PATENT CLAIM ANALYSIS

Application Number: 16343679
Application Type: Utility
Filing Date: 2019-04
Publication Date: 2019-08
Patent Classification: ["208", "211000"]

Abstract:
The present invention provides a catalytic gasoline desulfurization method having also an olefin selective removal function, which comprises: when a catalytic gasoline is pre-hydrotreated, cutting into a light fraction, a middle fraction and a heavy fraction; performing liquid-liquid extraction desulfurization treatment on the middle fraction to produce a sulfur-poor oil and a rich solvent containing sulfur-rich oil; the light fraction back-extracting the rich solvent, using C5 olefin therein to replace a macromolecular acyclic olefin in the sulfur-rich oil, so as to gather together C5 iso-olefins, cycloolefins, aromatic hydrocarbons and sulfides in the sulfur-rich oil; performing hydrogenation, olefin-reduction and desulfurization treatment on the heavy fraction together with the sulfur-rich oil removed from the back-extracted rich solvent to saturate the olefin therein; and finally, preparing together with the sulfur-poor oil to produce a full range gasoline. The sulfur-content of the catalytic gasoline produced by the method of the present invention can be reduced to 10 ppm or less, the olefin content of the catalytic gasoline can be reduced to 22%, the olefin is saturated by up to 8 percentage, and the RON loss of the full range gasoline is 1.5 or less, so that while reducing the olefin content of the catalytic gasoline, it ensures the less octane number loss, thereby satisfying the olefin-reduction requirements upgraded in the gasoline National VI Standard for ethanol-gasoline supply area enterprises.

Claim (Index 1):
A catalytic gasoline desulfurization method having also an olefin selective removal function comprising the following steps:\n 1) Pre-hydrotreating a catalytic gasoline, and cutting it into a light fraction having a sulfur content of less than 10 ppm and mainly composed of a C5 fraction, a middle fraction mainly composed of a C6-C9 fraction, and a heavy fraction. 2) Performing liquid-liquid extraction desulfurization treatment on the middle fraction obtained in the step 1) using a desulfurization solvent, to produce a sulfur-poor oil with a sulfur content of less than 10 ppm and a sulfur-rich oil in which macromolecular acyclic olefins, aromatic hydrocarbons and sulfides dissolved in the desulfurization solvent; 3) Back-extracting the rich solvent obtained in the step 2) using part of or all the light fraction obtained in the step 1), that is, using C5 olefin in the light fraction to replace a macromolecular acyclic olefin in the sulfur-rich oil, so as to dissolve the C5 iso-olefins, cycloolefins, aromatic hydrocarbon and sulfides in the rich solvent together; and; performing hydrogenation, olefin-reduction and desulfurization treatment on the heavy fraction together with the sulfur-rich oil removed from the back-extracted rich solvent to saturate the olefin therein; and finally, preparing together with the sulfur-poor oil to produce a full range gasoline 4) Separating the sulfur-rich oil from the back-extracted rich solvent in the step 3), then performing hydrogenation, olefin-reduction and desulfurization treatment on the heavy fraction obtained in step 1) together with the sulfur-rich oil so as to reduce the sulfur-content to less than 10 ppm and to make the olefin be saturated as more as possible; and finally, preparing together with the reminder of the light fraction obtained in the step 1) and the sulfur-poor oil obtained in the step 2) to produce a full range gasoline.

Metadata:
- Claim Count in Document: 3.0
- Percentile: 100.0
- Lexical Diversity: 2.17544
- Patent Class: 208.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['14684196', '14940027', '14929247', '10095295', '14931690']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7090070755419353
- 35 USC 102 Novelty (BERT): 0.5733944691942565
- Combined Prediction Score: 0.6954458149071674
- Mean Citation Score: 329.010632
- Max Citation Score: 426.90808
- Similarity Product: 348.2263230734968

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 1
- Claim Label 112: 0
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test