摘要:
The invention concerns a method for producing esters of a hydroxyacid and of a C1-C8 alcohol. The invention is characterized in that esterification is carried out by reactive distillation on a heterogeneous catalyst. The invention enables in particular production of high-purity lactic acid esters with high yield.
摘要:
Phytosterols, squalene and Vitamin E are recovered from phytonutrients concentrate derived from crude palm oil by the disclosed invention via esterification, transesterification, vacuum distillation, saponification, crystallization and organic solvents partitioning. Crude palm oil is subjected to esterification and transesterification for the production of crude palm oil methyl esters. Phytonutrients concentrate containing phytosterols, squalene, Vitamin E and unreacted monoglycerides is recovered from crude palm oil methyl esters by multi-stages vacuum distillation in which components with higher molecular weight are filtered during second stage vacuum distillation. The purified phytonutrients concentrate is subjected to saponification process and the unsaponifiable matter is added to a combination of solvents for crystallization of phytosterols. The filtrate enriched in squalene and Vitamin E is separated to its individual squalene-rich layer and vitamin E-rich layer via organic solvents partitioning.
摘要:
Hergestellt werden Esteröle, die aus Estern aus einer aliphatischen C6-C10-Monocarbonsäure und einem höheren Alkohol bestehen, durch Umestern eines Methyl- oder Ethylesters der Monocarbonsäure mit dem höheren Alkohol unter homogener alkalischer Katalyse, wobei die Einsatzstoffe im gleichen Temperaturbereich sieden und die Siedetemperaturen sich insbesondere nur um höchstens 10 °C unterscheiden. Man führt das Verfahren in einer Reaktionskolonne mit einer Mehrzahl von Böden durch, welche ohne Gasbelastung leerlaufen, wobei man die flüssigen Einsatzstoffe im oberen Teil der Kolonne zuführt und wobei man ein Inertgas als Stützgas von unten nach oben durch die Reaktionskolonne strömen lässt. Damit ist eine kontinuierliche Herstellung von Esterölen möglich, wobei schon nach einer geringen Verweilzeit ein praktisch vollständiger Umsatz erreicht wird. Es wird vorgeschlagen, die Zusammenfassung ohne Zeichnung zu veröffentlichen.
摘要:
The invention relates to a method for the production of polyesters or copolyesters, wherein continuos esterification of dicarboxylic acid esters and diols or continuos interesterification of dicarboxylic acid esters with diols is carried out in n reaction pressure levels connected one after the other, wherein the pressure in the first reaction pressure level, which is higher relative to the other reaction pressure levels, drops successively from one reaction pressure level to the other, the vapor flows of the individual reaction pressure levels are jointly rectified in a rectifying column and the diol components falling to the bottom of the rectifying column are fed back again at least to the first reaction level. In order to reduce the degree of complication of said process, at least the last reaction pressure level has a negative pressure, the pressure in the rectifying column is higher than the pressure in the last reaction pressure level and the vapors coming out of the last reaction pressure level are compressed to the pressure prevailing in the rectifying column.
摘要:
A 2-hydrocarbyl-2-adamantyl acrylate compound represented by the following Formula 6: is produced easily and stably with high yields by reacting a 2-adamantanone compound represented by the following Formula 1: with at least one organometallic compound represented by the following Formula 2 or 3:R 1 MgXR 1 Li and at least one acrylic compound represented by the following Formula 4 or 5: wherein, R 1 , R 2 , R 3 , X, Y and n in the above formulae being as defined in the disclosure.
摘要:
The invention relates to a method for the production of non-saturated fatty alcohols with improved low-temperature behaviour. In accordance with the invention, primary alcohols of formula (I): R OH, in which R stands for a non-saturated or predominantly non-saturated hydrocarbon radical with 6-22 carbon atoms, are subjected to fractional crystallization. This method makes it possible to obtain products having higher iodine value and lower turbidity point, and is not technically complex.