초록 ▼

A process is disclosed for improving catalyst performance and yields in the manufacture of motor gasoline components. More particularly the process is directed to the removal of H2S, sulfur compounds, trace amounts of acetonitrile or acetone or propionitrile from a hydrocarbon feedstock, comprising

A process is disclosed for improving catalyst performance and yields in the manufacture of motor gasoline components. More particularly the process is directed to the removal of H2S, sulfur compounds, trace amounts of acetonitrile or acetone or propionitrile from a hydrocarbon feedstock, comprising a C3-C5 product fraction from a fluid catalytic cracking unit which may be used subsequently in an etherification process for the production of ethers such as MTBE and TAME and/or an alkylation process for the production of alkylate. The hydrocarbon feedstock is passed to an amine treating zone, a mercaptan sulfur removal zone and an adsorption zone for the removal of sulfur compounds, water and trace amounts of acetonitrile or acetone or propionitrile. The regeneration of the adsorption zone includes the contacting of the sorbent with a heated regenerant vapor stream. The spent regenerant vapor stream is condensed to provide a hydrocarbon phase and an aqueous phase. The trace amounts of the acetonitrile, acetone, and propionitrile are removed in the aqueous phase. The hydrocarbon phase is treated to remove sulfur compounds and can be recycled as the regenerant.

대표청구항 ▼

A process for the removal of sulfur compounds including H2S, COS and mercaptan sulfur compounds, and a trace amount of polar compounds comprising acetonitrile or acetone or propionitrile from a hydrocarbon feedstream comprising a C3-C5 product fraction from a fluid catalytic cracking unit comprising

A process for the removal of sulfur compounds including H2S, COS and mercaptan sulfur compounds, and a trace amount of polar compounds comprising acetonitrile or acetone or propionitrile from a hydrocarbon feedstream comprising a C3-C5 product fraction from a fluid catalytic cracking unit comprising the following steps: (a) contacting the hydrocarbon feedstream with an alkanolamine in an amine treating zone under H2S and COS absorption conditions to provide an H2S- and COS-depleted stream; (b) contacting the H2S- and COS-depleted stream with an alkaline scrubbing solution in a mercaptan absorption zone under mercaptan sulfur absorption conditions to produce a mercaptan-depleted stream; (c) contacting the mercaptan-depleted stream with a polar compound selective adsorbent in an adsorption zone comprising an adsorbent bed containing said adsorbent at adsorption conditions effective to adsorb the trace amount of polar compounds and to produce a treated product stream essentially free of acetonitrile, acetone, and propionitrile; (d) recovering the treated product stream; (e) contacting the polar compound selective adsorbent in said adsorbent bed with a heated regenerant vapor stream at regeneration conditions to desorb said polar compounds and to provide a spent regenerant vapor stream; (f) cooling and condensing the spent regenerant vapor stream to provide a hydrocarbon phase and an aqueous phase; (g) removing the aqueous phase comprising said polar compounds; and, (h) passing said hydrocarbon phase to an H2S removal zone to provide a treated hydrocarbon stream and admixing at least a portion of the treated hydrocarbon stream with the regenerant vapor stream.