Nothing Special   »   [go: up one dir, main page]

GB1416139A - Fine silicas - Google Patents

Fine silicas

Info

Publication number
GB1416139A
GB1416139A GB5499671A GB5499671A GB1416139A GB 1416139 A GB1416139 A GB 1416139A GB 5499671 A GB5499671 A GB 5499671A GB 5499671 A GB5499671 A GB 5499671A GB 1416139 A GB1416139 A GB 1416139A
Authority
GB
United Kingdom
Prior art keywords
silica
particle size
microns
acid
neutralization
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB5499671A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Unilever PLC
Original Assignee
Unilever PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Unilever PLC filed Critical Unilever PLC
Priority to GB5499671A priority Critical patent/GB1416139A/en
Publication of GB1416139A publication Critical patent/GB1416139A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00—Silicon; Compounds thereof
    • C01B33/113—Silicon oxides; Hydrates thereof
    • C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
    • C01B33/18—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof
    • C01B33/187—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof by acidic treatment of silicates
    • C01B33/193—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof by acidic treatment of silicates of aqueous solutions of silicates
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/50—Agglomerated particles
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/51—Particles with a specific particle size distribution
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/60—Particles characterised by their size
    • C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/60—Particles characterised by their size
    • C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/12—Surface area
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/22—Rheological behaviour as dispersion, e.g. viscosity, sedimentation stability

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Silicon Compounds (AREA)

Abstract

1416139 Silica UNILEVER Ltd 22 Feb 1973 [26 Nov 1971] 54996/71 Heading C1A The invention comprises a precipitated silica having an ignition weight loss of at least 3% between 120‹ and 1000‹ C. and a strength such that a sample of the silica having a weight mean particle size on a substantially unimodal distribution in the size range 10 to 20 microns requires less than 6500 joules of ultrasonic energy (on a defined basis) to reduce the weight mean particle size of the sample to below 3 microns, which silica, after fluid energy milling, has a performance index (as defined) of at least 7. The silica is obtained by preparing primary silica particles by reacting, at a temperature between 85‹ C. and the boiling point, an aqueous alkali metal silicate solution and an acid to a degree of neutralization and SiO 2 concentration as indicated by Area A defined by points: 56, 6À6 ; 56, 2À8 ; 14, 1À0 ; 14, 2À8, flocculating the silica by the addition of an effective amount of an alkali metal salt, precipitating further silica in the presence of the salt by addition of further acid or acid and silicate and reducing the pH of the mixture to below 7, isolating the silica so produced and subjecting the silica to purification and single pass drying. The product may be subject to, e.g. fluid-energy milling to give a product in which at least 30% is less than 0À2 microns particle size. The preferred degree of neutralization is that shown in area B defined by the points: 56, 6À6 ; 56, 2À8 ; 14, 2À8.
GB5499671A 1971-11-26 1971-11-26 Fine silicas Expired GB1416139A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB5499671A GB1416139A (en) 1971-11-26 1971-11-26 Fine silicas

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5499671A GB1416139A (en) 1971-11-26 1971-11-26 Fine silicas

Publications (1)

Publication Number Publication Date
GB1416139A true GB1416139A (en) 1975-12-03

Family

ID=10472661

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5499671A Expired GB1416139A (en) 1971-11-26 1971-11-26 Fine silicas

Country Status (1)

Country Link
GB (1) GB1416139A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0243165A2 (en) * 1986-04-24 1987-10-28 Unilever Plc Porous silica structures
US4956167A (en) * 1986-02-28 1990-09-11 Unilever Patent Holdings B.V. Silicas
EP0588497A1 (en) * 1992-08-19 1994-03-23 JOSEPH CROSFIELD & SONS LTD. Process for preparing precipitated silicas

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4956167A (en) * 1986-02-28 1990-09-11 Unilever Patent Holdings B.V. Silicas
US5447704A (en) * 1986-02-28 1995-09-05 Unilever Patent Holdings B.V. Amorphous silica
EP0243165A2 (en) * 1986-04-24 1987-10-28 Unilever Plc Porous silica structures
EP0243165A3 (en) * 1986-04-24 1990-03-14 Unilever Plc Porous silica structures
EP0588497A1 (en) * 1992-08-19 1994-03-23 JOSEPH CROSFIELD & SONS LTD. Process for preparing precipitated silicas

Similar Documents

Publication Publication Date Title
ES437432A1 (en) Process for hydrophobization of finely divided silica and silicates using prepolycondensed organosilane
GB1284086A (en) Preparation of silica gels
GB1215928A (en) A process for reducing haze in beer
GB1236775A (en) Process for the production of modified silica and silicates
GB1073338A (en) Mixed coating process
GB1284087A (en) Preparation of silica gels
FR2451220A1 (en) PROCESS FOR PREPARING A CATALYTIC SILICA-ALUMINA HYDROGEL
GB1284085A (en) Preparation of silica gels
GB1216638A (en) Process for preparing micro-spheroidal desiccant silica gel
GB1232429A (en)
GB1144355A (en) Improvements in or relating to silicic acid production
GB1493567A (en) Process for preparation of granules containing viscous substances
GB1065733A (en) Fine aluminium hydroxides
BR8204939A (en) PROCESS FOR THE PRODUCTION OF COPPER HYDROXIDE II
GB1416139A (en) Fine silicas
GB1150764A (en) A process for the production of Sodium Aluminium Silicate Pigments
US3716493A (en) Process for making fine sized low density silica
GB1382340A (en) Production of precipitated silica
BR8502416A (en) PROCESS FOR THE PRODUCTION OF COPPER HYDROXIDE (II)
GB861378A (en) Production of new compositions from glyoxal and alkali metal silicates
GB1177169A (en) Improvements in or relating to Aluminosilicate
GB1482354A (en) Amorphous precipitated siliceous pigments and process for producing such pigments
GB488274A (en) Improvements in insoluble coloured products or pigments and process for manufacturing the same
GB1394586A (en) Preparation of calcium nitrate and phosphoric acid solutions
GB1134296A (en) Process for improving the freeness of asbestos

Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee