safe treatment of organic contaminated spent acids - … · safe treatment of organic contaminated...
TRANSCRIPT
Safe Treatment of
Organic Contaminated Spent Acids
Dr. Hansjuergen Winterbauer Director Development / Patents PLINKE GmbH Bad Homburg, Germany
The Company
Established 1947 Independent engineering company, 35 employees Registered office at Bad Homburg, Germany World leading supplier of Acid Treatment Plants Most reference plants in this field world wide Member of Chematur Group
Frankfurt / Main
Bad Homburg vor der Höhe
Airport
References
North/SouthAmerica
Europe
Africa
Asia
Industrial Applications (1994-2014)
27%
13%
19%
11%
30%
Polyurethanes
Chemicals / Others
Nitric Acid
Explosives
Fibres / Laquers
Explosives and Propellants
Nitro-Ester (Propellants)
Nitrocellulose (NC)
Nitroglycerine (NG)
Nitroguanidine (Nigu)
Nitro-Ester (Others)
Ethyleneglycoldinitrate (EGDN)
Diethylenglycoldinitrate (DEGDN)
Metrioltrinitrate (MTN)
Propyleneglycoldinitrate (PGDN)
Butanetrioltrinitrate (BTTN)
Nitric / Acetic Acid Based Explosives
RDX / HMX / PETN
Nitroaromatics
Nitrobenzene (NB)
Nitrotoluene (MNT)
Dinitrotoluene (DNT)
Trinitrotoluene (TNT)
Picric Acid
A small leak will sink a great ship.
Nitrocellulose Plant Taiwan 2013
Nitroglycerin as Example for Treatment of Nitro Ester
General safety aspects
Liquid phase decomposition
Accelerating effects on decomposition
Main criteria for safe treatment:
Stabilisation
Spent Acid Recovery Process
Separation
Nitric Acid High Concentration NOx Absorption
Sulfuric Acid Concentration
General Safety Aspects
Separation of not dissolved organic material
Controlled complete decomposition
Safe handling of gas development
Selection of most suitable
treatment conditions
No dangerous compounds to
enter the following steps!
Liquid Phase Decomposition
Liquid Phase Decomposition
Suitable surplus of acid to remove the energy
0
2
4
6
8
10
12
14
16
18
110 120 130 140 150 160 170
T °C
p m
mH
g
vapor pressure of NG
Gas cooler/condenser for maximum recovery
Defined temperature for decomposition
Separation of gas
Accelerating Effects on Decomposition
HNO3 increase of velocity
HNO3 Decomposition: 2 HNO3 -> NO2 + NO + H2O + O2
NO no influence
NO2 increase of velocity
O2 increase of velocity
H2O increase of velocity
Increasing the velocity of decomposition by making use of catalytic effects of decomposition by-products
NG-Decomposition: C3H5(NO3 )3 + 3 HNO3 -> 2 NO2 + 4 NO + 4 H2O + 3 CO2
Influence of NO2 on the Velocity of
NG Decomposition
0
1
2
3
4
5
6
7
0 0,2 0,4 0,6 0,8 1 1,2
Time
Dec
ompo
sitio
n R
ate
800 mm350 mm150 mm
High Concentration Fast Reaction
Low Concentration Slow Reaction
Accelerating Effects during Storage
to be avoided
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