GB1143787A - Alumina hydrate - Google Patents

Alumina hydrate

Info

Publication number
GB1143787A
GB1143787A GB850466A GB850466A GB1143787A GB 1143787 A GB1143787 A GB 1143787A GB 850466 A GB850466 A GB 850466A GB 850466 A GB850466 A GB 850466A GB 1143787 A GB1143787 A GB 1143787A
Authority
GB
Grant status
Application
Patent type
Prior art keywords
hydrate
alumina
water
gm
alumina hydrate
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
GB850466A
Inventor
John Henton Bass
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.)
Reynolds Metals Co
Original Assignee
Reynolds Metals 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

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01FCOMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00Compounds of aluminium
    • C01F7/02Aluminium oxide; Aluminium hydroxide; Aluminates
    • C01F7/04Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
    • C01F7/14Aluminium oxide or hydroxide from alkali metal aluminates
    • C01F7/141Aluminium oxide or hydroxide from alkali metal aluminates from aqueous aluminate solutions by neutralisation with an acidic agent
    • C01F7/142Aluminium oxide or hydroxide from alkali metal aluminates from aqueous aluminate solutions by neutralisation with an acidic agent with carbon dioxide
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01FCOMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00Compounds of aluminium
    • C01F7/02Aluminium oxide; Aluminium hydroxide; Aluminates
    • C01F7/04Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
    • C01F7/14Aluminium oxide or hydroxide from alkali metal aluminates
    • C01F7/141Aluminium oxide or hydroxide from alkali metal aluminates from aqueous aluminate solutions by neutralisation with an acidic agent
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2002/00Crystal-structural characteristics
    • C01P2002/60Compounds characterised by their crystallite size
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00Physical properties of inorganic compounds
    • C01P2006/12Surface area

Abstract

1,143,787. Hydrated alumina. REYNOLDS METAL CO. 25 Feb., 1966, No. 8504/66. Heading C1A. [Also in Divisions C3, C4 and C5] An alumina hydrate has from 1À4 to 1À6 mols. of water by mol. of alumina, an X-ray diffraction pattern similar to boehmite, a specific surface area of 300-600 sq. m/gm. and an average crystallite size in the range from 20-40 Š. Preferably the hydrate has an average particle diameter of 3-10 millimicrons, contains no more than 0À02% Na 2 O, and the area under the 28À1‹ 2# diffraction peak in the X-ray diffraction pattern is from 40% to 90% of the corresponding area for standard boehmite; the hydrate being able to absorb water even at low relative humidity which water may be desorbed simply by drying at 93À3 to 104À4‹ C. If the hydrate is decomposed in a bomb in the presence of water at a temperature of 160-200‹ C., a well crystallized α-alumina monohydrate is produced having a specific surface area in the range from 100-200 m<SP>2</SP>/gm. and a crystallite size in excess of 60Š. The alumina hydrate of the invention may be produced by a process in which (a) amorphous aluminium hydroxide is precipitated substantially free of crystalline alumina hydrate by reacting alkali metal aluminate solution with at least an approximately stoichiometric amount of an acid at a rate such that the precipitation of aluminium hydroxide is substantially completed by neutralization instead of by hydrolysis of the alkali metal aluminate, at a pH between 10 and 11 while maintaining the reaction temperature between 25 and 60‹ C, (b) the precipitate is separated from the mother liquor, washed and reslurried in an aqueous medium so that the precipitate is fully dispersed whilst its amorphous condition is retained, and (c) the slurried precipitate is aged at an elevated temperature until the amorphous aluminium hydroxide is converted into the crystalline alumina hydrate specified above. Preferably the alkali metal is sodium, and step (c) is followed by (d) filtering the aged slurry and (e) washing and drying the resulting filter cake. The sodium aluminate solution used may be stabilized by the presence of 0À2 to 1À0 gm. of SiO 2 per litre of solution and preferably have a ratio of Al 2 O 3 to free soda in the solution of from 0À5: 1 to 0À7: 1. The preferred neutralizing acid is CO 2 . The product may be coated, e.g. with stearic acid, surface esterified, e.g. isopropanol or butanol, and may be used as an absorbent, desiccant, a filler, for rubber and plastics, a coagulant for latex, and a pigment particularly when coloured organic dyes e.g. alizarin blue are adsorbed on to its surface. Further uses are as a bleaching agent and a catalyst support material.
GB850466A 1966-02-25 1966-02-25 Alumina hydrate Expired GB1143787A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB850466A GB1143787A (en) 1966-02-25 1966-02-25 Alumina hydrate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB850466A GB1143787A (en) 1966-02-25 1966-02-25 Alumina hydrate

