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 8):
The method according to  claim 1  comprising the following continuous processes:\n (1) Pre-hydrotreating the catalytic gasoline: it adopts the liquid phase hydrogenation using cobalt molybdenum as an active catalyst, the operating pressure is 1.0-3.0 MPa, the temperature is 100-200\u00b0 C., the hydrogen-oil ratio is 3-10, and the space velocity is 1-3 h \u22121 . \n (2) The pre-hydrotreated catalytic gasoline in the step (1) enters a fractionation tower for cutting the light gasoline, which is named \u201clight fraction cutting tower\u201d, the light gasoline mainly composed of the C5 fraction is cut at a cutting point of 40\u00b0 C., the light gasoline is discharged from the top of the light fraction cutting tower, while the residual fraction is discharged from the bottom of the light fraction cutting tower and enters another fractionation tower for cutting the middle gasoline, which is named \u201cmiddle fraction cutting tower\u201d; \n (3) The middle gasoline mainly composed of C6-C9 fractions is cut at a cutting point of 150\u00b0 C. in the middle fraction cutting tower, the middle gasoline is discharged from the top of the middle fraction cutting tower, and the heavy gasoline is discharged from the bottom of the middle fraction cutting tower; \n (4) The middle gasoline discharged from the top of the middle fraction cutting tower in the step (3) enters the middle part of a extracting desulfurization tower, all or part of the light gasoline discharged from the top of the light fraction cutting tower in the step (2) enters the lower part of the extracting desulfurization tower; and the desulfurization solvent is injected from the top of the extracting desulfurization tower. \n The operation conditions of the extracting desulfurization tower are that: the temperature at the top of the tower is 85-150\u00b0 C., the temperature at the bottom of the tower is 70-120\u00b0 C.; the pressure (absolute pressure) at the top of the tower is 0.2-0.7 MPa; the feed ratio of the desulfurization solvent to the middle gasoline is controlled to be 1.0-5.0; and the feed ratio of the light gasoline to the middle gasoline is controlled to be 0.1-0.5. \n The middle gasoline after being desulfurized is sent out from the top of the extracting desulfurization tower, washed with water for recycling the solvent, and then sent to the gasoline pool as a blending component; and the desulfurization solvent concentrated with small molecular iso-olefins, cycloolefins, aromatic hydrocarbons and sulfides is sent into a deoiling tower from the bottom of the extracting desulfurization tower. \n (5) In the deoiling tower, the pressure (absolute pressure) at the top of the tower is controlled to be 0.015-0.07 MPa, and the temperature at the bottom of the tower is controlled to be 130-175\u00b0 C.; the desulfurization solvent is purified by vacuuming distillation and stripping distillation; the sulfur-rich oil is distilled off at the top of the tower; and the extracted and deoiled desulfurization solvent at the bottom of the deoiling tower is returned into the top of the extracting desulfurization tower described in the step (4) for recycling use. \n (6) The sulfur-rich oil distilled from the deoiling tower in the step (5) together with the heavy gasoline discharged from the bottom of the middle fraction cutting tower in the step (3) are sent to the hydrogenation apparatus for performing the highly active hydrogenation, in order to make the olefin therein be saturated, and to remove the sulfur to 10 ppm or less, then obtain the desulfurized and olefin-reduced fraction. \n (7) The full range gasoline with a sulfur-content of less than 10 ppm and a olefin content of less than 22% is prepared and obtained by the desulfurized and olefin-reduced fraction obtained in the hydrogenation apparatus in the step (6) together with the light gasoline obtained at the top of the light fraction cutting tower in the step (2) and the middle gasoline obtained at the top of the extracting desulfurization tower in the step (4).

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): 0.709711605645182
- 35 USC 102 Novelty (BERT): 0.5718864827531019
- Combined Prediction Score: 0.6959290933559741
- Mean Citation Score: 329.010632
- Max Citation Score: 426.90808
- Similarity Product: 332.8340383256245

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