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 4):
The method according to  claim 1  wherein, the liquid-liquid extraction desulfurization treatment on the middle fraction by using the desulfurization solvent stated in the step 2) is performed in a extracting desulfurization tower; said middle fraction is fed from the middle of the extracting desulfurization tower, said desulfurization solvent is injected from the top of the extracting desulfurization tower; the temperature at the top of the extracting desulfurization tower is controlled to be 85-150\u00b0 C., the temperature at the bottom of the extracting desulfurization tower is controlled to be 70-120\u00b0 C., the pressure (absolute pressure) at the top of the extracting desulfurization tower is controlled to be 0.2-0.7 MPa, the feed ratio of the desulfurization solvent to the middle fraction is controlled to be 1.0-5.0, said middle fraction is in multi-stage countercurrent contact with the desulfurization solvent in the upper part of the tower, and the sulfur-poor oil with a sulfur-content of less than 10 ppm obtained at the top of the extracting desulfurization tower is washed with water for recovering the solvent and then sent to the gasoline pool as a blending component for a reserve.

Metadata:
- Claim Count in Document: 3.0
- Percentile: 100.0
- Lexical Diversity: 2.17544
- Patent Class: 208.0
- Transitional Phrase Type: none
- Component Type: 0
- Foreign Priority: True
- Related Applications: ['14684196', '14940027', '14929247', '10095295', '14931690']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.734992922767914
- 35 USC 102 Novelty (BERT): 0.5709409394741598
- Combined Prediction Score: 0.7185877244385385
- Mean Citation Score: 329.010632
- Max Citation Score: 426.90808
- Similarity Product: 300.2302027437973

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