公开(公告)号：US3776947A

公开(公告)日：1973-12-04

申请号：US29581172

申请日：1972-10-10

申请人： NIPPON CATALYTIC CHEM IND

发明人： SHIMIZU N ,  YOSHIDA S ,  KUBOTA K ,  KOBAYASHI D ,  OHARA T

IPC分类号： C07C67/08 ,  C07C69/54

CPC分类号： C07C67/08 ,  C07C69/54

摘要： IN THE PROCESS FOR CONTINUOUSLY PREPARING ACRYLIC ACID ESTERS OR METHACRYLIC ACID ESTERS BY REACTING ACRYLIC ACID OR METHACRYLIC ACID WITH AN EXCESS OF EITHER METHANOL OR ETHANOL IN THE LIQUID PHASE IN THE PRESENCE OF AN ACIDIC CATALYST, THE METHOD CHARACTERIZED IN THAT THE ACRYLIC ACID OR METHACRYLIC ACID AND ALCOHOL ARE REACTED IN THE REACTION ZONE AT A MOLAR RATIO OF 1:1.2-5.0 AT A TEMPERATURE OF 40-100*C.; IN HEATING THE RESULTING REACTION PRODUCT IN AN EVAPORATING STILL TO DISTILL OFF THE ACRYLIC ACID ESTER OR METHACRYLIC ACID ESTER, WATER AND ALCOHOL, THE CONCENTRATION OF THE ACRYLIC ACID OR METHACRYLIC ACID OF THE BOTTOM LIQUID INSIDE THE EVAPORATING STILL IS MAINTAINED AT 10-40% BY WEIGHT; AND THE BOTTOM LIQUID IN AN AMOUNT OF AT LEAST 0.4 TIMES BY WEIGHT OF THE TOTAL AMOUNT OF THE ACRYLIC ACID OR METHACRYLIC ACID AND ALCOHOL FED TO THE REACTION ZONE IS RECYCLED FROM THEEVAPORATING STILL TO THE REACTION ZONE.