Furan-2,5-dicarboxylic acid purge process

摘要

Disclosed is an oxidation process to produce a crude carboxylic acid product carboxylic acid product. The process comprises oxidizing a feed stream comprising at least one oxidizable compound to generate a crude carboxylic acid slurry comprising furan-2,5-dicarboxylic acid (FDCA) and compositions thereof. Also disclosed is a process to produce a dry purified carboxylic acid product by utilizing various purification methods on the crude carboxylic acid.

主权项

1. A process to produce a purge stream in a method for making furandicarboxylic acid, said process comprising:
(i) oxidizing in a oxidation zone 5-(hydroxymethyl) furfural (5-HMF) in the presence of an oxidizing gas stream comprising oxygen and an oxidation solvent comprising acetic acid and a catalyst system at a temperature of about 100° C. to about 220° C. to produce a reaction medium comprising furandicarboxylic acid and then subsequently producing a crude carboxylic acid slurry comprising furandicarboxylic acid; wherein said oxidation zone comprises at least one oxidation reactor; wherein said catalyst system comprises cobalt in a range from about 500 ppm by weight to about 6000 ppm by weight with respect to the weight of the liquid in the reaction medium, manganese in an amount ranging from about 2 ppm by weight to about 600 ppm by weight with respect to the weight of the liquid in the reaction medium, and bromine in an amount ranging from about 300 ppm by weight to about 4500 ppm by weight with respect to the weight of the liquid in the reaction medium; and wherein said furandicarboxylic acid is produced at a yield of greater than 80%; (ii) routing said crude carboxylic acid slurry to a liquid displacement zone to produce a mother liquor stream comprising impurities; and (iii) routing at least a portion of the mother liquor stream to a mother liquor purge zone to isolate a portion of the impurities in the mother liquor stream and to produce a purge stream comprising the impurities and wherein a raffinate stream comprising catalyst and solvent is produced; wherein at least a portion of said raffinate stream is recycled to said oxidation zone.