GB2048842A - Process for the Preparation of Inorganic Peroxides - Google Patents
Process for the Preparation of Inorganic Peroxides Download PDFInfo
- Publication number
- GB2048842A GB2048842A GB8014089A GB8014089A GB2048842A GB 2048842 A GB2048842 A GB 2048842A GB 8014089 A GB8014089 A GB 8014089A GB 8014089 A GB8014089 A GB 8014089A GB 2048842 A GB2048842 A GB 2048842A
- Authority
- GB
- United Kingdom
- Prior art keywords
- peroxide
- oxide
- hydrogen peroxide
- hydroxide
- suspension
- 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
Links
- 150000002978 peroxides Chemical class 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims description 46
- 238000002360 preparation method Methods 0.000 title claims description 8
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000000725 suspension Substances 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims abstract description 21
- 238000006243 chemical reaction Methods 0.000 claims abstract description 15
- 150000001340 alkali metals Chemical class 0.000 claims abstract description 13
- 229910052783 alkali metal Inorganic materials 0.000 claims abstract description 9
- 238000001694 spray drying Methods 0.000 claims abstract description 7
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims abstract description 5
- 150000001342 alkaline earth metals Chemical class 0.000 claims abstract description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract 2
- 238000002156 mixing Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 239000007921 spray Substances 0.000 claims description 8
- 229910000272 alkali metal oxide Inorganic materials 0.000 claims description 4
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 claims description 4
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 2
- 239000000395 magnesium oxide Substances 0.000 claims description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical group [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims 1
- 239000000292 calcium oxide Substances 0.000 claims 1
- 229910052744 lithium Inorganic materials 0.000 claims 1
- 239000011541 reaction mixture Substances 0.000 abstract description 11
- 238000003756 stirring Methods 0.000 abstract description 4
- HPGPEWYJWRWDTP-UHFFFAOYSA-N lithium peroxide Chemical compound [Li+].[Li+].[O-][O-] HPGPEWYJWRWDTP-UHFFFAOYSA-N 0.000 abstract description 3
- 239000008187 granular material Substances 0.000 abstract description 2
- 239000002245 particle Substances 0.000 abstract description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 abstract 1
- 229910052791 calcium Inorganic materials 0.000 abstract 1
- 239000011575 calcium Substances 0.000 abstract 1
- 229910052749 magnesium Inorganic materials 0.000 abstract 1
- 239000011777 magnesium Substances 0.000 abstract 1
- 239000000047 product Substances 0.000 description 12
- 239000002002 slurry Substances 0.000 description 10
- 238000001035 drying Methods 0.000 description 9
- 239000004343 Calcium peroxide Substances 0.000 description 8
- 235000019402 calcium peroxide Nutrition 0.000 description 8
- LHJQIRIGXXHNLA-UHFFFAOYSA-N calcium peroxide Chemical compound [Ca+2].[O-][O-] LHJQIRIGXXHNLA-UHFFFAOYSA-N 0.000 description 7
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 6
- 239000000920 calcium hydroxide Substances 0.000 description 6
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 6
- 238000001816 cooling Methods 0.000 description 6
- 150000004974 alkaline earth metal peroxides Chemical class 0.000 description 5
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- SPAGIJMPHSUYSE-UHFFFAOYSA-N Magnesium peroxide Chemical compound [Mg+2].[O-][O-] SPAGIJMPHSUYSE-UHFFFAOYSA-N 0.000 description 2
- -1 alkaline earth metal salt Chemical class 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229960004995 magnesium peroxide Drugs 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000000376 reactant Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000003808 active oxygen stabilizer Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012527 feed solution Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910000000 metal hydroxide Inorganic materials 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000012452 mother liquor Substances 0.000 description 1
- 125000000864 peroxy group Chemical group O(O*)* 0.000 description 1
- 230000000144 pharmacologic effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- C01B15/04—Metal peroxides or peroxyhydrates thereof; Metal superoxides; Metal ozonides; Peroxyhydrates thereof
- C01B15/043—Metal peroxides or peroxyhydrates thereof; Metal superoxides; Metal ozonides; Peroxyhydrates thereof of alkali metals, alkaline earth metals or magnesium or beryllium or aluminium
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Fertilizers (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
Abstract
An alkali metal or alkaline earth metal peroxide, for example calcium, magnesium or lithium peroxide, is produced by reaction between a concentrated suspension of the corresponding oxide or hydroxide and hydrogen peroxide, preferably maintaining the reaction mixture with stirring until the reaction has gone to completion, and direct spray drying of the peroxide suspension formed, if desired after partial dewatering. The product occurs directly as free flowing granules of a narrow and uniform particle size, and is chemically homogeneous.
