公开(公告)号：US3794712A

公开(公告)日：1974-02-26

申请号：US3794712D

申请日：1971-10-26

Applicant: NAT PETRO CHEM

Inventor： KIRCH W ,  ABOUTBOUL H ,  KREKELER J

IPC: C01B33/154 ,  C01B33/16

CPC classification number: C01B33/154 ,  C01B33/1543

Abstract: SILICA GELS HAVING NARROW PORE DIAMETER DISTRIBUTION IN THE RANGE OF 300-600 A., SURFACE AREAS IN THE RANGE FROM 200-500 M.2/G., PORE VOLUMES OF FROM ABOUT 2.0 TO ABOUT 3.5 CM.3/G. AND THE PROCESS OF PREPARING SUCH SILICA GELS DIRECTLY FROM WATER, COMPRISING CRITICALLY CONTROLLED STEPS OF PRECIPITATION OF THE SILICA GEL, AGING THE PRECIPITATED SILICA HYDROGEL SLURRY, REDUCING THE ALKALINE IMPURITY LEVEL IN THE HYDROGEL BY WASHING THE AGED PRODUCT AND FREEZE DRYING THE HYDROGEL SO AS TO REMOVE SUBSTANTIALLY ALL OF THE WATER, I.E. VACUUM SUBLIMING THE WATER FROM THE GEL AFTER FREEZING SAID HYDROGEL PARTICLES AT A TEMPERATURE SUFFICIENT TO MAINTAIN THE WATER IN THE PORES IN THE FROZEN STATE.

公开(公告)号：US3819811A

公开(公告)日：1974-06-25

申请号：US23831372

申请日：1972-03-27

Applicant: NAT PETRO CHEM

Inventor： ABOUTBOUL H ,  KREKELER J ,  KIRCH W

IPC: B01J20/10 ,  B01J21/08 ,  B01J35/10 ,  C01B33/113 ,  C01B33/154 ,  C01B33/16

CPC classification number: C01B33/16 ,  B01J20/103 ,  B01J21/08 ,  B01J35/10 ,  B01J35/1019 ,  B01J35/1047 ,  B01J35/1061 ,  B01J35/1085 ,  C01B33/113 ,  C01B33/154 ,  C01B33/1543

Abstract: SILICA XEROGELS HAVING A NARROW PORE DIAMETER DISTRIBUTION IN THE RANGE OF 300-600A., SULFACE AREAS IN THE RANGE FROM 200 TO 500 M.2/G., AND PORE VOLUMES IN THE RANGE OF 2.0-3.5 CM.3/G. AND A PROCESS FOR PREPARING SUCH SILICA XEROGELS COMPRISING CRITICALLY CONTROLLED STEPS OF PRECIPITATION OF THE SILICA GEL, AGEING THE PRECIPITATED SILICA HYDROGEL SLURRY, WASHING THE AGED PRODUCT, AND REMOVING THE WATER FROM THE GEL WITH, WHERE NECESSARY, DURING THE GEL. THE WATER IS REMOVED IN SUCH A MANNER THAT THE SURFACE TENSION EXERTED UPON THE GEL, DURING DRYING, IS LESS THAN THAT SURFACE TENSION WHICH WOULD RESULT FROM THE DIRECT CONVERSION OF LIQUID WATER TO WATER VAPOR. TYPICAL TECHNIQUES WHICH MAY BE EMPLOYED ARE: (A) DISPLACING THE WATER IN GEL WITH AN ORGANIC LIQUID SUBSTANTIALLY COMPLETELY MISCIBLE WITH WATER AND THEN DRYING THE GEL; (B) VACUUM FREEZE-DRYING THE GEL; OR (C) ADDING A WATERIMMISCIBLE SOLVENT, WHICH FORMS AN AZEOTROPE WITH WATER WHEN DISTILLED, TO THE GEL, DISTILLING THE AZEOTROPE TO REMOVE SUBSTANTIALLY ALL OF THE WATER FROM HE GEL UNDER A SPECIFIC CONDITIONS AND DRYING THE GEL FROM ANY REMAINING SOLVENT.

公开(公告)号：US3801705A

公开(公告)日：1974-04-02

申请号：US3801705D

申请日：1971-10-26

Applicant: NAT PETRO CHEM

Inventor： ABOUTBOUL H ,  KREKELER J ,  KIRCH W

IPC: B01J20/10 ,  B01J21/08 ,  B01J35/10 ,  C01B33/113 ,  C01B33/154 ,  C01B33/16 ,  C01B33/12

CPC classification number: C01B33/16 ,  B01J20/103 ,  B01J21/08 ,  B01J35/10 ,  B01J35/1019 ,  B01J35/1047 ,  B01J35/1061 ,  B01J35/1066 ,  B01J35/1085 ,  C01B33/113 ,  C01B33/154 ,  C01B33/1543

Abstract: SILICA XEROGELS HAVING A NARROW PORE DIAMETER DISTRIBUTION IN THE RANGE OF 300-600 A., AND SURFACE AREAS IN THE RANGE OF FROM 200-500 M.2/G., PORE VOLUMES IN THE RANGE OF 2.0-3.5 CM.3/G. AND THE PROCESS OF PREPARING SUCH XEROGELS COMPRISING CRITICALLY CONTROLLED STEPS OF PRECITATION OF THE SILICA GEL, AGING THE PRECIPITATED SILICA HYDROGEL SLURRY, CONTROLLING THE LEVEL OF ALKALINE MATERIAL IN THE PRECIPITATED HYDROGEL SLURRY BY WASHING THE AGED PRODUCT AND DRYING THE GEL BY AZEOTROPIC DISTILLATION WITH A SOLVENT WHICH IS NON-MISCIBLE WITH WATER. ALSO, A PROCESS FOR PREPARING SUCH XEROGELS WHEREIN THE NON-WATER MISCIBLE SOLVENT IS CONTINUOUSLY RECYCLED SO THAT A MINIMUM AMOUNT OF SOLVENT NEED BE USED.

公开(公告)号：US3794713A

公开(公告)日：1974-02-26

申请号：US3794713D

申请日：1971-10-26

Applicant: NAT PETRO CHEM

Inventor： ABOUTBOUL H ,  KREKELER J ,  KIRCH W

IPC: B01J20/10 ,  B01J21/08 ,  B01J35/10 ,  C01B33/113 ,  C01B33/154 ,  C01B33/16

CPC classification number: C01B33/16 ,  B01J20/103 ,  B01J21/08 ,  B01J35/10 ,  B01J35/1019 ,  B01J35/1047 ,  B01J35/1061 ,  B01J35/1066 ,  B01J35/1085 ,  C01B33/113 ,  C01B33/154 ,  C01B33/1543

Abstract: Silica xerogels having narrow pore diameter distribution in the range of 300 - 600 A, surface areas in the range of from 200 500 m2/g, and pore volumes in the range of 2.0 - 3.5 cm3/g and process for preparing such silica xerogels comprising critically controlled steps of precipitation of the silica gel, aging the precipitated silica hydrogel slurry, washing the aged product, displacing the water with an organic liquid substantially completely miscible with water and drying the gel.

Abstract translation: 具有在300-600A范围内具有窄孔径分布，200-500m2 / g范围内的表面积和2.0-3.5cm 3 / g范围内的孔体积的二氧化硅干凝胶以及制备这种二氧化硅干凝胶的方法 包括严格控制的硅胶沉淀步骤，使沉淀的二氧化硅水凝胶淤浆老化，洗涤老化产物，用基本上完全与水混溶的有机液体置换水并干燥凝胶。