Method for producing a stream containing hydrocarbons for use as feed to a hydrogen plant having a methane reformer with steam

摘要

A method for producing a stream containing treated for use as a feed to a hydrogen plant having a methane reformer with steam hydrocarbons, said method comprising: contacting a feed stream containing hydrocarbons untreated composition Variable comprising hydrocarbons containing two or more carbon atoms including olefins, species of organic sulfur and hydrogen with a sulfur-tolerant catalyst present in a reaction step and can cause hydrogenation reactions and oxidation, wherein the current feed containing untreated residual hydrocarbons is a refining gas is compressed to a pressure greater than a stream of preheated natural gas produced in the hydrogen plant; converting a portion of the olefins in saturated hydrocarbons and part of the sulfur species to hydrogen sulfide in the reaction step, thereby producing a first intermediate stream, through hydrogenation reactions caused by the catalyst or introducing sufficient oxygen and water vapor in the reaction step so that the oxidation reactions are caused by the catalyst leading to saturated hydrocarbons, methane, additional hydrogen and carbon monoxide are produced from the hydrocarbons present in the stream hydrocarbon-containing feed untreated, combining the first intermediate stream with the preheated natural gas stream to produce a combined stream containing between 0.5 mole percent and 6 mole percent olefin dry basis and less than 25 ppm by volume of total sulfur dry basis; passing the first intermediate stream through a boiler to generate saturated steam for the hydrogen plant and is cooled in this way the first intermediate stream to a temperature between 260 and 480 ° C prior to combining with the preheated natural gas stream; and before introducing the feed stream containing hydrocarbons in the reaction phase, preheating the feed stream containing untreated oil, after compression, to a temperature of 230 ° C by indirect heat exchange with steam generated in the hydrogen plant; It is preheated in a feed preheater by indirect heat exchange with a stream of syngas produced in the plant of hydrogen at a temperature between 260 and 400 ° C; and then subjected to a pretreatment step configured to remove hydrogen sulfide from the incoming feed stream containing untreated hydrocarbons; introducing the combined stream into a hydrotreater having other catalyst is capable of causing only hydrogenation reactions and produce a second intermediate stream contains no more than 0.5 mole percent of the olefins in dry basis not more than 0, 1 vppm total sulfur dry basis, and having a greater amount of hydrogen sulfide the first intermediate stream and minor amounts of olefins and species of organic sulfur that the first intermediate stream by subjecting the remaining olefin and organic sulfur species of the first intermediate stream to hydrogenation reactions; and adsorbing hydrogen sulfide in the second intermediate stream, thus producing the treated stream containing hydrocarbons.