Patent ID: 8859825

Claim:
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 comprises a rotary pressure drum filter having a wash ratio ranging from 0.4 to 5.0; wherein said TMCD particles comprises 15% to 35% weight percent solids in said feed slurry; and wherein said feed slurry have a particle size ranging from about 1 micron to about 1000 microns.