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Method for co-producing alcohol and hydrogen through chemical chain conversion of natural gas hydrate

A technology of natural gas and physical chemistry, applied in chemical instruments and methods, physical/chemical process catalysts, bulk chemical production, etc., to achieve the effects of high comprehensive resource utilization efficiency, wide application scenarios, and easy operation

Pending Publication Date: 2022-07-08
GUANGDONG LAB OF SOUTHERN OCEAN SCI & ENG GUANGZHOU +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On this basis, the present invention provides a method for the chemical chain conversion of natural gas hydrate to co-produce alcohol hydrogen, which can solve the problem of subsequent clean and high-value utilization of natural gas hydrate

Method used

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  • Method for co-producing alcohol and hydrogen through chemical chain conversion of natural gas hydrate
  • Method for co-producing alcohol and hydrogen through chemical chain conversion of natural gas hydrate
  • Method for co-producing alcohol and hydrogen through chemical chain conversion of natural gas hydrate

Examples

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Embodiment 1

[0027] The present embodiment discloses a method for co-producing alcohol hydrogen by chemical chain conversion of natural gas hydrate, comprising the following steps:

[0028] (1) Natural gas hydrate is released into gas-phase products and liquid-phase products through three-stage decompression at 6MPa, 2MPa, and 1MPa (temperature range is -160°C to normal temperature), reducing heat loss and realizing gas-liquid separation.

[0029] (2) The Fe / Ni / Al-based composite oxygen carrier precursor was constructed by chemical precipitation, and then calcined at 1000 °C for 3 hours, and then crushed and screened to prepare oxygen carrier particles with a particle size ranging from 60 to 80 meshes.

[0030] (3) The gas phase product obtained in step (1) and the Fe / Ni / Al (atomic ratio 0.6 / 0.2 / 0.2) based composite oxygen carrier obtained in step (2) are subjected to a chemical chain reforming process to prepare syngas, and the reaction temperature is 850°C, the reaction residence time wa...

Embodiment 2

[0038] Since the method of chemical chain conversion of natural gas hydrate for co-production of alcohol and hydrogen is the same as that in Example 1, it will not be repeated here, only the implementation conditions are listed in Table 1, and the implementation results are shown in Table 1.

[0039] Table 1 Example of chemical chain conversion of natural gas hydrate for co-production of alcohol hydrogen

[0040]

[0041] In this example, the Fe / Cu / Si-based composite oxygen carrier is constructed by the chemical chain self-assembly method, and then calcined at 950° C. for 4 hours, crushed and sieved to prepare oxygen carrier particles with a particle size ranging from 60 to 80 meshes. The preparation method of the synthetic methanol catalyst is the same as that in Example (1), and the active components and auxiliary agents used are indicated in the table.

Embodiment 3

[0043] Since the method for co-producing high-purity hydrogen by chemically chaining olefins from natural gas hydrate is the same as that in Example 1, it will not be repeated here, and only the implementation conditions and implementation results are listed in Table 2, as shown in Table 2.

[0044] Table 2 Examples of chemical chain conversion of natural gas hydrate for co-production of alcohol and hydrogen

[0045]

[0046]

[0047] The difference between Example 1 and Example 2 is that the oxygen carrier, the reaction temperature, the catalyst for synthesizing methanol and the reaction assistant are different. In Example 2, the methane conversion efficiency in the chemical chain reforming stage is improved, and the methanol selectivity in the methanol synthesis stage is good, In the hydrogen production stage, the hydrogen product concentration decreased. In Example 3, Fe / Mn / Ca oxygen carrier and Ce auxiliary agent are used to have better resistance to carbon depositio...

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Abstract

The invention discloses a method for co-producing alcohol and hydrogen through chemical chain conversion of natural gas hydrate. According to the method, gas and liquid two-phase composition of the natural gas hydrate is converted into methanol and high-purity hydrogen through the steps of oxygen carrier preparation, chemical looping reforming, methanol synthesis, chemical looping hydrogen production, oxygen carrier regeneration and the like, high-value utilization of the natural gas hydrate is achieved, and the comprehensive utilization efficiency of resources is high. The technology does not need an oxidizing medium preparation process in the traditional methanol synthesis process, has the advantages of simple process, low cost, cleanness, environmental protection and good economic benefit of the product, partially solves the problem that the traditional natural gas hydrate is difficult to store and transport, and has a wide application prospect.

Description

technical field [0001] The invention relates to the fields of fuel clean conversion, functional materials and environmental protection, in particular to a method for co-producing alcohol hydrogen by chemical chain conversion of natural gas hydrate. Background technique [0002] Natural gas hydrate is an ice-like crystalline compound with a cage-like structure formed under low temperature and high pressure conditions. It is mainly produced in seabed sediments and onshore permafrost. It has non-stoichiometric properties, phase equilibrium properties, and self-protection properties. equal properties. Natural gas hydrate contains huge natural gas resources, 1m 3 Natural gas hydrate is equivalent to 160~180m 3 (standard) natural gas, based on this estimate, about 1.8×10 16 ~2.1×10 16 m 3 The total amount of natural gas resources is equivalent to twice the total proven coal, oil and natural gas resources in the world. Some studies have shown that the total natural gas hydrat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/151C07C29/154C07C29/157C07C31/04C01B3/02B01J23/755B01J23/887B01J23/889B01J23/89B01J23/94B01J38/02B01J38/12
CPCC07C29/1518C07C29/154C07C29/157C01B3/02B01J23/755B01J23/94B01J23/8872B01J23/8892B01J23/8993B01J38/02B01J38/12C07C31/04Y02P20/584
Inventor 袁浩然魏国强王亚琢顾菁张军陈勇
Owner GUANGDONG LAB OF SOUTHERN OCEAN SCI & ENG GUANGZHOU
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