FR2443278A1 - Silica-alumina microspheres prodn. by oil-drop method - includes forming a silica sol by acidifying an alkali metal silicate soln. with a strong mineral acid and a weak organic acid - Google Patents

Silica-alumina microspheres prodn. by oil-drop method - includes forming a silica sol by acidifying an alkali metal silicate soln. with a strong mineral acid and a weak organic acid

Info

Publication number
FR2443278A1
FR2443278A1 FR7834590A FR7834590A FR2443278A1 FR 2443278 A1 FR2443278 A1 FR 2443278A1 FR 7834590 A FR7834590 A FR 7834590A FR 7834590 A FR7834590 A FR 7834590A FR 2443278 A1 FR2443278 A1 FR 2443278A1
Authority
FR
France
Prior art keywords
alkali metal
acid
silica
acidifying
metal silicate
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.)
Granted
Application number
FR7834590A
Other languages
French (fr)
Other versions
FR2443278B1 (en
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.)
Honeywell UOP LLC
Original Assignee
UOP LLC
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 UOP LLC filed Critical UOP LLC
Priority to FR7834590A priority Critical patent/FR2443278A1/en
Publication of FR2443278A1 publication Critical patent/FR2443278A1/en
Application granted granted Critical
Publication of FR2443278B1 publication Critical patent/FR2443278B1/fr
Granted legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/02—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops
    • B01J2/06—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops in a liquid medium
    • B01J2/08—Gelation of a colloidal solution
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
    • B01J21/12—Silica and alumina

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Silicon Compounds (AREA)
  • Silicates, Zeolites, And Molecular Sieves (AREA)
  • Colloid Chemistry (AREA)

Abstract

SiO2-Al2O3 microspheres are prepd. by (a) acidifying an aq. alkali metal silicate soln. with a strong mineral acid (I) and a weak organic acid (II), concn. of (I) being such as to provide an acid/alkali metal ratio of 0.75-1.0 and concn. of (II) being such as to increase this ratio by a factor of 1.3-2, (b) mixing with an acidic Al2O3 sol. and sufficient urea to effect 150-250% neutralisation of the acid anion content on hydrolysis of the urea to NH3, (c) dispersing the mixt. as droplets in a hot oil bath to form spheroidal hydrogel particles, (d) ageing the particles in the hot oil and (e) washing, drying and calcining. For use as a catalyst (support) in a fixed bed-type operation. Method ensures that firm hydrogel particles are formed which will retain their structural integrity during further processing.
FR7834590A 1978-12-08 1978-12-08 Silica-alumina microspheres prodn. by oil-drop method - includes forming a silica sol by acidifying an alkali metal silicate soln. with a strong mineral acid and a weak organic acid Granted FR2443278A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7834590A FR2443278A1 (en) 1978-12-08 1978-12-08 Silica-alumina microspheres prodn. by oil-drop method - includes forming a silica sol by acidifying an alkali metal silicate soln. with a strong mineral acid and a weak organic acid

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7834590A FR2443278A1 (en) 1978-12-08 1978-12-08 Silica-alumina microspheres prodn. by oil-drop method - includes forming a silica sol by acidifying an alkali metal silicate soln. with a strong mineral acid and a weak organic acid

Publications (2)

Publication Number Publication Date
FR2443278A1 true FR2443278A1 (en) 1980-07-04
FR2443278B1 FR2443278B1 (en) 1981-07-17

Family

ID=9215839

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7834590A Granted FR2443278A1 (en) 1978-12-08 1978-12-08 Silica-alumina microspheres prodn. by oil-drop method - includes forming a silica sol by acidifying an alkali metal silicate soln. with a strong mineral acid and a weak organic acid

Country Status (1)

Country Link
FR (1) FR2443278A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4206553A1 (en) * 1992-03-02 1993-09-09 Merck Patent Gmbh CLATHRASIL OF THE STRUCTURAL TYPE DODEKASIL 1 H WITH A SMALL MEDIUM CRYSTAL SIZE

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2582722A (en) * 1947-10-03 1952-01-15 Standard Oil Dev Co Preparation of silica-alumina bead catalyst
FR2261053A1 (en) * 1974-02-18 1975-09-12 Labofina Sa
FR2359641A1 (en) * 1976-07-26 1978-02-24 Uop Inc Spheroidal silica-alumina particles prodn. - from basic aluminium sulphate and acidic silica sol.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2582722A (en) * 1947-10-03 1952-01-15 Standard Oil Dev Co Preparation of silica-alumina bead catalyst
FR2261053A1 (en) * 1974-02-18 1975-09-12 Labofina Sa
FR2359641A1 (en) * 1976-07-26 1978-02-24 Uop Inc Spheroidal silica-alumina particles prodn. - from basic aluminium sulphate and acidic silica sol.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4206553A1 (en) * 1992-03-02 1993-09-09 Merck Patent Gmbh CLATHRASIL OF THE STRUCTURAL TYPE DODEKASIL 1 H WITH A SMALL MEDIUM CRYSTAL SIZE

Also Published As

Publication number Publication date
FR2443278B1 (en) 1981-07-17

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