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Method for preparing formic acid through hydrothermal reduction of CO2 by carbohydrate biomass

A carbohydrate and biomass technology, applied in the preparation of organic compounds, chemical instruments and methods, organic chemistry, etc., to achieve the effects of convenient operation, no secondary pollution, and low cost

Inactive Publication Date: 2010-07-14
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although, recently there have been some CO 2 However, these studies generally use external hydrogen as a reducing agent or conduct reactions at high temperatures, and require precious metals or metal oxides as catalysts.

Method used

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  • Method for preparing formic acid through hydrothermal reduction of CO2 by carbohydrate biomass
  • Method for preparing formic acid through hydrothermal reduction of CO2 by carbohydrate biomass
  • Method for preparing formic acid through hydrothermal reduction of CO2 by carbohydrate biomass

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Embodiment 1

[0023] attached figure 1 It is a schematic process flow diagram of the present invention. The raw material biomass in the hydrothermal reaction process of the present invention is divided into three forms:

[0024] 1. Feed the crushed biomass directly into the reactor while feeding CO 2 , the cellulose contained in biomass directly reduces CO under hydrothermal conditions 2 ;

[0025] Second, the crushed biomass is converted into glucose, hexyl alcohol, etc. through hydrothermal reaction, and then these glucose and hexyl alcohol enter the reactor and are combined with CO 2 Mixed, CO reduction under hydrothermal conditions 2 ;

[0026] 3. The crushed biomass is converted into glucose, hexyl alcohol, etc. through conventional acidolysis reaction, and these glucose and hexyl alcohol enter the reactor to be mixed with CO 2 Mixed, CO reduction under hydrothermal conditions 2 .

[0027] Small-scale experiments use cellulose (polysaccharide) and the most basic monosaccharides...

Embodiment 2

[0032] CO 2 Use of CO emitted by coal chemical enterprises 2 , CO in coal-to-oil and coal-to-methanol industries 2 The emissions were 9.2 tons of CO 2 / ton of synthetic oil, 3.8 tons of CO 2 / ton of methanol, and CO in the exhaust gas 2 The purity is as high as 80-90%. Coal chemical enterprises select appropriate hydrothermal reactors according to actual needs, including CO 2 The exhaust gas can be directly passed into the hydrothermal reactor, other components in the exhaust gas such as SO x , NO x etc. had no effect on the reaction.

[0033] There are more than 600 million tons of crop straws in my country every year. At present, direct combustion is the most important way to use straws. About 140 million tons of straws are directly used for burning every year, which not only causes serious ecological and environmental problems, but also greatly consumes resources. waste. Straw contains about 30% cellulose, and the use of straw to reduce CO emissions from coal chem...

Embodiment 3

[0036] CO 2 The source is the exhaust from coal-fired power plants. 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. my country is the largest rice producer in the world, and the sown area of ​​rice accounts for about 23% of the whole world. The chaff contains about 23.16% cellulose, and the chaff is crushed to a particle size of 1-10 mm, then dried, and directly enters the reactor. Use a carbon content analyzer to measure the carbon content in the chaff, according to the carbon content in the chaff: CO in the exhaust gas 2 : NaOH=3: (5~20): (5~20) mol ratio is added in the reactor, the carbon concentration of chaff is kept on 1.2~2.4mol / l, the addition of water is by filling rate 30%~ 60% multiplied by the reactor volume. CO emissions from coal-fired power plants 2 The collection is passed into the hydrothermal reactor for treatment, and the waste heat of the power plant can provide the temper...

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Abstract

The invention discloses a method for preparing formic acid through hydrothermal reduction of CO2 by carbohydrate biomass and relates to a process that the CO2 is reduced into the formic acid by utilizing the carbohydrate biomass and the carbohydrate biomass is converted into lactic acid, acetic acid, the formic acid and other chemical raw materials with high added value. The process comprises the following steps: firstly, mixing the CO2, water, alkali and the carbohydrate biomass; secondly, reacting for 20 to 300 minutes under the condition that the temperature is between 150 and 400 DEG C, the pressure is between 2 and 25MPa and pH value is between 6 and 13, wherein the CO2 is reduced into the formic acid by the carbohydrate biomass and the carbohydrate biomass is also converted into the lactic acid, the acetic acid, the formic acid and the like; and finally, performing decompression, distillation and separation according to different boiling points of the formic acid, the acetic acid and the lactic acid to obtain the formic acid, the acetic acid and the lactic acid. The method realizes the CO2 recycling and the carbohydrate biomass recycling; and as a reducing agent for reducing the CO2 is renewable resource of the carbohydrate biomass which is obtained through photosynthesis of the CO2 and H2O, the method indirectly utilizes solar energy.

Description

technical field [0001] The invention relates to a method for reducing CO with carbohydrate biomass 2 At the same time, biomass itself is also converted into high value-added chemical raw materials such as lactic acid, acetic acid and formic acid. Specifically, a hydrothermal reduction process is adopted for conversion, which belongs to the technical field of environmental engineering and the technical field of waste recycling. Background technique [0002] by CO 2 The greenhouse effect caused by environmental pollution is one of the most concerned environmental problems in the world. If measures are not taken in time to reverse the trend of global warming, it will directly threaten the survival of human beings and the earth. but only through the CO 2 The reduction of emissions to control the greenhouse effect still cannot fully meet our requirements, CO 2 It is the final product after the combustion of all organic matter, if the emitted CO can be 2 Direct and rapid red...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C53/02C07C51/15C07C53/08C07C59/08
Inventor 金放鸣周华珍曹江林吴冰魏振陈洪娟钟恒
Owner TONGJI UNIV
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