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Process for preparing methanol from carbon dioxide based on low-temperature plasma hydrogenation method

A low-temperature plasma and carbon dioxide technology, which is used in the preparation of hydroxyl compounds, the preparation of organic compounds, and the chemical industry to achieve the effects of mild reaction conditions, promotion of conversion, and low equipment requirements.

Inactive Publication Date: 2017-05-31
ASIA SILICON QINGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, there are no documents and patents related to the preparation of methanol by low-temperature plasma of carbon dioxide, or the report of synergistic preparation of methanol by low-temperature plasma of carbon dioxide / catalyst

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  • Process for preparing methanol from carbon dioxide based on low-temperature plasma hydrogenation method
  • Process for preparing methanol from carbon dioxide based on low-temperature plasma hydrogenation method
  • Process for preparing methanol from carbon dioxide based on low-temperature plasma hydrogenation method

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Embodiment 1

[0042] Embodiment 1, with reference to figure 1 , the process method for preparing methanol by low-temperature plasma hydrogenation of carbon dioxide, comprising the following steps:

[0043] 1) Pre-mixing: The feed molar ratio of carbon dioxide and hydrogen is 1:3, the ratio is adjusted through a mass flow meter, and hydrogen and carbon dioxide enter the pre-mixer through the delivery pipeline for pre-mixing;

[0044] 2) Preheating: heat the raw material gas premixed in step 1) in the preheater, and the heating temperature is 15°C;

[0045] 3) First-stage reaction: The preheated raw material gas is introduced into the first-stage DBD integrated reactor through the delivery pipeline for the first-stage reaction;

[0046] with TiO 2 , CdS and CaTiO 3 As a catalyst, the particle size of the catalyst is 1.5-2.5mm, and the filling length is 80cm; the driving power is a sinusoidal AC power supply, the discharge frequency is 30kHz, the driving voltage is 10kV, the power is 100W, ...

Embodiment 2

[0061] Embodiment 2 is different from Embodiment 1 in that the process for preparing methanol by low-temperature plasma hydrogenation of carbon dioxide comprises the following steps:

[0062] 1) Pre-mixing: The feed molar ratio of carbon dioxide and hydrogen is 1:1, the ratio is adjusted through a mass flow meter, and hydrogen and carbon dioxide enter the pre-mixer through the delivery pipeline for pre-mixing;

[0063] 2) Preheating: heat the raw material gas premixed in step 1) in the preheater, and the heating temperature is 30°C;

[0064] 3) First-stage reaction: The preheated raw material gas is introduced into the first-stage DBD integrated reactor through the delivery pipeline for the first-stage reaction;

[0065] Take ZnO, WO 3 , SrTiO 3 As a catalyst, the particle size of the catalyst is 1.5-2.5mm, and the filling length is 80cm; the driving power is a sinusoidal AC power supply, the discharge frequency is 1MHz, the driving voltage is 50kV, the power is 500W, and th...

Embodiment 3

[0073] Embodiment 3 is different from Embodiment 1 in that the process for preparing methanol by low-temperature plasma hydrogenation of carbon dioxide comprises the following steps:

[0074] 1) Pre-mixing: The feed molar ratio of carbon dioxide and hydrogen is 1:10, and the ratio is adjusted through a mass flow meter. Hydrogen and carbon dioxide enter the pre-mixer through the delivery pipeline for pre-mixing;

[0075] 2) Preheating: heat the raw material gas premixed in step 1) in the preheater, and the heating temperature is 50°C;

[0076] 3) First-stage reaction: The preheated raw material gas is introduced into the first-stage DBD integrated reactor through the delivery pipeline for the first-stage reaction;

[0077] with TiO 2 , Fe 2 o 3 , BaTiO 3 As a catalyst, the particle size of the catalyst is 1.5-2.5mm, and the filling length is 80cm; the driving power is a sinusoidal AC power supply, the discharge frequency is 500Hz, the driving voltage is 5kV, the power is 20...

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Abstract

The invention discloses a process for preparing methanol from carbon dioxide based on a low-temperature plasma hydrogenation method, comprising the following steps: premixing; preheating, wherein the heating temperature is 15-50 DEGC; reaction, wherein the premixed materials are guided into a DBD (Dielectric Barrier Discharge) integrated reactor for reaction; separation, wherein products obtained after the reaction, including methanol, water and unreacted carbon dioxide and hydrogen, are separated in a separation unit; and purification, wherein pure methanol enters a product tank in liquid form. The process disclosed by the invention has the following advantages and beneficial effects: first, carbon dioxide can be efficiently converted into the methanol, and clean energy such as solar energy and the like can be selected as a driving energy; second, the reaction can be completed in a condition close to a room temperature, and has the characteristics of moderate reaction condition, high carbon dioxide conversion efficiency, low requirement for equipment and lower cost; third, a lot of optical radiation will be produced in the process of gas discharge, and can be utilized effectively when DBD is used in cooperation with a catalyst, and therefore conversion of the carbon dioxide is greatly promoted.

Description

technical field [0001] The invention relates to the technical field of methanol preparation, in particular to a process for preparing methanol by using carbon dioxide. Background technique [0002] Carbon dioxide is the main greenhouse gas, and increasing levels of greenhouse gases in the atmosphere can have devastating effects on the environment and climate. In recent decades, due to the extensive use of petroleum energy, global carbon dioxide emissions have increased year by year. According to the latest survey report released by the United Nations Meteorological Agency, the global carbon dioxide emission rate will exceed 40 billion tons in 2016. The rapid increase of carbon dioxide content in the atmosphere makes the greenhouse effect more obvious, and at the same time causes irresistible harm to the environment and climate. Therefore, the study of carbon dioxide conversion and utilization technology is of great significance to reduce the emission of carbon dioxide to th...

Claims

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Application Information

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IPC IPC(8): C07C29/152C07C29/153C07C31/04
CPCC07C29/152C07C29/153C07C31/04Y02P20/50Y02P20/52
Inventor 张宝顺肖建忠宗冰蔡延国鲍守珍王体虎
Owner ASIA SILICON QINGHAI
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