Production principle of m-aminobenzoic acid

M-aminobenzoic acid (m-aminobenzoic acid), also known as 3-aminobenzoic acid, of the formula C _.
7 H _.
7 NO ₂ , a molecular weight of 137.
14, the formula

1.
Product performance

White or light yellow crystals; melting point 174℃; relative density (d ₄ ²⁰ ) 1.
5105; slightly soluble in cold water, cold alcohol and cold chloroform, soluble in acetone , soluble in boiling water, hot ethanol, hot chloroform and ether , insoluble in benzene , Gasoline; sweet, sublimable, but partially decomposed; toxic; acidic and corrosive
.

2.
Production principle

1) Catalytic hydrogenation method

Meta-nitrobenzoic acid is catalyzed by palladium-carbon and hydrogen-catalyzed reduction to obtain meta-aminobenzoic acid
.

2) Iron powder reduction method

M-nitrobenzoic acid is reduced with iron powder in acid medium to obtain m-aminobenzoic acid
.

3.

1) Catalytic hydrogenation method

2) Iron powder reduction method

4.

5.

1) Catalytic hydrogenation method

Dissolving and decolorizing kettle, hydrogenation kettle, filter, acidification kettle, dryer

2) Iron powder reduction method

Reduction kettle, plate and frame filter press, acidification pot, vacuum filter, storage tank, dryer

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