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The urea extraction crystallization is a process for separating linear paraffins (n-paraffins, n-alkanes) from hydrocarbon mixtures through the formation of urea-n-paraffin-clathrates. The process is primarily used to lower the pour point of petroleum products, by-products of the process are n-paraffins in high purity. The method may also applied for the separation of fatty acids and fatty alcohols. In addition to urea also thiourea is used in the process.

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  • Die Harnstoff-Extraktiv-Kristallisation ist ein Verfahren zur Abtrennung linearer Paraffine aus Kohlenwasserstoffgemischen durch Bildung von Harnstoff-n-Paraffin-Clathraten. Die Trennung dient hauptsächlich der Erniedrigung des Stockpunkts von Mineralölprodukten, als Nebenprodukte fallen n-Paraffine in hoher Reinheit an.Das Verfahren wird auch bei Fettsäuren, deren Estern und Fettalkoholen angewendet, etwa zur Abtrennung von Omega-n-Fettsäuren. Neben Harnstoff findet Thioharnstoff in dem Verfahren Anwendung. (de)
  • The urea extraction crystallization is a process for separating linear paraffins (n-paraffins, n-alkanes) from hydrocarbon mixtures through the formation of urea-n-paraffin-clathrates. The process is primarily used to lower the pour point of petroleum products, by-products of the process are n-paraffins in high purity. The method may also applied for the separation of fatty acids and fatty alcohols. In addition to urea also thiourea is used in the process. (en)
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  • Die Harnstoff-Extraktiv-Kristallisation ist ein Verfahren zur Abtrennung linearer Paraffine aus Kohlenwasserstoffgemischen durch Bildung von Harnstoff-n-Paraffin-Clathraten. Die Trennung dient hauptsächlich der Erniedrigung des Stockpunkts von Mineralölprodukten, als Nebenprodukte fallen n-Paraffine in hoher Reinheit an.Das Verfahren wird auch bei Fettsäuren, deren Estern und Fettalkoholen angewendet, etwa zur Abtrennung von Omega-n-Fettsäuren. Neben Harnstoff findet Thioharnstoff in dem Verfahren Anwendung. (de)
  • The urea extraction crystallization is a process for separating linear paraffins (n-paraffins, n-alkanes) from hydrocarbon mixtures through the formation of urea-n-paraffin-clathrates. The process is primarily used to lower the pour point of petroleum products, by-products of the process are n-paraffins in high purity. The method may also applied for the separation of fatty acids and fatty alcohols. In addition to urea also thiourea is used in the process. (en)
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  • Harnstoff-Extraktiv-Kristallisation (de)
  • Urea extraction crystallization (en)
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