GB831025A - Removal of water from aqueous ethylene diamine - Google Patents
Removal of water from aqueous ethylene diamineInfo
- Publication number
- GB831025A GB831025A GB37009/57A GB3700957A GB831025A GB 831025 A GB831025 A GB 831025A GB 37009/57 A GB37009/57 A GB 37009/57A GB 3700957 A GB3700957 A GB 3700957A GB 831025 A GB831025 A GB 831025A
- Authority
- GB
- United Kingdom
- Prior art keywords
- ethylene diamine
- pressure
- water
- residue
- distillation
- 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
- C07C209/00—Preparation of compounds containing amino groups bound to a carbon skeleton
- C07C209/82—Purification; Separation; Stabilisation; Use of additives
- C07C209/84—Purification
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C209/00—Preparation of compounds containing amino groups bound to a carbon skeleton
- C07C209/82—Purification; Separation; Stabilisation; Use of additives
- C07C209/86—Separation
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Water is removed from aqueous ethylene diamine by subjecting it to at least one fractional distillation including a distillation at superatmospheric pressure to obtain a vapour richer in water and a liquid richer in ethylene diamine than the feed, there being employed alternate distillations, the residue from each being subjected to the other, the lower pressure being not more than 3/4 that of the higher and preferably not more than 15 p.s.i.g. When using a single distillation at superatmospheric pressure the pressure is preferably at least 1.5 atmospheres (absolute). If the aqueous ethylene diamine contains at least 7% by weight of water, distillation of at least 2600 mm. of mercury (absolute) will give a residue containing at least 95% of ethylene diamine. At pressures of at least 55 p.s.i.g. no azeotrope is formed and water may be separated directly leaving dry ethylene diamine. When using alternate high and low pressure distillations the first (high pressure) should yield overhead a fraction rich in water and as bottoms a fraction containing more ethylene diamine than the azeotrope formed at the lower pressure. This residue is distilled at the lower pressure to yield ethylene diamine overhead and the azeotrope as residue which is recycled to the first column to be redistilled at the higher pressure. The lower pressure is preferably sub-atmospheric.ALSO:Water is removed from aqueous ethylene diamine by subjecting it to at least one fractional distillation including a distillation at super-atmospheric pressure to obtain a vapour richer in water and a liquid richer in ethylene diamine than the feed, there being employed alternate distillations, the residue from each being subjected to the other, the lower pressure being not more than 3/4 that of the higher and preferably not more than 15 p.s.i.g. When using a single distillation at superatmospheric pressure the pressure is preferably at least 1.5 atmospheres (absolute). If the aqueous ethylene diamine contains at least 7% by weight of water, distillation at at least 2600 mm. of mercury (absolute) will give a residue containing at least 95% of ethylene diamine. At pressures of at least 55 p.s.i.g. no azeotrope is formed and water may be separated directly leaving dry ethylene diamine. When using alternate high and low pressure distillations the first (high pressure) should yield overhead a fraction rich in water and as bottoms a fraction containing more ethylene diamine than the azeotrope formed at the lower pressure. This residue is distilled at the lower pressure to yield ethylene diamine overhead and the azeotrope as residue which is recycled to the first column to be redistilled at the higher pressure. The lower pressure is preferably sub-atmospheric.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB37009/57A GB831025A (en) | 1957-11-27 | 1957-11-27 | Removal of water from aqueous ethylene diamine |
| DED51995A DE1263776B (en) | 1957-11-27 | 1957-12-17 | Process for the production of practically anhydrous ethylene diamine from aqueous ethylene diamine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB37009/57A GB831025A (en) | 1957-11-27 | 1957-11-27 | Removal of water from aqueous ethylene diamine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB831025A true GB831025A (en) | 1960-03-23 |
Family
ID=10392979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB37009/57A Expired GB831025A (en) | 1957-11-27 | 1957-11-27 | Removal of water from aqueous ethylene diamine |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB831025A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3394186A (en) * | 1964-10-06 | 1968-07-23 | Jefferson Chem Co Inc | Manufacture of anhydrous ethylenediamine |
-
1957
- 1957-11-27 GB GB37009/57A patent/GB831025A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3394186A (en) * | 1964-10-06 | 1968-07-23 | Jefferson Chem Co Inc | Manufacture of anhydrous ethylenediamine |
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