METHOD FOR ISOLATING N-BUTYRIC ALDEHYDE Russian patent published in 2007 - IPC C07C47/02 C07C45/82 

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to a method for isolating n-butyric aldehyde from the aldehyde distillate of a propylene hydroformylation product containing, n-butyric aldehyde, isobutyric aldehyde and water, butyl alcohols, methanol, butylformate, acids, hydrocarbons, saturated and unsaturated butyl esters, propylketones, butylbutyrates, C₈-aldehydes, C₁₂-acetals and unidentified oxygen-containing components as impurities. Method is carried out into two fractionating devices wherein isobutyric aldehyde, water and some amount of n-butyric aldehyde and other impurities are isolated by upper part of the first device, and the end n-butyric aldehyde is isolated by upper part of the second device from vat product of the first device. Isolation of n-butyric aldehyde is carried out in heat-mass-exchange devices equipped by heat-mass-exchange packages made of metallic sheet or net and prepared as Z-shaped crimps, and special equipments for uniform distribution of phlegm by device section and wherein the specific surface of these packages is 100-800 m²/m³ and with corresponding height of crimps and their slope by vertical providing the pressure drop value between upper part and bottom of the first device in the range 0.01-0.10 atm., and that of the second device in the range 0.01-0.07 atm. Isolation of head fraction in the first device is carried out with consumption wherein amount of n-butyric aldehyde in its is 2-2 wt.-% of potential content in rectification raw. Separation in the second device is carried out at the spraying temperature on upper package of the device in the range 20-30^oC. Method provides simplifying of technology in isolation of n-butyric aldehyde, enhancing potential removal of n-butyric aldehyde and decreasing consumption of heating steam per 1 t of the end product.

EFFECT: improved isolating method.

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