall chemical composition might occur due to physical separation of different substances.
Densification
Pressure-densification
Drying (evaporation)
Air drying
Dehydration process that involves the evaporation of water under an oxygen atmosphere. The exchange of oxygen with low humidity accelerates this process but may lead to an (unwanted) oxidation of the product.
Nitrogen drying
Dehydration process that involves the evaporation of water under an nitrogen atmosphere. The exchange of nitrogen accelerates this process. Since nitrogen is an inert gas unwanted reactions such as oxidation of the product are avoided.
Freeze drying
Also known as lyophilisation. The technology represents a low temperature dehydration process that involves freezing the product, lowering pressure, then removing the ice by sublimation.