公开(公告)号：JPS62105918A

公开(公告)日：1987-05-16

申请号：JP25597986

申请日：1986-10-29

Applicant: DEGUSSA

Inventor： KLEINSCHMIT PETER ,  KRIECHBAUM GANGOLF ,  STRACK HANS

IPC: C01B39/24 ,  C01B33/26 ,  C01B39/20

公开(公告)号：DE3538416A1

公开(公告)日：1987-05-07

申请号：DE3538416

申请日：1985-10-29

Applicant: DEGUSSA

Inventor： KLEINSCHMIT PETER ,  KRIECHBAUM GANGOLF ,  STRACK HANS

IPC: C01B39/24 ,  C01B33/26 ,  C01B39/20 ,  B01J29/08 ,  C10G11/05

Abstract: Precipitated silica is mixed with a solution of caustic soda, water and sodium aluminate to form a mixture of the composition: 12+/-3 Na2O:Al2O3:12+/-3 SiO2:200+/-60 H2O. This mixture was aged for 18-72 hours.

公开(公告)号：DE3685796D1

公开(公告)日：1992-07-30

申请号：DE3685796

申请日：1986-09-22

Applicant: DEGUSSA

Inventor： KLEINSCHMIT PETER ,  KRIECHBAUM GANGOLF ,  STRACK HANS

IPC: C01B39/24 ,  C01B33/26 ,  C01B39/20

Abstract: Prodn. of a seeding mixt. for faujasite synthesis comprises (i) diluting aq. NaOH soln. with water, while stirring, and heating to 50-80 deg.C; (ii) adding pptd. silicic acid; (iii) cooling the mixt. to 30-70 deg.C; (iv) adding aq. sodium aluminate soln. and then water, so as to give a mixt. of the compsn. 9-15 Na2O:Al2O3:9-15 SiO2:140-260 H2O; and (v) ageing the mixt. at 30-40 deg.C for 18-72 hrs. The concn. of the aq. NaOH is pref. about 50%. The pptd. silicic acid can be used as powder or filter cake; it has e.g. 6% drying loss (105 deg.C), 5% ignition loss (1000 deg.C); and Na2O content 1%. The sodium aluminate soln. contains 100-200 g/l Al2O3 and 150-300 g/l Na2O. The seeding mixt. is pref. stored at 35 deg.C. A tendency to gel after a certain period of storage causes no handling problems if the mixt. is stored in a stirred vessel.