JP4282719B2 - (メタ)アクリル酸及び/又は(メタ)アクリル酸エステルの製造のための工場装置部用洗浄液及びこれを利用した洗浄方法 - Google Patents
(メタ)アクリル酸及び/又は(メタ)アクリル酸エステルの製造のための工場装置部用洗浄液及びこれを利用した洗浄方法 Download PDFInfo
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- C—CHEMISTRY; METALLURGY
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- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
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Description
本発明の洗浄組成物は、水酸化ナトリウム及び水酸化カリウムからなる群より選択される1種以上のアルカリ金属水酸化物5乃至50重量%、水溶性アミノ酸0.01乃至1重量%、N,N’−メチレンビスアクリルアミド0.001乃至0.05重量%、並びにアゾビスイソブチロニトリル0.001乃至0.05重量%を含む水溶液であるのが好ましい。
本発明の(メタ)アクリル酸及び/又は(メタ)アクリル酸エステルの製造のための工場装置部の洗浄方法は、(a)製造工程中生成した(メタ)アクリル酸及び/又は(メタ)アクリル酸エステルを工場装置部から除去する段階、(b)前記工場装置部を水で洗浄した後、本発明の洗浄液組成物で洗浄する段階、及び(c)前記工場装置部を再び水で1回以上洗浄し、前記工場装置部から前記洗浄液組成物を除去する段階を含む。
5重量%の水酸化ナトリウム、0.1重量%のL−リシン(L-lysine)、0.001重量%のN,N’−メチレンビスアクリルアミド(MBAA)、そして0.001重量%のアゾビスイソブチロニトリル(AIBN)を水に加えて全体100重量%となるようにし、これを攪拌し溶解して、本発明の洗浄液組成物を製造した。
前記洗浄液組成物を、(メタ)アクリル酸又は(メタ)アクリル酸エステルの製造過程に使用される工場装置部の洗浄過程中に適用して、洗浄液組成物を85℃に維持しながらpH9の状態で2時間蒸気洗浄した後、蒸留塔実験を行った。
L−リシンの代わりに0.1重量%のグリシンを添加したことを除いては、実施例1と同一の方法で洗浄液組成物を製造し、これを利用して実施例1と同一の方法で工場装置部を洗浄した後、蒸留塔実験を行った。
L−リシンの代わりに0.1重量%のβ−アラニンを添加したことを除いては、実施例1と同一の方法で洗浄液組成物を製造し、これを利用して実施例1と同一な方法で工場装置部を洗浄した後、蒸留塔実験を行った。
5重量%の水酸化ナトリウムを含む水溶液を洗浄液組成物として使用したことを除いては、実施例1と同一の方法で工場装置部を洗浄した後、蒸留塔実験を行った。
蒸留塔実験の結果、比較例1の洗浄液組成物で蒸留塔を洗浄した後、6ヶ月の間運転した場合には、工場装置部内の原料を除去して運転カラムを分解した時、副反応により生成した高分子粘着物の量が多かった。しかし、本発明の実施例1乃至3により製造された洗浄液組成物を利用して蒸留塔を洗浄した後、再び6ヶ月の間運転を行った場合には、高分子粘着物の量が著しく減少したことが確認できた。
また、蒸留塔に付属した(メタ)アクリル酸又は(メタ)アクリル酸エステルの生産のための工場装置部もまた本発明の洗浄液組成物で洗浄した結果、装置内の狭い部分で除去し難かった粘着物の量が著しく減少し、完全に除去されなかった粘着物もまたその膨潤性が増加して粘度が落ちることにより、洗浄の容易性が増大したことが確認できた。
洗浄効果比較−生成した高分子粘着物の量の比較
