Chinese Academy of Sciences

Xueqiang Dong

Maoqiong Gong

Yanxing Zhao

Jun Shen

Hao Guo

A low-temperature quick-freezing freeze-drying system provided by the invention includes: a compressor unit, a first heat exchanger, an air cooler, a second heat exchanger, a throttling element, a third heat exchanger, a circulating fan, a drying chamber, a third valve, a fourth valve and connecting pipelines, and the above elements form a refrigeration circulation loop, a quick freezing/freeze-drying circulation loop, and a desorption drying circulation loop, thereby realizing the low-temperature quick-freezing and freeze-drying of materials. The invention adopts the heat exchangers with a cold storage function, so that the refrigeration capacity of the compressor is stored and used intensively to achieve rapid cooling of the materials.

Low-temperature quick-freezing freeze-drying system

The cryogenic liquid medium provided by the present invention includes at least one of an alkane composition, an olefin composition, an alcohol composition and an ether composition, and each of the alkane composition, the olefin composition, the alcohol combination and the ether composition includes a corresponding non-toxic and harmless substance having a melting point lower than &#x2212;110&#xb0; C. and a standard boiling point higher than 50&#xb0; C. Since the cryogenic liquid medium is formed by the non-toxic and harmless single substance having the melting point lower than &#x2212;110&#xb0; C. and the standard boiling point higher than 50&#xb0; C. or a binary, ternary and multi-component mixture thereof, the cryogenic liquid medium has a lower atmospheric boiling point, and is difficult to volatilize. The eutectic crystal of the specific mixture can be used to achieve the liquid requirements of low temperature, especially the temperature below &#x2212;110&#xb0; C.

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Beijing, China

Xueqiang Dong