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Device and process for synthesizing methanol based on hydrogenation of carbon dioxide

A technology for synthesizing methanol and carbon dioxide, which is used in the separation/purification of hydroxyl compounds, the preparation of hydroxyl compounds, and the preparation of organic compounds, etc., can solve the problems of low conversion rate and poor selectivity, and achieves reduction of emissions, improvement of conversion rate, and high economy. effect of benefit

Pending Publication Date: 2021-01-08
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalysts widely researched and used in China still have the problems of low conversion rate and poor selectivity: the current conversion rate is generally maintained at 15-20%, and the target selectivity is about 70%, which is lower than the international advanced level

Method used

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  • Device and process for synthesizing methanol based on hydrogenation of carbon dioxide
  • Device and process for synthesizing methanol based on hydrogenation of carbon dioxide
  • Device and process for synthesizing methanol based on hydrogenation of carbon dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Cu / ZnO / Al 2 o 3 Preparation of type copper-based catalyst:

[0041] 169.3gCu(NO 3 ) 2 ·3H 2 O, 59.5gZn(NO 3 ) 2 ·6H 2 O and 35.5gAl 2 (NO 3 )3·9H 2 O was dissolved in 1L of deionized water and preheated to 60°C, and 100g of oxalic acid was weighed and dissolved in 3L of deionized water and preheated to 60°C. Under vigorous stirring, add the mixed nitrate solution to the alkali solution dropwise, and keep 60°C constant, stop adding liquid when the pH is between 7 and 8, stir and age at the same temperature for 2 hours, and then use 60°C deionized water The precipitate was washed, the filter cake was dried overnight in an oven at 90°C, and calcined at 350°C for 2 hours. The obtained powder was pressed into tablets and crushed to 20-40 mesh to obtain a catalyst precursor.

[0042] The obtained catalyst precursor was heated at 200°C in H 2 Roasting under atmosphere for 5h, the final Cu / ZnO / Al can be obtained 2 o 3 copper-based catalysts.

Embodiment 2

[0044] Utilize the Cu / ZnO / Al prepared by embodiment 1 2 o 3 Type copper-based catalysts for comparative simulation tests:

[0045] The effect of reaction temperature on the thermodynamic equilibrium of the system was studied by simulation, and the impact on CO 2 Effects on conversion and methanol selectivity. Through the above simulation, it provides a useful reference for improving the reaction conversion rate and reducing the energy consumption of the reaction process during the use of the carbon dioxide hydrogenation methanol synthesis unit.

[0046] Cu / ZnO / Al 2 o 3 The type copper-based catalyst is filled in the reactor to form a catalyst bed, and the temperature is raised to the reaction temperature. The molar ratio n(H 2 ) / n(CO 2 )=3, gas raw material CO 2 and H 2 After pre-mixing, preheat to 200°C, and then pass it into the reactor for catalytic reaction, the reaction volume space velocity GHSV is controlled at about 19000h -1 , the reaction pressure is contr...

Embodiment 3

[0057] Utilize the Cu / ZnO / Al prepared by embodiment 1 2 o 3 Type copper-based catalysts for comparative simulation tests:

[0058] The effect of reaction pressure on the thermodynamic equilibrium of the system was studied by simulation, and the impact on CO 2 Effects on conversion and methanol selectivity. Through the above simulation, it provides a useful reference for improving the reaction conversion rate and reducing the energy consumption of the reaction process during the use of the carbon dioxide hydrogenation methanol synthesis unit.

[0059] Cu / ZnO / Al 2 o 3 The type copper-based catalyst is filled in the reactor to form a catalyst bed, and the temperature is raised to the reaction temperature. The molar ratio n(H 2 ) / n(CO 2 )=3, gas raw material CO 2 and H 2 After pre-mixing, preheat to 200°C, and then pass it into the reactor for catalytic reaction, the reaction volume space velocity GHSV is controlled at about 19000h -1 , the reaction temperature is contr...

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Abstract

The invention discloses a device and process for synthesizing methanol based on hydrogenation of carbon dioxide. The device comprises a mixer, a reactor, a cooler, a flash tank and a tail gas diverging device, wherein the reactor is filled with a catalyst; gas raw materials including CO2 and H2 are introduced into the mixer; an outlet of the mixer is connected with an inlet of the reactor througha pipeline; an outlet of the reactor is connected with the flash tank through the cooler and a pipeline; aquatic methanol products are discharged from a liquid outlet in the bottom of the flash tank,and a gas outlet in the top of the flash tank is connected with an inlet of the tail gas diverging device through a pipeline; and an outlet of the tail gas diverging device is divided into two paths,one path is discharged to a tail gas treatment system, and the other path is connected with an inlet of the mixer through a pipeline, so a part of tail gas is separated out and enters a next cycle ascycle gas. According to the process, the effective utilization rate of CO2 can be greatly increased, and tail gas emission is reduced; and compared with other similar device processes, raw material input cost and tail gas treatment cost are saved, and high economic benefits are achieved.

Description

technical field [0001] The invention relates to a device and process for synthesizing methanol based on carbon dioxide hydrogenation. Background technique [0002] CO 2 As the most important greenhouse gas, it is the final product of hydrocarbon combustion and also a valuable carbon resource. CO 2 Hydrogenation of methanol is CO 2 Recycling is a promising research field, and the product methanol is an important basic chemical product and chemical raw material in the structure of modern chemical and energy industries. [0003] Carbon dioxide is the cheapest and most abundant carbon resource, but it is also a greenhouse gas. The massive emission of CO2 has caused the greenhouse effect, leading to serious environmental problems such as global warming. Realize CO through chemical methods 2 resource utilization as a CO 2 Emission reduction approach, which is very ideal and feasible, will reduce the CO that exists in large quantities in nature 2 This cheap carbon source co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/04C07C29/151C07C29/74C07C29/80
CPCC07C29/1518C07C29/74C07C29/80
Inventor 李亚飞刘建飞陈肖王柳闵邱绵振于燕坤林伟夏召顺蔡姚杰
Owner ZHEJIANG UNIV OF TECH
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