Purification of neopentyl glycol

Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing

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568853, C07C 2980, C07C 2986, C07C 3120

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active

049355554

ABSTRACT:
In a process for the production of neopentyl glycol by hydrogenation of the aldol product of formaldehyde and isobutyraldehyde, an improvement comprises the wiped-film evaporator treatment of a saponified NPG-containing mixture. The process results in a very pure product and also eliminates the need for the addition of steam to the crude NPG, thus saving the cost of energy for removing the water from the NPG.
A further yield improvement is achieved by extracting NPG from the caustic residue with isobutyraldehyde and water. The isobutyraldehyde selectively recovers the NPG while the water selectively removes the caustic. The isobutyraldehyde and NPG are then conveniently recycled to the aldol reaction zone.

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Pfaudler's "Wiped Film Evaporator" Sales Bulletin SB 39-100-1, pp. 1-8, 1984.

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