PROCESS FOR PREPARING ESTERS OF CARBOXYLIC ACIDS

• Main Authors: DISTELDORF, WALTER, BESSLING, BERND, WELKER, RUDIGER, KNAB, JEAN WERNER, LOHE, BERND
• Format: Patent
• Language: English
• Published: 30.06.2006
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; APPARATUS THEREFOR; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; GENERAL METHODS OF ORGANIC CHEMISTRY; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; METALLURGY; ORGANIC CHEMISTRY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; THEIR RELEVANT APPARATUS; TRANSPORTING

A PROSES FOR PREPARING ESTERS FROM ALCOHOL AND CORBOXYLIC ASID BY A) FEEDING A MIXTURE, COMPRISING AT LEAST ALCOHOL AND/OR CORBOXYLIC ASID AS EDUCTS, INTO DISTILLATION COLUMN (8) WITH SEPARATED SECTIONS CONTAINING REACTIVE AND CONVENTIONAL INTERNALS, WHEREIN THE REACTIVE INTERNALS ARE ARRANGED BELOW THE INLET OF THE MIXTURE AND CONVENTIONAL INTERNALS ARE ARRANGED ABOVE THE INLET OF THE MIXTURE, B) REACTION OF THE ALCOHOL AND THE CORBOXYLIC ACID IN THE REACTIVE INTERNALS IN PRESENCE OF A CATALYST, C) DISTILLATIVE SEPARATION OF THE EVOLVING REACTION MIXTURE INTO THE HIGHER BOILING ESTER AND A LOWER BOILING AZEOTROPE CONTAINING ALCOHOL, WATER AND ESTER, WHEREIN THE ESTER ACCUMULATES IN THE BOTTOM AND AZZEOTROPE IS REMOVED OVERHEAD, D) SEPARATION OF THE IN A PHASE SEPARATOR (19) IN AN AQUEOUS PHASE AND IN AN ORGANIC PHASE AND THE ORGANIC PHASE TO BE RETURNED TO THE TOP OF THE COLUMN (8), WHEREIN IN STEP B) A HETEROGENOUS CATALYST IS UTILLIZED AND IN STEP IN STEP C) THE ESTER IS TAKEN OFF ABOVE THE BOTTOM AS PURE PRODUCT BETWEEN FURTHER CONVENTIONAL INTERNALS WHICH DIFFER IN THEIR ARRANGEMENT FROM THOSE IN STEP A) AND WHICH ARRANGED ABOVE THE INLET OF A CIRCULATING EVAPORATOR (10).FIG. 1