Methods for operating acetylene hydrogenation units in integrated steam cracking and fluidized catalytic dehydrogenation systems

A method for operating an acetylene hydrogenation unit in an integrated steam cracking-fluidized catalytic dehydrogenation (FCDh) system, the method comprising:

• cracking at least a portion of a first hydrocarbon feed in a steam cracking system to produce a cracked gas comprising at least hydrogen, carbon monoxide (CO), and acetylene;
• dehydrogenating at least a portion of a second hydrocarbon feed in an FCDh system to produce an FCDh effluent comprising at least hydrogen and CO;
• separating the cracked gas and at least a portion of the FCDh effluent into a hydrogenation feed and an acetylene-depleted stream, the hydrogenation feed comprising at least hydrogen, CO, and acetylene, wherein the hydrogenation feed comprises at least 95% of the CO from the cracked gas and the FCDh effluent, and wherein during normal operating conditions at least 20% of the CO in the hydrogenation feed is from the cracked gas, wherein during normal operating conditions, both the steam cracking system and the FCDh system are operating at high temperatures and steady state;
• contacting the hydrogenation feed with an acetylene hydrogenation catalyst in an acetylene hydrogenation unit, the contacting causing hydrogenation of at least a portion of the acetylene in the hydrogenation feed to produce a hydrogenated effluent;
• and
• operating the steam cracking system under conditions that produce a CO concentration in the hydrogenation feed of at least 100 ppmv when a flowrate of the FCDh effluent is zero.