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
Application number
GB20376/48A
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Acordis UK Ltd
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British Celanese Ltd
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Application filed by British Celanese LtdfiledCriticalBritish Celanese Ltd
Publication of GB643700ApublicationCriticalpatent/GB643700A/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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Catalysts
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Organic Low-Molecular-Weight Compounds And Preparation Thereof
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Abstract
Acetic anhydride is purified by distilling in presence of sodium nitrite, the anhydride having been produced by thermal dehydration of acetic acid in presence of an ammonium phosphate catalyst. The amount of nitrite is preferably 0.1-0.5 per cent by weight of the weight of anhydride.
GB20376/48A1947-08-131948-07-30Purification of acetic anhydride
ExpiredGB643700A
(en)
A procedure for the obtaining of 4-monoalquilaminosalicºlicos acids and 4-monoalquiloxialquilaminosalicºlicos acids (Machine-translation by Google Translate, not legally binding)