Patent EP0303438A2 successfully refreshed from Google Patents.
EP0303438A2
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EP
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Production of synthesis gas from hydrocarbonaceous feedstock
Assignee: Davy McKee Corp
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Filing: 1988-08-09
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Granted: —
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Expires: 2008-08-09
Abstract
Abstract Hydrocarbonaceous feedstocks are converted to synthesis gas by a catalytic partial oxidation process wherein a mixture of hydrocarbonaceous feedstock, oxygen or an oxygen-containing gas and, optionally, steam is provided to a catalytic partial oxidation zone at a temperature not lower than 93°C below its autoignition temperature and at an oxygen-to-carbon molar ratio from 0.3:1 to 0.8:1. The catalytic partial oxidation zone contains a catalyst having a geometric surface area-to-volume ratio of at least 5 cm²/cm³, preferably greater than 20 cm²/cm³. The catalyst volume requirements are comparatively low inasmuch as space velocities which are from about 20,000 hr.⁻¹ to 500,000 hr.⁻¹.
Inventors
- 👤 Michael Dunster
- 👤 Joseph D Korchnak
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 10:32
CPC Classifications
C; C01; C01B; C01B3/00; C01B3/02; C01B3/22; C01B3/24; B; B01; B01J; B01J8/00; B01J8/02; B01J8/0278; B01F; B01F25/00; B01F25/30; B01F25/31; B01F25/314; B01F25/3142; B01F25/31422; B01F25/3143; B01F25/31434; C01B3/32; C01B3/34; C01B3/38; C01B3/386; C01B3/40; B01J35/00; B01J35/50; B01J35/56; C01B2203/00; C01B2203/02; C01B2203/025; C01B2203/0261; C01B2203/10; C01B2203/1005; C01B2203/1011; C01B2203/1023; C01B2203/1041; C01B2203/1047; C01B2203/1052; C01B2203/1064; C01B2203/107; C01B2203/1082; C01B2203/12; C01B2203/1205; C01B2203/1211; C01B2203/1235; C01B2203/1241; C01B2203/1276; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
137 words
A process for producing synthesis gas from a hydrocarbonaceous feedstock by introducing to a catalytic partial oxidation zone an essentially completely mixed gaseous mixture of a hydrocarbonaceous feedstock, oxygen or an oxygen-containing gas and, optionally, steam; and partially oxidizing the hydrocarbonaceous feedstock in the catalytic partial oxidation zone to produce a gas consisting essentially of methane, carbon oxides, hydrogen and steam by passing the mixture through a catalyst capable of catalyzing the oxidation of the hydrocarbons; characterized in that the gaseous mixture has a steam-to-carbon molar ratio from 0:1 to 3.0:1, an oxygen-to-carbon molar ratio from 0.3:1 to 0.8:1, said mixture is introduced to the catalytic partial oxidation zone at a temperature not lower than 93°C below its autoignition temperature, and said catalyst has a ratio of geometric surface area to volume of at least 5 cm²/cm³.
Claim 2
Dependent Claim
137 words
A process for producing synthesis gas from a hydrocarbonaceous feedstock by introducing to a catalytic partial oxidation zone an essentially completely mixed gaseous mixture of a hydrocarbonaceous feedstock, oxygen or an oxygen-containing gas and, optionally, steam; and partially oxidizing the hydrocarbonaceous feedstock in the catalytic partial oxidation zone to produce a gas consisting essentially of methane, carbon oxides, hydrogen and steam by passing the mixture through a catalyst capable of catalyzing the oxidation of the hydrocarbons; characterized in that the gaseous mixture has a steam-to-carbon molar ratio from 0:1 to 3.0:1, an oxygen-to-carbon molar ratio from 0.3:1 to 0.8:1, said mixture is introduced to the catalytic partial oxidation zone at a temperature not lower than 93°C below its autoignition temperature, and said catalyst has a ratio of geometric surface area to volume of at least 5 cm²/cm³.
Claim 3
Dependent Claim
28 words
A process as claimed in claim 1, characterized in that the gaseous reaction mixture passes through the catalyst with a space velocity from 20,000 hr⁻¹ to 500,000 hr⁻¹.
Claim 4
Dependent Claim
32 words
A process as claimed in claim 1 or claim 2, characterized in that the mixture is introduced into the partial oxidation zone at a temperature at least equal to its autoignition temperature.
Claim 5
Dependent Claim
28 words
A process as claimed in any one of claims 1 to 3, characterized in that the steam-to-carbon molar ratio in the gaseous mixture is from 0.3:1 to 2.0:1.
