Preparation of n-valeraldehyde from low-butene feedstock mixture

Abstract

The present invention relates to the problem of how n-valeraldehyde can be prepared by hydroformylation from a feed mixture comprising a small proportion of n-butenes and a large proportion of n-butane. In particular, solutions were sought as to how existing methods of hydroformylation of such low butene mixtures could be further optimized in terms of material utilization. The object of the present invention is to improve the material utilization of the raw material mixture in the preparation of n-valeraldehyde from the raw material mixture with a small proportion of n-butene and a large proportion of n-butane. The method should be able to operate economically on an industrial scale. In particular, existing oxo plants should be retrofitted to achieve better raw material utilization. This is achieved by a combination of hydroformylation and dehydrogenation, wherein said combination is characterized in that the dehydrogenation is arranged in the downstream direction after the hydroformylation and is therefore significantly less than the conventional dehydrogenation provided upstream. scale. Sophisticated product removal effectively removes the contaminants formed in the process.

Description

technical field [0001] The present invention relates to the problem of how n-valeraldehyde can be prepared by hydroformylation from a feed mixture comprising a small proportion of n-butenes and a large proportion of n-butane. In particular, solutions were sought as to how existing methods of hydroformylation of such low butene mixtures could be further optimized in terms of material utilization. Background technique [0002] The classes of substances discussed in this context are basically Alkenes (Olefines), alkanes (paraffins), aldehydes and alcohols. These terms are used here corresponding to those commonly used in chemistry. [0003] In organic chemistry, classes of substances are often classified and named by their number of carbon atoms. Here, add the prefix C before the relevant substance class n , where n is the corresponding number of carbon atoms in the substance. If you mention e.g. C 4 Alkenes, then this refers to the four isomeric olefins having four carbon...

AI Technical Summary

Problems solved by technology

[0029] There is therefore also the practical problem of pollutants that require complex and expensive removal when the dehydrogenation is arranged downstream of the hydroformylation

Furthermore, even with world-scale oxo plants, it is almost impossible to operate a conventional-scale dehydrogenation unit at only close to full capacity

[0030] In conclusion, it can be stated that dehydrogenation and hydroformylation or a combination of hydroformylation and dehydrogenation are not implemented industrially because of incompatibility of industrial orders of magnitude and because of incompatible specifications of the products and reactants of the respective processes , thus requiring expensive intermediate removal

Images