ES289252A1 - Procedure for the recovery of maleic anhydride. (Machine-translation by Google Translate, not legally binding) - Google Patents
Procedure for the recovery of maleic anhydride. (Machine-translation by Google Translate, not legally binding)Info
- Publication number
- ES289252A1 ES289252A1 ES0289252A ES289252A ES289252A1 ES 289252 A1 ES289252 A1 ES 289252A1 ES 0289252 A ES0289252 A ES 0289252A ES 289252 A ES289252 A ES 289252A ES 289252 A1 ES289252 A1 ES 289252A1
- Authority
- ES
- Spain
- Prior art keywords
- maleic anhydride
- anhydride
- phthalic
- equivalent
- practically
- 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
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/54—Preparation of carboxylic acid anhydrides
- C07C51/573—Separation; Purification; Stabilisation; Use of additives
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Furan Compounds (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
"Process for the recovery of maleic anhydride", type specification, characterized by starting from the aqueous washing liquid obtained by washing the effluent gas from an oxidation reaction mixture of phthalic anhydride, after separating by condensation at least 98% of the anhydride phthalic of the mixture, and because it comprises treating the said aqueous mixture containing maleic anhydride, in a concentration equivalent to about 20% maleic anhydride, and practically free of solid phthalic material, with crude maleic anhydride, until the acid concentration maleic is elevated to 35% maleic anhydride equivalent; dehydrating the resulting mixture to obtain crude maleic anhydride; treating it, practically at boiling temperature, with a strong acidic agent in a proportion of the order of 0.2 to 3 parts approximately calculated as 100% sulfuric acid, per 100 parts of crude maleic anhydride, practically equivalent to one molecule of H2SO4 per aldehyde molecule present, for a period of the order of 1 to 12 hours, and then fractioning it and recovering the maleic anhydride type specification. (Machine-translation by Google Translate, not legally binding)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US20427762A | 1962-06-21 | 1962-06-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ES289252A1 true ES289252A1 (en) | 1965-01-01 |
Family
ID=22757304
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES0289252A Expired ES289252A1 (en) | 1962-06-21 | 1963-06-21 | Procedure for the recovery of maleic anhydride. (Machine-translation by Google Translate, not legally binding) |
Country Status (4)
| Country | Link |
|---|---|
| BE (1) | BE633740A (en) |
| DE (1) | DE1468002A1 (en) |
| ES (1) | ES289252A1 (en) |
| GB (1) | GB1042255A (en) |
-
1963
- 1963-06-18 BE BE633740A patent/BE633740A/en unknown
- 1963-06-21 GB GB2478563A patent/GB1042255A/en not_active Expired
- 1963-06-21 DE DE19631468002 patent/DE1468002A1/en active Pending
- 1963-06-21 ES ES0289252A patent/ES289252A1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB1042255A (en) | 1966-09-14 |
| BE633740A (en) | 1963-12-18 |
| DE1468002A1 (en) | 1969-01-09 |
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