PROCESS FOR THE RECOVERY OF DISPROPORTIONATION REACTION PRODUCTS

• Main Authors: SALTER, JAMES A, CHEN, YE-MON
• Format: Patent
• Language: English; French
• Published: 08.03.2001
• Edition: 7
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC CHEMISTRY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; THEIR PREPARATION OR CHEMICAL WORKING-UP; THEIR RELEVANT APPARATUS; TRANSPORTING

In a process for producing aromatic dicarboxylic acids which includes a disproportionation reaction, a process for separating the disproportionation product solids from the reaction medium, said solids exiting said disproportionation reactor in a liquid/solid slurry at elevated pressure whi ch comprises: a) directing said reactor effluent in said liquid/solid slurry through a fluidic valve using a second injection of liquid reaction medium t o control the flow of reactor effluent, b) thereafter directing said reactor effluent into a pressure letdown section where the liquid/solid slurry is accelerated, causing pressure to drop and the liquid to flash, c) thereby gradually flashing all liquid from the reactor effluent slurry in the pressu re letdown section, resulting in a change in said reactor effluent from liquid/solid slurry to gas/solid mixture; d) directing said gas/solid mixtur e into at least one stripper cyclone where solids are separated and stripped with carbon dioxide, and gases exit and are recycled, and thereafter e) recovering said solids comprising isomers of the alkali salt of the product dicarboxylic acid, unreacted feed, catalyst and trace coke for further purification.