Ethylene Diamine Dihydrate
Formula
C₂H₄(NH₂)₂ · 2H₂O
Preparation
Ethylene diamine is prepared by reacting 1,2-dichloroethane with ammonia under high pressure at around 180°C. This reaction forms ethylene-diamine hydrochloride, which is then recrystallized with water to obtain ethylene diamine dihydrate.
Tests for Purity
- Ammonia and other bases: Less than 0.5%
- Heavy metals and iron: Less than 20 ppm
- Non-volatile matter: Less than 0.02% w/w
Assay
The compound can be assayed by:
- Acid-base titration using 1 M HCl with 10 g of sample.
- Titration using N/1 HCl with bromophenol blue as indicator, confirming formation of the dihydrochloride.
Uses
- Used as a starting material for producing many industrial chemicals.
- Important in the manufacture of EDTA (a major chelating agent).
- Ethylene-bis-dithiocarbamate salts derived from it are used as commercial fungicides.
Detailed Notes:
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