16872-11-0 Usage
Description
Fluoroboric acid, also known as hydrofluoric acid or tetrafluoroboric acid, is a colorless, odorless, and highly corrosive liquid. It is a stable chemical substance that is completely soluble in water and is extremely reactive or incompatible with strong bases and cyanides. Fluoroboric acid is used in various industries due to its unique properties and is known for its corrosive nature towards metals and tissue.
Uses
1. Used in Electroplating Industry:
Fluoroboric acid is used as a catalyst for alkylation and polymerization, as well as a rewashing lotion for removing flux and electroplating parts from the metal substrate. It is also used as a solute in electrolytes for plating metals such as chromium, iron, nickel, copper, silver, zinc, cadmium, indium, tin, and lead, due to its high throwing power.
2. Used in Metal Cleaning:
Fluoroboric acid is used for cleaning metal surface oxide, silicate film, and as a corrosive agent for cleaning before aluminum and alloy electroplating. It is also used to clean metal and alloy surfaces prior to plating and as a metal surface cleaning agent.
3. Used in Diazonium Salts Stabilization:
Fluoroboric acid is used as a stabilizer for diazonium salts, which are important intermediates in the chemical industry. It is also used for preparing stabilized diazonium salts, such as diazonium and tetrazonium fluoborates.
4. Used in Organic Synthesis:
Fluoroboric acid is used as a catalyst in organic synthesis, including the preparation of acetals and esterifying cellulose. It is also used as a catalyst for acetaldehyde synthesis.
5. Used in Analytical Chemistry:
Fluoroboric acid is used as an agent for the determination of sodium in the presence of potassium ions and magnesium ions.
6. Used in Surface Treatment:
Fluoroboric acid is used in conjunction with various methods for cleaning and treating the surface of substrates. It is also used to brighten aluminum and as a radiotracer.
7. Used in Other Industries:
Fluoroboric acid is used in the sponge titanium and its alloys-dissolution, as well as in the printed wiring board industry.
Outline
Fluoroboric acid is also known as "hydrogen fluoroboric acid," "tetrafluoroborate boron-hydrogen acid." Chemical formula is HBF4. Molecular weight is 87.81. It is transparent colorless liquid, toxic, has a strong corrosion, it can not be stored in a glass container for a long time. Boiling point is 130 ℃, while it decomposes slowly. Dissolved in water and ethanol, thermal decomposition with water to generate oxygen fluorine boric acid and boron trioxide (may be concentrated to 30%), the solution was strongly acidic, it does not corrode glass at room temperature. Fluoroboric acid is a strong acid, only exists in solution, the common fluoroborate is potassium tetrafluoroborate.
Method: Can be prepared by the reaction of Concentrated hydrofluoric acid and boric acid.
Uses: used in light metal smelting and electroplating, etc. Even very dilute solution can also be used as fermentation inhibitors, also used for preparing diazonium salts, acetal catalyst, used as an agent for determination of sodium in the presence of magnesium and potassium ions. Aniline as raw materials in concentrated hydrochloric acid reacts with sodium nitrite to generate diazonium salt, then at a low temperature (-10 ℃), diazonium salt reacts with fluoroboric acid, final pyrolysis, can be prepared fluorophenyl.
The above information is edited by the lookchem of Yan Yanyong.
Toxicity
It has a strong corrosive effect on the skin, mucous membrane, has a irritative effect on the eyes and respiratory system. Even diluted to be very thin, it can hinder fermentation. Maximum allowable concentration is 2.5 mg/m3. If accidentally splashed on the eyes or body, flush eyes with water, wash contaminated body parts thoroughly with soap and water. In severe cases, sent the patient to the hospital. The operator must wear masks, rubber gloves and wear overalls.
Production method
Hydrofluoric acid method is according to the theoretical amount of hydrofluoric acid and boric acid ingredients, slowly adding boric acid to hydrofluoric acid under stirring, the reaction temperature was controlled below 40 ℃, stop mechanical stirring upon heating completed, placed at room temperature for more than 2h, then filtered and purified to obtain fluoroborate finished production.
4HF + H3BO3 → HBF3OH + HF + 2H2O
HBF3OH + HF → HBF4 + H2O
Toxicity grading
Poisoning
Flammability hazard characteristics
In case of hair H combustible pore-forming agent; thermal decomposition of toxic fluoride gas.
Storage Characteristics
Treasury ventilation low-temperature drying, stored separately from Cyanide, 3,7-dinitroso-1,3,5,7-tetraazobicyclo-nonane, alkalis.
Extinguishing agent
Sand, carbon dioxide
Professional standards
TWA 2.5 mg (fluorine)/cubic meter
Air & Water Reactions
Soluble in water with release of heat.
Reactivity Profile
Fluoroboric acid is a strong acid. Reacts exothermically with chemical bases (examples: amines, amides, and inorganic hydroxides). These reactions can generate dangerously large amounts of heat in small spaces. Dissolution in water or the dilution of a concentrated aqueous solution may generate significant heat. Reacts with active metals, including such structural metals as aluminum and iron, to release hydrogen, a flammable gas. Can initiate the polymerization of certain alkenes. Reacts with cyanide compounds to release gaseous hydrogen cyanide. Generates flammable and/or toxic gases in contact with dithiocarbamates, isocyanates, mercaptans, nitrides, nitriles, sulfides, and strong reducing agents. Additional gas-generating reactions occur with sulfites, nitrites, thiosulfates (to give H2S and SO3), dithionites (SO2), and carbonates. May catalyze (increase the rate of) chemical reactions. Attempted drying of the acid with acetic anhydride caused an explosion at 0°C [J. Organomet. Chem., 1975, 94, 319].
Hazard
Highly toxic, corrosive, irritant.
Health Hazard
TOXIC; inhalation, ingestion or skin contact with material may cause severe injury or death. Contact with molten substance may cause severe burns to skin and eyes. Avoid any skin contact. Effects of contact or inhalation may be delayed. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution.
Fire Hazard
Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.). Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated.
Flammability and Explosibility
Nonflammable
Safety Profile
A corrosive acid. When
heated to decomposition it emits toxic
vapors of B and F-.
Potential Exposure
Used as a catalyst for acetal synthesis
and cellulose esters; a metal surface cleaning agent; an alu minum electrolytic finishing agent; a stripping solution for
the removal of solder and plated metals; and an intermedi ate in making fluoroborate salt.
Shipping
UN1775 Fluoroboric acid, Hazard class: 8;
Labels: 8-Corrosive material.
Purification Methods
Crystallise fluoroboric acid several times from conductivity water. It can be stored in a glass vessel at room temperature. [Kwasnik in Handbook of Preparative Inorganic Chemistry (Ed. Brauer) Academic Press Vol I pp 221-222 1963.]
Incompatibilities
A strong acid. Reacts violently with
chemically active metals; strong bases, releasing flammable
hydrogen gas.
Check Digit Verification of cas no
The CAS Registry Mumber 16872-11-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,6,8,7 and 2 respectively; the second part has 2 digits, 1 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 16872-11:
(7*1)+(6*6)+(5*8)+(4*7)+(3*2)+(2*1)+(1*1)=120
120 % 10 = 0
So 16872-11-0 is a valid CAS Registry Number.
InChI:InChI=1/BF3.FH/c2-1(3)4;/h;1H
