Process for producing gasoline having lower benzene content and distillation end point
First Claim
1. A process for the production of gasoline having reduced benzene content and lower boiling end point, comprising:
- a) introducing reformer effluent into a fractionation system for separation and recovery of an overhead stream comprising C5 - hydrocarbons, a bottom stream comprising C9 + alkylaromatic and non-aromatic hydrocarbons, a stream comprising benzene rich C6 hydrocarbons, and a stream comprising C7 -C8 hydrocarbons;
b) passing said benzene rich C6 stream and a portion of said C9 + hydrocarbon stream to a hydrocarbon cracking and alkylation reactor containing acidic shape selective metallo-silicate catalyst particles under cracking, alkylation and transalkylation conversion conditions whereby a portion of said benzene is converted to C7 + alkylaromatics and a portion of said C9 + hydrocarbons is converted to lower molecular weight hydrocarbons;
c) recycling effluent from said reactor to said fractionation tower to separate and recycle unconverted benzene and unconverted C9 + hydrocarbons whereby the production of C7 -C9 alkylaromatics is maximized.
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Abstract
A process is disclosed for upgrading reformate and/or light FCC gasoline by substantially reducing the amount of benzene in the gasoline product while simultaneously reducing the gasoline ASTM distillation End Point. The process comprises the fractionation of reformate to recover that fraction, C7 -C8 hydrocarbons, directly useful in gasoline without further conversion. A heavy bottom fraction comprising C9 + aromatic and non-aromatic hydrocarbons is recovered and a C6 fraction rich in benzene. The total C6 fraction and a portion of the C9 + fraction are converted by alkylation, transalkylation and cracking in contact with acidic metallosilicate catalyst particles to gasoline boiling range materials rich in alkylaromatics. Following debutanization or depentanization of the conversion product, the fraction containing unconverted benzene is recycled to the reformate fractionator.
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Citations
19 Claims
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1. A process for the production of gasoline having reduced benzene content and lower boiling end point, comprising:
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a) introducing reformer effluent into a fractionation system for separation and recovery of an overhead stream comprising C5 - hydrocarbons, a bottom stream comprising C9 + alkylaromatic and non-aromatic hydrocarbons, a stream comprising benzene rich C6 hydrocarbons, and a stream comprising C7 -C8 hydrocarbons; b) passing said benzene rich C6 stream and a portion of said C9 + hydrocarbon stream to a hydrocarbon cracking and alkylation reactor containing acidic shape selective metallo-silicate catalyst particles under cracking, alkylation and transalkylation conversion conditions whereby a portion of said benzene is converted to C7 + alkylaromatics and a portion of said C9 + hydrocarbons is converted to lower molecular weight hydrocarbons; c) recycling effluent from said reactor to said fractionation tower to separate and recycle unconverted benzene and unconverted C9 + hydrocarbons whereby the production of C7 -C9 alkylaromatics is maximized. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A process for the combined upgrading of reformate and light C5 + olefinic gasoline to provide low boiling end point gasoline having reduced benzene and olefins content, comprising:
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a) introducing reformer effluent into a fractionation tower for separation and recovery of an overhead stream comprising C6 - hydrocarbons, a bottom stream comprising C9 + alkylaromatic and non-aromatic hydrocarbons , a stream comprising benzene rich C6 hydrocarbons, and a stream comprising C7 -C8 hydrocarbons; b) passing said benzene rich C6 stream, a portion of said C9 + hydrocarbon stream and a feedstream comprising C5 + light olefinic gasoline to a hydrocarbon cracking and alkylation reactor containing acidic shape selective metallosilicate catalyst particles under cracking, alkylation and transalkylation conversion conditions whereby a portion of said benzene is converted to C7 + alkylaromatics, a portion of said C9 + hydrocarbons is converted to lower molecular weight hydrocarbons and olefins are lowered; c) recycling effluent from said reactor to said fractionation tower to separate and recycle unconverned benzene and unconverted C9 + hydrocarbons whereby the production of C7 -C9 alkylaromatics is maximized. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A process for the production of C5 + gasoline having reduced benzene content and lower boiling end point, comprising:
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(a) introducing a feedstream comprising C5 + gasoline boiling range olefinic hydrocarbons rich in benzene and C9 + alkylaromatic hydrocarbons into a hydrocarbon cracking and alkylation reactor containing acidic shape selective metallosilicate catalyst particles under cracking, alkylation and transalkylation conversion conditions whereby a portion of said benzene is converted to C7 + alkylaromatics and a portion of said C9 + hydrocarbons is converted to lower molecular weight hydrocarbons; (b) introducing effluent from said reactor into a fractionation system for separation and recovery of an overhead stream comprising C4 - or C5 - hydrocarbons, a bottom stream comprising C9 + alkylaromatic rich hydrocarbons, a stream comprising benzene rich C6 hydrocarbons, and a stream comprising C7 -C8 hydrocarbons; c) recycling a portion of said bottom stream and a portion of said fractionator C6 hydrocarbon stream to said reactor. - View Dependent Claims (16, 17, 18, 19)
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Specification