Phthalic acid

Description

Phthalic acid · CAS 88-99-3 · C8H6O4. UNII 6O7F7IX66E. Melting Point: 230; Melting Point: Decomposes at 230 °C; Melting Point: 205 - 230 °C.

Identification

CAS Registry Number	88-99-3
PubChem CID	1017
Molecular formula	C8H6O4
IUPAC name	phthalic acid
UNII (FDA)	6O7F7IX66E

Computed Descriptors

Molecular Weight	166.13
XLogP3	0.7
Hydrogen Bond Donor Count	2
Hydrogen Bond Acceptor Count	4
Rotatable Bond Count	2
Exact Mass	166.02660867
Monoisotopic Mass	166.02660867
Topological Polar Surface Area	74.6
Heavy Atom Count	12
Formal Charge	0

Physical & Chemical Properties

Melting Point	230
Melting Point	Decomposes at 230 °C
Melting Point	205 - 230 °C
Melting Point	410-412 °F
Flash Point	334 °F (NTP, 1992)
Flash Point	334 °F (168 °C) (Closed cup)
Flash Point	168 °C c.c.
Flash Point	334 °F
Solubility	7010
Solubility	In water, 6,965 mg/L at 25 °C

Physical description & handling notes

• Phthalic acid appears as white crystals or fine white powder. (NTP, 1992)
• Colorless solid; [Hawley] Colorless or white solid; [CHEMINFO] White crystalline solid; [MSDSonline]
• Solid
• CRYSTALLINE POWDER.
• White crystals or a fine white powder.
• Colorless crystals

Regulatory Status

Regulatory & Food Contact	FDA Cumulative Estimated Daily Intake (CEDI): FCS FDA Inventory of Food Contact Substances Listed in 21 CFR: FCS
GHS notification summary	1.1% (3 / 284)

GHS Hazard Classification

GHS notification summary	1.1% (3 / 284)
Reported hazard statements	H315 (47.5%), H318 (15.8%), H319 (83.1%), H335 (83.5%)

Documented Uses

• Used as an analytical and laboratory reagent and to make medicines, dyes, phenolphthalein, phthalimide, anthranilic acid, and synthetic perfumes; [HSDB]
• ... Medicine ... Organic synthesis. Analytical reagent.
• Dyes, phenolphthalein, phthalimide, anthranilic acid, synthetic perfumes, laboratory reagent.
• Vapor-phase oxidation of naphthalene, catalyzed by vanadium and molybdenum oxides, followed by hydrolysis
• Manufactured by catalytic oxidation of o-toluic acid and oxidation of xylene: Taylor, Dean, US 3064046 (1962 to I.C.I.); Cier, US 3088974 (1963 to Esso Res. & Eng.). Isolation from the fungus, Gibbererella fujikuroi.
• This chemical is listed as a High Production Volume (HPV) (65FR81686). Chemicals listed as HPV were produced in or imported into the U.S. in >1 million pounds in 1990 and/or 1994. The HPV list is based on the 1990 Inventory Update Rule. (IUR) (40 CFR part 710 subpart B; 51FR21438).

Synonyms

phthalic acid; 88-99-3; 1,2-benzenedicarboxylic acid; o-phthalic acid; benzene-1,2-dicarboxylic acid; o-dicarboxybenzene; o-benzenedicarboxylic acid; Acide phtalique; Kyselina ftalova; ortho-phthalic acid; DTXSID8021484; 6O7F7IX66E; NSC-5348; DTXCID901484; CHEBI:29069; hydron;phthalate

Frequently Asked Questions

What are the CAS number and molecular formula of Phthalic acid?

CAS 88-99-3; molecular formula C8H6O4; molecular weight — g/mol.

What other names is Phthalic acid known by?

phthalic acid, 88-99-3, 1,2-benzenedicarboxylic acid, o-phthalic acid, benzene-1,2-dicarboxylic acid, o-dicarboxybenzene.

What is the regulatory status of Phthalic acid?

Documented regulatory listings: FDA Cumulative Estimated Daily Intake (CEDI): FCS; FDA Inventory of Food Contact Substances Listed in 21 CFR: FCS.

Is Phthalic acid classified as hazardous?

1.1% of GHS notifications report no hazard classification (3 of 284).

What are the key physical properties of Phthalic acid?

Melting Point: 230; Melting Point: Decomposes at 230 °C; Melting Point: 205 - 230 °C; Melting Point: 410-412 °F.

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.