Production of alkylated aromatic hydrocarbons from methane

A technology of alkylation and alkylating agent, which is applied in the production of liquid hydrocarbon mixtures, condensation hydrocarbons with dehydrocarbons, organic chemistry, etc., and can solve problems such as uneconomic recovery

Inactive Publication Date: 2008-02-13
EXXONMOBIL CHEM PAT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In fact, some natural gas fields have such high CO2 levels th

Method used

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  • Production of alkylated aromatic hydrocarbons from methane
  • Production of alkylated aromatic hydrocarbons from methane
  • Production of alkylated aromatic hydrocarbons from methane

Examples

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Embodiment 1

[0177] In one embodiment of the first example of the invention shown in Figure 1, the feed 11 is a natural gas stream containing 30.5 wt% carbon dioxide. Reactor 14 contained a Cu / Zn catalyst and was operated at a temperature of about 300°C and a pressure of 300 psia (2070 kPa). Reductive coupling reactor 13 contained MoZSM-5 catalyst and was operated at a temperature of about 900°C and a pressure of 50 kPa. The aromatic product separated by fractionation column 24 contained 90 wt% benzene and 10 wt% naphthalene-containing heavy fraction.

[0178] 100kg of benzene and 92kg of synthesis gas (by 81kg CO, 11kg H 2 composition) are combined and fed to an alkylation reactor containing supported Cr mixed with a silicon-selective PZSM-5 catalyst 2 o 3 / ZnO catalyst, and operate at a temperature of about 500°C and a pressure of 400 psia (2760 kPa). Separation of the alkylation effluent to remove C 8 The product stream will then be depleted in C 8 The effluent is divided into ben...

Embodiment 2

[0180] Repeat Example 1, except that the benzene generated in 100kg reductive coupling reactor 13 is mixed with 106kg methanol and 1kg H 2 combined and fed into an alkylation reactor containing a silicon-selected PZSM-5 catalyst, and at a temperature of about 501 °C and a pressure of 11 psig (177 kPa) for 3.9 hr -1 run at a WHSV of 1.8 and a hydrogen / hydrocarbon molar ratio. Separation of the alkylation effluent to remove C 8 The product stream will then be depleted in C 8 The effluent is divided into benzene, toluene and (heavy C 8 +) stream, and containing 58kg water and 10.3kg C 5 - Lightweight material flow. Again, C can be separated from the light stream 5 - components and recycled to reduction coupling reactor 13.

Embodiment 3

[0182] In one embodiment of the second example of the invention shown in FIG. 2 , feed 11 is a natural gas stream containing 25 wt. % carbon dioxide and is fed to reverse shift reactor 32 only. The reactor 32 contains a Ni catalyst on titania and operates at a temperature of about 900°C and a pressure of 400 psia (2,760 kPa). Alkylation reactor 13 contains supported Cr mixed with silicon-selective PZSM-5 catalyst 2 o 3 / ZnO catalyst, and operate at a temperature of about 500°C and a pressure of 400 psia (2760 kPa). The resulting aromatic product contained 38 wt% benzene, 10 wt% naphthalene, 48 wt% p-xylene and 4 wt% mixed xylenes.

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Abstract

In a process for converting methane to alkylated aromatic hydrocarbons, a feed containing methane is contacted with a dehydrocyclization catalyst under conditions effective to convert said methane to aromatic hydrocarbons and produce a first effluent stream comprising aromatic hydrocarbons and hydrogen. At least a portion of said aromatic hydrocarbon from said first effluent stream is then contacted with an alkylating agent under conditions effective to alkylate said aromatic hydrocarbon and produce an alkylated aromatic hydrocarbon having more alkyl side chains than said aromatic hydrocarbon prior to the alkylating.

Description

technical field [0001] The present application describes a process for the production of aromatics from methane, in particular from natural gas. Background technique [0002] Aromatics, especially benzene, toluene, ethylbenzene and xylenes, are important everyday chemicals in the petrochemical industry. Currently, aromatics are most commonly produced from petroleum-based feedstocks by a variety of methods, including catalytic reforming and catalytic cracking. However, as the world supply of petroleum feedstocks decreases, the need to find alternative sources of aromatics is growing. [0003] One possible alternative source of aromatics is methane, a major component of natural gas and biogas. World reserves of natural gas are constantly increasing and more natural gas than oil is currently discovered. Most of the natural gas produced with oil is flared and wasted, especially in remote areas, due to problems associated with transporting large volumes of natural gas. The di...

Claims

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Application Information

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IPC IPC(8): C07C2/76C07C2/66C10G50/00
CPCC07C2/66C07C2/76Y10S585/943C07C15/02
Inventor L·L·伊艾希诺E·L·斯塔文斯G·D·莫尔M·J·温森特
Owner EXXONMOBIL CHEM PAT INC
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