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                         Hydrofluoric Acid HF Acid

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Product Name             hydrofluoric acid

Other Names:              hydrofluoric acid, HF acid, Fluohydric acid;

                                   Fluorohydric acid; Fluoric acid; Hydrofluoric acid solution

CAS No.                      7664-39-3

Molecular Formula     HF

EINECS No.:                231-634-8

Appearance:              colorless and transparent liquid, with a strongly irritating smell

Purity                         30%~99%

UN No.:                       1790

Hazardous Grade       8

HS code:                     2811110000

Place of origin            Hubei Province, China

Annual output             5000MT

Payment Terms:          L/C, T/T, Western Union

Delivery Detail:            In 15 days on receipt of deposit

Properties

The product is a colorless, transparent liquid. It has a strongly pungent odor. It is very corrosive and strongly toxic. White fumes can rise from it in air. Boiling point, 19.5°C.

Uses

Oil refining

In a standard oil refinery process known as alkylation, isobutane is alkylated with low-molecular-weight alkenes (primarily a mixture of propylene and butylene) in the presence of the strong acid catalyst derived from hydrofluoric acid. The catalyst protonates the alkenes (propylene, butylene) to produce reactivecarbocations, which alkylate isobutane. The reaction is carried out at mild temperatures (0 and 30 °C) in a two-phase reaction.

Production of organofluorine compounds

The principal use of hydrofluoric acid is in organofluorine chemistry. Manyorganofluorine compounds are prepared using HF as the fluorine source, includingTeflon, fluoropolymers, fluorocarbons, and refrigerants such as freon.

Production of fluorides

Most high-volume inorganic fluoride compounds are prepared from hydrofluoric acid. Foremost are Na3AlF6, cryolite, and AlF3, aluminium trifluoride. A molten mixture of these solids serves as a high-temperature solvent for the production of metallic aluminium. Given concerns about fluorides in the environment, alternative technologies are being sought. Other inorganic fluorides prepared from hydrofluoric acid include sodium fluoride and uranium hexafluoride.

Etchant and cleaning agent

In metalworking hydrofluoric acid is used as a pickling agent to remove oxides and other impurities from stainless and carbon steels. It is used in thesemiconductor industry as a major component of Wright Etch and buffered oxide etch, which are used to clean silicon wafers. In a similar manner it is also used to etch glass by reacting with silicon dioxide to form gaseous or water-soluble silicon fluorides.

SiO2 + 4 HF → SiF4(g) + 2 H2O

SiO2 + 6 HF → H2SiF6 + 2 H2O

A 5% to 9% hydrofluoric acid gel is also commonly used to etch all ceramic dental restorations to improve bonding. For similar reasons, dilute hydrofluoric acid is a component of household rust stain remover and in car washes in "wheel cleaner" compounds. Because of its ability to dissolve iron oxides as well as silica-based contaminants, hydrofluoric acid is used in pre-commissioning boilers that produce high-pressure steam.

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Storage

The product should be stored in a storehouse with a shed and kept away from the sunlight. Strictly forbid storing it with combustibles and explosives together.

It should be treated as Grade A inorganic acid corrosive goods.

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