312
G Case Study Solutions
Table G.5
Total calculated impacts for each material and energy flow for each of the midpoint impacts. Total impacts for the production of all reactants,
wastes, and heat used are also shown. Results are rounded to three significant figures
Material or energy flow
Category Climate change IPCC
2013 100 yr [kg
CO
2 -eq]
Total CED [MJ-eq] USEtox ecotoxicity
[CTU
e ] a
USEtox total human
toxicity [CTU
h ] b
3-Chloro-2-isopropylthio aniline
Reactant 1460
31,500
5670
5.03
× 10 −4
Copper(I) cyanide (CuCN)
Reactant 594
10,000
234,000
1.91
× 10 −2
Sodium sulfide (Na
2 S)
Reactant 458
6350
2540
2.58
× 10 −4
3-Methylpyridine (clean)
Solvent
1930
39,100
34,900
9.28
× 10 −4
Methyl ethyl ketone (clean)
Solvent
326
11,200
648
5.58
× 10 −5
3-Methylpyridine (waste)
Waste
−426
−620
−183
−1.70 × 10 −5
Methyl ethyl ketone (waste)
Waste
−365
−531
−157
−1.46 × 10 −5
Steam
Heat
23.1
349
17.3
1.85
× 10 −6
Total for reactants and solvents
4768
98,150
277,758
2.08
× 10 −2
Total for wastes
−791
−1151
−340
−3.16 × 10 −5
Grand total (reactants, solvents, waste, and heat)
4000
97,348
277,435
2.08
× 10 −2
a
CTU
e = comparative toxic units for ecotoxicity
b
CTU
h = comparative toxic units for human toxicity