GB371059A - Process for the manufacture of dichromates - Google Patents
Process for the manufacture of dichromatesInfo
- Publication number
- GB371059A GB371059A GB2342/31A GB234231A GB371059A GB 371059 A GB371059 A GB 371059A GB 2342/31 A GB2342/31 A GB 2342/31A GB 234231 A GB234231 A GB 234231A GB 371059 A GB371059 A GB 371059A
- Authority
- GB
- United Kingdom
- Prior art keywords
- chromate
- under pressure
- carbon dioxide
- chromium
- lime
- 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
Links
- 238000004519 manufacturing process Methods 0.000 title 1
- 238000000034 method Methods 0.000 title 1
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract 8
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical class [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 abstract 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 abstract 5
- 235000008733 Citrus aurantifolia Nutrition 0.000 abstract 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 abstract 4
- 235000011941 Tilia x europaea Nutrition 0.000 abstract 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract 4
- 239000001569 carbon dioxide Substances 0.000 abstract 4
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract 4
- 239000004571 lime Substances 0.000 abstract 4
- 239000001301 oxygen Substances 0.000 abstract 4
- 229910052760 oxygen Inorganic materials 0.000 abstract 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract 3
- 239000003513 alkali Substances 0.000 abstract 3
- 229910052804 chromium Inorganic materials 0.000 abstract 3
- 239000011651 chromium Substances 0.000 abstract 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 abstract 2
- 229910000604 Ferrochrome Inorganic materials 0.000 abstract 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 abstract 2
- 239000007789 gas Substances 0.000 abstract 2
- 239000001257 hydrogen Substances 0.000 abstract 2
- 229910052739 hydrogen Inorganic materials 0.000 abstract 2
- 239000000203 mixture Substances 0.000 abstract 2
- 230000003647 oxidation Effects 0.000 abstract 2
- 238000007254 oxidation reaction Methods 0.000 abstract 2
- 235000011121 sodium hydroxide Nutrition 0.000 abstract 2
- JHWIEAWILPSRMU-UHFFFAOYSA-N 2-methyl-3-pyrimidin-4-ylpropanoic acid Chemical compound OC(=O)C(C)CC1=CC=NC=N1 JHWIEAWILPSRMU-UHFFFAOYSA-N 0.000 abstract 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 abstract 1
- 229910045601 alloy Inorganic materials 0.000 abstract 1
- 239000000956 alloy Substances 0.000 abstract 1
- 239000008346 aqueous phase Substances 0.000 abstract 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 abstract 1
- 239000000920 calcium hydroxide Substances 0.000 abstract 1
- 235000011116 calcium hydroxide Nutrition 0.000 abstract 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 abstract 1
- BCFSVSISUGYRMF-UHFFFAOYSA-N calcium;dioxido(dioxo)chromium;dihydrate Chemical compound O.O.[Ca+2].[O-][Cr]([O-])(=O)=O BCFSVSISUGYRMF-UHFFFAOYSA-N 0.000 abstract 1
- 229910052799 carbon Inorganic materials 0.000 abstract 1
- 229910000423 chromium oxide Inorganic materials 0.000 abstract 1
- VQWFNAGFNGABOH-UHFFFAOYSA-K chromium(iii) hydroxide Chemical compound [OH-].[OH-].[OH-].[Cr+3] VQWFNAGFNGABOH-UHFFFAOYSA-K 0.000 abstract 1
- SOCTUWSJJQCPFX-UHFFFAOYSA-N dichromate(2-) Chemical compound [O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O SOCTUWSJJQCPFX-UHFFFAOYSA-N 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 abstract 1
- 238000002386 leaching Methods 0.000 abstract 1
- 230000001590 oxidative effect Effects 0.000 abstract 1
- 229910000029 sodium carbonate Inorganic materials 0.000 abstract 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G37/00—Compounds of chromium
- C01G37/14—Chromates; Bichromates
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
Alkali dichromates are obtained by treating alkali chromates in the aqueous phase and in the presence of the requisite quantity of chromium oxide or hydroxide or of metallic chromium or its alloys with oxygen or gases containing it under pressure at temperatures above 100 DEG C., say at 250-300 DEG C. In one example a chromium ore is treated with fused caustic soda in the presence of iron oxide or roost residue at 450-500 DEG C. to obtain chromate. A part of the product is reduced by hydrogen under pressure in the presence of water at 300 DEG C. and the chromium hydroxide recovered mixed with further chromate and treated in the presence of water at 280-300 DEG C. with air or oxygen under pressure to obtain a solution of sodium dichromate. In another example, crude chromate formed by oxidizing roasting at 900-950 DEG C. of a mixture of chromium ore, sodium carbonate, slaked lime, and iron oxide, is treated with oxygen under pressure at 280-300 DEG C. after addition of ferrochrome and water. Carbon dioxide obtained from the carbon in the ferrochrome is bound by the lime present; alternatively by using a current of air instead of oxygen the carbon dioxide may be removed in the issuing gases, but in such case the lime present is preferably converted to carbonate after the oxidation is complete in order to decompose any calcium chromate. In a third example crude chromate containing lime is reduced to chromite at 400-600 DEG C. by hydrogen with or without carbon dioxide. After leaching out alkali the residue is added to crude chromate lye and the mixture oxidized to dichromate as before described. Carbon dioxide is introduced before or after oxidation to convert lime present to carbonate. Reference has been directed by the Comptroller to Specification 364,361.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR371059X | 1930-08-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB371059A true GB371059A (en) | 1932-04-21 |
Family
ID=8894662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2342/31A Expired GB371059A (en) | 1930-08-14 | 1931-01-23 | Process for the manufacture of dichromates |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB371059A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE967193C (en) * | 1953-06-07 | 1957-10-24 | Bayer Ag | Process for the production of alkali chromate which is practically free of alkali aluminate and alkali silicate |
| US5279804A (en) * | 1991-04-26 | 1994-01-18 | Occidental Chemical Corporation | Vanadium removal in aqueous streams |
-
1931
- 1931-01-23 GB GB2342/31A patent/GB371059A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE967193C (en) * | 1953-06-07 | 1957-10-24 | Bayer Ag | Process for the production of alkali chromate which is practically free of alkali aluminate and alkali silicate |
| US5279804A (en) * | 1991-04-26 | 1994-01-18 | Occidental Chemical Corporation | Vanadium removal in aqueous streams |
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