The Influence of Dimethyl Disulfide on Naphtha Steam Cracking

Abstract

A pilot unit for steam cracking equipped with a transfer line heat exchanger (TLE) that allows for the study of coke deposition in both the reactor and the TLE is presented. The reactor and TLE are made of Incoloy 800HT. The duration of a coking run typically amounts to 32.4 ks. The influence of different dimethyl disulfide (DMDS) addition procedures, i.e., continuous addition, presulfidation and presulfidation followed by continuous addition, on CO production and on coke deposition in the reactor and in the TLE during naphtha cracking is investigated. Presulfidation reduces CO production. However, to obtain a low and stable CO production, continuous addition of sulfur is required. The influence of sulfur addition on coke formation in the reactor can strongly differ from its influence on coke formation in the TLE. In the reactor, as well as in the TLE, the observed influence of sulfur addition is complex and strongly depends on the technique used. The optimal operating conditions for reducing CO production and minimizing coke formation consist of presulfidation followed by continuous dosing.

First principle‐based simulation of ethane steam cracking

“…To verify if the reaction network with ab initio thermodynamics and kinetics allows to obtain accurate simulation results without adjusting kinetic or thermodynamic parameters, a set of pilot plant experiments is simulated. This experimental pilot plant setup at the Laboratory for Chemical Technology allows fundamental studies of the kinetics of the cracking reactions73 as well as of practical issues such as coke deposition in both the radiant coil74 and the transfer line exchanger (TLE) 75…”

Challenges of Modeling Steam Cracking of Heavy Feedstocks

“…The latter allows measurement of the kinetics of the cracking reactions (Van Geem et al, 2005) and of the coke deposition in both the radiant coil (Reyniers and Froment, 1995) and the transfer line exchanger [TLE] (Dhuyvetter et al, 2001). The pilot plant set-up consists of 3 parts: a feed section, the furnace containing the suspended reactor coil and the analysis section.…”

Anti-coking property of the SiO2/S coating during light naphtha steam cracking in a pilot plant setup

“…However, catalytic coking caused by nickel and iron particles or their oxides is one of the main coking reasons for hydrocarbon thermal cracking [1]. Some methods, such as adding inhibitor to feedstock [2][3][4][5], increasing steam dilution of feedstock [6], catalyzing gasification of coke [7] have been extensively studied to alleviate coking. However, the online coating technology, by which the anti-coking coating is deposited after decoking, is a promising * Corresponding author.…”