本発明の洗浄液組成物と従来の洗浄液組成物の洗浄効果の比較のために、比較例1の洗浄液組成物を使用した後に6ヶ月の間蒸留塔を運転した後と、本発明の実施例1乃至3の洗浄液組成物を使用した後に6ヶ月の間蒸留塔を運転した後の、代表的に慢性的に高分子粘着物が形成される水分離塔の原料注入口の部分に生成した高分子粘着物の量を比較し、図1(Fig.1)に示した。
その結果、従来の洗浄液組成物で洗浄を実施した後には、6ヶ月前に生成されていた高分子粘着物の量が6ヶ月の間運転後にもほとんど変化がなかったが、本発明の洗浄液組成物で洗浄を実施した後に蒸留塔を運転し、装置部を切開して壁面に生成した高分子粘着物の量を比較した場合には、従来の洗浄液組成物より遥かに少量の高分子粘着物しか形成されていなかった。
洗浄効果比較−生成した高分子粘着物の粘度比較
本発明の洗浄液組成物と従来の洗浄液組成物の洗浄効果の比較のために、比較例1の洗浄液組成物を使用した後に6ヶ月の間蒸留塔を運転した後と、本発明の実施例1乃至3の洗浄液組成物を使用した後に6ヶ月の間蒸留塔を運転した後の、水分離塔の原料注入口の部分に生成した高分子粘着物の粘度を比較して、図2に示した。
その結果、比較例1の洗浄液組成物で洗浄を実施した後には、6ヶ月前に生成されていた高分子粘着物の粘度が6ヶ月の間運転後にもほとんど変化がなかったが、本発明の実施例1乃至3の洗浄液組成物で洗浄を実施した後に蒸留塔を運転し、後装置部を切開して壁面に生成した高分子粘着物の粘度を比較した場合には、比較例1の洗浄液組成物より粘度が遥かに低かった。
したがって、本発明の洗浄液組成物は、従来の洗浄液組成物では除去できなかった高分子シードを除去することにより、結果的に運転間に発生し得る高分子粘着物形成の原因を事前に防止できる効果がある。
Claims (5)
- 水酸化ナトリウム及び水酸化カリウムからなる群より選択される1種以上のアルカリ金属水酸化物5乃至50重量%、水溶性アミノ酸0.01乃至1重量%、N,N’−メチレンビスアクリルアミド0.001乃至0.05重量%、並びにアゾビスイソブチロニトリル0.001乃至0.05重量%を含む水溶液である、洗浄液組成物。
- (a)製造工程中生成した(メタ)アクリル酸及び/又は(メタ)アクリル酸エステルを工場装置部から除去する段階;
(b)前記工場装置部を水で洗浄した後、水酸化ナトリウム及び水酸化カリウムからなる群より選択される1種以上のアルカリ金属水酸化物5乃至50重量%、水溶性アミノ酸0.01乃至1重量%、N,N’−メチレンビスアクリルアミド0.001乃至0.05重量%、並びにアゾビスイソブチロニトリル0.001乃至0.05重量%を含む水溶液の洗浄液組成物で洗浄する段階;
(c)前記工場装置部を再び水で1回以上洗浄し、前記工場装置部から前記洗浄液組成物を除去する段階;
を含む、(メタ)アクリル酸及び/又は(メタ)アクリル酸エステルの製造のための工場装置部の洗浄方法。 - 前記アミノ酸が、グリシン、アラニン、バリン、ロイシン、イソロイシン、スレオニン、セリン、システイン、シスチン、メチオニン、アスパラギン酸、アスパラギン、グルタミン酸、ジヨードチロシン、リシン、アルギニン、ヒスチジン、チロシン、トリプトファン、プロリン、オキシプロリン、β−アラニン、アミノブチル酸、オルニチン、シトルリン、ホモセリン、トリヨードチロシン、チロキシン、ジオキシフェニルアラニン、及びこれらの混合物からなる群より選択されることを特徴とする、請求項2に記載の洗浄方法。
- 前記洗浄液組成物の温度が10乃至150℃であることを特徴とする、請求項2に記載の洗浄方法。
- 前記工場装置部が、反応器、蒸留カラム、抽出装置、熱交換器、蒸発器、凝縮器、管又はポンプであることを特徴とする、請求項2に記載の洗浄方法。
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