A steam-hydrocarbon reforming process comprising: passing a feed stream to a first reactor containing a catalyst during a first period, reacting the feed stream in the first reactor in the presence of the catalyst under reaction conditions sufficient to react the feed stream and form an intermediate product stream, and withdrawing the intermediate product stream from the first reactor; wherein the feed stream comprises steam and hydrocarbons including C2+ hydrocarbons, wherein the concentration of the C2+ hydrocarbons in the feed stream varies during the first period; wherein the feed stream has a molar flow rate of hydrocarbons, F HC; and w herein the feed stream has a molar flow rate of steam, F S, thereby defining a ratio, F S / F HC, of the molar flow rate of steam to the molar flow rate of hydrocarbons in the feed stream; introducing a second reactor feed stream comprising at least a portion of the intermediate product stream into a second reactor, reacting the second reactor feed stream in the second reactor in the presence of a second catalyst under reaction conditions effective to form a reformate comprising H 2, CO, CH 4, and H 2 O, and withdrawing the reformate from the second reactor; characterized by dividing the intermediate product stream into a first portion and a second portion), the second portion of the intermediate product stream having a mass flow rate, M 1; introducing the second reactor feed stream comprising the first portion as the at least a portion of the intermediate product stream into the second reactor; conditioning the second portion by removing at least water and ammonia to form a conditioned portion of the second portion of the intermediate product stream; measuring a C2+ hydrocarbon content in the conditioned portion of the second portion of the intermediate product stream in a chemical component analyzer; increasing the ratio of the molar flow rate of steam to the molar flow rate of hydrocarbons in the feed stream responsive to the step of measuring the C2+ hydrocarbon content when the C2+ hydrocarbon content equals or exceeds an upper target C2+ hydrocarbon content during the first period; and decreasing the ratio of the molar flow rate of steam to the molar flow rate of hydrocarbons in the feed stream responsive to the step of measuring the C2+ hydrocarbon content when the C2+ hydrocarbon content equals or drops below a lower target C2+ hydrocarbon content during the first period. passing a feed stream to a first reactor containing a catalyst during a first period, reacting the feed stream in the first reactor in the presence of the catalyst under reaction conditions sufficient to react the feed stream and form an intermediate product stream, and withdrawing the intermediate product stream from the first reactor; wherein the feed stream comprises steam and hydrocarbons including C2+ hydrocarbons, wherein the concentration of the C2+ hydrocarbons in the feed stream varies during the first period; wherein the feed stream has a molar flow rate of hydrocarbons, F HC; and w herein the feed stream has a molar flow rate of steam, F S, thereby defining a ratio, F S / F HC, of the molar flow rate of steam to the molar flow rate of hydrocarbons in the feed stream; introducing a second reactor feed stream comprising at least a portion of the intermediate product stream into a second reactor, reacting the second reactor feed stream in the second reactor in the presence of a second catalyst under reaction conditions effective to form a reformate comprising H 2, CO, CH 4, and H 2 O, and withdrawing the reformate from the second reactor; characterized by dividing the intermediate product stream into a first portion and a second portion), the second portion of the intermediate product stream having a mass flow rate, M 1; introducing the second reactor feed stream comprising the first portion as the at least a portion of the intermediate product stream into the second reactor; conditioning the second portion by removing at least water and ammonia to form a conditioned portion of the second portion of the intermediate product stream; measuring a C2+ hydrocarbon content in the conditioned portion of the second portion of the intermediate product stream in a chemical component analyzer; increasing the ratio of the molar flow rate of steam to the molar flow rate of hydrocarbons in the feed stream responsive to the step of measuring the C2+ hydrocarbon content when the C2+ hydrocarbon content equals or exceeds an upper target C2+ hydrocarbon content during the first period; and decreasing the ratio of the molar flow rate of steam to the molar flow rate of hydrocarbons in the feed stream responsive to the step of measuring the C2+ hydrocarbon content when the C2+ hydrocarbon content equals or drops below a lower target C2+ hydrocarbon content during the first period.