Empirical method for carbonaceous substances production estimation and effect of N2 during trifluoromethane pyrolysis

- The formation rate of carbonaceous substances was firstly estimated with Voorhies formula.
- The effect of diluent N2 on formation rate of carbonaceous substances was firstly discussed.
- The Voorhies formula was firstly modified in the presence of diluent N2.
- The parameter in Voorhies formula and modified Voorhies formula was determined.
- The formation rate of carbonaceous substances could be effectively predicted.

A simple and effective empirical method for carbonaceous substances production estimation and the effect of diluent N2 on it during pyrolysis of trifluoromethane (R23) was firstly studied at the temperatures of 973 K to 1223 K and residence times of 4 s to 40 s. The products were identified and quantified by using GC-MS and GC-FID respectively. The production of carbonaceous substances could be expressed as Voorhies formula of Cn = Atn and the parameter n was approximately constant as 0.67, while A could be expressed with pyrolysis temperature as A = 4537 × exp (−1.58 × 104/T) through simulating the experimental data from 973 K to 1173 K. The production of carbonaceous substances at temperature of 1223 K and residence times from 4 s to 9 s could be effectively predicted by using experiential formula of Cn = 4537 × exp (−1.58 × 104/T) × t0.67, while in the presence of diluent N2, it could be effectively predicted by using Voorhies formula modified with dilution ratio γ as C'n = 4537 × exp (−1.58 × 104/T − 0.52 × γ) × t0.67, which could be considered and used for reference in other pyrolysis process.