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Methane conversion process

A methane conversion technology, applied in the integrated field of production of liquefied natural gas and/or pipeline gas, can solve the problems of high investment and energy costs and low efficiency of synthesis gas

Active Publication Date: 2013-07-24
EXXONMOBIL CHEM PAT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] However, despite the claimed efficiencies associated with the integration of the two processes (natural gas liquefaction and liquid hydrocarbon synthesis), the method of the '618 patent is inherently inefficient for at least two reasons, one being the liquefaction effluent stream and the The large pressure difference between the preferred operating pressures for hydrocarbon synthesis, and another reason for the large investment and energy costs of producing synthesis gas as an intermediate step in the production of liquid hydrocarbons

Method used

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Embodiment 1

[0119] By blending ZSM-5 and MoO with a molar ratio of silica to alumina of 25:1 3 , and then the resulting blend was calcined at 500 °C for 5 h in air to prepare a 2.7 wt% Mo / ZSM-5 catalyst.

[0120] The catalyst was then heated to 800 °C in helium, after which it was sufficient to obtain 4 hr -1 The 95% methane / 5% argon feedstock supplied at the WHSV rate replaces helium. Benzene production was measured over a 60-minute continuous on-time period, and at Figure 4 The results are shown in .

[0121] Repeat the above experiment, but use the volume containing 100ppm H 2 S 95% methane / 5% argon feedstock. Benzene production was again measured over the 60 min continuous on-time period, and at Figure 4 The results are shown in . Surprisingly, it was found that the presence of 100 ppm by volume of H2S had no significant effect on the yield of benzene.

Embodiment 2

[0123] Repeat the procedure of Example 1, but before heating to 800°C in helium, pass through 15% CH 4 / 85%H 2 The mixture was heated to 650 °C to pre-carburize the 2.7wt% Mo / ZSM-5 catalyst. In one test, the precarburized mixture also contained 100 ppm volume H 2 S, while in another test, the precarburized mixture contained only CH 4 and H 2 . Figure 5 The results are shown in , and show that when the H 2 MoO in the presence of S 3 During precarburization, the yield of benzene decreased slightly.

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Abstract

A process for converting a gaseous hydrocarbon feed comprising methane to an aromatic hydrocarbon is integrated with liquefied natural gas (LNG) and / or pipeline gas production. In the integrated process, the gaseous hydrocarbon feed is supplied to a conversion zone comprising at least one dehydroaromatization catalyst and is contacted with the catalyst under conversion conditions to produce a gaseous effluent stream comprising at least one aromatic compound, unreacted methane and H2. The gaseous effluent stream is then separated into a first product stream comprising said at least one aromatic compound and a second product stream comprising unreacted methane and H2. The second product stream is further separated into a methane-rich stream and a hydrogen-rich stream and at least part of the methane-rich stream is passed to LNG and / or pipeline gas production. The gaseous hydrocarbon feed supplied to the conversion zone has at least one of the following properties: (i) a sulfur level of at least 25 ppm by volume; (ii) a C02 level of at least 50 ppm by volume; and (iii) a dew point of at least 203 DEG K.

Description

[0001] priority claim [0002] This application claims the benefit of US Provisional Application No. 61 / 372,160, filed August 10, 2010, which is hereby incorporated by reference in its entirety. field of invention [0003] The present invention relates to a process for the conversion of methane to aromatics, and in particular to the integration of this process with the production of liquefied natural gas (LNG) and / or pipeline gas. The term "pipeline" gas as used herein refers to any natural gas used for fuel or as a chemical feedstock, where the gas is obtained in the gas phase at the pressure and temperature required for use or transport. Background technique [0004] Aromatics, especially benzene, toluene, ethylbenzene and xylenes, are important commercial chemicals in the petrochemical industry. Currently, aromatics are most commonly produced from petroleum-based feedstocks by various methods, including catalytic reforming and catalytic cracking. However, as the world s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C2/84C07C2/86C07C15/08C10L3/06
CPCF25J3/0209F25J3/0223F25J3/0252C07C2/76F25J2215/04F25J2270/904F25J3/0233F25J2210/62C07C2529/69C10L3/08Y02P20/10C07C15/04C07C15/24
Inventor L·L·亚西诺R·D·丹顿G·M·诺曼J·R·拉特纳
Owner EXXONMOBIL CHEM PAT INC