Publications (1)

Publication Number Publication Date
GB1143787A true true GB1143787A (en) 1969-02-26

Family

ID=9853731

Family Applications (1)

Application Number Title Priority Date Filing Date
GB850466A Expired GB1143787A (en) 1966-02-25 1966-02-25 Alumina hydrate

Country Status (1)

Country Link
GB (1) GB1143787A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2355777A1 (en) * 1976-06-25 1978-01-20 Kaiser Aluminium Chem Corp Method of preparing alumina bauxite digestion
FR2520722A1 (en) * 1982-01-29 1983-08-05 Rhone Poulenc Spec Chim Boehmite and pseudo-
GB2248841A (en) * 1990-10-17 1992-04-22 Aei Cables Ltd Coloured polymeric material
EP0807603A2 (en) * 1996-05-16 1997-11-19 Sumitomo Chemical Company Limited Aluminum hydroxide, method for producing the same, and use of the same
EP1112961A1 (en) * 1999-12-27 2001-07-04 Sumitomo Chemical Company, Limited Aluminium hydroxide and tyre tread rubber composition and pneumatic tyre employing the aluminium hydroxide
WO2001064584A2 (en) * 2000-02-29 2001-09-07 Hydro Aluminium Deutschland Gmbh Method for producing an aluminium hydroxide gel
EP1932948A1 (en) * 2006-12-07 2008-06-18 Italtecno S.R.L. Apparatus and method for recovering caustic soda from caustic solutions

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2355777A1 (en) * 1976-06-25 1978-01-20 Kaiser Aluminium Chem Corp Method of preparing alumina bauxite digestion
FR2520722A1 (en) * 1982-01-29 1983-08-05 Rhone Poulenc Spec Chim Boehmite and pseudo-
EP0085592A1 (en) * 1982-01-29 1983-08-10 Rhone-Poulenc Chimie Boehmites and extremely pure pseudoboehmites, and process for their manufacture
GB2248841A (en) * 1990-10-17 1992-04-22 Aei Cables Ltd Coloured polymeric material
EP0807603A2 (en) * 1996-05-16 1997-11-19 Sumitomo Chemical Company Limited Aluminum hydroxide, method for producing the same, and use of the same
EP0807603A3 (en) * 1996-05-16 1998-03-25 Sumitomo Chemical Company Limited Aluminum hydroxide, method for producing the same, and use of the same
US6130283A (en) * 1996-05-16 2000-10-10 Sumitomo Chemical Company, Limited Aluminum hydroxide, method for producing the same, and method of use of the same
EP1112961A1 (en) * 1999-12-27 2001-07-04 Sumitomo Chemical Company, Limited Aluminium hydroxide and tyre tread rubber composition and pneumatic tyre employing the aluminium hydroxide
EP1329420A3 (en) * 1999-12-27 2004-03-17 Sumitomo Chemical Company, Limited Aluminium hydroxide and tyre tread rubber composition and pneumatic tyre employing the aluminium hydroxide
EP1329420A2 (en) * 1999-12-27 2003-07-23 Sumitomo Chemical Company, Limited Aluminium hydroxide and tyre tread rubber composition and pneumatic tyre employing the aluminium hydroxide
US6573323B2 (en) 1999-12-27 2003-06-03 Sumitomo Rubber Industries, Ltd. Aluminum hydroxide, and tire tread rubber composition and pneumatic tire employing the aluminum hydroxide
WO2001064584A3 (en) * 2000-02-29 2001-12-27 Vaw Ver Aluminium Werke Ag Method for producing an aluminium hydroxide gel
WO2001064584A2 (en) * 2000-02-29 2001-09-07 Hydro Aluminium Deutschland Gmbh Method for producing an aluminium hydroxide gel
EP1932948A1 (en) * 2006-12-07 2008-06-18 Italtecno S.R.L. Apparatus and method for recovering caustic soda from caustic solutions

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