公开(公告)号：US3493609A

公开(公告)日：1970-02-03

申请号：US3493609D

申请日：1967-05-09

Applicant: BAYER AG

Inventor： KRONIG WALTER ,  SCHWERDTEL WULF ,  WEICHT BODO

IPC: C07C51/245 ,  C07C51/24 ,  C07C51/42

CPC classification number: C07C51/245 ,  C07C53/08

公开(公告)号：US3560586A

公开(公告)日：1971-02-02

申请号：US3560586D

申请日：1969-06-10

Applicant: BAYER AG

Inventor： KRONIG WALTER ,  SCHWERDTEL WULF ,  LOSACKER PAUL ,  WEICHT BODO

IPC: B01J21/16 ,  B01J21/20 ,  B01J27/00 ,  B01J27/18 ,  C07B61/00 ,  C07C1/00 ,  C07C1/247 ,  C07C11/18 ,  C07C67/00 ,  B01J11/82 ,  C07C1/20

CPC classification number: C07C11/18 ,  B01J21/16 ,  B01J21/20 ,  B01J27/1806 ,  C07C1/247 ,  C07C2527/173 ,  Y02P20/584 ,  Y10S585/906

Abstract: 4,4-DIMETHYL-M-DIOXANE IS DECOMPOSED INTO ISOPRENE IN THE GASEOUS PHASE IN A FLUIDIZED BED OVER A CATALYST CONTAINING PHOSPHORIC ACID AND PREPARED BY SUSPENDING A SILICIC ACID FILLER HAVING A SPECIFIC SURFACE OF 30 TO 200 M.2/G. AND A KAOLINITE, MONTMORILLONITE OR ATTAPULGITE CLAY IN AN AQUEOUS STABLE SILICIC ACID SOL HAVING A SPECIFIC SURFACE AREA OF 150 TO 400 M.2/G. (DRY BASIS); ADDING TO THE RESULTING SUSPENSION A SUFFICIENT AMOUNT OF AN AQUEOUS SUSPENSION OF MAGNESIUM OXIDE TO SET THE SUSPENSION INTO BEADS; DRYING THE BEADS; HEATING THE BEADS TO 500 TO 1,000* C. FOR AT LEAST 10 MINUTES; ADDING THERETO 5 TO 30% PHOSPHORIC ACID; AND FURTHER HEATING THEM TO 300 TO 650*C.