EP0796224A1 - Verfahren zur reinigung von aluminiumoxid mittels extraktion - Google Patents
Verfahren zur reinigung von aluminiumoxid mittels extraktionInfo
- Publication number
- EP0796224A1 EP0796224A1 EP95918629A EP95918629A EP0796224A1 EP 0796224 A1 EP0796224 A1 EP 0796224A1 EP 95918629 A EP95918629 A EP 95918629A EP 95918629 A EP95918629 A EP 95918629A EP 0796224 A1 EP0796224 A1 EP 0796224A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- organic
- aluminium oxide
- impure
- solvent
- dissolving
- 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.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B15/00—Peroxides; Peroxyhydrates; Peroxyacids or salts thereof; Superoxides; Ozonides
- C01B15/01—Hydrogen peroxide
- C01B15/022—Preparation from organic compounds
- C01B15/023—Preparation from organic compounds by the alkyl-anthraquinone process
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/48—Halides, with or without other cations besides aluminium
- C01F7/56—Chlorides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/68—Aluminium compounds containing sulfur
- C01F7/74—Sulfates
Definitions
- US patent specification 3 814 701 sets out removal of orgamc matter from spent alumimum oxide deriving from an anthraquinone working solution by calcinating sduminium oxide at a temperature of 300-400 °C.
- the organic matter adsorbed into aluminium oxide will be removed by combustion during calcination.
- the calcinated alumimum oxide is then subjected to caustic treatment and recalculation. Nonetheless, treated in this way, aluminium oxide is highly dusting if recycled in the H2O2 process.
- the invention relates to a new method for purifying impure aluminium oxide, which has been used in hydrogen peroxide preparation for the adsorption of organic components.
- the method of the invention makes it possible to obtain a perfectly pure aluminium salt, such as aluminium sulphate or aluminium chloride, which is even purer than commercially available products.
- aluminium salts prepared with this method are well suited to be used as raw materials in industrial applications, particularly the alruninium salts are suitable to be employed as water purification and retention chemicals.
- the impure aluminium oxide can be prewashed with an organic hydrocarbon solvent before thermal treatment.
- the washing solvent may consist of any organic hydrocarbon capable of dissolving the organic component forming an impurity in aluminium oxide.
- a preferred embodiment uses Shellsol AB as a solvent, which is a commercially available product containing mainly CJO-CI J aromatic hydrocarbons. Prewashing allows those organic useful components to be extracted from aliiminium oxide which are recyclable directly to the hydrogen peroxide process. Moreover, prewashing allows the amount of burnt organic matter to be reduced and simultaneously the organic compounds to be recirculated in the hydrogen peroxide process.
- the acid dissolving-extraction step comprises dissolving ground _d__minium oxide in a concentrated acid solution. Any concentrated mineral acid is appropriate for dissolving, however, sulphuric and hydrochloric acid are recommended. Sulphuric acid used in a 50-60% by weight concentration is considered particularly suitable.
- the dissolving is appropriately enhanced by heating. To ensure nearly complete dissolving of aluminium oxide it is recommended to heat the mixture to a temperature of about 100-160 °C, while stirring for several hours. In the course of dissolving, the organic component contained in aluminium oxide is separated into a separate phase on the surface of the aqueous phase. The reaction mixture is diluted with water to prevent aluminium salts from crystallising. Separation of organic components is enhanced by extracting by means of either entirely pure or entirely recycled, or partly recycled and partly pure organic solvent.
- the extraction solvent may consist of any organic hydrocarbon capable of dissolving organic components from aluminium oxide.
- a preferred embodiment uses Shellsol AB as a solvent, which is a commercially available product containing mainly Cjo-Cn aromatic hydrocarbons.
- Toluene is a particularly advantageous solvent, which after the phase separation can be easily distillated from the organic phase and returned to the step following dissolution.
- the recycled organic solvent to be returned to the extraction step can, if desired, be purified after the phase separation, and if necessary, enhanced with a pure solvent.
- the phases are allowed to separate. Impurities in the organic phase settled on the surface mainly contain organic components deriving from the apatinium oxide and possibly also organic solvents used in extraction.
- the organic phase is partly returned to the extraction step and partly conducted to a combustion plant. If desired, the portion returned to the extraction step can be purified, for instance by distillation.
- impure aluminium oxide is ground and subsequently dissolved in an acid.
- Organic impurities are separated as an organic phase.
- the mixture is diluted with water, and the separation of organic impurities is enhanced with extraction by using recycled and/or pure organic solvents.
- After the phase separation a portion of the organic phase is conducted to a combustion plant and another portion is recycled to the extraction step.
- the aqueous phase is filtered or centrifugated. Undissolved components from the aquoeus phase are returned to the dissolving step and the filtrate is used as such or is further purified.
- the insoluble precipitate was separated from the aqueous phase deriving from the extraction step either by filtering or by centrifugating.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Extraction Or Liquid Replacement (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI942338A FI98508C (fi) | 1994-05-20 | 1994-05-20 | Menetelmä epäpuhtaan alumiinioksidin puhdistamiseksi uuttamalla |
FI942338 | 1994-05-20 | ||
PCT/FI1995/000272 WO1995032152A1 (en) | 1994-05-20 | 1995-05-19 | Method for purifying impure aluminium oxide by extraction |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0796224A1 true EP0796224A1 (de) | 1997-09-24 |
Family
ID=8540737
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95918629A Withdrawn EP0796224A1 (de) | 1994-05-20 | 1995-05-19 | Verfahren zur reinigung von aluminiumoxid mittels extraktion |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0796224A1 (de) |
JP (1) | JPH10500931A (de) |
FI (1) | FI98508C (de) |
WO (1) | WO1995032152A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI103401B (fi) * | 1996-04-12 | 1999-06-30 | Kemira Chemicals Oy | Menetelmä epäpuhtaan alumiinioksidin käsittelemiseksi |
CN105836865B (zh) * | 2016-06-04 | 2018-05-15 | 江阴市长江化工有限公司 | 一种聚合氯化铝的制备工艺 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI80869C (fi) * | 1988-05-27 | 1990-08-10 | Nokia Oy Ab | Utfaellnings- coh limningsaemne samt foerfarande foer dess framstaellning. |
DE4027159A1 (de) * | 1990-08-28 | 1992-03-05 | Niermann Hermann Dr | Verfahren und vorrichtung zur reinigung und wiederaufbereitung von aluminiumoxid |
-
1994
- 1994-05-20 FI FI942338A patent/FI98508C/fi active
-
1995
- 1995-05-19 EP EP95918629A patent/EP0796224A1/de not_active Withdrawn
- 1995-05-19 WO PCT/FI1995/000272 patent/WO1995032152A1/en not_active Application Discontinuation
- 1995-05-19 JP JP7530075A patent/JPH10500931A/ja active Pending
Non-Patent Citations (1)
Title |
---|
See references of WO9532152A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1995032152A1 (en) | 1995-11-30 |
FI98508C (fi) | 1997-07-10 |
FI98508B (fi) | 1997-03-27 |
JPH10500931A (ja) | 1998-01-27 |
FI942338A (fi) | 1995-11-21 |
FI942338A0 (fi) | 1994-05-20 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19961120 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE FR GB SE |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
18W | Application withdrawn |
Withdrawal date: 19980203 |