公开(公告)号：US20140187411A1

公开(公告)日：2014-07-03

申请号：US14132801

申请日：2013-12-18

Applicant: PQ Corporation

Inventor： David Allen Cooper ,  Lay Hwa Ong ,  Ferry Winter ,  Laszlo Domokos ,  Wiebe Sjoerd Kijlstra ,  Sjoerd Alkema

IPC: B01J21/12

CPC classification number: B01J21/12 ,  B01J35/1019 ,  B01J35/1042 ,  B01J35/1047 ,  B01J37/0045 ,  B01J37/06 ,  C01B33/18 ,  C01F7/14 ,  C01F7/34 ,  C01P2002/50 ,  C01P2004/82 ,  C01P2006/12 ,  C01P2006/14

Abstract: A process for preparing a silica-alumina composition containing of from 30 to 70% wt silica and of from 70 to 30% wt of alumina, which process comprises (a) preparing an aqueous mixture containing aluminum sulfate and having a pH in the range of from 1.0 to 6.5; (b) adding alkali metal aluminate to the mixture obtained in step (a) to increase the pH of the mixture to within the range of from 7.1 to 12; (c) adding aluminum sulfate to the mixture obtained in step (b) to lower the pH of the mixture to within the range of from 1.5 to 6.5; (d) adding alkali metal silicate to the mixture obtained in step (c) to increase the pH of the mixture to within the range of from 6.5 to 11, (e) adding aluminum sulfate to the mixture obtained in step (d) to lower the pH of the mixture to within the range of from 1.5 to 6.5; wherein the final steps of the preparation process are (w) adding alkali metal silicate to a silica-alumina mixture obtained by step (a)-(e) to increase the pH of the mixture to within the range of from 5.0 to 8.5, (x) adding to the mixture obtained in step (w) (i) alkali metal aluminate to change the pH of the mixture to of from 7.8 to 12 and (ii) aluminum sulfate to change the pH of the mixture to within the range of from 1.5 to 7.7, wherein step (i) can precede or succeed step (ii), (y) treating the mixture obtained in step (x) with an alkaline solution having a pH of from 7.5 to 12, and (z) recovering a precipitate solid from the mixture obtained in step (y) to obtain a silica-alumina composition containing of from 30 to 70% wt silica and of from 70 to 30% wt of alumina.

Abstract translation: 一种制备含有30至70重量％二氧化硅和70至30重量％氧化铝的二氧化硅 - 氧化铝组合物的方法，该方法包括（a）制备含有硫酸铝的水性混合物，其pH值范围为 从1.0到6.5; （b）向步骤（a）中获得的混合物中加入碱金属铝酸盐以使混合物的pH值在7.1至12的范围内; （c）向步骤（b）中获得的混合物中加入硫酸铝以将混合物的pH降至1.5至6.5的范围; （d）向步骤（c）中获得的混合物中加入碱金属硅酸盐以将混合物的pH值提高到6.5至11的范围内，（e）向步骤（d）中获得的混合物中加入硫酸铝以降低 该混合物的pH在1.5至6.5的范围内; 其中制备方法的最后步骤是（w）将碱金属硅酸盐添加到通过步骤（a） - （e）获得的二氧化硅 - 氧化铝混合物中，以将混合物的pH提高到5.0-8.5的范围内 x）加入步骤（w）中获得的混合物（ⅰ）碱金属铝酸盐，将混合物的pH值改为7.8至12，和（ⅱ）硫酸铝将混合物的pH值改变到 1.5至7.7，其中步骤（i）可以在步骤（ii）之前或之后，（y）用pH为7.5至12的碱性溶液处理步骤（x）中获得的混合物，和（z）回收沉淀 从步骤（y）中获得的混合物中得到固体，得到含有30至70重量％二氧化硅和70至30重量％氧化铝的二氧化硅 - 氧化铝组合物。