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CAS NUMBER: 98536-58-4
EC NUMBER: 231-891-6
MOLECULAR FORMULA: NaBO2
MOLECULAR WEIGHT: 65.80
IUPAC NAME: sodium;oxido(oxo)borane
Sodium Metaborate is an inorganic sodium salt having metaborate as the counterion.
Sodium Metaborate is an inorganic sodium salt and a member of borate salts.
Sodium Metaborate is a colorless solid chemical compound of sodium, boron, and oxygen with formula NaBO2.
The formula can be written also as Na2O·B2O3 to highlight the relation to the main oxides of sodium and boron
Solid anhydrous sodium metaborate crystallizes in the hexagonal space group.
Sodium Metaborate actually contains the trimeric anion [B3O6]3−.
The six oxygen atoms are evenly divided into two distinct structural sites, with different B–O bond lengths (about 128 and 143 pm, respectively)
Sodium Metaborate, a derivative of the borax compound, has a wide range of industrial applications.
Sodium Metaborate is used as a source of boron in the production of sodium borohydride (NaBH 4 ), which is a medium for hydrogen storage.
Hydrates and Solubility:
The following hydrates crystallize from solutions of the proper composition in various temperature ranges:
-tetrahydrate NaBO2·4H2O from −6 to 53.6 °C
-dihydrate NaBO2·2H2O from 53.6 °C to 105 °C
-hemihydrate NaBO2·0.5H2O from 105 °C to the boiling point.
Early reports of a monohydrate NaBO2·H2O have not been confirmed.
The anhydrous salt can be prepared from the tetraborate by heating to 270 °C in vacuum
Preparation:
Sodium Metaborate is prepared by the fusion of sodium carbonate and boron oxide B2O3 or borax Na2B4O7.
Another way to create the compound is by the fusion of borax with sodium hydroxide at 700 °C:
B2O3 + 2 NaOH → 2 NaBO2 + H2O
The boiling point of sodium metaborate (1434 °C) is lower than that of boron oxide (1860 °C) and borax (1575 °C) In fact, while the metaborate boils without change of composition, borax gives off a vapor of sodium metaborate with a small excess of sodium oxide Na2O
Electrochemical Conversion to Borax:
Electrolysis of a concentrated solution of 20% NaBO2·4H2O with an anion exchange membrane and inert anode (such as gold, palladium, or boron-doped diamond) converts the metaborate anion to tetraborate B4O2−7, and the sodium salt of the later (borax) precipitates as a white powder
Reduction to Sodium Borohydride:
Sodium Metaborate is also a byproduct of hydrolysis of sodium borohydride NaBH4, a proposed hydrogen storage material for hydrogen-fueled vehicles that is safer (stable in dry air) and more efficient on a weight basis than most other alternatives.
The reaction is:
NaBH4 + 2 H2O → NaBO2 + 4 H2 and requires a catalyst.
To be economical, that approach would require a cheap and efficient method to recycle the metaborate to the borohydride.
Several methods have been studied, such as the reaction with various reducing agents at high temperatures and pressure, or with magnesium hydride MgH2 by ball milling at room temperature, followed by extraction of the NaBH4 with isopropylamine.
NaBO2 + 2 MgH2 → NaBH4 + 2 MgO
Another alternative that has been considered is the electrolytic reduction of a concentrated sodium metaborate solution, namely
BO2−2 + 6 H2O + 8 e− → BH−4 + 8 HO−
However, this method is not efficient since it competes with the reduction of hydroxide, 4 HO−→ 2 H2O + O2 + 4 e−
Conversion to Sodium Alkoxides:
Anhydrous sodium metaborate refluxed with methanol yields the corresponding sodium methoxyborate:
Na+[BO2]− + 4 CH3OH → Na+[B(OCH3)4]− + 2 H2O
The analogous reaction with ethanol yields the ethoxyborate.
Uses:
Sodium Metaborate is used in the manufacturing of borosilicate glasses.
Sodium Metaborate is also a component of herbicides and antifreeze products.
Metabolism/Metabolites:
Boric acid, sodium salt and borates are not metabolized, neither do they accumulate in the body except for low deposit in bone.
No organic boron compounds have been reported as metabolites.
Essential Buffering Agent
Used in the preparation of starch and dextrin adhesives, this product provides increased viscosity, quicker tack, and better fluidity.
In textile processing, sodium metaborate helps to stabilize hydrogen peroxide solutions and neutralizes acidic oxidation by-products.
APPLICATION AND BENEFITS
Adhesives:
Sodium Metaborate’s high alkalinity and the cross-linking reaction of borate anions with polyhydroxy groups makes it an excellent choice for starch- and dextrin-based adhesives.
The adhesives it helps to produce are essential for use in corrugated boxes, paper bags, laminated paper boards, carton and case sealing, gummed tape, and tube winding.
Photography:
Sodium Metaborate is also a component of photographic developers and replenishers.
Sodium Metaborates principal function is as a buffering agent, used to tightly control the pH of the solutions.
As such, it produces high-quality fine-grain black-and-white developers and helps to ensurethe correct color balance in color developers.
