[go: up one dir, main page]

GB1015792A - Process for the preparation of dried silica, alumina and mixed silica-alumina gels - Google Patents

Process for the preparation of dried silica, alumina and mixed silica-alumina gels

Info

Publication number
GB1015792A
GB1015792A GB2548362A GB2548362A GB1015792A GB 1015792 A GB1015792 A GB 1015792A GB 2548362 A GB2548362 A GB 2548362A GB 2548362 A GB2548362 A GB 2548362A GB 1015792 A GB1015792 A GB 1015792A
Authority
GB
United Kingdom
Prior art keywords
gel
polymer
hydrous
alumina
dried
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
GB2548362A
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.)
Mini Of Mines & Technical Surv
Minister of Mines and Technical Surveys
Original Assignee
Mini Of Mines & Technical Surv
Minister of Mines and Technical Surveys
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 Mini Of Mines & Technical Surv, Minister of Mines and Technical Surveys filed Critical Mini Of Mines & Technical Surv
Publication of GB1015792A publication Critical patent/GB1015792A/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
    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/0009—Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
    • B01J37/0018—Addition of a binding agent or of material, later completely removed among others as result of heat treatment, leaching or washing,(e.g. forming of pores; protective layer, desintegrating by heat)
    • 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
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • 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
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/06—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04
    • 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
    • C01B33/14—Colloidal silica, e.g. dispersions, gels, sols
    • C01B33/157—After-treatment of gels

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Analytical Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Catalysts (AREA)
  • Silicon Compounds (AREA)

Abstract

A dried silica, alumina or mixed silica-alumina gel having controlled pore size distribution and controlled pore volume is prepared by mixing the appropriate hydrous gel with at least one water-soluble polymer selected from polyvinyl alcohol, polyethylene oxide or glycol, methyl cellulose or polyacrylamide, the total amount of polymer in the mixture being greater than 30% but not exceeding 20,000%, based on the weight of anhydrous oxide in the hydrous gel, with the provisio that when using hydrous silica gel alone the polymer is other than polyvinyl alcohol or polyacrylamide, drying the mixture at not exceeding 250 DEG C., preferably 200-250 DEG C., to set the pore structure of the gel, and finally treating, e.g. by calcination, combustion or hydrogenation, the dried gel to achieve substantially complete removal of the polymer from the dried gel. The polymer may either be dispersed in an aqueous solution of a salt which will yield a gel on precipitation, or it may be added to the hydrous mass of gel after precipitation. Calcining is preferably carried out at 500 DEG to 600 DEG C. in an inert atmosphere, which atmosphere is gradually replaced during calcining by an oxygen-containing atmosphere. After removal of the polymer the gel may be further ground and pelletized.ALSO:A dried, mixed silica-alumina gel having controlled pore size distribution in the range 105 to 20 radius, and controlled pore volume up to 5,0 ml./gm., which is prepared by mixing a hydrous mixed silica-alumina gel with at least one water soluble polymer selected from polyvinyl alcohol, polyethylene oxide or glycol, methyl cellulose or polyacrylamide, the total amount of polymer being greater than 30% but not exceeding 20,000%, based on the weight of the anhydrous oxides in the hydrous gel, drying the mixture at not exceeding 250 DEG C., preferably 200-250 DEG C., to set the pore structure of the gel, and finally treating, e.g. by calcination, combustion or hydrogenation, the dried gel to remove the polymer therefrom, may be used as a catalyst material.
GB2548362A 1961-07-03 1962-07-03 Process for the preparation of dried silica, alumina and mixed silica-alumina gels Expired GB1015792A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US12154961A 1961-07-03 1961-07-03

Publications (1)

Publication Number Publication Date
GB1015792A true GB1015792A (en) 1966-01-05

Family

ID=22397417

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2548362A Expired GB1015792A (en) 1961-07-03 1962-07-03 Process for the preparation of dried silica, alumina and mixed silica-alumina gels

Country Status (1)

Country Link
GB (1) GB1015792A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2267486A (en) * 1992-06-02 1993-12-08 British Gas Plc Porous amorphous silica-alumina
US5871646A (en) * 1992-06-02 1999-02-16 British Gas Plc Porous amorphous silica-alumina refractory oxides, their preparation and use as separation membranes

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2267486A (en) * 1992-06-02 1993-12-08 British Gas Plc Porous amorphous silica-alumina
GB2267486B (en) * 1992-06-02 1996-02-14 British Gas Plc Porous amorphous silica-alumina refractory oxides, their preparation and use as separation membranes
US5871646A (en) * 1992-06-02 1999-02-16 British Gas Plc Porous amorphous silica-alumina refractory oxides, their preparation and use as separation membranes
US6042727A (en) * 1992-06-02 2000-03-28 British Gas Plc Porous amorphous silica-alumina refractory oxides, their preparation and use as separation membranes

Similar Documents

Publication Publication Date Title
Greenland Adsorption of polyvinyl alcohols by montmorillonite
NO308218B1 (en) Catalyst support, process for the preparation of a precursor gel for a catalyst support, and use of the catalyst
AT309819B (en) Process for the preparation of stable, aqueous copolymer dispersions from vinyl esters and ethylene
JPS5214689A (en) Process for preparing a macromolecular material excellent in water abs orption properties
GB1065733A (en) Fine aluminium hydroxides
DE3581623D1 (en) Acidic agglomeration of a refractory gel in a polar organic diluent.
ES484964A1 (en) Process for cross-linking carboxymethyl cellulose and products obtained by this process.
GB1015792A (en) Process for the preparation of dried silica, alumina and mixed silica-alumina gels
ES404748A1 (en) Process for preparing injectionable compositions
GB1069455A (en) Process for the preparation of porous alumina
GB934087A (en) Method of manufacturing water soluble polyvinyl alcohol derivatives
GB1303414A (en)
GB1257043A (en)
JPS5227455A (en) Process for preparing a high polymer material having water absorption properties
GB668968A (en) Colloidal iodine preparation and method of making the same
US3109847A (en) Oxazoline modified clay
JPS5679629A (en) Preparation of isobutylene oligomer
SU489775A1 (en) Composition for temporary protection of semiconductor wafers
JPS5734015A (en) Production of cordierite composition powder
JPS5645823A (en) Pseudo-boehmite type alumina hydrate and its manufacture
NL7412336A (en) PROCESS FOR THE PREPARATION OF CARBONIC ACID GROUPS-CONTAINING HYDROCARBON RESINS AND THEIR USE AS A BINDING AGENT.
GB939214A (en) Methods of preparing cracking catalyst and use thereof
JPS5340038A (en) Preparation of microhydrogel
GB637622A (en) A new process for the manufacture of lead silicate
SU812417A1 (en) Pickup preventing paint for casting moulds and cores