Formic arid

The lower fraction which distils up to the point where the thermometer registers 195° contains a considerable amount of formic arid and in large scale production it would undoubtedly pay to recover it. 

AMIDES Formic arid. Mercuric nitrate. Tetrachlorosilane. 

Anhydrous acetic arid not containing formic arid is collected at the base of the dehydrator. This stream is then rid of the heavy compounds (propionic arid) and concentrated to 99.8 per cent weight by distillation (about 30 trays). Corrosion is limited by building some parts of the installation of copper, titanium or zirconium. 

Generally epoxide hydrations cited here will be of two types. The first involves heating the epoxide with water alone at 100-125°. frequently in a sealed tube The second, treating it with water at moderate temperaturew in the presence of a trace of acid. Meet commonly employed for this purpose is sulfuric acid although perchloric acid has likewise keen reported oil occasion Acetic acid, formic acid, hydrochloric add, hydrobromjc acid, and hydroiodio arid can be used... 

The acyl compounds (2g) are heated with a mixture of 98% formic acid (12 ml) and 30% hydrogen peroxide (6 ml) at 100°C (10-15 min). The solution changes colour to yellow or brown during this period. Dilution with water arid neutralization with concentrated ammonia solution precipitates the benzimidazole (68). Extraction of the filtrate with chloroform can increase the yield. 

Johnson. J.F. Cole. R.H. Dielectric polarization of liquid arid solid formic acid. J. Am. Chem. Soc. 1951. 73, 4536. 

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