Patent ID: 6048441
Filing Date: 2000-04-11
Classification: B01D,C07C,Y10S

Abstract:
A process for isolating neopentyl glycol hydroxypivalate (NGH) from a mixture containing NGH, lower- and higher-boiling products and inorganic salts, which comprises,in a first separation stage,a.sub.1) feeding the mixture to a wiped-film evaporator,a.sub.2) separating the mixture intoa stream of high-boiling products and inorganic salts anda distillate stream consisting of NGH, lower- and higher boiling products,a.sub.3) feeding the distillate stream to a heat exchanger and condensing it to form a liquid condensate,and, in a second separating stage,b.sub.1) feeding the liquid condensate to a rectification column,b.sub.2) separating the liquid condensate intoa distillate stream consisting of lower-boiling products,a sidestream of NGH, anda bottom stream of NGH and higher-boiling products,b.sub.3) feeding the distillate stream consisting of lower-boiling products to a second heat exchanger and condensing it to form a low-boiling condensate,b.sub.4) feeding the sidestream to a third heat exchanger and condensing the NGH,b.sub.5) feeding at least a part of the bottom stream to a second evaporator, andb.sub.6) recycling at least a part of the discharge from the second evaporator to the lower region of the rectification column.