Alcohol mixtures and their derivatives -SASOL SAFOL®
Publication Date: 2003-Mar-17
The IP.com Prior Art Database
Madelein van der Merwe: ATTORNEY [+3]
The invention relates to ester mixtures that are made from SAFOL® alcohols and/or acids derived from SAFOL® alcohols, wherein the alcohol component, the acid component or both have specific branching. In particular are mentioned phthalic acid esters of SAFOL® alcohols and their use as PVC plasticizer
SAFOL® INVENTION DISCLOSURE
SASOL Germany GmbH
Dr. Dirk Schär und Dr. Doris Elberfeld
3 March 2003
Alcohol mixtures and their derivatives
Linear, saturated fatty alcohols of the chain lengths C8 to C22 can be obtained from naturals fats and oils by hydrolysis or methanolysis followed by hydration of the resultant acids or methyl esters. Even longer-chained, linear saturated fatty alcohols C22 to C40 are present in natural waxes, e.g. in beeswax or also in lignite waxes. Petro-chemically linear, saturated fatty alcohols in the chain length range C6 to C20 can be obtained by the Ziegler process from aluminium, hydrogen and ethylene. In addition, by ethylene polymerisation and conversion of the obtained a-olefins, alcohols or also acids with chain lengths in the range C20 to C60 can be produced (Unilin alcohols and acids).
Semi-linear fatty alcohols such as Neodol® alcohols can be synthesised by ethane oligomerisation followed by selective hydroformylation of the obtained a-olefins. Such alcohols (mO-alcohols) have a content of primary, linear and saturated alcohols of approx. 80%.
So-called "normal" oxoalcohols (nO-alcohols) are generally produced on the basis of kerosene. Here, first the paraffin flow is isolated, which is then dehydrated to olefins and subsequently hydroformylated. The fatty alcohols obtained by this process contain approximately 50% primary, linear, saturated fatty alcohols. It is known that this product flow can be split into linear and branched portions.
In addition to these generally only singly branched fatty alcohols, fatty alcohols are known that are multiple branched. Such fatty alcohols are obtained by oligomerisation of propene and/or butenes. Normal chain lengths for such alcohols are C6 to C15 (e.g. isononanol, isodecanol and isotridecanol).
A new class of fatty alcohols became accessible by the hydroformylation of olefins that are obtained in the Fischer-Tropsch (FT) process from synthesis gas. In contrast to known fatty alcohols these fatty alcohols have structural specialities. Thus, the average branching degree is approx. 50% the same as for the "normal" oxoalcohols, but the branching does not occur in the 2-position or 3-position to the hydroxyl group.
nO- Alcohols mO- Alcohols FT- Alcohols
Linear Alcohols ~45% ~80% ~50%
Branched Alcohols ~55% ~20% ~50%
R-CH2-CH2-OH ~45% ~80% ®..