JP2021528348A - シリカ湿潤ゲルブランケットの超臨界乾燥方法 - Google Patents
シリカ湿潤ゲルブランケットの超臨界乾燥方法 Download PDFInfo
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Abstract
本発明の超臨界乾燥方法によれば、超臨界乾燥時、設備内部に塩が蓄積されることを防止して超臨界乾燥工程の運転安定性を向上させることができる。
また、本発明の超臨界乾燥方法によれば、ラインフィルターのみを分離して簡便に洗浄することができるので、洗浄に必要となる時間及びこれから発生するアンモニア廃水の総量を減少させることができて効率性の向上及び原価節減の効果がある。
Description
本出願は、2018年12月20日付韓国特許出願第2018−0166649号に基づく優先権の利益を主張し、当該韓国特許出願の文献に開示された全ての内容は本明細書の一部として含まれる。
本発明は、a)超臨界抽出器の内部にシリカ湿潤ゲルブランケットを配置する段階;b)前記シリカ湿潤ゲルブランケットを超臨界乾燥に付して残留物質を排出させる段階;及びc)前記残留物質を超臨界抽出器と圧力調節バルブとの間に設けられたラインフィルター(line filter)に投入して排出させる段階;を含み、前記段階b)及び段階c)は順次に又は同時に行い、前記段階c)はラインフィルターの内部で残留物質間の反応で生成された塩を濾過するものである、シリカ湿潤ゲルブランケットの超臨界乾燥方法を提供する。
前記段階a)は、超臨界抽出器(extractor)の内部にシリカ湿潤ゲルブランケットを配置する段階であって、前記超臨界抽出器は、超臨界流体を用いてシリカ湿潤ゲルブランケットの超臨界乾燥が行われる高圧の装置を意味する。
前記段階b)は、前記シリカ湿潤ゲルブランケットを超臨界乾燥に付して残留物質を排出させる段階であって、具体的に、超臨界流体を用いてシリカ湿潤ゲルブランケット内部の溶媒を二酸化炭素で置換し、二酸化炭素の臨界点(critical point)以上の温度と圧力でシリカ湿潤ゲルブランケットを乾燥することにより行われてよい。
段階c)
前記段階c)は、前記残留物質を超臨界抽出器と圧力調節バルブとの間に設けられたラインフィルター(line filter)に投入して排出させる段階であって、具体的に、前記ラインフィルターの内部で残留物質間の反応により生成された塩を濾過する段階である。
本発明は、1)シリカゾルを準備する段階;2)前記シリカゾルをブランケット基材に含浸させ、ゲル化してシリカ湿潤ゲルブランケットを製造する段階;3)前記シリカ湿潤ゲルブランケットを表面改質する段階;及び4)前記表面改質されたシリカ湿潤ゲルブランケットを超臨界乾燥に付する段階;を含み、
前記超臨界乾燥に付する段階は、前述の超臨界乾燥方法によるものである、シリカエアロゲルブランケットの製造方法を提供する。
前記段階1)は、シリカゾルを準備する段階であって、シリカゾルは、シリカ前駆体、アルコール及び酸性水溶液を混合して製造されるものであってよい。
前記段階2)は、シリカゾルをブランケット基材に含浸させ、ゲル化してシリカ湿潤ゲルを製造するためのものであって、段階1)のシリカゾルに塩基性触媒を添加した後、ブランケット用基材に含浸させて行ってよい。
前記段階3)は、前記シリカ湿潤ゲルを表面改質する段階であって、シリカ湿潤ゲルブランケットを表面改質剤で疎水化する段階であってよい。具体的に、シリカ湿潤ゲルの表面に表面改質剤から由来された疎水化基を結合させることによりなされてよい。
前記段階4)は、前記表面改質されたシリカ湿潤ゲルブランケットを超臨界乾燥させる段階であって、このとき、超臨界乾燥は、本発明の超臨界乾燥方法によるものである。
本発明のシリカエアロゲルブランケットの製造方法は、前記段階4)以後、5)超臨界乾燥したシリカ湿潤ゲルブランケットを300℃以上の温度の減少した酸素雰囲気に暴露する段階;をさらに含むことができる。
本発明は、超臨界乾燥が行われる超臨界抽出器;前記超臨界抽出器に連結されたラインフィルター;及び前記ラインフィルターに連結された圧力調節バルブ;を含む、シリカ湿潤ゲルブランケットの超臨界乾燥装置を提供する。ラインフィルターに対する説明は、前述したとおりである。
以下、実施例により本発明をさらに詳細に説明する。しかし、下記実施例は本発明を例示するためのものであり、これらだけで本発明の範囲が限定されるものではない。
1)シリカ湿潤ゲルブランケットロールの製造
