GB736386A - Process for recovering iodine from iodine-containing aqueous glycol solutions - Google Patents
Process for recovering iodine from iodine-containing aqueous glycol solutionsInfo
- Publication number
- GB736386A GB736386A GB25278/53A GB2527853A GB736386A GB 736386 A GB736386 A GB 736386A GB 25278/53 A GB25278/53 A GB 25278/53A GB 2527853 A GB2527853 A GB 2527853A GB 736386 A GB736386 A GB 736386A
- Authority
- GB
- United Kingdom
- Prior art keywords
- iodine
- reaction mixture
- oxygen
- oxidizing agent
- oxidizing
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C31/00—Saturated compounds having hydroxy or O-metal groups bound to acyclic carbon atoms
- C07C31/18—Polyhydroxylic acyclic alcohols
- C07C31/20—Dihydroxylic alcohols
- C07C31/202—Ethylene glycol
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
- C07C29/48—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by oxidation reactions with formation of hydroxy groups
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
In the production of glycol by oxidizing ethylene in aqueous phase using iodine as oxygen-transmitting agent, iodine is recovered from the reaction mixture obtained, by treating with an oxidizing agent having a negative redox potential greater than that corresponding to the reaction 2I-=I2+2e-, where E0=-0.535, whereby iodine, present as elemental iodine, hydrogen iodide, or bound in complex compounds, is precipitated. Oxidizing agents may be chlorine, nitrogen oxides which may be admixed with oxygen, potassium permanganate, hydrogen peroxide, ferric chloride, hypochlorous acid, sodium hypochlorite, or chromium trioxide, or may be liberated by acid reaction, e.g. on sodium nitrite with or without oxygen addition. The reaction mixture may be stirred during oxidizing agent addition. After filtering off the precipitated iodine, iodine remaining in the reaction mixture as glycol iodohydrin or ethylene di-iodide may be recovered by hydrolysing to hydrogen iodide, e.g. by making alkaline with NaOH and heating on a water bath, say at 70-80 DEG C., for 2-3 hours, and then adding more oxidizing agent after acidifying with dilute sulphuric acid.ALSO:In the production of glycol by oxidizing ethylene in aqueous phase using iodine as oxygen-transmitting agent, iodine is recovered from the reaction mixture obtained, by treating with an oxidizing agent having a negative redox potential greater than that corresponding to the reaction 21- = I2 + 2e-, where E0 = -0.535, whereby iodine, present as elemental iodine, hydrogen iodide, or bound in complex compounds, is precipitated. Oxidizing agents may be chlorine, nitrogen oxides which may be admixed with oxygen, potassium permanganate, hydrogen peroxide, ferric chloride, hypochlorous acid, sodium hypochlorite, or chromium trioxide, or may be liberated by acid reaction, e.g. on sodium nitrite with or without oxygen addition. The reaction mixture may be stirred during oxidizing agent addition. After filtering off the precipitated iodine, iodine remaining in the reaction mixture as glycol iodohydrin or ethylene di-iodide may be recovered by hydrolysing to hydrogen iodide, e.g. by making alkaline with NaOH and heating on a water bath, say at 70-80 DEG C., for 2-3 hours and then adding more oxidizing agent after acidifying with dilute sulphuric acid.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE736386X | 1952-09-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB736386A true GB736386A (en) | 1955-09-07 |
Family
ID=20319700
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB25278/53A Expired GB736386A (en) | 1952-09-15 | 1953-09-14 | Process for recovering iodine from iodine-containing aqueous glycol solutions |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB736386A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107235474A (en) * | 2017-07-28 | 2017-10-10 | 贵州开磷碘业有限责任公司 | The method and its device of a kind of thick iodine purification |
-
1953
- 1953-09-14 GB GB25278/53A patent/GB736386A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107235474A (en) * | 2017-07-28 | 2017-10-10 | 贵州开磷碘业有限责任公司 | The method and its device of a kind of thick iodine purification |
| CN107235474B (en) * | 2017-07-28 | 2023-07-21 | 贵州开磷碘业有限责任公司 | Method and device for purifying crude iodine |
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