Phthalic anhydride
| 원료 | X/N | ||||||||||||
| 생산물 | phthalic anhydride | ||||||||||||
| 적용 | To produce phthalic anhydride (PA) from o-xylene, naphthalene or mixtures of both feedstocks using a fixed-bed vapor phase process, originally known as the bon Heyden Process. | ||||||||||||
| 설명 | Description: Air is heated and loaded with evaporated (1) oxylene (X) and/or naphthalene (N). The hydrocarbon/air mixture enters a multitubular reactor (2) containing the catalyst. An agitated salt melt removes the heat of reaction and maintains constant temperature conditions. The reaction heat is used to generate high-pressure steam (S). The reactor effluent containing PA vapors is precooled in a heat exchanger (3) generating steam (S). By further cooling PA is then desublimated in specially designed finned tube switch condensers (4). The crude PA deposited on the condensing surfaces is periodically melted and discharged into a tank (5). The effluent gas is vented to atmosohere after water scrubbing and/or incineration. The crude PA is pretreated thermally (6), from where it is fed to either a batchwise or a continuous vacuum distillation system (7,8). Low and high boiling impurities are removed and the pure PA is obtained as a distillate that can be stored either in the molten state or flaked and bagged. Catalyst: Special high-performance catalyst for o-xylene oxidation as well as universal types for oxidation of naphthalene, o-xylene and mixtures of both feedstocks in any proportions. All catalysts are optionally ball or ring-shaped. Yields: Depending on feedstock quality, 105-110 kg PA per 100 kg o-xylene; 93-98 kg PA per 100 kg naphthalene. |
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| Properties in KDB |
Component Names and Formula
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