GENERATION OF LOW-SOLIDS SECOND MOTHER LIQUOR FROM TEREPHTHALIC ACID PRODUCTION FILTER

摘要

Disclosed is a process for separating solids from liquid in a slurry. The process is characterized by using two filtration media. One filtration medium contains less than 10 mm in thickness of a filter cake containing the solids, and the other filtration medium contains at least 10 mm in thickness of a filter cake containing the solids. The second filtration medium has a higher separation efficiency that the first filtration medium. The process is particularly useful for separating terephthalic acid solids from an oxidation product slurry.

主权项

1. A process for separating solids from liquid in a slurry, the process comprising:
(a) contacting a first portion of a slurry comprising solids dispersed in a liquid with a first filtration medium to produce a first filtrate; (b) contacting a second portion of the slurry with a second filtration medium to produce a second filtrate; and (c) passing the first filtrate and the second filtrate to different locations; wherein the first filtration medium comprises less than 10 mm in thickness of a filter cake comprising the solids, wherein the second filtration medium comprises at least 10 mm in thickness of a filter cake comprising the solids, and wherein the second filtrate comprises a lower solids content than the first filtrate.