TEREPHTHALOYL CHLORIDE (1,4-BENZENEDICARBONYL CHLORIDE)

TEREPHTHALOYL CHLORIDE
PRODUCT IDENTIFICATION
CAS NO.	100-20-9
EINECS NO.	202-829-5
FORMULA	C₆H₄(COCl)₂
MOL WT.	203.02
H.S. CODE
SMILES
TOXICITY	`Oral rat LD50; 2500 mg/kg`
SYNONYMS	`TCl; 1,4-Benzenedicarbonyl Chloride;`
`P-Phthaloyl Chloride;`p-Phenylenedicarbonyl dichloride; p-Phthaloyl chloride; p-Phthaloyl dichloride; Terephthalic acid chloride; Terephthalic acid dichloride; Terephthalic chloride; Terephthaloyl Dichloride; Terephthaloyl dichloride; p-Phthalyl dichloride; Terephthalyl dichloride;
CLASSIFICATION
PHYSICAL AND CHEMICAL PROPERTIES
PHYSICAL STATE	white flake
MELTING POINT	79 - 81 C
BOILING POINT	266 C
SPECIFIC GRAVITY	1.34
SOLUBILITY IN WATER	Decomposes
pH
VAPOR DENSITY
AUTOIGNITION	> 450 C
NFPA RATINGS	Health: 3; Flammability:1 ; Reactivity: 0
REFRACTIVE INDEX
FLASH POINT	180 C
STABILITY	Stable under ordinary conditions
APPLICATIONS
Phthalic Acid, also called Benzenedicarboxylic Acid with formula C₆H₄(COOH)₂, is the name of any of three isomers. The ortho form (1,2-benzenecarboxylic acid) is called simply phthalic acid. It is a white crystals decomposing at 191°C and slightly soluble in water and ether. This compound is mainly produced and marketed in the form of its anhydride produced by the oxidation of orthoxylene and naphthalene. Its wide application is based on the ortho related carboxylic acid groups as their dehydration is highly reactive with broad processing conditions to produce various downstream products. It is used to make simple esters widely used as plasticizers. It is used as in making unsaturated polyester resins, alkyd resins, polyester polyols, dyes and pigments, halogenated anhydrides, polyetherimide resins, isatoic anhydride and insect repellents. The meta form is isophthalic acid (1,3-benzenecarboxylic acid). It is a white crystals subliming at 345°C slightly soluble in water, alcohol and acetic acid (insoluble in benzene). It is obtained by oxidizing meta-xylene with chromic acid, or by fusing potassium meta-sulphobenzoate, or meta-brombenzoate with potassium formate. IPA has excellent performance characteristics in coatings including excellent hardness, corrosion and stain resistance, hydrolytic stability of coatings and gel coats, excellent thermal stability and low resin color. It is a key ingredient in FRP markets for such products as marine, automotive, and corrosion resistant pipes and tanks. Polyesters containing isophthalic acid are also used extensively in industrial coatings applications for home appliances, automobiles, aluminum siding, and metal office furniture. It used as an intermediate for polyesters, polyurethane resins, plasticizers. The para form, known as terephthalic acid (1,4-benzenecarboxylic acid) is a combustible white powder insoluble in water, alcohol and ether; (soluble in alkalies), sublimes at 300°C. It can be produced by oxidizing caraway oil, a mixture of cymene and cuminol or by oxidizing para-diderivatives of benzene with chromic acid. TPA has been used mainly as a raw material of polyester fiber but lately it has been exploited for various uses such as non-fiber field, PET-bottle, PET-film and engineering plastics and as poultry feed additives. Phthalic acid derivatives are also widely used to make dyes, medicine, and synthetic perfumes, pesticides, and other chemical compounds. Acyl is a radical formed from an organic acid by removal of a hydroxyl group. The general formula of acyl compound is RCO-. Acyl halide is one of a large group of organic substances containing the halocarbonyl group, have the general formula RCO·X, where X is a halogen atom (fluorine, chlorine, bromine, iodine, and astatine) and R may be aliphatic, alicyclic, aromatic, and H etc. In substitutive chemical nomenclature, their names are formed by adding '-oyl' as a suffix to the name of the parent compound; ethanoyl chloride, CH₃COCl, is an example. The terms acyl and aroyl halides refer to aliphatic or aromatic derivatives, respectively. Acyl halides are made by replacing the -OH group in carboxylic acids by halogen using halogenating agents. They react readily with water, alcohols, and amines and are widely used in organic synthetic process whereby the acyl group is incorporated into the target molecules by substitution of addition-elimination sequence called acylation reaction. Acylation reaction involves substitution by an electron donor (nucleophile) at the electrophilic carbonyl group (C=O). Common nucleophiles in the acylation reaction are aliphatic and aromatic alcohols, both of which give rise to esters and amines (RNH₂) which give amides. The carboxylic acid (X = OH) itself can function as an acylating agent when it is protonated by a strong acid catalyst as in the direct esterification of an alcohol. Two common acylation agents, with the general formula RCOX, are acid halides (X = halogen atom) and anhydrides (X = OCOR). Schotten-Baumann reaction is an acylation reaction that uses an acid chloride in the presence of dilute alkali to acylate the hydroxyl and amino group of organic compounds. There are also other acylating agents. Terephthaloyl Chloride is used as an additive in polymers and fibers to improve flame, chemical and weather resistance and flexibility. It is used as a stabilizer for urethane prepolymers.
SALES SPECIFICATION
APPEARANCE	white flake
PURITY	98.0% min
MELTING POINT	75 C
TRANSPORTATION
PACKING
HAZARD CLASS	8 (`Packing Group: II)`
UN NO.	2923
PRICES