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Method for preparing acetic acid from microalgae by hydrothermal oxidation of oxidized metal compounds

A metal compound, hydrothermal oxidation technology, applied in the field of environmental engineering technology and waste recycling, can solve the problem of low acetic acid production, achieve the effects of avoiding reuse and separation process, convenient operation and low cost

Active Publication Date: 2015-10-14
金 放鸣
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the yield of acetic acid obtained by this technology is not high, only 9%. How to realize the efficient transformation of microalgae based on the existing technology is an extremely important direction for our research.

Method used

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  • Method for preparing acetic acid from microalgae by hydrothermal oxidation of oxidized metal compounds
  • Method for preparing acetic acid from microalgae by hydrothermal oxidation of oxidized metal compounds
  • Method for preparing acetic acid from microalgae by hydrothermal oxidation of oxidized metal compounds

Examples

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Effect test

Embodiment 1

[0024] This example relates to a method for preparing acetic acid by hydrothermally oxidizing microalgae with metal oxides (CuO powder), and the method includes the following steps:

[0025] Put CuO powder and microalgae into a tubular intermittent hydrothermal reactor with a SUS316 stainless steel round tube at a molar ratio of 0.5:1, adjust the alkalinity with NaOH, add water to make the filling rate 20-60%, and then seal the reaction tube , where the reaction temperature is 250-325°C, the reaction pressure is 5-20Mpa, and the reaction time is 0.5-4h, and acetic acid can be obtained.

[0026] See figure 1 As shown, after the reaction, the product is subjected to qualitative and FID quantitative analysis by GC / MS. GC / MS qualitative analysis shows that acetic acid is the main product, and FID quantitative analysis shows that the highest yield can reach 30.9%. In industrial applications, a suitable hydrothermal reactor can be used according to the needs, and the reaction tempe...

Embodiment 2

[0029] This embodiment relates to a metal oxide (Fe 2 o 3 Powder) a method for preparing acetic acid by hydrothermally oxidizing microalgae, the method comprising the following steps:

[0030] Will Fe 2 o 3 Powder and microalgae are loaded into a tubular intermittent hydrothermal reactor with a SUS316 stainless steel round tube at a molar ratio of 4:1, the alkalinity is adjusted with KOH, water is added to make the filling rate 20-60%, and then the reaction tube is sealed. The reaction temperature is 250-325°C, the reaction pressure is 5-20Mpa, and the reaction time is 0.5-4h to obtain acetic acid.

[0031] After the reaction, the product was subjected to qualitative and FID quantitative analysis by GC / MS. GC / MS qualitative analysis showed that acetic acid was the main product, and FID quantitative analysis showed that the highest yield could reach 17.6%. In industrial applications, a suitable hydrothermal reactor can be used according to the needs, and the reaction temper...

Embodiment 3

[0034] This embodiment relates to a metal oxide (Al 2 o 3 Powder) a method for preparing acetic acid by hydrothermally oxidizing microalgae, the method comprising the following steps:

[0035] Will Al 2 o 3 Powder and microalgae are loaded into a tubular intermittent hydrothermal reactor with a SUS316 stainless steel round tube at a molar ratio of 3:1, and Ca(OH) 2 Adjust the alkalinity, add water to make the filling rate 20-60%, and then seal the reaction tube, wherein the reaction temperature is 250-325°C, the reaction pressure is 5-20Mpa, and the reaction time is 0.5-4h to obtain acetic acid.

[0036] After the reaction, the product was subjected to qualitative and FID quantitative analysis by GC / MS. GC / MS qualitative analysis showed that acetic acid was the main product, and FID quantitative analysis showed that the highest yield could reach 13.8%. In industrial applications, suitable hydrothermal reactors can be used according to the needs, and the reaction temperature ...

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Abstract

The present invention provides a method for preparing acetic acid through hydrothermal oxidation of microalgae by using an oxidation state metal compound. The method comprises: conveying an oxidation state metal compound and microalgae powder into a hydrothermal reactor, carrying out a hydrothermal oxidation reaction under an alkaline condition to obtain the high added value product acetic acid and concurrently obtain the elemental reduction metal. According to the method, the traditional oxidants such as hydrogen peroxide, oxygen, air and the like are not used, such that high cost and pollution due to use of the traditional oxidant are avoided; the acetic acid yield can be more than 30%; the considerable economic benefits are provided; and the method has advantages of simple preparation process, low cost, easy operation, no secondary pollution, and high conversion efficiency.

Description

technical field [0001] The invention belongs to the technical fields of environmental engineering technology and waste resource utilization, and in particular relates to a method for preparing acetic acid by hydrothermally oxidizing microalgae with oxidized metal compounds. Background technique [0002] The global energy demand continues to expand, and the search for renewable and clean energy that can replace petroleum in the energy structure is currently a hot spot of widespread concern. As an inexhaustible renewable energy source and the only renewable carbon source, biology has attracted widespread attention. Among them, compared with other traditional terrestrial plants, algae not only have the characteristics of strong environmental adaptability, high biological output, high photosynthetic efficiency, short growth cycle, and do not occupy the land of crops, etc., they are good raw materials for preparing other bioenergy, so microalgae are in The conversion of solar en...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C53/08C07C51/16
CPCC07C51/16C07C53/08
Inventor 金放鸣朱莺莺恽俊曾旭姚国栋
Owner 金 放鸣