Introduction of Electronic Grade Sodium Hydroxide

Electronic grade sodium hydroxide, inorganic compound, chemical formula NaOH, also known as caustic soda, caustic soda, solid alkali, soda ash, caustic soda, molecular weight: 40.00. Sodium hydroxide has a strong alkaline, extremely corrosive, can be used as an acid neutralizer, with the masking agent, precipitation, precipitation masking agent, color developer, saponification agent, peel agent, detergent, etc., the use of a wide range. There are two methods for industrial production of sodium hydroxide: causticizing method and electrolysis method. Causticizing method is divided into soda ash causticizing method and natural alkali causticizing method according to different raw materials; electrolysis method can be divided into diaphragm electrolysis method and ion exchange membrane method.

The Use of Electronic Grade Sodium Hydroxide

1. Semiconductor manufacturing:

Electronic grade sodium hydroxide is one of the key materials in the semiconductor industry. It is used to clean semiconductor chips and silicon wafers to remove surface contaminants and oxidized layers to ensure the quality and performance of semiconductor devices.

2. Photovoltaic cell manufacturing:

In the solar cell manufacturing process, electronic grade sodium hydroxide is used to clean the surface of silicon wafers to remove surface impurities and oxides and improve the efficiency of solar cells.

3. Display manufacturing:

Electronic grade sodium hydroxide can be used to clean the glass substrate of liquid crystal display (LCD) and organic light-emitting diode (OLED) screen to ensure the clarity and quality of the screen.

4. Electronic components manufacturing:

In the manufacture of electronic components and circuit boards, electronic grade sodium hydroxide can be used to remove residual organics, oxides and other contaminants to ensure the reliability and performance of electronic equipment.

5. Glass manufacturing:

Sodium hydroxide is used in glass manufacturing for cleaning and treatment of glass surface to improve the quality and transparency of glass.

6. Electroplating industry:

In the electroplating process, electronic grade sodium hydroxide can be used to remove oxides and impurities from the metal surface to provide a clean substrate for electroplating.

7. Chemical research:

Electronic grade sodium hydroxide is also used in laboratory research, especially in the field of analytical chemistry and materials science.

The Preparation of Electronic Grade Sodium Hydroxide

1. Electrolysis method of preparation:

The most common method is to prepare sodium hydroxide by electrolyzing an aqueous solution of common sodium chloride (table salt). The preparation process includes the following steps:

(1) Electrolysis tank:

In an electrolyzer, sodium chloride (NaCl) is dissolved in water to form an electrolyte. This electrolyzer is usually made of special materials to prevent the introduction of impurities.

(2) Electrolysis process:

By applying electricity, chlorine ions (Cl-) in the electrolyzer are oxidized to chlorine gas (Cl2) and hydrogen (H2) is released at the anode, while at the cathode a water reduction reaction occurs to produce hydroxide ions (OH-). These hydroxide ions then combine with sodium ions (Na+) to form a sodium hydroxide solution.

(3) Concentration and purification:

The prepared sodium hydroxide solution undergoes a series of concentration and purification steps to remove impurities and concentrate the sodium hydroxide.

2. Ion exchange method preparation:

Another method of preparing high purity sodium hydroxide is to use ion exchange resin. This process includes the following steps:

(1) Ion exchange resin:

Using specially designed ion exchange resins, the sodium ions in them are replaced with hydroxide ions.

(2) Washing and regeneration:

The ion exchange resin that has been replaced with hydroxide ions is washed to remove impurities. The hydroxide ions in the resin are then exchanged with sodium chloride solution through the regeneration process to produce a high-purity sodium hydroxide solution.

3. Evaporation and crystallization:

In some cases, high purity sodium hydroxide solids can be obtained by evaporating the water and crystallizing it.