Bleaching agent:
Textiles, such as cotton, are bleached with hydrogen peroxide solutions.
These solutions can be stabilized by using sodium metaborate.
Sodium Metaborate also neutralizes the acidic oxidation by-products that form during bleaching.
And, textile manufacturers can control textile sizing by incorporating sodium metaborate-produced starch adhesive material within the thread and binding all the fibers together to increase the thread’s tensile strength.
Cleaners:
As an ingredient in hard-surface cleaners, sodium metaborate helps to remove oil, grease, rust, scale, and other particulates from metal or glass surfaces.
The borate imparts alkaline conditions that enhance the product’s cleaning action.
Sodium Metaborate can also be incorporated into liquid laundry detergents for pH control, enzyme stabilization, and its builder properties.
Many proprietary water-treatment chemicals also include sodium metaborate to control pH and inhibit corrosion.
Such chemicals are used on heating systems and cooling towers as protection against corrosion.
In automotive and industrial fluids, sodium metaborate can be used for anti-corrosion and reaction with acidic degradation products.
Borates are also being developed as an alkaline agent in several enhanced oil recover (EOR) processes, such as alkali-polymer and alkali-surfactant-polymer (ASP) flooding.
Tertiary oil recovery from borate-based ASP core floods is comparable to that obtained with similar formulations that contain conventional alkalis and exhibit no injectivity problems in core flood trials.
APPLICATIONS OF SODIUM METABORATE:
-Adhesives
-Photography
-Bleaching agent
-Cleaners
-Paper industry
-Plating
-Cleaning agents
-Industry derived products
-Manufacture of heat resistant products
Sodium Metaborate is stable at ordinary temperatures.
However, if exposed to the atmosphere for extended periods, it picks up carbon dioxide from the air and forms sodium carbonate and borax.
Sodium Metaborate 4 mol will convert to 8 mol when exposed to a humid atmosphere.
Sodium Metaborate 4 mol crystalline salt begins to lose water at about 194°F (90°C).
The anhydrous salt fuses to a clear glass at 1770°F (966°C).
Some vaporization occurs above 2246°F (1230°C).
Sodium Metaborate 8 mol crystalline salt begins to lose water at about 128°F (53.5°C).
The anhydrous salt fuses to a clear glass at 1770°F (966°C), and some vaporization occurs above 2246°F (1230°C).
Aqueous solutions of sodium metaborate 4 mol and 8 mol show a moderate increase in pH with increasing concentrations.
Sodium Metaborate is the sodium salt of Metaborate.
Sodium Metaborate is used in the manufacturing of borosilicate glasses.
Sodium Metaborate is also a component of herbicides and antifreeze.
Sodium Metaborate can also be used as an oil additive with anti-wear properties.
Sodium Metaborate electroreduction in the alkaline system can act as a novel desulphurization process of coal water slurry.
Sodium Metaborate also has role in hydrolysis of sodium borohydride to minimize the water utilization.
Sodium Metaborate can also act as a novel alkali in alkali/surfactant/polymer flooding.
Sodium Metaborate is also useful in the thermo-chemical production of sodium borohydride, which is a safe and practical hydrogen storage material for on-board hydrogen production.
Also available commercially as octahydrate and tetrahydrate.
Agricultural Uses:
-Herbicide
-Insecticide
-Fungicide
-Nematocid
Sodium Metaborate tetrahydrate is used In textile industry
Sodium Metaborate is used as additives, process aid and flame retardant.
Sodium Metaborate Octahydrate is generally immediately available in most volumes.
High purity, submicron and nanopowder forms may be considered.
Reagent and Technical Grade;
Typical and custom packaging is available.
Sodium Metaborate's Category is Metalloid Compounds
Sources/Uses:
Used in;
-cleansersdetergents
-adhesives
-photographic solutions
Also used as:
a fire retardant in sodium chlorate
-a defoliant
-a textile finishing agent
-a sequestrant;
Tetrahydrate: Used as
-an insecticide
-fungicide
-nematocide
-herbicide (non-crop land, cotton production, and under asphalt);
Sodium Metaborate is a colorless solid chemical compound of sodium, boron, and oxygen with formula NaBO₂.
The formula can be written also as Na₂O·B₂O₃ to highlight the relation to the main oxides of sodium and boron.
Sodium Metaborate, a derivative of the borax compound, has a wide range of industrial applications.
Recently, it is used as a source of boron in the production of sodium borohydride (NaBH4), which is a medium for hydrogen storage.
In the present study, sodium metaborate tetrahydrate (SMT, NaB(OH)(4)center dot 2H(2)O) was produced by the reaction of borax (B) with the sodium hydroxide (SH) solution under ultrasonic irradiation.
The effect of the reaction parameters (amount of water. temperature, particle size, and time) on the production of sodium metaborate tetrahydrate was investigated in the present study.
Sodium Metaborate was shown that the reaction parameters (amount of water, temperature, and time) played a significant role in the synthesis of sodium metaborate tetrahydrate.
