Patent ID: 9024080
Filing Date: 2015-05-05
Classification: C07C

Abstract:
1. A process for isolating crystallized 2,2,4,4-tetramethyl-1,3-cyclobutanediol (TMCD) particles comprising: treating an isolation feed slurry comprising the 2,2,4,4-tetramethyl-1,3-cyclobutanediol (TMCD) particles in a product isolation zone to produce an isolated TMCD product wet cake comprising the 2,2,4,4-tetramethyl-1,3-cyclobutanediol (TMCD) in an amount of at least 65 weight percent, wherein the product isolation zone is defined as a rotary pressure drum filter having a wash ratio ranging from 0.4 to 5.0; wherein said TMCD particles comprise 5% to 45% weight percent solids in the feed slurry; and wherein said feed slurry have a mean particle size ranging from less than 50 microns to about 600 microns.