Description
SPECIFICATION
Process for the Preparation of Inorganic
Peroxides
The present invention relates to a process for the preparation of inorganic peroxides and, more particularly, alkali metal or alkaline earth metal peroxides.
Alkali metal and alkaline earth metal peroxides are being used to an increasing extent in industry.
For example, alkaline earth metal peroxides are used for medicinal and pharmacological purposes and in the cosmetics industry. Recently, calcium peroxide has become of increasing importance in applications related to the improvement of the growth of cultivated plants. Such peroxy compounds is also being utilised in effluent technology because of their potential for slow release of oxygen.
Alkali metal and alkaline earth metal peroxides are, generally, prepared from a peroxidecontaining reaction mixture comprising an aqueous solution of an alkali metal or alkaline earth metal salt, oxide or hydroxide by reaction with an aqueous solution of hydrogen peroxide, centrifuging or filtering the reaction mixture and drying the recovered solids on racks. The dried material is, usually, milled and possibly, sieved.
German Offenlegungsschrift No. 1 542642 discloses a process for the preparation of calcium peroxide, in which process a very dilute solution of hydrogen peroxide is allowed to react with an excess of calcium hydroxide at a temperature below 300C to form calcium peroxide octahydrate which is then converted to the anhydrous form in an additional drying stage.
The above described processes have a number of inherent disadvantages. They are expensive because of the need to mill the dried product.
Moreover, there are substantial losses of peroxide resulting from the decomposition of hydrogen peroxide in the large quantity of mother liquor resulting from the use of a relatively dilute reaction mixture, and during the drying process as a result of the long residence time required.
Moreover, due to the use of a dilute reaction mixture, a large quantity of water may have to be transported, and removed from the peroxide in a drying stage which has a high energy requirement resulting in an unnecessary waste of energy.
Furthermore, additional regulating devices are necessary for temperature control and additional process stages are needed to remove the excess of, for example, calcium hydroxide used for example, in the process described in German
Offenlegungsschrift No. 1 542642. The finished product may also show a certain lack of homogeneity, caused by decomposition, during the drying and subsequent milling stages.
The invention relates to a new or improved process for the preparation of alkali metal or alkaline earth metal peroxides.
The invention provides a process for the preparation of an alkali metal or alkaline earth metal peroxide comprising forming a mixture of a concentrated aqueous alkali metal or alkaline earth metal oxide or hydroxide suspension and an aqueous hydrogen peroxide solution, allowing the oxide or hydroxide to react with the hydrogen peroxide to form the corresponding peroxide and spray drying the resulting peroxide suspension.
Preferably, the mixture of the oxide or hydroxide suspension and the hydrogen peroxide solution is maintained, with mixing, until the reaction between them is complete.
Surprisingly, it has been found to be advantageous to operate with as concentrated a suspension as possible, and drying immediately and carefully without further process stages. The oxide or hydroxide suspension to be used should have a high solids concentration, preferably so high that the suspension is still just pumpable.
The solids concentration of this suspension is, preferably, adjusted according to the oxide or hydroxide to be used, but it is, preferably, greater than 200 gIl and, particularly preferably, greater than 300 g/l.
The oxide or hydroxide suspension to be used can be prepared, for example, by simultaneously metering water and commercial oxide or hydroxide powder into a reaction vessel, with stirring. in a preferred embodiment of the process, the suspension, heated spontaneously by the exothermic solution process, is mixed directly with hydrogen peroxide without any intermediate cooling.
The hydrogen peroxide solution to be used may be a normal commercial product, which may also contain known active oxygen stabilisers. It is advisable to seiect a hydrogen peroxide concentration greater than 50% by wt. and preferably greater than 65% by wt. so that the reaction mixture does not become too strongly diluted.
One preferred method for carrying out the process according to the invention will now be described.
