Neopentyl glycol condensation hydrogenation production process and device thereof

Abstract

The invention discloses a neopentyl glycol condensation hydrogenation production process which comprises the following steps of: 1) condensation, that is, performing a condensation reaction of isobutyraldehyde with a methanol aqueous solution of formaldehyde, delivering the mixed condensation products into a condensation circulation tower for separation, allowing hydroxypivalaldehyde to enter a hydrogenation reactor from the condensation circulation tower, allowing a gas-phase component to flow back to a raw material mixing zone for mixing, and to enter a condensation reactor; 2) hydrogenation, that is, performing a hydrogenation reaction of the hydroxypivalaldehyde with hydrogen, delivering the products into a gas-liquid separation tank, allowing a gas-phase component to flow back to the hydrogenation reactor, allowing the liquid-phase neopentyl glycol crude product to enter a saponification reactor; 3) refining, that is, performing a saponification reaction of the neopentyl glycol crude product, allowing the product to enter a low-boiling-point substance fractionating tower, allowing a liquid-phase component at the tower bottom to enter a flash tank, allowing a liquid-phase component at the flash tank bottom to enter a pH adjusting tank, adjusting the pH to 6.5-7, allowing the product to enter a falling film evaporator, allowing a gas-phase component at the top of the falling film evaporator to enter a drying tower, then to enter a rectifying tower for refining so as to obtain neopentyl glycol. The process of the invention is high in neopentyl glycol yield, and simple and effective in separation purification process.

Description

technical field [0001] The invention relates to a neopentyl glycol condensation hydrogenation production process and a device thereof. Background technique [0002] Neopentyl glycol (2,2-dimethyl-1,3-propanediol), referred to as NPG, is a typical neopentyl structure diol. The structure contains two symmetrical primary hydroxyl groups, showing unique properties, and it is easy to quickly participate in various chemical reactions such as esterification, condensation and oxidation. Neopentyl glycol has high chemical stability and thermal stability, which also makes its derivatives have excellent properties. [0003] Neopentyl glycol has many uses, mainly used in the production of saturated / unsaturated polyester resins, oil-free alkyd resins, polyester polyols and esters for synthetic lubricants, polyurethane foam and elastomer plasticizers, advanced lubrication Oil additives and other fine chemicals. Neopentyl glycol is an excellent solvent for the selective separation of a...

AI Technical Summary

Problems solved by technology

[0012] Chinese authorized patent CN1234017A discloses the refining treatment of hydroxypivalaldehyde and neopentyl glycol by means of extraction and distillation, which has a long process flow, high energy consumption, and incomplete separation of high molecular weight impurities, which has a great impact on product purity

Moreover, the patents CN1234017A and CN102083776A both use nickel catalysts in the hydrogenation reaction, the reaction temperature and pressure are high, and the catalyst activity is greatly affected by the outside world

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