English
FORMULA: empirical С8Н4О3
Application area: it is intended for the production of plasticizers, alkyd resins, dyes, medical preparations and in the rubber industry.
Properties: phthalic anhydride is produced in grade A from ortho-xylene, top and first grade.
Warranty period of storage – 2 months from the date of manufacture.
TECHNICAL SPECIFICATIONS
| Name of the indicator | Mark A | |
| highest grade | first grade | |
| 1. Appearance | White flakes and powder or melt | White flakes and powder or melt Yellowish or pinkish tint allowed |
| 2. Mass fraction of phthalic anhydride,%, not less | 99,9 | 99,7 |
| 3. Crystallization temperature, ° С, not lower |
130,9 |
130,6 |
| 4. Mass fraction of iron,%, not more than |
0,0002 |
0,003 |
| 5. Phthalic acid content |
Missing |
Not standardized |
| 6. Mass fraction of maleic anhydride,%, not more than |
0,05 |
Not standardized |
| 7. Mass fraction of ash,%, not more than |
0,002 |
Not standardized |
| 8. Chromaticity of the melted product, Hazen units, no more:
Upon release
During the warranty period for powder and flakes
During the warranty period for melt |
15
20
Not standardized |
50
80
Not standardized |
| 9. Chromaticity of the molten product after heating at 250 ° C for 90 minutes, Hazen units, not more than:
Upon release
During the warranty period for powder and flakes
During the warranty period for melt |
40
60
Not standardized |
200
Not standardized
Not standardized |