The relevant alkali metal or alkaline earth metal oxide or hydroxide may be formed into a slurry using as little water as possible and the resulting suspension mixed, if necessary with cooling, with an aqueous hydrogen peroxide solution, suitably in a device giving intensive mixing. The resulting mixture of the oxide or hydroxide suspension and the hydrogen peroxide solution is, preferably, maintained until the reaction is complete or until the optimum conversion has been achieved; with further cooling if necessary, and, preferably, at a temperature of from 200C to 800 C, particularly preferably from 300C to 500C. Preferably the reaction mixture is maintained in a kneading device, for example in a conical screw mixer, in which it may be kneaded for from 0 to 3 hours, preferably for from 0 to 0.5 hours.The device giving intensive mixing in which the oxide or hydroxide suspension and the hydrogen peroxide solution may be mixed is, suitably, a rapdily rotating eccentric pump, for example an impeller mixer, possibly fitted with a cooling jacket.
It is advantageous to remove a part of the water content from the reaction mixture after combining and mixing the reaction constituents, preferably to a water content of not more than about 40% by weight, suitably in a centrifuge. The thick peroxide suspension or paste resulting from the reaction may be transported by means of a screw pump. A spray drier with a rapidly rotating disc has proved advantageous for drying the peroxide product. Preferably the spray drier is operated at an inlet temperature of from 1 500C to 600 C and an outlet temperature from 60 C to 120 C.
The process according to the present invention has the following advantages: a) By using approximately stoichiometric quantities of reactants, preferably not varying from the stoichiometric by more than 10%, and operating with a concentrated reaction mixture, the proportion of ballast to be incorporated (e.g.
water, excess reactants) can be kept extremely low.
b) Direct spray drying of the reaction mixture renders expensive separating and washing stages unnecessary. moreover, the product occurs directly as free-flowing granules and does not have to be treated subsequently in additional comminution devices.
c) The process can be carried out either on a continuous or on discontinuous basis.
The product obtained according to the process of the invention may have certain advantages.
a) Due to the reduction of localised decomposition reactions the product may have satisfactory homogeneity,
b) Due to the spray drying procedure, good free-flowing properties, an even crystal structure and a narrow and, uniform grain size range may be obtained.
c) Due to the intensive drying procedure, crystailine anhydrous peroxides may be obtained.
The operation of the process is illustrated by
Figure 1 which is a flow diagram. In Figure 1, (1) is a mixing device for preparing the metal oxide or hydroxide (MeO/Me(OH)2) suspension, and the hydrogen peroxide solution is kept in a storage vessel (2). The feed solutions are mixed in an intensive mixing device (3) and passed via a cooler (4) into a conical screw mixer (5). The residence time in the mixer (5) may be O to 3 hours, preferably, 0 to 0.5 hours, depending on the method of operation. The reaction product isdrawn off continuously from the mixer (5) via a screw pump (6) and is passed to a spray drier (7) for spray drying.In a particular embodiment of the process according to the invention, there is the possibility of drawing off part of the reaction mixture, for example via a by-pass (8) before the entrance to the cooler (4), and returning it to the mixing device (3) in order to accelerate the onset of the reaction. The mixing devices (1 ) and (3) may be equipped with cooling devices.
The process according to the invention is illustrated but not restricted, by means of the following examples.
Example 1
By simultaneously metering water and calcium hydroxide powder into a vessel (1), with stirring, a calcium hydroxide suspension having a concentration of 50% by wt. is prepared. A 70% by wt. aqueous solution of hydrogen peroxide stabilised with 300 mg P043-/1 is kept in supply vessel (2). A quantity of 660 kg per hr. of the calcium hydroxide suspension from (1) and a quantity of 186 1/hr of the hydrogen peroxide solution from (2) is fed, by means of a screw pump and a piston metering pump respectively, through a rapid mixer pump (Supraton 207) (3) where a reaction takes place. (Supraton is a Trade
Mark). In this way, a quantity of 900 kg per hr. of calcium peroxide slurry is produced, with heat evolution.
The slurry is cooled to a temperature of 308K in a thin film heat exchanger (4) which is a vertically arranged water-cooled double cylinder in which the slurry to be cooled is thrown by means of stirring devices to the cooling surfaces, whence it then flow downwards in a cooled state.
From the heat exchanger (4) it flows into a screw mixer (5). From there the calcium peroxide slurry is passed, by means of a screw pump (6) to a spray drier (7). The drying temperatures are adjusted to the constant product stream and are 473K at the dryer entrance and 348K at the dryer outlet. The product thus obtained (324 kg/hr) contains 76.4% by wt of calcium peroxide. It can be seen from the electron scanning microscope photograph art a scale of 1000:1 (Fig. 2) that the average grain size diameter is 5 microns and that approximately 90% of the particles have a diameter of between 2 and 7 microns.
