Electronic Grade Gallic Acid

Electronic chemicals generally refer to electronic industry-specific chemicals. At present, there are tens of thousands of varieties with high quality requirements, low consumption, high cleanliness requirements for production and use environment, and fast replacement. Ultra-pure reagents are also a very important member of electronic chemicals, mainly used for chip cleaning (including drying), lithography, etching, development, film removal, doping, etc., involving more than 80 kinds of special chemicals. The reagent includes ultra-clean high purity acid base, ultra-clean high purity organic solvent and ultra-high purity etchant. Let's introduce the new product of this family-high purity gallic acid

Gallic acid (GA), also known as gallic acid and gallic acid, is white or light yellow needle-like crystal or powder, and its chemical name is 3,4,5-trihydroxybenzoic acid (3,4,5-Trihydroxyl benzoic acid).), Molecular formula C7H6O5, molecular weight 170.12, through it usually exists in the form of a monohydrate, the specific gravity is 1.694, melting point 235~240 ℃ (decomposition). Heating to 100~120 ℃ to lose crystal water: heating to 200 ℃ above the loss of CO2. Production of pyrogallic acid; Soluble in hot water, ether, ethanol, acetone and glycerin, insoluble in cold water, insoluble in benzene, acetic acid and chloroform; The lethal dose of subcutaneous injection in rats is 4000 mg/Kg: the pH value of aqueous solution is 3~4; Strong reducibility, astringent taste, can reduce gold, silver salt and Fehlin solution, react with ferric chloride to generate blue-black precipitate, it is an important fine chemical product mainly produced from gall or Tara.

Gallic acid has a wide range of uses and is widely used in organic synthesis, coatings, dyes, medicine, food, chemical industry, leather making, daily chemicals, agriculture, minerals, etc. It is mainly used in the manufacture of drugs, dyes, inks, food antioxidants, preservatives, metal extractants, ultraviolet absorbers, disinfectants, hemostatic astringents, imaging agents, chemical reagents, mud fluidizers and grape growth agents. In addition to meeting domestic demand, the products are mainly sold abroad. It is an important fine chemical raw material.

In recent years, the U.S. electronics industry has used electronic chemical grade high purity gallic acid to clean large integrated circuit boards.

Its quality requirements are particularly strict, and the main indicators are: GA ≥ 99.5%,Na, K, Fe, Cu, Pb, Al, Cr, Zn, Mn, Ni ≤ 0.1 mg/kg (I .e. residual amount) metal ions are 1*10-7). Therefore, the removal of trace metal ions in gallic acid is the key to the preparation of high purity gallic acid.