Invention Grant
- Patent Title: Process for preparing precipitated silicas
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Application No.: US14367425Application Date: 2012-12-19
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Publication No.: US09725325B2Publication Date: 2017-08-08
- Inventor: Malika Clouin , Sylvaine Neveu , Joël Racinoux
- Applicant: RHODIA OPERATIONS
- Applicant Address: FR Paris
- Assignee: Rhodia Operations
- Current Assignee: Rhodia Operations
- Current Assignee Address: FR Paris
- Priority: FR1104090 20111223
- International Application: PCT/EP2012/076213 WO 20121219
- International Announcement: WO2013/092749 WO 20130627
- Main IPC: C01B33/12
- IPC: C01B33/12 ; C01B33/193

Abstract:
A process for preparing precipitated silica comprising a precipitation reaction between silicate and an acid, in which the acid used in at least one of the steps is a concentrated acid, preferably selected from the group consisting of sulfuric acid having a concentration of at least 80% by weight, in particular at least 90% by weight, acetic acid having a concentration of at least 90% by weight, formic acid having a concentration of at least 90% by weight, nitric acid having a concentration of at least 60% by weight, phosphoric acid having a concentration of at least 75% by weight, and hydrochloric acid having a concentration of at least 30% by weight.
Public/Granted literature
- US20150210555A1 Process for preparing precipitated silicas Public/Granted day:2015-07-30
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