In addition, the concentration of characteristic B-O group in the reaction solution was quantitatively determined by Fourier Transform Infrared Spectroscopy (FTIR).
The optimum condition for the production process included 26% water by weight, borax particles of size -250+150 mu m and irradiation time of 60 min at 80 degrees C.
Sodium Metaborate is An alkaline salt with excellent buffering properties.
Sodium Metaborate Can also be used in the production of adhesives due to the high degree of alkalinity and the crosslinking reaction of borate anions with polyhydroxy groups.
Sodium Metaborate is often used as a component of most photographic developers and replenishers.
Typically, it acts as a buffering agent in order to control acidity levels.
In addition to such applications, the compound is commonly utilized as an adhesive as well.
A very specific effect of the compound can be seen in the preparation of starch and dextrin adhesives due to its high degree of alkalinity.
An interchain linkage will produce an adhesive that has powerful viscosity, along with quicker tack and much more fluid properties.
All of these qualities make this adhesive essential in a wide variety of different industries.
Sodium Metaborate can be commonly used in corrugated boxes, most paper bags, various paper boards, and gummed tape.
Such versatile applications make it a desired compound for most household items and applications
Sodium Metaborate, a derivative of the borax compound, has a wide range of industrial applications.
Recently, Sodium Metaborate is used as a source of boron in the production of sodium borohydride (NaBH₄), which is a medium for hydrogen storage.
In the present study, sodium metaborate tetrahydrate (SMT, NaB(OH)₄·2H₂O) was produced by the reaction of borax (B) with the sodium hydroxide (SH) solution under ultrasonic irradiation.
The effect of the reaction parameters (amount of water, temperature, particle size, and time) on the production of sodium metaborate tetrahydrate was investigated in the present study.
Sodium Metaborate was shown that the reaction parameters (amount of water, temperature, and time) played a significant role in the synthesis of sodium metaborate tetrahydrate.
In addition, the concentration of characteristic B–O group in the reaction solution was quantitatively determined by Fourier Transform Infrared Spectroscopy (FTIR).
The optimum condition for the production process included 26% water by weight, borax particles of size −250+150μm and irradiation time of 60min at 80°C
PHYSICAL PROPERTIES OF SODIUM METABORATE:
-Molecular Weight: 65.80
-Exact Mass: 65.9889037
-Monoisotopic Mass: 65.9889037
-Topological Polar Surface Area: 40.1 Ų
-Physical Description: Liquid
-Color: White
-Form: powder/White hexagonal crystals
-Odor: Odorless
-Boiling Point: 1434 °C
-Melting Point: 966 °C
-Solubility: In water, 36 g/100 g
-Density: 2.46 g/cu cm
-Stability/Shelf Life: Stable on storage
-pH: Solution is strongly alkaline when dissolved in water
-Enthalpy of fusion: 36.2 kJ/mol at 966 °C
Sodium Metaborate is a colorless solid chemical compound of sodium, boron, and oxygen.
Sodium Metaborate is an inorganic sodium salt having metaborate as the counterion.
Sodium Metaborate is an inorganic sodium salt and a member of borate salts.
CHEMICAL PROPERTIES OF SODIUM METABORATE:
-Hydrogen Bond Donor Count: 0
-Hydrogen Bond Acceptor Count: 2
-Rotatable Bond Count: 0
-Heavy Atom Count: 4
-Formal Charge: 0
-Complexity: 13.5
-Isotope Atom Count: 0
-Defined Atom Stereocenter Count: 0
-Undefined Atom Stereocenter Count: 0
-Defined Bond Stereocenter Count: 0
-Undefined Bond Stereocenter Count: 0
-Covalently-Bonded Unit Count: 2
-Compound Is Canonicalized: Yes
-Corrosivity: NON-CORROSIVE TO FERROUS METALS
STORAGE OF SODIUM METABORATE:
Sodium Metaborate should be stored at room temperature.
Sodium Metaborate should be stored in a moisture-free environment.
Sodium Metaborate should be stored in dry place.
Sodium Metaborate should be stored in tightly closed containers.
Sodium Metaborate should be stored separately from other reagents.
Sodium Metaborate should be stored at constant atmospheric pressure.
Sodium Metaborate should be kept away from places where it can get moisture.
Sodium Metaborate should preferably be stored in glass bottles.
Sodium Metaborateshould be kept in a clean, well-ventilated place.
SYNONYMS:
disodium borate, heptahydrate
disodium borate, monohydrate
Komex
monosodium metaborate
sodium borate
sodium borate (NaBO2)
sodium diborate
sodium meta borate
sodium metaborate
sodium tetraborat
Kodalk
sodium;oxido(oxo)borane
Boric acid, monosodium salt
UNII-Z6Q395A23R
Sodium(1+), (metaborato-O)-
Borosoap
Z6Q395A23R
Boric acid (HBO2), sodium salt (1:1)
Sodium Metaborate, anhydrous
Sodium borate (NaBO2)
SODIUMMETABORATE
NaBO2
EC 231-891-6
SODIUM METABORATE GR
DTXSID2034386
CHEBI:75227
AKOS024426998
