Terephthaldehyde
Terephthaldicarboxaldehyde
CAS: 623-27-8
Molecular Formula: C8H6O2
Terephthaldehyde - Names and Identifiers
| Name | Terephthaldicarboxaldehyde |
| Synonyms | TPAL P-PHTHALALDEHYDE p-Phthalaldehdye terephthaldehyde Terephthaldicarbo p-Phthaldialdehyde 1,4-Phthalaldehyde terephthalaldehyde TEREPHTHALALDEHYDE TEREPHTHALDIALDEHYDE 4-Formylbenzaldehyde TEREPHTHALIC ALDEHYDE P-PHTHALICDICARBOXALDEHYDE benzene-1,4-dicarbaldehyde Terephthaldicarbozaldehyde Terephthaldicarboxaldehyde TEREPHTHALDICARBOXALDEHYDE Benzene-1,4-dicarboxaldehyde |
| CAS | 623-27-8 |
| EINECS | 210-784-8 |
| InChI | InChI=1/C8H6O2/c9-5-7-1-2-8(6-10)4-3-7/h1-6H |
| InChIKey | KUCOHFSKRZZVRO-UHFFFAOYSA-N |
Terephthaldehyde - Physico-chemical Properties
| Molecular Formula | C8H6O2 |
| Molar Mass | 134.13 |
| Density | 1,06 g/cm3 |
| Melting Point | 114-116 °C (lit.) |
| Boling Point | 245-248 °C (lit.) |
| Flash Point | 76 °C |
| Water Solubility | 3 g/L (50 ºC) |
| Solubility | Soluble in alcohol, soluble in ether, alkali, hot water, insoluble in cold water. |
| Vapor Presure | 0.25-0.46Pa at 20-25℃ |
| Appearance | White crystal |
| Color | White to light yellow |
| BRN | 385863 |
| Storage Condition | Store below +30°C. |
| Sensitive | Air Sensitive |
| Refractive Index | 1.4800 (estimate) |
| MDL | MFCD00006949 |
| Physical and Chemical Properties | Appearance: White needle-like crystals |
| Use | Is the main raw material for the production of fluorescent whitening agent, also used in the synthesis of dyes and drugs; Fine chemical intermediates |
Terephthaldehyde - Risk and Safety
| Hazard Symbols | Xi - Irritant |
| Risk Codes | R36/37/38 - Irritating to eyes, respiratory system and skin. R36/37 - Irritating to eyes and respiratory system. |
| Safety Description | S22 - Do not breathe dust. S24/25 - Avoid contact with skin and eyes. S36 - Wear suitable protective clothing. S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S37/39 - Wear suitable gloves and eye/face protection |
| WGK Germany | 1 |
| RTECS | WZ0430000 |
| TSCA | Yes |
| HS Code | 29122900 |
| Hazard Note | Irritant |
Terephthaldehyde - Upstream Downstream Industry
| Raw Materials | p-Xylene p-Xylene Chlorine Nitric acid |
Terephthaldehyde - Introduction
Can sublimate,
Last Update：2022-10-16 17:27:19
Terephthaldehyde - Reference Information
| LogP | 1 at 20.1℃ and pH6.6-6.8 |
| NIST chemical information | information provided by: webbook.nist.gov (external link) |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Introduction | p-phthalaldehyde is an important fine chemical raw material downstream of p-xylene, because there are two active aldehyde groups in its molecular structure, therefore, it can be self-polymerized or copolymerized with other monomers to form polymer materials, which are mainly used for the synthesis of fluorescent materials, catalyst carriers and other polymer products. The traditional production method of p-phthalaldehyde is obtained by chlorination of p-xylene and then hydrolysis under the action of nitric acid or metal oxide. |
| Application | is mainly used in the production of whitening agents, resins, plastics, pesticides and other fields; Bromocyclopentane is mainly produced by the synthesis of a variety of organic compounds; solid iodophor Disinfection agent is a new type of Disinfection agent, which is a surfactant as a carrier and is complexed with iodine element. It has the characteristics of broad spectrum, high efficiency, strong sterilization, strong stability and safe use, apply to the hospital before the operation of the skin Disinfection, oral, intestinal, urethral, cervical mucosa Disinfection. |
| preparation | benzyl chloride was obtained by chlorination with p-xylene, carbon tetrachloride, azobisisobutyronitrile and chlorine as raw materials and solvents, then the product was oxidized under the catalysis of nitric acid and zinc nitrate. The addition of zinc nitrate improved the yield of p-phthalaldehyde to more than 89%, and the purity of the product was more than 99.0%. The chlorination hydrolysis method usually uses highly toxic chlorine gas directly, which is not friendly to the environment. In order to avoid the direct use of chlorine, first of all, the use of N-fluoro BIS benzene sulfonamide and sodium chloride and p-xylene reaction, highly selective synthesis of p-dichlorobenzene, then through 98% concentrated sulfuric acid, manganese dioxide catalysis to obtain crude terephthalaldehyde, finally, the oxidation mother liquor was neutralized with sodium hydroxide and recrystallized from ethanol-water mixture to obtain p-phthalaldehyde. The weight yield of p-phthalaldehyde was 77%. |
| Use | used in the manufacture of dyes, fragrances, pharmaceuticals, plastics, fluorescent whitening agents. Pharmaceutical, pesticide, dye intermediates, is fluorescent. is the main raw material for the production of fluorescent whitening agent, also used in the synthesis of dyes and drugs used in perfume, plastic synthesis |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-09 02:00:10
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Raw Materials for Terephthaldehyde