Source of the gas produced as a by-product in continuous reforming units
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I would like to ask: in a continuous reforming unit, is the by-product gas the light components obtained after the pre-hydrogenation of naphtha feedstock, or are they the light components at the top of the reforming product separation tower?
The dry gas generated as a by-product of side reactions during the reforming process is usually sent to the fuel gas pipeline
One is the sulfur-containing fuel gas from the top of the stripping column reflux tank, and the other is the sulfur-free fuel gas from the top of the C4C5 separation column reflux tank； Even the PSA desorbed gas is included in the fuel gas official website’s data
Generally, fuel gas must be desulfurized before use.
Is there a distillation process to separate the light components before pre-hydrogenation enters the reforming reactor?
The reforming reaction process itself also involves minor cracking and dealkylation side reactions, resulting in low-carbon hydrocarbon gas by-products.
The pre-hydrogenation stripping tower produces sulfur-containing dry gas, while the reforming stabilization tower or the butane removal tower produces stabilized dry gas.
For C5 content, one control at level 3 and one control at level 2
This post was last edited by bhdjj on 2018-12-20 at 16:06. Reformed gas products generally consist of two parts. One type is fuel gas, which is the gas obtained by pressurizing the hydrogen from the reforming process, performing recontact, carrying out low-temperature cooling and separation, and then pressurizing the exhaust gas after PSA separation. It mainly originates from the hydrogenolysis of alkanes in the reforming feedstock. The hydrogenolysis reaction takes place at the metal centers of the reforming catalyst, with the breakdown of carbon chains at the molecule ends being the main process; methane is the primary gaseous product ； Another is the liquefied gas components; reformation is accompanied by side reactions of hydrocracking, which takes place at acidic sites and mainly involves breaks in the middle part of the molecules, with the gaseous products being primarily C3 and C4 compounds. The liquid phase portion of the reformation reaction’s recycle stream is separated at the top of the stabilizer tower to be produced. The pre-hydrogenation light gas, the sulfur-containing gases from the hydrogen sulfide removal tower, and the sulfur-containing liquefied gas are all products of the pre-hydrogenation stage; they originate mainly from two sources: first, the liquefied gas that comes from upstream or externally sourced straight-run naphtha without going through a stabilization unit, and second, the side reactions that occur during naphtha hydrocracking, primarily involving C3 and C4 compounds.
The sulfur content in the feed for the reformation reaction is very low, generally less than 5PPM. Sulfur is added during normal production, but in small quantities, mainly to prevent coking on the filter screens of the reactor walls
There are mainly two approaches: pre-fractionation followed by re-stripping, or stripping first and then fractionation