Joint process for preparing ethylene and synthesis gas by direct conversion of methane

A technology for synthesis gas and methane, which is applied in the chemical industry, sustainable manufacturing/processing, inorganic chemistry, etc., and can solve the problems of complex processes, high manufacturing costs, and large CO2 emissions.

Inactive Publication Date: 2011-06-15
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such as the method provided by U.S. Patent 4810472, 6525104, the above-mentioned method ha

Method used

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  • Joint process for preparing ethylene and synthesis gas by direct conversion of methane

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Embodiment 1

[0021] Use as attached figure 1 Shown technological process, in methane oxidative coupling OCM reactor, charge 20g Mn(2%)-Na 2 WO 4 (5%) / SiO2 2 Catalyst, loaded with 15g 9%Ni / 5%Ce / θ-Al in the reforming reactor 2 o 3 catalyst. The two reactors were heated to 800 °C and 750 °C by an external heating furnace, respectively, with 5% H 2 / N 2 After reducing the Ni catalyst for 5 h, in N 2 Continue heating to 800°C; methane 1 and O 2 2 Pass through the mass flow controller respectively, pass through the mixer at the flow rate of 8000ml / min and 2000ml / min, and enter the oxidative coupling reactor A after preheating at 400°C, and the reacted gas stream 3 is cooled to room temperature through the heat exchanger B , to remove the H generated in the reaction 2 O and high boilers 4, gas stream 5 contains 60% CH by chromatographic analysis 4 , 18% ethylene, 12% ethane, 6% CO, 3% CO 2 and 1%O 2 , into absorber C filled with 30% potassium carbonate aqueous solution, CO 2 The abs...

Embodiment 2

[0023] Attached figure 1 In the shown process, 40g Ce(2%)-Mn(2%)-Na is charged in methane oxidative coupling reactor A 2 WO 4 (5%) / SiO2 2 Catalyst, 30 g of 12% Ni / γ-Al was charged in reforming reactor E 2 o 3 catalyst. The two reactors were heated to 820 °C and 700 °C by an external heating furnace, respectively, with 5% H 2 / N 2 After reducing the Ni catalyst for 5 h, in N 2 Continue to heat reforming reactor E to 800°C; natural gas 1 and O containing 90% methane 2 2 respectively through the mass flow controller, control the flow rate of 15L / min and 4L / min, water is vaporized from 13 at a flow rate of 50ml / min, and then mixed with natural gas and O 2 Mix and enter the oxidative coupling reactor A after preheating at 400°C, the gas stream 3 after the reaction is cooled to room temperature through the cooler B, and the H produced in the reaction is removed 2 O and high boilers 4, gas stream 5 contains 58% CH by chromatographic analysis 4 , 22% ethylene, 8.5% ethane, ...

Embodiment 3

[0025]Attached figure 1 In the shown process, 10g Ce(2%)-Mn(2%)-Na 2 WO 4 (5%) / SiO2 2 Catalyst, loaded with 8 g of 12% Ni / γ-Al in reforming reactor E 2 o 3 catalyst. The reactor was heated to 800 °C and 750 °C by an external heating furnace, respectively, with 20% H 2 / N 2 After reducing the Ni catalyst for 4 h, the N 2 Continue to heat the reforming reactor to 820°C; methane 1 and O 2 2. Control the flow rate of 4L / min and 1L / min respectively through the mass flow controller, and enter the oxidative coupling reactor A after preheating at 400°C. After the reaction, the gas stream 3 is cooled to room temperature by the cooler to remove the h 2 O and high boilers, gas stream 5 contains 68% CH by chromatographic analysis 4 , 14% ethylene, 9% ethane, 5.5% CO, 2.5% CO 2 and 1%O 2 , enter the absorption tower D that ethylene adsorbent is housed after the absorber C of 30% potassium carbonate solution, the ethylene purity of separation is 92%, ethylene yield 12%; The ga...

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Abstract

The invention discloses a joint process for preparing ethylene and synthesis gas by direct conversion of methane. The invention provides the joint process for directly converting a methane-containing raw material into the ethylene and producing the synthesis gas at the same time. The process overcomes the limit of using single product as a target during directly preparing the ethylene from the methane in the past; and besides the methane is converted into the ethylene with high yield, the further utilization of the methane is also taken into consideration, namely, the methane can be converted into the synthesis gas with high yield.

Description

technical field [0001] The invention relates to a high-yield process for directly converting methane into ethylene and synthesis gas, in particular to a joint process for producing ethylene from methane in one step and producing carbon monoxide and hydrogen using two reactors. Background technique [0002] Methane is the main component in natural gas, biogas, and combustible ice, and there is also a considerable amount of methane in coalbed methane and oilfield associated gas. As early as the early 1980s, Keller and Bhasin discovered that methane could be directly converted to ethylene and ethane through an oxidative coupling reaction. Due to the high stability of the methane tetrahedron, its activation conversion requires a relatively high temperature, and usually the single-pass yield of ethylene and ethane does not exceed 30%. Using a loop reactor, the overall yield of ethylene can reach 45% (Vayenas, Appl. Cat. A: General 244:301, 2003). Even so, there is still a consi...

Claims

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Application Information

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IPC IPC(8): C07C11/04C07C2/84C01B3/38
CPCY02P20/10Y02P20/52
Inventor 丑凌军杨建宋焕玲赵军张兵牛建中李树本王晓来
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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