Method for preparing formic acid, methanol and methane by using metal hydro-thermal to reduce CO2

A CO2 and formic acid technology, applied in the field of waste recycling, can solve the problems of large power consumption, mineral resources, energy waste, etc., and achieve the effects of repeated recycling of resources, reduction of production costs, and convenient operation

Inactive Publication Date: 2008-09-17
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology combines two technical findsings - one involves converting harmful gases from flue gases (CO2) into usable chemical substances called formaldehydes that are important commercial sources like plastic resins, adhesives, paints, coatings, etc., while another focuses on producing these compounds with lower cost compared to current processes such as synthesis via petrochemistry.

Problems solved by technology

This patented technical problem addressed in this patents relates to finding methods for effectively removing harmful gases (CO) released during combustion processes like fossil fuel burning without consuming excessive amounts of power and materials used due to their long lifespan compared to other sources of pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The exhaust gas of coal-fired power plants is CO 2 One of the main sources of emissions. Currently, China's power sector emits 2.7 billion tons of CO2 per year 2 It ranks second in the world after the United States. Applying the present invention to the power sector, the waste CO emitted by it can be 2 The collection is passed into a hydrothermal reactor for treatment. Moreover, the waste heat of the power plant can provide the temperature required for some reactions, so that the energy consumption of hydrothermal treatment of carbon dioxide can be reduced.

[0020] In the small test, a tubular intermittent hydrothermal reactor with SUS316 stainless steel round tube was used for the experiment, the filling rate of water was 35%, and the CO 2 The content is 4.0g / L, and Zn powder is added into the reaction equipment together as a reducing agent. After adding, the content reaches 1-10mmol, and the pH=9. The experimental temperature is 300°C, the reaction pressure is 1...

Embodiment 2

[0024] The average operating efficiency of coal-fired industrial boilers is only 60%-65%. The annual emission of soot is about 2 million tons, sulfur dioxide is about 7 million tons, and carbon dioxide is nearly 1 billion tons. It is the second largest source of soot pollution after thermal power plants. . In response to this situation, hydrothermal reaction devices can be installed in each coal-fired plant to collect and process the exhaust gas emitted by it.

[0025] In the small test, a batch reactor made of plastic king was used for the experiment, the filling rate of water was 30%, and the CO 2 The content is 3.5g / L, and Al powder is put into the reactor together as a reducing agent. After adding, the content reaches 8-40mmol, pH=9-10, the reaction temperature is 250°C, the reaction pressure is 7Mpa, and the reaction time is 12h. After the reaction, the products were detected by GC / MS and HPLC detectors. The analysis results showed that formic acid was the main product w...

Embodiment 3

[0029] Emissions of greenhouse gases such as carbon dioxide from waste incineration plants are increasing, and it has been calculated that most incinerators produce more carbon dioxide per year than thermal power plants. For the large amount of carbon dioxide contained in the flue gas, a hydrothermal treatment equipment can be built on site to collect the discharged waste gas and use it as raw material for hydrothermal conversion. Moreover, the large amount of heat energy brought by incineration can fully provide the temperature required for the reaction, so that the operating cost of hydrothermal treatment of carbon dioxide is further reduced.

[0030] In the small test, a tubular batch reactor with a SUS316 stainless steel round tube was used for the experiment, the filling rate of water was 35%, and the CO 2 The content is 4.0g / L, and Al powder is added into the hydrothermal reaction equipment together as a reducing agent. After adding, the content reaches 1-10mmol, and the...

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Abstract

The invention discloses a method of reducing CO2 to prepare methanoic acid, methanol and methane under hydrothermal conditions by using metal, and relates to the method of transforming pure CO2 gas or CO2 in waste gas into industrial material that is the methanoic acid, the methanol and the methane. The pure CO2 or CO2 in waste gas, water as well as reducer, and a catalyst are put in a hydrothermal reactor; the CO2 is performed through hydrothermal reduction to obtain the methanoic acid, the methanol and the methane under the conditions that the addition quantity of the reducer is 1 to 25 times (by molar ratio) the content of the CO2 which is put in the reaction equipment, the addition quantity of the catalyst is 0 to 10 times (by molar ratio) the quantity of the reducer, the reaction temperature ranges from 200 DEG C to 245 DEG C, the reaction pressure ranges from 5MPa to 25MPa, the pH value ranges from 8 to 14, and the reaction time ranges from 10 minutes to 12 hours. A gaseous phase products that is the methane can be collected through gas-liquid separation, and the methanoic acid and the methanol mixed solution is separated and purified at the same time. The method efficiently transforms the CO2 into organic matters with high additional value in a low consumption way, the CO2 is changed into resource, the technology is simple without the secondary pollution, and worthful economic and social benefits are realized.

Description

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Claims

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Application Information

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Owner TONGJI UNIV
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