CAS No.: 56047-23-5
Molecular Formula: C8H6ClNaO4
Molecular Weight: 224.57
EINECS No.: 259-963-2 

Sodium 4-chlorophthalate (CAS 56047-23-5) is an important fine chemical intermediate, and its main uses are as follows: 

Chemical intermediate
Synthetic chlorinated phthalic anhydride
As a key raw material, it is used in the production of chlorinated phthalic anhydride, which has important applications in the synthesis of high-temperature resistant materials such as polyimide. 

High-efficiency passivators and preservatives.
In the synthetic and dye industries, it can be used as an intermediate for pigments, dyes, and organic synthesis. It is used in the preparation of phthalocyanine blue (an organic pigment), which is widely applied in ink, coating, and plastic coloring fields.
It can also be used as an additive for coatings, plastics, rubber, and fibers.