Example 2
Using a similar method of operation to that described in Example 1, a quantity of 496 kg/hr.
of a 25% by wt. magnesium oxide suspension and 60 1 per hr. of a 70% by wt. hydrogen peroxide solution is fed through the mixer pump for reaction.
After passing through the mixer pump, a part of the mixture (30% by vol.) is returned to the mixer pump via a by-pass (8) in order to accelerate the onset of the reaction. The resulting magnesium peroxide slurry (573 kg per hr) is cooled, as described in Example 1, stored temporarily in a screw mixer, and dried in a spray drier. The product thus obtained (122 kg per hr) contains 45.8% by wt. magnesium peroxide.
Example 3
Using a similar method of operation to that described in Example 1, a quantity of 132 kg per hr. of a 41% by wt. lithium hydroxide suspension and a quantity of 47 1 per hr. 70% by wt.
hydrogen peroxide solution is fed through the mixer pump for reaction. In this way, a quantity of 1 93 kg per hr. lithium peroxide slurry is formed, with heat evolution.
The preparation according to Example 3 results in a product (52 kg per hr) containing 89% by weight lithium peroxide.
Example 4
In one variation of the process, the calcium peroxide slurry prepared according to Example 1 is fed into a decanter centrifuge-from the mixer pump, where up to about 40% by weight of all the water is removed. From there it is passed to a screw pump which passes the concentrated slurry into a spray drier having a sprayer disc. The slurry is dried in the spray drier the inflow air temperature being approx. 773K and the outflow air temperature being approx. 383K.
The dry, free-flowing product in powder form leaving the dryer contains 75% by weight calcium peroxide, is virtually free from water of crystallisation and can be put directly into bins or packed without milling, after it has cooled.
It should be emphasised that in spite of the use of technical grade calcium hydroxide, products with good stabilities are obtained which can be stored for months under normal storage conditions without any substantial loss of active oxygen.
Claims (20)
1. The invention provides a process for the preparation of an alkali metal or alkaline earth metal peroxide comprising forming a mixture of a concentrated aqueous alkali metal or alkaline earth metal oxide or hydroxide suspension and an aqueous hydrogen peroxide solution, allowing the oxide or hydroxide to react with the hydrogen peroxide to form the corresponding peroxide and spray drying the resulting peroxide suspension.
2. A process as claimed in claim 1 wherein the mixture of the oxide or hydroxide suspension and the hydrogen peroxide solution is maintained with mixing until the reaction between them is complete.
3. A process as claimed in claim 1 or 2 wherein the said mixture is maintained at a temperature of from 200C to 800C.
4. A process as claimed in claim 3 wherein the said mixture is maintained at a temperature of from 30"C to 50"C.
5. A process as claimed in any preceding claim wherein the said mixture is maintained for a period of up to 3 hours.
6. A process as claimed in claim 5 wherein the said mixture is maintained for a period of up to 0.5 hours.
7. A process as claimed in any preceding claim wherein the oxide or hydroxide suspension has a concentration greater than 200 g/l;
8. A process as claimed in claim 7 wherein the oxide or hydroxide suspension has a concentration greater than 300 g/l.
9. A process as claimed in any preceding claim wherein the concentration of the oxide or hydroxide suspension is such that it is just pumpable.
10. A process as claimed in any preceding claim wherein the hydrogen peroxide solution has a concentration greater than 50% by weight.
11. A process as claimed in claim 10 wherein the hydrogen peroxide solution has a concentration greater than 65% by weight.
12. A process as claimed in any preceding claim wherein the quantity of hydrogen peroxide used does not vary from the stoichiometric by more than 10%.
1 3. A process as claimed in claim 12 wherein the quantity of hydrogen peroxide is approximately stoichiometric.
14. A process as claimed in any preceding claim wherein a portiori of the peroxide suspension formed is recycled to the mixing stage.
1 5. A process as claimed in any preceding claim wherein the peroxide suspension formed is reduced to a water content of not more than 40% by weight before being spray dried.
1 6. A process as claimed in any preceding claim wherein the spray drying is conducted at an iniet temperature of from 1 500C to 6000C and an outlet temperature of from 600C to 1 200C.