Claim 6
Dependent Claim
24 words
A process as claimed in any one of claims 1 to 4, characterized in that the oxygen-to-carbon molar ratio is from 0.45:1 to 0.65:1.
Claim 7
Dependent Claim
31 words
A process as claimed in any one of claims 1 to 5, characterized in that the catalyst has a geometric surface area to volume ratio from 20 cm²/cm³ to 40 cm²/cm³.
Claim 8
Dependent Claim
35 words
A process as claimed in any one of claims 1 to 6, characterized in that the temperature of the gaseous mixture at the inlet to the catalytic partial oxidation zone is from 340°C to 650°C.
Claim 9
Dependent Claim
88 words
A process as claimed in any one of claims 1 to 7, characterized in that the hydrocarbonaceous feedstock and steam are first admixed and heated to a temperature from 340°C to 650°C; and the resulting mixture is admixed with oxygen or oxygen-containing gas which has been heated to a temperature from 65°C to 650°C, thereby producing a mixture which will undergo autoignition; and introducing the mixture with oxygen to the inlet of the catalytic partial oxidation zone before the autoignition delay time of the mixture with oxygen elapses.
Claim 10
Dependent Claim
42 words
A process as claimed in any one of claims 1 to 8, characterized in that the catalyst comprises at least one monolithic structure having a honeycome cross-section, said structure comprising alumina, spinel, zirconia spinel, mullite aluminum titanate, mullite, Mn/MgO cordierite or cordierite.
Claim 11
Dependent Claim
20 words
A process as claimed in any one of claims 1 to 8, characterized in that said catalyst comprises wire mesh.
Claim 12
Dependent Claim
45 words
A process as claimed in any one of claims 1 to 8, characterized in that said catalyst comprises a structure substrate coated with a material selected from the group consisting of platinum, rhodium, irridium, osmium, ruthenium, palladium, nickel, chromium, cobalt, cerium, lanthanum and mixtures thereof.
Claim 13
Dependent Claim
28 words
A process as claimed in any one of claims 1 to 11, characterized in that the reaction temperature of the catalytic partial oxidation is from 760°C to 1090°C.
Claim 14
Dependent Claim
28 words
A process as claimed in any one of claims 1 to 12, characterized in that the pressure in the catalytic partial oxidation zone is greater than 690 KPa.
Claim 15
Dependent Claim
28 words
A process as claimed in any one of claims 1 to 13, characterized in that the pressure in the catalytic partial oxidation zone is greater than 1724 KPa.
Claim 16
Dependent Claim
31 words
A process as claimed in any one of claims 1 to 14, characterized in that the catalytic partial oxidation reaction is carried out in the essential absence of steam reforming reactions.
Claim 17
Dependent Claim
25 words
A process as claimed in claim 15, characterized in that the catalyst in the partial oxidation zone has essentially no catalytic activity for steam reforming.
Claim 18
Dependent Claim
22 words
A process as claimed in claim 15 or claim 16, characterized in that the hydrocarbon slippage is not greater than about 2%.
Claim 19
Dependent Claim
153 words
A process as claimed in any one of claims 1 to 17, characterized in that the hydrocarbonaceous feedstock is natural gas, the natural gas is mixed with steam in a steam-to-carbon molar ratio in the range from 0.3:1 to 2.0:1, the natural gas and steam are heated to a temperature in the range from 340°C to 650°C, the resulting mixture of natural gas and steam is admixed with oxygen or oxygen-containing gas which has been heated to a temperature from 65°C to 650°C, the mixture of natural gas, steam and oxygen are introduced to a catalytic partial oxidation zone before autoignition time delay elapses, the gaseous mixture passes through the catalyst with a space velocity from 20,000 hr⁻¹ to 500,000 hr⁻¹, and the gaseous mixture undergoes catalytic partial oxidation at a temperature in the range from 760°C to 1090°C to produce a synthesis gas consisting essentially of hydrogen, carbon oxides, steam and methane.
Claim 20
Dependent Claim
22 words
A process as claimed in claim 18, characterized in that the synthesis gas contains no more than 2% of unreacted natural gas.
Claim 21
Dependent Claim
57 words
A process as claimed in claim 18 or claim 19, characterized in that the partial oxidizing is performed at a temperature which is equal to or greater than a linear function of the steam-to-carbon molar ratio including the range from 1040°C for a steam-to-carbon molar ratio of 0:1 to 870°C for a steam-to-carbon molar ratio of 0.4:1.
References Cited (Backward Citations)
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