GB1158742A - Production of Microspheres - Google Patents

Production of Microspheres

Info

Publication number
GB1158742A
GB1158742A GB4798566A GB4798566A GB1158742A GB 1158742 A GB1158742 A GB 1158742A GB 4798566 A GB4798566 A GB 4798566A GB 4798566 A GB4798566 A GB 4798566A GB 1158742 A GB1158742 A GB 1158742A
Authority
GB
United Kingdom
Prior art keywords
microspheres
ammonia
medium
water
aquasol
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
GB4798566A
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.)
WR Grace and Co
Original Assignee
WR Grace and Co
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
Priority claimed from US449867A external-priority patent/US3312632A/en
Priority claimed from US506231A external-priority patent/US3345437A/en
Application filed by WR Grace and Co filed Critical WR Grace and Co
Publication of GB1158742A publication Critical patent/GB1158742A/en
Expired 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
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)
  • Manufacturing Of Micro-Capsules (AREA)
  • Carbon And Carbon Compounds (AREA)

Abstract

1,158,742. Microspheres of metal oxides and carbides. W. R. GRACE & CO. 26 Oct., 1966 [3 Nov., 1965], No. 47985/66. Addition to 1,125,915. Heading C1A. [Also in Division G6] Metal oxide microspheres are produced from the corresponding aquasols by forming droplets of the sol in a dehydrating medium which contains ammonia, and recovering the formed microspheres. The pH of the medium is preferably 8-13À5. The medium preferably has a solubility for water of 1-30 wt. per cent under process conditions, and suitably comprises a C 4-10 alcohol. The ammonia can be introduced into the medium by dissolving gaseous ammonia therein or by adding aqueous ammonia thereto. The aquasol optionally contains an " ammonia-releasing agent " (see Specification 1,125,915). The sol droplets are preferably maintained in contact with the dehydrating medium until their water content is less than 50 wt, per cent of their solids content, and the resulting microspheres are washed with ammonia and with water, and dried. The microspheres obtained have a diameter of 50- 300 microns and may subsequently be sintered. Metal oxides listed are UO 2 , UO 3 , ThO 2 , PuO 2 , PuO 3 , ZrO 2 , BeO, Y 2 O 3 and mixtures thereof. By mixing colloidal carbon with the aquasol, microspheres are obtained comprising an intimate mixture of metal oxide and carbon, and these are convertible to metal carbide microspheres.
GB4798566A 1965-04-21 1966-10-26 Production of Microspheres Expired GB1158742A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US449867A US3312632A (en) 1965-04-21 1965-04-21 Method for making metal oxide microspheres
US506231A US3345437A (en) 1965-11-03 1965-11-03 Sol-gel microsphere forming process using dissolved ammonia in the dehydrating solvent

Publications (1)

Publication Number Publication Date
GB1158742A true GB1158742A (en) 1969-07-16

Family

ID=27035846

Family Applications (2)

Application Number Title Priority Date Filing Date
GB1716966A Expired GB1125915A (en) 1965-04-21 1966-04-19 Production of microspheres
GB4798566A Expired GB1158742A (en) 1965-04-21 1966-10-26 Production of Microspheres

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB1716966A Expired GB1125915A (en) 1965-04-21 1966-04-19 Production of microspheres

Country Status (3)

Country Link
DE (2) DE1542179B1 (en)
GB (2) GB1125915A (en)
NL (2) NL6605275A (en)

Also Published As

Publication number Publication date
GB1125915A (en) 1968-09-05
NL6605275A (en) 1966-10-24
DE1542191A1 (en) 1971-02-25
DE1542179B1 (en) 1970-11-12
NL6615444A (en) 1967-05-05

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Legal Events

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