1 7. A process as claimed in any preceding claim wherein the alkali metal or alkaline earth metal oxide or hydroxide is lithium or magnesium or calcium oxide or hydroxide.
18. A process as claimed in claim 1 and substantially as described herein with reference to any one of Examples 1 to 3.
19. A process as claimed in claim 1 and substantially as described herein with reference to
Example 4.
20. An alkali metal or alkaline earth metal peroxide whenever prepared by a process as claimed in any preceding claim.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19792918137 DE2918137A1 (en) | 1979-05-05 | 1979-05-05 | METHOD FOR PRODUCING ALKALINE OR ALKALINE EARTH PEROXIDES |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2048842A true GB2048842A (en) | 1980-12-17 |
| GB2048842B GB2048842B (en) | 1983-02-23 |
Family
ID=6069996
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8014089A Expired GB2048842B (en) | 1979-05-05 | 1980-04-29 | Process for the preparation of inorganic peroxides |
Country Status (13)
| Country | Link |
|---|---|
| JP (1) | JPS55149107A (en) |
| AT (1) | AT382139B (en) |
| AU (1) | AU541584B2 (en) |
| BE (1) | BE883079A (en) |
| BR (1) | BR8002696A (en) |
| CA (1) | CA1167235A (en) |
| DE (1) | DE2918137A1 (en) |
| ES (1) | ES489620A1 (en) |
| FR (1) | FR2456069B1 (en) |
| GB (1) | GB2048842B (en) |
| IT (1) | IT1140860B (en) |
| LU (1) | LU82328A1 (en) |
| NL (1) | NL189083C (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0040318A1 (en) * | 1980-05-15 | 1981-11-25 | Interox Chemicals Limited | The production of alkali metal or alkaline earth metal peroxides and peroxides when so produced |
| EP0058360A1 (en) * | 1981-02-16 | 1982-08-25 | Peroxid-Chemie GmbH | Process for the continuous preparation of alkali hyperoxide |
| EP0574667A1 (en) * | 1992-06-13 | 1993-12-22 | Hüls Aktiengesellschaft | Process for the preparation of 2,2,6,6-tetramethylpiperidin-N-oxyls, and their 4-substituted derivatives |
| EP0846655A1 (en) * | 1996-12-06 | 1998-06-10 | Solvay Interox GmbH | Alkaline earth metal peroxide product |
| US6547490B2 (en) | 2000-07-18 | 2003-04-15 | Solvay Interox Gmbh | Coated metal peroxides |
| US7488439B2 (en) | 2002-10-18 | 2009-02-10 | Solvay Chemicals Gmbh | Method for producing dust-free alkaline earth peroxides |
| US20100239618A1 (en) * | 2006-02-28 | 2010-09-23 | Swissdent Cosmetics Ag | Toothpaste |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3025682A1 (en) * | 1980-07-07 | 1982-02-11 | Peroxid-Chemie GmbH, 8023 Höllriegelskreuth | METHOD FOR PRODUCING PEROXIDES OF TWO-VALUE METALS |
| JPS5773607A (en) * | 1980-10-24 | 1982-05-08 | Dainippon Printing Co Ltd | Calibration system of lithographic-plate pattern area rate meter |
| JPH02120478U (en) * | 1989-03-17 | 1990-09-28 | ||
| US5394867A (en) * | 1991-06-05 | 1995-03-07 | Brookdale International Systems Inc. | Personal disposable emergency breathing system with dual air supply |
| US5186165A (en) * | 1991-06-05 | 1993-02-16 | Brookdale International Systems Inc. | Filtering canister with deployable hood and mouthpiece |
| CN114634165B (en) * | 2022-01-20 | 2023-08-29 | 常熟理工学院 | Method for preparing calcium peroxide by utilizing waste incineration fly ash |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2415443A (en) * | 1944-11-28 | 1947-02-11 | Albert Pavlik | Strontium peroxide and method of making the same |
| US2695217A (en) * | 1952-05-22 | 1954-11-23 | Shell Dev | Purification of hydrogen peroxide |
| US3120997A (en) * | 1961-08-25 | 1964-02-11 | Gen Dynamics Corp | Process for producing alkali metal superoxides |
