Lyophilisation targeting defined residual moisture by limited desorption energy levels
First Claim
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1. A process of freeze drying an essentially aqueous solution comprising the sequential steps ofa) subjecting the solution to a primary drying phase at a first temperature and pressure level to obtain a product;
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5°
C. to +3°
C. for at least 3 hours;
wherein a limited desorption energy input is applied in the secondary drying phase;
to obtain a lyophilized product having a predefined target rest moisture in steady-state conditions of 0.79-1.14%.
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Abstract
A process of freeze drying of an essentially aqueous solution comprising at least one first step having a first temperature and pressure level (i.e. primary drying phase) and at least one second step having a second temperature and pressure level (i.e. secondary drying phase) following the first step, wherein in the secondary drying phase limited desorption energy input is applied.
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Citations
9 Claims
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1. A process of freeze drying an essentially aqueous solution comprising the sequential steps of
a) subjecting the solution to a primary drying phase at a first temperature and pressure level to obtain a product; - and
b) subjecting the product to a secondary drying phase at 0.01 mbar and a temperature range from −
5°
C. to +3°
C. for at least 3 hours;
wherein a limited desorption energy input is applied in the secondary drying phase;to obtain a lyophilized product having a predefined target rest moisture in steady-state conditions of 0.79-1.14%. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification