GB944232A - Recovery of phthalic anhydride - Google Patents
Recovery of phthalic anhydrideInfo
- Publication number
- GB944232A GB944232A GB213659A GB213659A GB944232A GB 944232 A GB944232 A GB 944232A GB 213659 A GB213659 A GB 213659A GB 213659 A GB213659 A GB 213659A GB 944232 A GB944232 A GB 944232A
- Authority
- GB
- United Kingdom
- Prior art keywords
- phthalic anhydride
- gases
- water
- cyclone separator
- amount
- 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)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
Phthalic anhydride in solid form is recovered from hot gases containing phthalic anhydride vapour by introducing water droplets into the hot gases in a cyclone separator by the injection of water through a spray nozzle in the inlet of the cyclone separator, cooling the gases directly by the evaporation of water droplets thus precipitating phthalic anhydride direct which is separated from the cooled gases by the cyclone separator. To minimise the amount of water required the hot reaction gases from the phthalic anhydride manufacturing unit may be precooled by indirect contact to not below 135 DEG C., if subsequently the amount of water injected does not largely exceed the amount needed to effect condensation then saturation will be avoided and hydrolysis will not follow to any substantial extent. The coprecipitation of maleic anhydride may be avoided if the temperature of the cooled gas is kept above 80 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB213659A GB944232A (en) | 1959-01-20 | 1959-01-20 | Recovery of phthalic anhydride |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB213659A GB944232A (en) | 1959-01-20 | 1959-01-20 | Recovery of phthalic anhydride |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB944232A true GB944232A (en) | 1963-12-11 |
Family
ID=9734224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB213659A Expired GB944232A (en) | 1959-01-20 | 1959-01-20 | Recovery of phthalic anhydride |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB944232A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0206010A2 (en) * | 1985-06-19 | 1986-12-30 | BASF Corporation | Phthalic anhydride process and product |
-
1959
- 1959-01-20 GB GB213659A patent/GB944232A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0206010A2 (en) * | 1985-06-19 | 1986-12-30 | BASF Corporation | Phthalic anhydride process and product |
| EP0206010A3 (en) * | 1985-06-19 | 1988-01-13 | Basf Corporation | Phthalic anhydride process and product |
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