Technical formula and production process of sodium m-nitrobenzene sulfonate

Sodium m-nitrobenzenesulfonate (m-nitrobenzenesulfonic acid sodium salt), also known as resist salt S (resist saltS), anti-agent S (ludigol S), of the formula C _.
6 H _.
4 NNaO _.
5 S, molecular weight of 225.
16, the formula for

1.
Product performance

Yellow amorphous particles or powder; melting point 70℃; easily soluble in water (25g/100mL water), soluble in ethanol , ether , acetone ; acid, alkali, and hard water resistance; oxidizing in neutral and alkaline media , Can offset the reducing power of insurance powder and carved white block
.

2.
Production principle

The benzene is sulfonated with sulfuric acid and then nitrated with nitric acid to obtain m-nitrobenzenesulfonic acid, then neutralized with milk of lime, and replaced with sodium carbonate or sodium hydroxide to obtain the finished product
.

3.
Process flow

4.
Technical formula (kg/t)

5.
Main equipment

Reaction kettle, neutralization tank, storage tank, suction filter, crystallizing pot, oven
.

6.
Production process

Add 460kg of sulfuric acid (98%) and 335kg of fuming sulfuric acid into a stirred dry enamel reactor
.
Stir, cool to below 30℃, add 335kg of benzene within 1.

Add 580kg of water and 460kg of lime milk to the neutralization tank, stir, and add the above-mentioned nitrification product within 1h
.
After the neutralization reaction is completed, 420kg of liquid caustic soda (30%) is added to carry out a displacement reaction until the pH of the material is 7-8

Related links: Production principle and process flow of m-aminobenzene sulfonic acid