Description

Boric acid liquid is an inorganic compound with the chemical formula of H3BO3. It is a white crystalline powder with a greasy feel and no smell. It is widely used in the glass industry. It can improve the heat resistance and transparency of glass products, improve the mechanical strength, shorten the melting time, and can also be used as an antiseptic and disinfectant. It is used to produce high-grade glass and glass fiber such as optical glass, acid resistant glass and organic boron glass. It can improve the heat resistance and transparency of glass, improve the mechanical strength and shorten the melting time.It is used to produce various borates, such as sodium borohydride, ammonium hydrogen borate, cadmium borotungstate, potassium borohydride, etc. In the production of nylon intermediates, boric acid catalyzes the oxidation of hydrocarbons and generates esters to increase the yield of ethanol, thus preventing the further oxidation of hydroxyl groups to form ketones or hydroxyacids. Chemical fertilizer industry is used to produce candle wick and boron containing chemical fertilizer. It is used as an analytical chemical reagent to prepare buffer solution and various culture media for haploid breeding.

 

Chemical Formula

BH3O3

Exact Mass

62

Molecular Weight

62

m/z

62 (100.0%), 61 (24.8%)

Elemental Analysis

B, 17.48; H, 4.89; O, 77.63

 

The hydrolysis reaction of Boric acid liquid in sodium hydroxide solution produces boron hydroxide (HBO3) and sodium chloride (NaC1). The detailed synthesis steps of boron hydroxide further react to produce boric acid (HB02) and sodium hydroxide (NaOH) are as follows:

 

The chemical equation for the hydrolysis reaction of boron chloride (BCl3) in sodium hydroxide solution to produce boron hydroxide (HBO3) and sodium hydroxide (NaOH) are as follows:

 

The chemical equation for the hydrolysis reaction of boron chloride (BCl3) in sodium hydroxide solution to produce boron hydroxide (HBO3) and sodium chloride (NaCl) is:

 

BCl3 + 3H2O → HBO3 + 3NaCl

 

The chemical equation for the further reaction of boron hydroxide (HBO3) with sodium hydroxide (NaOH) to generate boric acid (HB02) and sodium hydroxide (NaOH) is:

 

HBO3 + NaOH → HB02 + NaOH

 

Preparation of raw materials.

 

Boron chloride (BCl3): As the main reaction raw material, it is necessary to ensure its purity and stability.

 

Sodium hydroxide solution: As a reaction medium, its concentration and purity need to be ensured.

 

Inert gas: used to protect the reaction system from oxidation and pollution.

 

Experimental equipment: including a reactor, condenser, collection bottle, etc., used for chemical reactions and product collection.

 

The specific steps are as follows:

 

(1) In a dry reactor, add a certain amount of boron chloride (BCl3) and sodium hydroxide solution. Ensure that boron chloride is completely dissolved in sodium hydroxide solution.

 

(2) Heat the reaction mixture to a certain temperature and maintain a constant temperature. This temperature should be sufficient to trigger hydrolysis reactions, but it will not lead to the occurrence of other side reactions.

 

The specific steps are as follows:

 

(1) In a dry reactor, add a certain amount of boron chloride (BCl3) and sodium hydroxide solution. Ensure that boron chloride is completely dissolved in sodium hydroxide solution.

 

(2) Heat the reaction mixture to a certain temperature and maintain a constant temperature. This temperature should be sufficient to trigger hydrolysis reactions, but it will not lead to the occurrence of other side reactions.

 

(3) During the heating process, boron chloride (BCl3) undergoes a hydrolysis reaction with water to produce boron hydroxide (HBO3) and sodium chloride (NaCl). This reaction is reversible and the reaction equilibrium can be adjusted by controlling the reaction conditions (such as temperature and time).

 

(4) After the hydrolysis reaction is completed, cool the reaction mixture to room temperature.

 

(5) Separate the generated boron hydroxide (HBO3) and sodium chloride (NaCl) through methods such as filtration or centrifugation.

 

(6) Further react boron hydroxide (HBO3) with sodium hydroxide (NaOH) solution to generate boric acid (HB02) and water. This reaction is direct and does not require controlling other conditions.

 

(7) Separate the generated boric acid (HB02) and sodium hydroxide (NaOH) through methods such as filtration or centrifugation.

 

(8) Finally, purity testing and property analysis are performed on the separated products to ensure that the obtained products meet the requirements.

 

1. Boric acid liquid can be used as glass and fiberglass to produce advanced glass and fiberglass such as optical glass, acid resistant glass, and organic boron glass. It can improve the heat resistance and transparency of glass, enhance mechanical strength, and shorten melting time. B2O3 plays a dual role as a flux and network forming agent in the manufacturing of glass and fiberglass. For example, in the production of fiberglass, the melting temperature can be lowered to facilitate drawing.

 

Generally speaking, B2O3 can reduce viscosity, control thermal expansion, prevent loss of permeability, improve chemical stability, and enhance mechanical and thermal shock performance. In glass production that requires low sodium content, boric acid is often mixed with sodium borate (such as pentahydrate borax or anhydrous borax) to adjust the ratio of sodium to boron. This is very important for borosilicate glass, as boron oxide has good solubility in low sodium and high aluminum conditions.

 

2. Enamel and ceramic industries are used in the production of glazes, which can reduce the thermal expansion and curing temperature of glazes, thereby preventing cracking and unglazing, and improving the gloss and fastness of products. For ceramics, enamel, and glaze, boron oxide is a good flux and network forming agent. It can form glass (at low temperature), improve the adaptability of green glaze, reduce viscosity and surface tension, increase refractive index, and improve mechanical strength, durability, and wear resistance.

 

3. It is an important component of lead-free glaze. High boron frits can quickly mature and form a smooth glaze, which is beneficial for coloring. Introduce B2O3 into the frit of fast firing glazed tiles using boric acid to meet the requirement of low sodium content. Adding borate to celluloid can alter its oxidation reaction and promote the formation of carbonization. Therefore, it can be flame retardant. Boric acid used alone or in combination with borax has a special effect on reducing the flammability of celluloid insulation materials, wood products, and cotton substrates in mattresses.

 

4. It can also be used as an adhesive. Boric acid is one of the components used to manufacture adhesive for corrugated paper. It is also a glue solvent for manufacturing cold protein and dextrin adhesives. Boric acid greatly improves wet adhesion strength by crosslinking hydroxyl groups.

 

There are two stable isotopes of natural Boric acid liquid, B-10 and B-11, with abundances of 19.78% and 80.22% respectively. B-10 has the unique characteristic of high neutron absorption. The absorption cross section of B-10 for thermal neutrons is 3837bar (1b=10, PA), the absorption cross section of natural abundance boron for thermal neutrons is close to 750bar, while that of B-11 is only 0.005bar. Therefore, the absorption cross section of B-10 for thermal neutrons is more than 5 times that of natural abundance boron, more than 20 times that of graphite, and more than 500 times that of traditional protective material concrete. That is to say, boron-10 isotope is an efficient thermal neutron absorber.

 

Therefore, it is indispensable in the safety and control system of nuclear power plant. Special grade (SQ) boric acid is used in the nuclear industry and has high boron-10 ratio. It is precisely because of this characteristic of B-10 isotope that B-10 isotope related products are widely used in military protection, nuclear weapons, nuclear industry and other military fields. Boric acid also has the function of vitrification at high temperature and can fix the diffusion of radioactive elements everywhere. In addition, boron-10 isotope can also be used as a neutron counter, a protective shield in nuclear reactors, an alignment rod, and a treatment for cancer.

 

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