Method for preparing nonanal by adopting loop reactor and venturi ejector for preparing nonanal

Abstract

The invention discloses a method for preparing nonanal by adopting a loop reactor. According to the method, n-nonanal is prepared through an octene hydroformylation reaction;1-octene, hydrogen and carbon monoxide are used as raw materials, triphenylphosphine tri-m-sulfonic acid sodium salt and rhodium chloride are used as catalysts, and octene hydroformylation reaction is carried out. A water / oil / gas three-phase reaction interface is increased through the loop reactor; the mass transfer rate among reaction raw materials 1-octene, synthesis gas (hydrogen and carbon monoxide) and a catalyst aqueous solution is increased; the conversion rate of the hydroformylation reaction is improved, the design parameters and related process parameters of the core part venturi ejector of the loop reactor are optimized, the conversion rate of octene is further improved, and the selectivity of n-nonanal in the product is improved.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and in particular relates to a method for preparing nonanal by hydroformylation using a new type of reactor equipment—a loop reactor. Background technique [0002] Nonanal is widely used in flavor formulations, often as the top fragrance of aldehyde bases, used to prepare roses, orange blossoms, lily of the valley, peonies, iris, sunflower leaves, sweet oranges, lemons, jasmine, tuberose, parsnips, etc. Fragrance type, nonanal is mainly prepared industrially by dehydrogenation of nonanol. This process has problems such as high production cost, complex process, low product yield, and serious environmental pollution. [0003] Olefin molecules and synthesis gas (CO+H 2 ) Under certain temperature, pressure and catalytic action, aldehydes with one more carbon can be obtained through hydroformylation. The rhodium-based complex homogeneous catalyst can carry out propylene hydroformylatio...

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Problems solved by technology

For practical industrial production, high-cost solvents should be reduced or not used as much as possible, catalysts should be recycled to reduce production costs, and the amplification effect of the process method should be fully considered. Therefore, the industrial application prospects of the above improved methods are poor, and they are still in the research stage. stage

[0006] And due to methods such as "fluorine two-phase", "organic liquid / liquid two-phase", "temperature-controlled phase separation" or ionic liquids, the ultimate goal is to achieve "homogeneous "Phase reaction" will cause the catalyst rhodium to transfer from the catalyst solution during the reaction, so that a certain degree of catalyst loss will occur during "two-phase separation".

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