PATENT CLAIM ANALYSIS

Application Number: 16069262
Application Type: Utility
Filing Date: 2018-07
Publication Date: 2019-01
Patent Classification: ["518", "717000"]

Abstract:
A method for carbon dioxide direct hydrogenation to gasoline-range hydrocarbons is provided in this invention. Under the reaction conditions of 250-450° C., 0.01-10.0 MPa, 500-50000 mL/(h·g cat ) of feedstocks, 0.5-8 molar ratio of H 2  to CO 2 , the mixture of carbon dioxide and hydrogen may be directly converted to gasoline-range hydrocarbons over a multifunctional hybrid catalyst. The multifunctional hybrid catalyst comprises: iron-based catalyst for carbon dioxide hydrogenation as the first component, one, two or more of zeolites optionally modified by metal as the second component. In this method, a per-pass conversion of CO 2  may achieve more than 33%, the methane selectivity in the hydrocarbon products is less than 8%, the selectivity of gasoline-range hydrocarbons with carbon numbers from 5 to 11 in the hydrocarbon products is more than 70%. The obtained gasoline-range hydrocarbons exhibit high octane number due to its composition comprising isoparaffins and aromatics as the major components.

Claim (Index 5):
The method according to  claim 1  comprising:\n making the iron-based catalyst components for CO 2  hydrogenation by one of the following three preparation methods: \n A. one-pot synthesis method, comprising the following steps:\n (1) according to the catalyst composition, a soluble Fe(II) salt and a soluble Fe(III) salt are mixed and dissolved to form a salt solution-I; or the soluble Fe(II) salt, the Fe(III) salt, and a soluble promoter salt are mixed and dissolved to form a salt solution-II; wherein in the salt solution-I or salt solution-II, the concentration of Fe(III) is 0.05-1 mol/L, then a HCl solution with 5-12.1 mol/L HCl concentration is added into the salt solution-I or solution-II to adjust the pH value to 0-3, the molar ratio of Fe(III) to Fe(II) in the salt solutions-I and II is 2:(1\u02dc3); the soluble Fe(II) salt and Fe(II) salt are salt compounds that is dissolvable in water; the soluble promoter salt is a salt compound that is dissolvable in water; \n (2) an alkali solution is added dropwise into the salt solution I or salt solution II obtained from step (1) for titration to adjust the pH from 0-3 to 9-12; after finishing the titration, the solution is aged for 1-5 hours; wherein the alkali solution is an alkaline solution that is capable of adjusting the pH value of the salt solution I or salt solution II; the concentration of the alkali solution is 0.1-10 mol/L; in RCOOK and RCOONa, R is an organic group selected from the group consisting of C 1 -C 20  alkyl group, C 1 -C 20  alkenyl group and C 6 -C 20  aryl group; \n (3) separating precipitates from the solution obtained in step (2) by magnetic adsorption, centrifugation or suction filtration, and then fully washing the precipitates with distilled water, drying, and optionally calcining at 200-600\u00b0 C. for 2-10 hours to obtain the iron-based catalyst; \n \n B. one-pot synthesis method, comprising the following steps:\n (1) according to the catalyst composition, a soluble Fe(II) salt and a soluble Fe(III) salt are mixed and dissolved to form a salt solution, wherein in the salt solution, the concentration of Fe(III) is 0.05-1 mol/L, a HCl solution with 5-12.1 mol/L HCl concentration is added into the salt solution to adjust the pH value to 0-3; the molar ratio of Fe(III) to Fe(II) in the salt solution is 2:(1\u02dc3); \n (2) the alkali solution described in method A is added dropwise into the salt solution obtained from step (1) for titration to adjust pH value of the salt solution from 0-3 to 9-12; then the titrated solution is aged for 1-5 hours; \n (3) after reaction in (2), precipitates are separated from the solution obtained in (2) by magnetic adsorption, centrifugation or suction filtration, and then fully washed with distilled water, which is capable of controlling the content of residue Na or K by controlling the times and water usage of washing; and then the washed precipitates are dried, optionally calcined at 200-600\u00b0 C. for 2-10 hours to obtain the iron-based catalyst with promoter Na or K; \n \n C. first synthesis of Fe 3 O 4  by coprecipitation, and then addition of promoter by impregnation:\n (1) according to the catalyst composition, a soluble Fe(II) salt and a Fe(III) salt are mixed and dissolved to form a salt solution, wherein in the salt solution, the concentration of Fe(III) is 0.05-1 mol/L, a HCl solution with 5-12.1 mol/L HCl concentration is added into the salt solution to adjust the pH value to 0-3; the molar ratio of Fe(III) to Fe(II) in the salt solution is 2:(1\u02dc3); \n (2) the alkali solution described in method A is added dropwise into the salt solution obtained from step (1) for titration to adjust pH value of the salt solution from 0-3 to 9-12; after finishing the titration, the salt solution is aged for 1-5 hours; \n (3) after reaction in (2), precipitates are separated from the salt solutions by magnetic adsorption, centrifugation or suction filtration, and fully washed with distilled water, dried to form active composition Fe 3 O 4 ; \n (4) catalyst synthesis from combination of active composition Fe 3 O 4  and promoter salt by impregnation via a procedure as described below: according to the needed promoter content, the mass of promoter salt is calculated, and then the solution of a promoter salt is prepared, and Fe 3 O 4  as prepared is impregnated with the promoter salt solution by equivalent-volume impregnation, after stirring, stewing, drying, calcination at 200-600\u00b0 C. for 2-10 h, the iron-based catalyst with the promoter is obtained.

Metadata:
- Claim Count in Document: 20.0
- Percentile: 95.0
- Lexical Diversity: 1.72
- Patent Class: 518.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['16085397', '14351920', '10511390', '13140240', '13504929']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.6570762992815559
- 35 USC 102 Novelty (BERT): 0.5422253439015765
- Combined Prediction Score: 0.6455912037435579
- Mean Citation Score: 242.49271600000003
- Max Citation Score: 302.24277
- Similarity Product: 263.3112425739473

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

Dataset: test