75%水和されたテトラエチルオルトシリケート(HTEOS)(シリカ濃度19〜20重量%)、エタノール及び水を1:2.25:0.35の重量比で混合してシリカゾルを製造した。前記シリカゾルにエタノール:アンモニア水=210:1の重量比で混合した塩基性触媒溶液を前記HTEOS対比0.44重量%添加した後、ガラス繊維(glass fiber)に含浸させてゲル化を誘導した。ゲル化の完了後、シリカゾル対比80から90体積%のアンモニア溶液(2〜3vol%)を用いて50から70℃の温度で1時間放置して熟成させた後、シリカゾル対比80から90体積%のヘキサメチルジシラザン(HMDS)溶液(2〜10vol%)を用いて50から70℃の温度で4時間の間放置し、熟成させてシリカ湿潤ゲルブランケットロールを製造した。
前記シリカ湿潤ゲルブランケットロールを超臨界抽出器に位置させた後、60℃、100barで6時間の間超臨界乾燥を行った。ラインフィルターに含まれた濾過膜は50μmの平均孔径を有するものを用い、ラインフィルターを冷却して外部表面の温度は10℃に維持した。超臨界乾燥を完了してエタノールを回収し、50℃及び常圧条件で1時間の間さらに乾燥してシリカエアロゲルブランケットを製造した。
ラインフィルターの外部表面の温度を35から38℃としたことを除いては、実施例1と同一に行った。
ラインフィルターを用いていないことを除いては、実施例1と同一に行った。
前記実施例1、2及び比較例1の遂行を完了した後、ラインフィルター及び圧力調節バルブの内部に蓄積された塩を目視で観察した。
イオンクロマトグラフィー(ion chromatography)を用いて、回収したエタノールに残留するアンモニウムイオンの量を測定した。
Claims (11)
- a)超臨界抽出器の内部にシリカ湿潤ゲルブランケットを配置する段階;
b)前記シリカ湿潤ゲルブランケットを超臨界乾燥に付して残留物質を排出させる段階;及び
c)前記残留物質を前記超臨界抽出器と圧力調節バルブとの間に設けられたラインフィルター(line filter)に投入して排出させる段階;を含み、
前記段階b)及び段階c)は順次に又は同時に行い、
前記段階c)は前記ラインフィルターの内部で前記残留物質間の反応で生成された塩を濾過するものである、シリカ湿潤ゲルブランケットの超臨界乾燥方法。 - 前記ラインフィルターの外部表面の温度は0から50℃である、請求項1に記載のシリカ湿潤ゲルブランケットの超臨界乾燥方法。
- 前記段階c)のラインフィルターは、塩を濾過させるための濾過膜を含み、
前記濾過膜の平均孔径は1から100μmである、請求項1に記載のシリカ湿潤ゲルブランケットの超臨界乾燥方法。 - 前記段階c)の残留物質は、アンモニア、二酸化炭素、溶媒及び水を含む、請求項1に記載のシリカ湿潤ゲルブランケットの超臨界乾燥方法。
- 前記段階c)で濾過される塩は、アンモニア、二酸化炭素及び水の反応で生成されたものである、請求項4に記載のシリカ湿潤ゲルブランケットの超臨界乾燥方法。
- 前記超臨界乾燥方法を完了した後回収した溶媒に含まれたアンモニウムイオン(NH4 +)の量は30から300mg/kgである、請求項1に記載のシリカ湿潤ゲルブランケットの超臨界乾燥方法。
- 1)シリカゾルを準備する段階;
2)前記シリカゾルをブランケット基材に含浸させ、ゲル化してシリカ湿潤ゲルブランケットを製造する段階;
3)前記シリカ湿潤ゲルブランケットを表面改質する段階;及び
4)前記表面改質されたシリカ湿潤ゲルブランケットを超臨界乾燥に付する段階;を含み、
前記超臨界乾燥は、請求項1から6のいずれか1項に記載の方法によるものである、シリカエアロゲルブランケットの製造方法。 - 前記段階4)以後、
5)前記段階4)の生成物を300℃以上の温度の減少された酸素雰囲気に暴露する段階;をさらに含む、請求項7に記載のシリカエアロゲルブランケットの製造方法。 - 超臨界乾燥が行われる超臨界抽出器;
前記超臨界抽出器に連結されたラインフィルター;及び
前記ラインフィルターに連結された圧力調節バルブ;を含む、
シリカ湿潤ゲルブランケットの超臨界乾燥装置。 - 前記ラインフィルターは濾過膜を含み、
前記濾過膜の平均孔径は1から100μmである、請求項9に記載のシリカ湿潤ゲルブランケットの超臨界乾燥装置。 - 前記ラインフィルターの外部表面の温度は0から50℃である、請求項9に記載のシリカ湿潤ゲルブランケットの超臨界乾燥装置。
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