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                                                                                                                                              首頁 > 技術與支持 > 介紹冷凍濃縮技術的兩種方法
                                                                                                                                              介紹冷凍濃縮技術的兩種方法
                                                                                                                                              點擊次數:365 發布時間:2022-01-10
                                                                                                                                                冷凍濃縮是近年來發展迅速的一種濃縮方式,是在常壓下利用稀溶液與冰在冰點以下固液相平衡關系來實現的,由于在低溫常壓下操作,具有可阻止不良化學變化和生物化學變化及風味、香氣和營養損失小等優點,備受國內外學者的關注。冷凍濃縮技術特別適用于濃縮熱敏性液態食品、生物制藥、要求保留天然色香味的高檔飲品及中藥湯劑等,這種低能耗、可生產高品質產品的加工技術具有巨大的發展潛力。隨著社會對高檔產品需求量的增加,冷凍濃縮技術將進一步顯示出其優越性及必要性。
                                                                                                                                                冷凍濃縮是在溶液冰點以下的低溫進行操作,沒有經過加熱處理,避免了物料中成分的熱分解,以及芳香物質的揮發,食品原有品質和風味得到充分保存。此外,整個加工操作均在低溫下實現,低溫也抑制微生物的增殖,降低微生物帶來的污染風險。含有多種溶質的溶液冷凍濃縮時,去除的僅是水分,不會引起其他組成成分的變化。對于能耗,從理論上分析可知,冷凍濃縮遠低于蒸發濃縮,具有廣闊的工業應用前景。
                                                                                                                                                介紹冷凍濃縮技術的兩種方法:
                                                                                                                                                一、懸浮結晶冷凍濃縮法
                                                                                                                                                懸浮結晶冷凍濃縮法是一種不斷排除在母液中懸浮的自由小冰晶,使母液濃度增加而實現濃縮的方法?,F已在生產中運用,其優點是能夠迅速形成結晶的冰晶且濃縮終點比較大,但由于種晶生成、結晶成長、固液分離三個過程要在不同裝置中完成,系統復雜,設備投資大、操作成本高。且迄今為止的報道顯示,懸浮結晶法所能形成的最大冰晶直徑僅為毫米級,小冰晶給分離造成的困難未能從根本上得到解決。
                                                                                                                                                二、漸進冷凍濃縮法
                                                                                                                                                漸進冷凍濃縮法是一種隨著冰層在冷卻面的生成和成長,固液界面附近的溶質被排除到液相側,導致液相中溶質質量濃度逐漸升高的濃縮方法。最大的特點是形成一個整體的冰結晶,固液界面小,使母液與冰晶的分離非常容易。同時,由于冰結晶的生成、成長,與母液的分離及脫冰操作均在同一個裝置中完成,具有良好的濃縮效果且裝置簡單,可以大幅度降低操作成本與初期投資。在很多行業都是研究熱點,有廣闊的發展前景。
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