Handbook of Solvents - George Wypych - ChemTech - Ventech!

1232 Krzysztof M. Benczek, Joanna Kurpiewska
18.2.7.3 The influence of air velocity on emission
Air velocity was measured with a TSI air velocity meter in range 0.2- 1.5 m/s. Temperature
was 20 o C. The relationship has linear character and the equations expressing emissions
[g/m 3 /h] relative to air velocity [m/s] for different solvents are:
trichloroethylene E= 657 × v + 1766
naphtha solvent E= 109 × v + 159
naphtha anti-corrosive E= 9.1 × v + 14.53
1-butanol E= 72 × v + 121
1,1,1- trichloroethane E= 1403 × v + 2120
extraction naphtha E= 632 × v + 830
petroleum(mineral) spirits E= 160 × v + 242
wood preservatives E = 516 × v
18.2.7.4 The relationship between the mass of solvent on wet parts and
emissions
The amount of solvent carried out on a degreased part depends on its surface, shape and
roughness and on the viscosity and density of the solvent. The amount of solvent carried out
on a degreased surface was measured by gravimetric method. Tests show that the amount of
solvent retained on 1 m 2 of flat surface is:
trichloroethylene 34.7 g
naphtha solvent 26.0 g
naphtha anti-corrosive 34.5 g
1-butanol 31.3 g
1,1,1- trichloroethane 38.5 g
extraction naphtha 19.0 g
petroleum(mineral) spirits
18.2.8 EMISSION OF SOLVENTS
19.2 g
Combining these factors, the final equations for the evaluated solvents are:
trichloroethylene E= (657v + 63.6t + 699.6) × Pr + 34.7P [18.2.5]
naphtha solvent E= (109v + 9.3t + 4.9) × Pr + 26P [18.2.6]
naphtha anti-corrosive E= (9.1v + 0.55t + 5.65) × Pr + 34.5P [18.2.7]
1-butanol E= (72v + 6.3t + 17) × Pr + 31.3P [18.2.8]
1,1,1- trichloroethane E= (1403v + 94.7t + 805.6) × Pr + 38.5P [18.2.9]
extraction naphtha E= (632v + 49.5t + 1147) × Pr + 19P [18.2.10]
petroleum(mineral) spirits E= (160v + 12t + 76.7) × Pr + 19.2P [18.2.11]
wood preservatives E= (516v + 2t + 42) × Pr [18.2.12]
where:
E emission of the solvent, g/h
v air velocity near the surface of solvent (in still air it is 0.3 m/s)
t temperature, o C
Pr the surface of solvent, m 2
P the surface of elements degreased in one hour, m 2 /h.
18.2.9 VERIFICATION IN INDUSTRIAL CONDITIONS
Research was conducted in an industrial hall where an ALDI machine was used for
degreasing with trichloroethylene vapor. The volume of the solvent was 1000 dm 3 , the surface
area was 0.825 m 2 (110 cm by 75 cm). A metal basket with degreased parts was intro-