Preparation of a silicon carbide reactor and its application in the process of direct methane to olefins

A technology of silicon carbide and reactors, which is applied in new reactors, aromatics and hydrogen processes, and direct conversion of methane to ethylene. It can solve problems such as inability to promote industrialization, low mechanical strength, and difficult connections, and achieve redox and hydrothermal Good stability, less difficulty in industrialization, and the effect of reducing energy consumption

Active Publication Date: 2020-06-05
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its cost is high, its mechanical strength is low, and its connection is difficult, so it cannot be promoted to industrialization.

Method used

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  • Preparation of a silicon carbide reactor and its application in the process of direct methane to olefins
  • Preparation of a silicon carbide reactor and its application in the process of direct methane to olefins
  • Preparation of a silicon carbide reactor and its application in the process of direct methane to olefins

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Mix 1kg SiC powder, 300g high-purity graphite powder, 300g silicon powder, 20g ferric nitrate, 100mL epoxy resin, and 100mL water. The SiC powder is α-SiC with a particle size of 100-400nm and silicon powder with a particle size of 100μm. , sent to the extruder for extruded molding, the forming reactor is a straight tube, 2 meters in length, 35mm in outer diameter, 25mm in inner diameter, after 4 days of natural drying, it is sent to a 50°C muffle furnace to continue drying and dehumidification, and continue to dry in the N 2 Under the protection of , it was treated in a high-temperature furnace at 2000°C for 2 days, taken out after cooling down, and the surface of the reactor was finely polished to obtain reactor R1.

Embodiment 2

[0038] Mix 1kg SiC powder, 200g high-purity graphite powder, 200g silicon powder, 20g ferric chloride, 100mL epoxy resin, and 100mL water. The SiC powder is α-SiC with a particle size of 300-1000nm. 100 μm, sent to the extruder for extruded molding, the forming reactor is a straight tube type, 2 meters in length, 15mm in outer diameter, 5mm in inner diameter, after 4 days of natural drying, it is sent to a muffle furnace at 50°C to continue drying and dehumidification, and then Carry out pressing treatment, pressing pressure is 100Mpa, and pressing time is 30 minutes. continue at N 2 Under the protection of , it was treated in a high-temperature furnace at 2000°C for 3 days, taken out after cooling down, and the surface of the reactor was finely polished to obtain reactor R2. figure 2 It is the proton fluorescence spectrogram of the inner wall of the reactor, and the bright spots are Fe atoms, indicating that the distribution of Fe is very uniform.

Embodiment 3

[0040] Mix 1kg SiC powder, 100g carbon black powder, 100g silica powder, 40g nickel chloride, 200mL epoxy resin, and 200mL water evenly. The SiC powder is α-SiC with a particle size of 300-500μm, and the silica The particle size of the powder is 200μm, and it is sent to the extruder for extrusion molding. The forming reactor is a straight tube type, with a length of 2 meters, an outer diameter of 25mm, and an inner diameter of 15mm. After natural drying for 4 days, it is sent to a muffle furnace at 50°C for further drying. Dehumidification continues at N 2 Under the protection of the reactor, it was treated in a high-temperature furnace at 2000°C for 4 days, taken out after cooling down, and the surface of the reactor was finely polished to obtain reactor R3.

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Abstract

The invention discloses a silicon carbide reactor, the material of the reactor is metal element lattice doped silicon carbide. The characteristics of the material with good thermal conductivity and chemical reaction inertness are utilized, ethylene is directly synthesized from methane through catalysis based on oxygen-free conditions in the reactor, thus zero carbon deposition of methane and highselectivity synthesis of ethylene are achieved, the convension rate of methane is 10-70%, the selectivity of ethylene is 40-75%, the selectivity of propylene is 5-15%, the selectivity of arenes is 0-40%, and zero carbon is deposited. The silicon carbide reactor has the characteristics of long catalyst lifetime(>1000 h), good stability of the catalyst under high temperature(<1700 DEG C), high conversion rate of methane and product selectivity, zero carbon deposition, small difficulty of industrialization, good process repeatability, and safe and reliable operation, and has broad industrial application prospect.

Description

technical field [0001] The invention relates to a novel reactor based on silicon carbide material, which is successfully applied in the process of producing ethylene, aromatics and hydrogen by direct conversion of methane. The process realizes high-efficiency conversion of methane, high-selectivity synthesis of ethylene and zero carbon deposition, and belongs to the technical field of catalytic reactors. Background technique [0002] Natural gas is a high-quality, clean energy, and its main component is methane (CH4). The world's methane reserves are huge, especially the recent discovery of hydrated methane in shale gas and seabed sediments in North America and China, making the methane reserves twice that of all proven fossil energy sources (calculated by carbon content). In recent years, the production and consumption of natural gas in the world have continued to grow, and its proportion in the primary energy structure has risen from 9.8% in 1950 to 24% at present, and is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J8/02B01J19/14C07C2/84C07C11/04B22F3/02B22F3/10
CPCY02P20/52
Inventor 包信和方光宗潘秀莲吕厚甫谭大力
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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