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Method of preparing methanol through metal hydrothermal reduction of formic acid

A technology of formic acid and methanol, applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve problems such as incomplete combustion or biomass gasification, dependence on non-renewable energy, unfavorable industrialization, etc., and achieve low cost , broad development prospects and application space, no secondary pollution effect

Inactive Publication Date: 2012-05-16
TONGJI UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, methanol is produced industrially from H 2 and CO synthesis gas are prepared on Cu-based catalysts, the synthesis gas comes from incomplete combustion of fossil fuels or biomass gasification, the former is the main source of synthesis gas, but still depends on non-renewable energy
The traditional reduction of formic acid to prepare methanol requires the use of a strong reducing agent, lithium aluminum hydride or noble metal catalytic hydrogenation, which is dangerous and costly, and is not conducive to industrialization

Method used

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  • Method of preparing methanol through metal hydrothermal reduction of formic acid
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  • Method of preparing methanol through metal hydrothermal reduction of formic acid

Examples

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Effect test

Embodiment 1

[0023] Put the formic acid solution, copper powder and zinc powder into the SUS316 reaction tube, so that the filling rate reaches 35%, seal the reaction tube, put it in a salt bath at 300°C, the pressure is the corresponding saturated vapor pressure, and react for 7 hours. The product is analyzed by gas chromatography / hydrogen flame ion detector (GC-FID), and the spectrogram is as follows: figure 1 As shown in the middle curve a, the peak is methanol.

[0024] This method can be used to realize the conversion of formic acid to methanol products, and then use alkaline waste water or NaOH solution to adjust the pH of the product solution to 8, the formic acid in the solution is converted into formate, and the methanol in the liquid phase product is removed by distillation or rectification. Separation, the residual formate solution is used as the reactant of the next reaction, recycled, and can also enter the sewage treatment plant treated by traditional biological methods to su...

Embodiment 2

[0026] Put the formic acid solution, copper powder and aluminum powder into the SUS316 reaction tube, so that the filling rate reaches 35%, seal the reaction tube, put it in a salt bath at 300 ° C, the reaction pressure is the corresponding saturated vapor pressure, and react for 7 hours. The phase product was analyzed by gas chromatography / hydrogen flame ionization detector (GC-FID), and the spectrogram was as follows figure 1 As shown in the middle curve b, the peak is methanol.

[0027] This method can be used to realize the conversion of formic acid to methanol products, and then use alkaline waste water or NaOH solution to adjust the pH of the product solution=9, the formic acid in the solution is converted into formate, and the methanol in the liquid phase product is removed by distillation or rectification. Separation, the residual formate solution is used as the reactant of the next reaction, recycled, and can also enter the sewage treatment plant treated by traditiona...

Embodiment 3

[0029] Put the formic acid solution, nickel powder and zinc powder into the SUS316 reaction tube to make the filling rate reach 35%, then seal the reaction tube, put it in an oven at 180°C, the reaction pressure is the corresponding saturated vapor pressure, and react for 12 hours. Gas chromatography / hydrogen flame ionization detector (GC-FID) analysis is carried out to liquid phase product, and spectrogram is as follows figure 1 As shown in the middle curve c, the peak is methanol.

[0030] This method can be used to realize the conversion of formic acid to methanol products, and then use alkaline waste water or NaOH solution to adjust the pH of the product solution=9, the formic acid in the solution is converted into formate, and the methanol in the liquid phase product is removed by distillation or rectification. Separation, the residual formate solution is used as the reactant of the next reaction, recycled, and can also enter the sewage treatment plant treated by traditio...

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Abstract

The invention relates to a method of preparing methanol through metal hydrothermal reduction of formic acid. According to the invention, a catalyst, a reducing agent and formic acid are added into a reactor according to a mol ratio of 1-5: 0-5: 1, a filling rate is controlled to be 25 to 45%, reaction temperature is 180 to 350 DEG C, reaction pressure is saturated vapor pressure corresponding to the reaction temperature, a pH value is 1 to 1.5, and a reaction lasts for 1 to 12 h; therefore, formic acid is converted into methanol. Compared to the prior art, the method provided in the invention has the following advantages: capacity of highly efficiently converting formic acid into methanol which has a higher utilization value, good selectivity, a simple process, no secondary pollution and immense development potential.

Description

technical field [0001] The invention relates to a method for preparing methanol, in particular to a method for preparing methanol by metal hydrothermal reduction of formic acid. Background technique [0002] Formic acid, as the simplest carboxylic acid, is one of the basic chemical raw materials and an important product of hydrothermal reaction. Formic acid is the main product of the existing technology of using glycerin or metal hydrothermal reduction of carbon dioxide and the technology of recycling biomass wastewater. But in comparison, methanol that can be used as fuel has more important application value and energy value. [0003] With the global energy problem becoming more and more prominent, the voice of low-carbon economy is getting higher and higher, and the development of new clean energy is becoming more and more urgent. As early as the 1970s and 1980s, the concept of "methanol economy" was proposed. Methanol is an alcohol compound that is easy to store and tra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/04C07C29/147
CPCY02P20/52
Inventor 金放鸣吴冰程敏胡明博闫鹏钟恒
Owner TONGJI UNIV
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