Synthesis and Physicochemical Characterization of Chitin Derivatives

Table 2

Some important properties of phthalic anhydride and trimellitic anhydride.

	Phthalic anhydride	Trimellitic anhydride
Molecular formula	C8H4O3	C9H4O5
Formula weight (g mol^−1)	148.1	192.13
Melting point (°C)	131	164–169
Boiling point (°C)	295	390
Density (g mL^−1)	1.53	1.54
Appearance	White flakes	White flakes
Vapor pressure (torr)	5.14×10^−4 at 25°C	7.50×10^−3 at 20°C
Solubility	0.62 g in 100 g water (reacts slowly)	Decomposes in water