The physical and chemical properties and application of sodium hydroxide

Sodium hydroxide

[Physical and chemical properties] Sodium hydroxide is a common main strong base

[Preparation]

(1) Soda ash causticization method

(2) Electrolysis of NaCl aqueous solution

[Application] Sodium hydroxide has a wide range of uses.

In addition, before chemical cleaning, the equipment usually uses 1% to 2% sodium hydroxide solution for pretreatment of degreasing

When sodium hydroxide is used for cleaning, the impurity content should be required, especially when cleaning high-parameter boiler units, the chloride ion content should be strictly required

Urumqi Petrochemical Company has experienced several times of blockage of the ethylene glycol (EG) circulating spray system of the polycondensation unit .

The chloride ion content of different sodium hydroxide production methods varies greatly

The national standard GB209-1993 stipulates the quality standards of mercury method and causticizing method

Sodium hydroxide is soluble in ethanol and glycerin

The characteristics and precautions of using sodium hydroxide as a cleaning fluid are as follows:

① Sodium hydroxide achieves the purpose of removing animal and vegetable fats through saponification

The reaction product is soluble in water, and soap has the wettability of a surfactant

②Sodium hydroxide can transform strong acid and strong base salts.

③Sodium hydroxide has a strong corrosive effect on the human body, which can cause skin burns and damage to the iris of the eyes.

④Sodium hydroxide corrodes glass, can also cause some coatings to change color, and has corrosive effect on some metals, so care should be taken when selecting it