Phthalic anhydride
Name synonyms: phthalic anhydride, isobenzofuran-1,3-dione, the anhydride of 1,2-benzylcarbamoyl acid
Product name:phthalic anhydride, isobenzofuran-1,3-dione 1,2-benzenedicarboxylic anhydride
GOST 7119-77
CAS no.: 85-44-9
Chemical formula С8Н4О3

Specification
Name of index Norm according to GOST
1. The appearance of Flakes and powder or melt
2. Mass fraction of phthalic anhydride, %, not less 99,9
3. Crystallization temperature, ° C 130,9
4. Mass fraction of iron, %, not more than 0,0002
5. The content of phthalic acid Lack
6. The color of the molten product, Hazen units, not more:
— with the release during the warranty period:
— for powder and flakes:
— to melt: 15 20

7. The chromaticity of molten product after heating at a temperature of 250ºC for 90 min, Hazen units, not more:
— with the release during the warranty period:
— for powder and flakes:
— to melt:40 60
Not normalized
Application:
• for the production of alkyd resins;
• production of plasticizer (phthalic acid diesters);
• synthesis of dyes and pigments;
• getting tetrachlorophthalic anhydride, polyetherimide resins, polyols;
• as intermediate for a number of pharmaceuticals.
Packing: p/e bags, big bags for flakes, tank with steam jacket for melting.
Storage: in open areas under cover and in private.
Hazard class: 2 class