G. Bach et al., TRANSFER-LINE HEAT-EXCHANGER FOULING DURING PYROLYSIS OF HYDROCARBONS.1. DEPOSITS FROM DRY CRACKED GASES, Industrial & engineering chemistry research, 34(4), 1995, pp. 1132-1139
Isobutane of technical quality was pyrolyzed in nitrogen as a diluent
under standardized conditions (820-degrees-C, 0.4 s, N2/isobutane = 0.
4 g/g) in a specially developed, vertically positioned tubular flow re
actor coupled with a micro electrobalance. After cooling the dry crack
ed gases to temperatures thought to be representative for the innertub
e surface temperatures of a TLE (transfer-line exchanger), the growth
of carbon-rich deposits (known as TLE fouling) was measured continuous
ly at the surfaces of material coupons in dependence on (i) the prehis
tory and (ii) the sort of materials as well as (iii) the temperatures.
The results show clearly that on low alloyed steels catalytic reactio
ns can play an important role in TLE fouling if dry cracked gases are
used.