A three-phase flow reaction device for olefin hydroformylation and its operating method

Abstract

The invention belongs to the field of reactor engineering, and relates to a three-phase flow reaction device for olefin hydroformylation, which includes a reactor, a heat exchanger and a gas distributor, and the center of the top of the heat exchanger passes through a pipe bent at right angles It communicates with the reactor, and the center of its bottom end is also communicated with the reactor through a pipe, and an axial flow pump is provided at the bend of the pipe from the bottom end, and the gas distributor is set at the bottom end of the reactor, and the reactor There is also a wire mesh demister horizontally arranged inside the upper end of the tank. The present invention is used for the hydroformylation reaction through the coupling of the gas-liquid-solid three-phase circulating fluidized reactor and the heat exchanger, so that the liquid-solid phase forms a dynamic circulation between the reactor and the tubular heat exchanger, The mass transfer and heat transfer process is effectively promoted, the conversion rate of raw gas and the selectivity of target product aldehydes are significantly improved, the total heat transfer coefficient of the heat exchanger is increased, and the required heat transfer area is reduced; through the gas-liquid-solid three-phase Fluidization realizes the good effect of promoting reaction mass transfer and heat transfer of external circulation heat exchanger.

Description

technical field [0001] The invention belongs to the field of reactor engineering, and in particular relates to a gas-liquid-solid three-phase circulating fluidized reactor and heat exchanger coupling device and an operation method thereof, which are used for hydroformylation reaction of olefins. Background technique [0002] As an important class of chemical products and chemical raw materials, aldehydes are mainly used in the production of chemical intermediates and polymer monomers such as acids, alcohols, ketoximes and enaldehydes. They are used in pharmaceutical and pesticide raw materials, engineering plastics, coatings and textile aids Pharmaceutical and other industries have a wide range of uses. In recent years, the demand for aldehyde products in domestic and foreign markets is still increasing. [0003] At present, olefins, carbon monoxide and hydrogen are used as raw materials, and a noble metal complex catalyst system is used to pass the mixed raw material gas i...

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Problems solved by technology

[0007] At present, the reactors used for olefin hydroformylation mainly have the following problems: (1) The synthetic aldehyde products or solvents are not completely separated from the catalyst, resulting in the loss of precious metal catalysts and large catalyst consumption; (2) High reaction temperature, Causes the decomposition and deactivation of the catalyst, shortening the service life of the catalyst; (3) The conversion rate of raw materials is not high, and the by-product alkane content is high, which affects the selectivity of aldehydes; the product has high impurities and low aldehyde content; (4) Reaction Influenced by the type of reactor, there are obvious temperature differences in the axial and radial directions of the reactor, heat accumulation, and the phenomenon of reactor overheating is prone to occur.

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