A kind of catalyst for preparing aldehyde by two-phase catalytic hydroformylation reaction and its application

Abstract

The invention relates to a catalyst that uses alcohol and water as solvents and contains water-soluble phosphine ligands and rhodium compounds, and a method for preparing high-carbon aldehydes by performing a two-phase hydroformylation reaction using α-olefins with C5 or above as raw materials. Overcoming the low reaction rate of hydroformylation of high-carbon α-olefins above C5 in the existing two-phase water-soluble rhodium-phosphine catalytic process. Adding surfactants to increase the reaction rate will produce two-phase emulsification and dissolution, resulting in difficulty in phase separation and an increase in rhodium. Disadvantages of Catalyst Loss. It can increase the reaction rate or avoid emulsification to reduce the loss of rhodium catalyst. It uses a non-toxic and environmentally friendly mixed solvent of alcohol and water, which can be recycled and the production cost is significantly reduced.

Description

technical field [0001] The invention relates to a catalyst, in particular to a catalyst containing water-soluble phosphine ligands and rhodium compounds using alcohol and water as solvents, and a two-phase hydroformylation reaction using C5 or more α-olefins as raw materials to prepare higher carbon aldehydes Methods. Background technique [0002] Aldehydes above C6 are commonly known as high-carbon aldehydes, and are mainly used to produce high-carbon alcohols (alcohols above C6). Higher alcohols are widely used, and it is the main raw material for the preparation of plasticizers, detergents and surfactants. At present, the high-carbon alcohol used in the production of plasticizers in my country is mainly C8 alcohol, namely 2-ethylhexanol. 2-Ethylhexanol is produced by propylene hydroformylation reaction to produce n-butyraldehyde and isobutyraldehyde, and n-butyraldehyde is further hydrogenated after aldehyde condensation under alkali catalysis. The key technology for p...

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Problems solved by technology

[0012] In order to overcome the low hydroformylation reaction rate of high-carbon α-olefins above C5 in the existing two-phase water-soluble rhodium-phosphine catalytic process, adding a surfactant to increase the reaction rate will cause two-phase emulsification and dissolution, resulting in phase separation difficulties and increased The shortcoming of rhodium catalyst loss, the present invention provides a kind of catalyst that contains alcohol and water mixed solvent, water-soluble phosphine ligand and rhodium compound, is used for C5 above α-olefin hydroformylation reaction and prepares higher carbon aldehyde, can improve reaction rate, Or avoid emulsification to reduce rhodium catalyst loss

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