Process for producing monopentaerythritol of high purity and...

Details Process for producing monopentaerythritol of high purity and... Process for producing monopentaerythritol of high purity and...

2007-02-05

2009-08-04

Price, Elvis O (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

C568S854000

Reexamination Certificate

active

07569736

ABSTRACT:
The invention relates to a process for producing monopentaerythritol of high purity and monopentaerythritol produced by the process. Formaldehyde is reacted with acetaldehyde in an aqueous solution in the presence of a strongly basic hydroxide in a conventional way. The obtained reaction mixture is evaporated to a dryness of 50-70% by weight and is thereafter cooled. Crystals of pentaerythritol thereby formed are separated off. The crystals are dissolved in water or in a water-containing mother liquor containing pentaerythritol to a dryness of 35-55% by weight. The solution is treated in a purification step whereupon monopentaerythritol of high purity is crystallized at a temperature of 40-90° C. and separated from the remaining mother liquor which is recirculated to the above mentioned step.

REFERENCES:
patent: 2053215 (1996-01-01), None
patent: 2199518 (2003-02-01), None
patent: 1728215 (1992-04-01), None

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