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1.What is 4-Hydroxybenzoic acid?
ChEBI: 4-hydroxybenzoic acid is a monohydroxybenzoic acid that is benzoic acid carrying a hydroxy substituent at C-4 of the benzene ring. It has a role as a plant metabolite and an algal metabolite. It is a conjugate acid of a 4-hydroxybenzoate.
2.What is it used for?
4-Hydroxybenzoic acid is used as an intermediate for dyes, antiseptics and active pharmaceutical ingredients. It is also used as a food preservative, corrosion inhibitor, anti-oxidant and an emulsifier. It reacts with 6-hydroxynaphthalene-2-carboxylic acid to prepare aromatic polyester called Vectran fiber. It acts as a precursor to prepare p-hydroxyphenylbenzoate, p-acetoxybenzoyl chloride and 4,4'-dihydroxybenzophenone. Further, it is used in paint additives, coating additives, processing aids, electrical and electronic products. In addition to this, it acts as a preservative in cosmetics and some ophthalmic solutions.
In organic. syntheses; intermediate for dyes, fungicides.
p-Hydroxybenzoic acid is of significant commercial importance. The most familiar application is the use of several of its esters as preservatives, known as parabens. Also of interest is the use in liquid crystal polymer applications.
4-Hydroxybenzoic acid can be used as a starting material to synthesize organic intermediates such as 4-acetoxybenzoic acid and 4-hydroxy-3,5-diiodobenzoic acid.
4-Hydroxybenzoic acid is used as an intermediate for dyes, antiseptics and active pharmaceutical ingredients. It is also used as a food preservative, corrosion inhibitor, anti-oxidant and an emulsifier. It reacts with 6-hydroxynaphthalene-2-carboxylic acid to prepare aromatic polyester called Vectran fiber. It acts as a precursor to prepare p-hydroxyphenylbenzoate, p-acetoxybenzoyl chloride and 4,4′-dihydroxybenzophenone. Further, it is used in paint additives, coating additives, processing aids, electrical and electronic products. In addition to this, it acts as a preservative in cosmetics and some ophthalmic solutions.
3.What are the specifications of this product?
| Product Name: | 4-Hydroxybenzoic acid |
| CAS: | 99-96-7 |
| MF: | C7H6O3 |
| MW: | 138.12 |
| EINECS: | 202-804-9 |
| Melting point | 213-217 °C (lit.) |
| Boiling point | 213.5°C (rough estimate) |
| density | 1,46 g/cm3 |
| vapor pressure | 0Pa at 20ºC |
| refractive index | 1.4600 (estimate) |
| FEMA | 3986 | 4-HYDROXYBENZOIC ACID |
| Fp | 199 °C |
| storage temp. | Store below +30°C. |
| solubility | metha nol: soluble5%, clear to slightly hazy, colorless to faintly yellow |
| pka | 4.48(at 19ºC) |
| form | Crystalline Powder |
| color | White to ivory |
| PH | 3.3 (1g/l, H2O, 20ºC) |
| Odor | at 100.00 %. phenolic nutty |
| Odor Type | phenolic |
| Water Solubility | 5 g/L (20 ºC) |
| Merck | 14,4812 |
| JECFA Number | 957 |
| BRN | 970950 |
| InChIKey | FJKROLUGYXJWQN-UHFFFAOYSA-N |
| LogP | 0.878 at 22ºC |
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