GB654469A - Methods of recovering phthalic anhydride - Google Patents
Methods of recovering phthalic anhydrideInfo
- Publication number
- GB654469A GB654469A GB6328/48A GB632848A GB654469A GB 654469 A GB654469 A GB 654469A GB 6328/48 A GB6328/48 A GB 6328/48A GB 632848 A GB632848 A GB 632848A GB 654469 A GB654469 A GB 654469A
- Authority
- GB
- United Kingdom
- Prior art keywords
- phthalic anhydride
- gases
- water
- tower
- vapours
- 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
- C07C63/00—Compounds having carboxyl groups bound to a carbon atoms of six-membered aromatic rings
- C07C63/14—Monocyclic dicarboxylic acids
- C07C63/15—Monocyclic dicarboxylic acids all carboxyl groups bound to carbon atoms of the six-membered aromatic ring
- C07C63/16—1,2 - Benzenedicarboxylic acid
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Phthalic anhydride is removed from gases or vapours containing the same by subjecting the gases or vapours while at an elevated temperature to the action of a water spray or water in the form of fine particles, whereby the phthalic anhydride is condensed and precipitated, the water being supplied in an amount sufficient to condense and precipitate a major proportion of the phthalic anhydride but not in an amount appreciably greater than that required to saturate said vapours or gases. The temperature of the vapours may be above the condensation temperature of phthalic anhydride in the solid phase, or the temperature may be 130 DEG C. or higher and is then reduced to 50 DEG to 95 DEG C. with the water. The gases containing phthalic anhydride may be fed into the upper end of a tower, treated with the water and the precipitated phthalic anhydride removed, e.g. by allowing it to settle at the bottom of the tower and then removing it in a liquid condition by melting. The water employed in the tower may be in the form of particles that are sufficiently small to evaporate before they impinge on any portion of the tower. The phthalic anhydride vapours can be obtained from the vapour phase partial oxidation of polynuclear aromatic compounds, e.g. naphthalene, and the hot reaction gases p are partially cooled to a temperature not lower than 130 DEG C. before being subjected to the water treatment, e.g. by treatment in the tower mentioned above while remaining gases containing unsettled phthalic anhydride may be removed from the tower and the phthalic anhydride separated from said gases.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US654469XA | 1944-12-18 | 1944-12-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB654469A true GB654469A (en) | 1951-06-20 |
Family
ID=22062772
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB6328/48A Expired GB654469A (en) | 1944-12-18 | 1948-02-29 | Methods of recovering phthalic anhydride |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB654469A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4568427A (en) * | 1982-02-27 | 1986-02-04 | Basf Aktiengesellschaft | Continuous isolation of phthalic anhydride and maleic anhydride from reaction gases |
-
1948
- 1948-02-29 GB GB6328/48A patent/GB654469A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4568427A (en) * | 1982-02-27 | 1986-02-04 | Basf Aktiengesellschaft | Continuous isolation of phthalic anhydride and maleic anhydride from reaction gases |
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