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Expired
Application number
GB23334/58A
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Stamicarbon BV
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Stamicarbon BV
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Publication of GB824639ApublicationCriticalpatent/GB824639A/en
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
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Chemical & Material Sciences
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Organic Chemistry
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Engineering & Computer Science
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Oil, Petroleum & Natural Gas
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Organic Low-Molecular-Weight Compounds And Preparation Thereof
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Abstract
Maleic anhydride is purified by boiling with paraldehyde followed by distillation. Amounts of paraldehyde of less than 3% by weight of the maleic anhydride are sufficient. Temperatures of 100-125 DEG C. at 30-50 mm. Hg are mentioned. Similar pressures may be used for the distillation step.
GB23334/58A1957-07-241958-07-21Process of purifying maleic anhydride
ExpiredGB824639A
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