Invention Grant
- Patent Title: Process for preparing precipitated silica
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Application No.: US14373799Application Date: 2013-01-23
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Publication No.: US10011494B2Publication Date: 2018-07-03
- Inventor: Emmanuelle Allain , Sylvaine Neveu
- Applicant: RHODIA OPERATIONS
- Applicant Address: FR Paris
- Assignee: Rhodia Operations
- Current Assignee: Rhodia Operations
- Current Assignee Address: FR Paris
- Priority: FR1200213 20120125
- International Application: PCT/EP2013/051237 WO 20130123
- International Announcement: WO2013/110658 WO 20130801
- Main IPC: C01B33/12
- IPC: C01B33/12 ; C01B33/193

Abstract:
A process for preparing precipitated silica in which: (i) an aqueous stock having a concentration of alkali metal silicate less than 20 g/L is formed; (ii) acid is added to said initial stock, until at least 50% of the amount of M2O is neutralized; (iii) silicate and acid are simultaneously added, such that the degree of consolidation is greater than 4 and at most 100; (iv) silicate and acid are simultaneously added, such that the pH of the reaction medium is between 7 and 10; (v) acid is added until a pH value of between 2.5 and 5.3 is obtained; and (vi) the reaction medium is placed in contact with acid and silicate, such that the pH is between 2.5 and 5.3, wherein the acid used in at least one of the process steps is a concentrated acid.
Public/Granted literature
- US20150266743A1 Process for preparing precipitated silica Public/Granted day:2015-09-24
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