| US3134646A (en) * | 1962-01-15 | 1964-05-26 | Lithium Corp | Preparation of lithium peroxide |
| US3446588A (en) * | 1967-03-02 | 1969-05-27 | Foote Mineral Co | Method for preparing lithium peroxide |
| JPS5039078B1 (en) * | 1971-02-22 | 1975-12-13 | ||
| FR2175652B1 (en) * | 1972-03-17 | 1974-08-02 | Air Liquide | |
| US3907506A (en) * | 1972-03-17 | 1975-09-23 | Air Liquide | Apparatus for the preparation of alkaline hyperoxide |
| JPS5146520B2 (en) * | 1972-11-10 | 1976-12-09 |
-
1979
- 1979-05-05 DE DE19792918137 patent/DE2918137A1/en active Granted
-
1980
- 1980-03-03 NL NLAANVRAGE8001274,A patent/NL189083C/en not_active IP Right Cessation
- 1980-03-17 ES ES489620A patent/ES489620A1/en not_active Expired
- 1980-04-03 LU LU82328A patent/LU82328A1/en unknown
- 1980-04-15 IT IT21372/80A patent/IT1140860B/en active
- 1980-04-17 AU AU57553/80A patent/AU541584B2/en not_active Expired - Fee Related
- 1980-04-29 GB GB8014089A patent/GB2048842B/en not_active Expired
- 1980-04-30 BR BR8002696A patent/BR8002696A/en not_active IP Right Cessation
- 1980-05-02 BE BE1/9804A patent/BE883079A/en not_active IP Right Cessation
- 1980-05-05 FR FR8010024A patent/FR2456069B1/en not_active Expired
- 1980-05-05 AT AT0238280A patent/AT382139B/en not_active IP Right Cessation
- 1980-05-05 CA CA000351249A patent/CA1167235A/en not_active Expired
- 1980-05-06 JP JP5876380A patent/JPS55149107A/en active Granted
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0040318A1 (en) * | 1980-05-15 | 1981-11-25 | Interox Chemicals Limited | The production of alkali metal or alkaline earth metal peroxides and peroxides when so produced |
| EP0058360A1 (en) * | 1981-02-16 | 1982-08-25 | Peroxid-Chemie GmbH | Process for the continuous preparation of alkali hyperoxide |
| US4397833A (en) * | 1981-02-16 | 1983-08-09 | Peroxid-Chemie Gmbh | Process for the continuous production of alkali metal superoxides |
| EP0574667A1 (en) * | 1992-06-13 | 1993-12-22 | Hüls Aktiengesellschaft | Process for the preparation of 2,2,6,6-tetramethylpiperidin-N-oxyls, and their 4-substituted derivatives |
| US5416215A (en) * | 1992-06-13 | 1995-05-16 | Huels Aktiengesellschaft | Process to preparing 2,2,6,6-tetra-methylpiperidine-n-oxyl and its 4-position substituted derivatives |
| EP0846655A1 (en) * | 1996-12-06 | 1998-06-10 | Solvay Interox GmbH | Alkaline earth metal peroxide product |
| US6547490B2 (en) | 2000-07-18 | 2003-04-15 | Solvay Interox Gmbh | Coated metal peroxides |
| US7488439B2 (en) | 2002-10-18 | 2009-02-10 | Solvay Chemicals Gmbh | Method for producing dust-free alkaline earth peroxides |
| US20100239618A1 (en) * | 2006-02-28 | 2010-09-23 | Swissdent Cosmetics Ag | Toothpaste |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2918137C2 (en) | 1988-06-09 |
| GB2048842B (en) | 1983-02-23 |
| IT1140860B (en) | 1986-10-10 |
| ES489620A1 (en) | 1980-09-16 |
| NL189083C (en) | 1993-01-04 |
| CA1167235A (en) | 1984-05-15 |
| FR2456069A1 (en) | 1980-12-05 |
| NL8001274A (en) | 1980-11-07 |
| ATA238280A (en) | 1986-06-15 |
| AU541584B2 (en) | 1985-01-10 |
| AU5755380A (en) | 1980-11-13 |
| IT8021372A0 (en) | 1980-04-15 |
| AT382139B (en) | 1987-01-12 |
| BR8002696A (en) | 1980-12-16 |
| BE883079A (en) | 1980-11-03 |
| NL189083B (en) | 1992-08-03 |
| FR2456069B1 (en) | 1985-10-11 |
| LU82328A1 (en) | 1980-07-02 |
| DE2918137A1 (en) | 1980-11-20 |
| JPS55149107A (en) | 1980-11-20 |
| JPS6356166B2 (en) | 1988-11-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19980429 |