Phthalic Anhydride

We offer phthalic anhydride,
product details:
cas no. 85-44-9
other names phthlandion phthalicacidanhydride phthlandion
mf c8h4o3
einecs no. 201-607-5
place of origin u.s.a
purity 99.8%
appearance white flakes solid
application coating auxiliary agents
phthalic acid (wt%): 0.10 max
color stability at heating: 50 (90 min at 250?)
molecular weight: 148.11
solubility in benzene: 100
maleic anhydride (wt%): 0.05 max
solidification point: 130.8 min
minimum order quantity:10 ton/tons
port:u.s.a
packaging details:1.inside plastic film, outside polywoven bag (all comply with customer's requests) 2.size for 1000kg (nw: 25kg/bag * 40bags) l*w*h 51' * 44' * 40' (129cm *112cm * 100cm) 3.20'fcl/16ton with pallet, 20'fcl/20 ton without pallet 40'fcl/24ton with pallet, 40'fcl/32 ton without pallet (need add $15 per ton if with pallet)
delivery time: within 7 - 10 days after advance payment
payment terms: l/c,t/t,western union
supply ability: 10000 ton/tons per month
detailed product description
phthalic anhydride 99.8%
phthalic anhydride is the organic compound with the formula c8h4o3. This anhydride of phthalic acid, a colourless solid, is an important industrial chemical, especially for the large-scale production of plasticizers for plastics. In 2002, approximately 4.6 billion kilograms were produced
applications in industry and organic synthesis
phthalic anhydride is a versatile intermediate in organic chemistry, in part because it is bifunctional and cheaply available. It undergoes hydrolysis and alcoholysis. Hydrolysis by hot water forms ortho-phthalic acid. This process is reversible: phthalic anhydride re-forms upon heating the acid above 180 °c.
hydrolysis of anhydrides is not typically a reversible process. However, phthalic acid is easily dehydrated to form phthalic anhydride due to the creation of a thermodynamically favorable 5-membered ring.
organic synthesis
phthalic anhydride is a precursor to a variety of reagents useful in organic synthesis. Important derivatives include phthalimide and its many derivatives. Chiral alcohols form half-esters (see above), and these derivatives are often resolvable because they form diastereomeric salts with chiral amines such as brucine. A related ring-opening reaction involves peroxides to give the useful peroxy acid:
c6h4(co)2o + h2o2 ? c6h4(co3h)co2h
1.good quanlity and sgs ,ciq,bv test
2.the manufacture of plasticizers, alkyd resins
3.unsaturated polyester resin
precursor to dyestuffs
phthalic anhydride is widely used in industry for the production of certain dyes. A well-known application of this reactivity is the preparation of the anthroquinone dye quinizarin by reaction with para-chlorophenol followed by hydrolysis of the chloride.
item index
top grade first grade qualified product
appearance white scaly or crystalline powder white scaly or crystalline powder with slight colors
molten chroma(chroma no. )= 20 50 100
thermostable chroma(chroma no. )= 50 150 -
chroma of vitriol(chroma no. )= 60 100 150
crystallization point°c= 130.5 130.3 130.0
purity(mass fraction)%= 99.50 99.50 99.00
free acid(mass fraction)= % 0.20 0.30 0.50
ash(mass fraction)%= 0.05 - -