GB646219A - Improvements in and relating to the dehydration of aqueous solutions of formic acid - Google Patents
Improvements in and relating to the dehydration of aqueous solutions of formic acidInfo
- Publication number
- GB646219A GB646219A GB35052/47A GB3505247A GB646219A GB 646219 A GB646219 A GB 646219A GB 35052/47 A GB35052/47 A GB 35052/47A GB 3505247 A GB3505247 A GB 3505247A GB 646219 A GB646219 A GB 646219A
- Authority
- GB
- United Kingdom
- Prior art keywords
- column
- pipe
- formic acid
- per cent
- entrainer
- 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
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 title abstract 18
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 title abstract 9
- 235000019253 formic acid Nutrition 0.000 title abstract 9
- 239000007864 aqueous solution Substances 0.000 title 1
- 230000018044 dehydration Effects 0.000 title 1
- 238000006297 dehydration reaction Methods 0.000 title 1
- NMJJFJNHVMGPGM-UHFFFAOYSA-N butyl formate Chemical compound CCCCOC=O NMJJFJNHVMGPGM-UHFFFAOYSA-N 0.000 abstract 8
- 239000002253 acid Substances 0.000 abstract 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 4
- 238000004821 distillation Methods 0.000 abstract 3
- DURPTKYDGMDSBL-UHFFFAOYSA-N 1-butoxybutane Chemical compound CCCCOCCCC DURPTKYDGMDSBL-UHFFFAOYSA-N 0.000 abstract 2
- XNLICIUVMPYHGG-UHFFFAOYSA-N pentan-2-one Chemical compound CCCC(C)=O XNLICIUVMPYHGG-UHFFFAOYSA-N 0.000 abstract 2
- 238000010992 reflux Methods 0.000 abstract 2
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 abstract 1
- XKYICAQFSCFURC-UHFFFAOYSA-N isoamyl formate Chemical class CC(C)CCOC=O XKYICAQFSCFURC-UHFFFAOYSA-N 0.000 abstract 1
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 239000000203 mixture Substances 0.000 abstract 1
- 125000000740 n-pentyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 abstract 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/42—Separation; Purification; Stabilisation; Use of additives
- C07C51/43—Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation
- C07C51/44—Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation by distillation
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/42—Separation; Purification; Stabilisation; Use of additives
- C07C51/43—Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation
- C07C51/44—Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation by distillation
- C07C51/46—Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation by distillation by azeotropic distillation
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Formic acid is dehydrated in a two-stage distillation system, the aqueous feed-acid being supplied at a point in the system where formic acid of the same concentration is present; one stage comprises the concentration of 77 per cent acid (i.e. the C.B.M. of formic acid and water) to 85-95 per cent by rectification in the presence of a water-entrainer, with reflux of entrainer and also part of the water, which separate in the usual decanter, keeping several plates at the base of the column free of entrainer, and the other stage comprises fractionating without an entrainer, the 85-95 per cent acid from the entrainer-distillation stage to give substantially anhydrous formic acid as head-product, and 77 per cent acid as residue; this residue is passed to the entrainer-distillation stage. Suitable entrainers are butyl, isobutyl, amyl and isoamyl formates; also butyl oxide and methylpropyl ketone. In an example 77 per cent formic acid is fed from tank 1 through pipes 2 and 2a into column 3 which is charged with butyl formate. The base of the column is maintained at 103.5 DEG C. The butyl formate/water binary taken off at the head of <PICT:0646219/III/1> the column, is condensed and the condensate is passed to decanter 5. The formate-layer is completely refluxed through pipe 6; and the water-layer is partly withdrawn from the system through pipe 7, and partly returned to the column through pipe 8. Formic acid of about 90 per cent strength and almost free from butyl formate, is withdrawn from the base of column 3 and passed through pipe 11 into column 10. Anhydrous formic acid is withdrawn from column 10 through pipe 12, while the 77 per cent acid which collects at the base, is passed to tank 13 and then pumped to tank 1 through pipe 15. A draw-off pipe 16 is provided on the reflux vessel of column 10 in order to remove any small quantities of butyl formate and water which may have inadvertently passed into column 10. The mixture withdrawn through pipe 16 is returned to column 3 through pipe 17. In another example, the feed is 95 per cent formic acid. This is introduced directly into column 10 through pipes 18 and 18b, and column 3 is charged with butyl oxide. The whole or any part of the process may be carried out at a pressure different from atmospheric. Specification 303,742, [Class 32], is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR646219X | 1941-04-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB646219A true GB646219A (en) | 1950-11-15 |
Family
ID=9001258
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB35052/47A Expired GB646219A (en) | 1941-04-04 | 1947-12-31 | Improvements in and relating to the dehydration of aqueous solutions of formic acid |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB646219A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112386938A (en) * | 2020-12-03 | 2021-02-23 | 山东恒信科技发展有限公司 | Dehydration system and dehydration method for N-formylmorpholine and cyclic interval hydrocarbon |
-
1947
- 1947-12-31 GB GB35052/47A patent/GB646219A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112386938A (en) * | 2020-12-03 | 2021-02-23 | 山东恒信科技发展有限公司 | Dehydration system and dehydration method for N-formylmorpholine and cyclic interval hydrocarbon |
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