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Method for oxidative degradation of material containing organic substances with circulating water

A technology of organic matter and materials, applied in the field of efficient supercritical water oxidation reaction, can solve problems such as time-consuming and laborious exploration, and achieve the effect of large selection, reducing harsh requirements and reducing corrosion

Active Publication Date: 2020-06-12
INST OF URBAN AGRI CHINESE ACADEMY OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to achieve the best effect of supercritical water oxidation reaction, the existing process requires time-consuming and laborious exploration of suitable conditions such as temperature, reaction time and oxygen-carbon ratio, and even needs to design special reactors for different raw materials and reaction conditions.

Method used

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  • Method for oxidative degradation of material containing organic substances with circulating water
  • Method for oxidative degradation of material containing organic substances with circulating water
  • Method for oxidative degradation of material containing organic substances with circulating water

Examples

Experimental program
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Effect test

Embodiment 1

[0074] refer to figure 1 . The initial stream 1 was a suspension with a cellulose concentration of 1.0 wt. % before the secondary stream 2 was produced. The initial material flow 1 enters the equipment, and after being preheated to 200°C, it is supplied at a flow rate of 2 g / s. The oxidant material stream 4 without preheating is a 16.32wt% hydrogen peroxide solution with a flow rate of 0.5 g / s. The non-preheated oxidant stream 4 is heated to 180° C. to form the preheated oxidant stream 5 . The heated initial stream 1 and the oxidant stream 5 are mixed to form the feed stream 6 . Thus, the concentration of cellulose in feed material 6 is 0.72% by mass and the oxidizer stream provides twice the amount of oxygen required to fully oxidize the carbon in the organics. The temperature of the reactor is 380°C, the pressure is 25 MPa, and the volume is 166 milliliters. The residence time of the material in the reactor is 30 seconds. The temperature of the exchanger is lowered to 5...

Embodiment 2 to 12

[0078] Except for the contents shown in Table 1 below, it was carried out in substantially the same manner as in Example 1.

[0079] Table 1

[0080]

[0081] The percentage of the amount of organic matter converted into carbon dioxide per unit time to the amount of feed organic matter; "X" means that the substance cannot be recycled under this condition.

Embodiment 13

[0083] The method is basically the same as in Example 1, except that the organic matter in the initial material stream 1 is acetic acid with the same concentration as in Example 1, and the removal efficiency is 100%.

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Abstract

The invention relates to a method for oxidative degradation of material containing organic substances with circulating water, which comprises the following steps: (1) introducing water into a reactor,and enabling the water in the reactor to enter a supercritical state; (2) continuously feeding a feed material flow into the reactor and degrading the feed material in the process of passing throughthe reactor; (3) separating the partially degraded stream comprising the incompletely degraded organic matter discharged from the reactor into a gaseous product, a liquid product and a secondary stream; (4) supplying the secondary stream to the reactor as part of the feed stream; (5) continuously repeating the steps (2) to (4) to balance the reaction system; and (6) continuously repeating the steps (2) to (4) until the expected amount of initial material flow is treated. The method disclosed by the invention has the advantages of lower reaction temperature, small pollution, small oxidant dosage, small equipment, low corrosion resistance requirement, wide hardware material selection range, capability of treating different organic wastes under the same reaction condition and the like.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and environmental protection, and in particular relates to a new technology-based on a waste liquid circulation method to realize high-efficiency supercritical water oxidation reaction under mild conditions. [0002] technical background [0003] Supercritical water refers to water when the air pressure and temperature reach a certain value, the density of water expanded due to high temperature is exactly the same as the density of water vapor compressed due to high pressure. That is to say, when the water is in the state of high temperature and high pressure above its critical point (374.3°C, 22.05MPa), it is called supercritical water. Under this condition, water has many unique properties, such as good mass transfer properties and heat transfer properties, making supercritical water an excellent reaction medium, and non-polar organic substances (such as hydrocarbon organic substances) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F101/30
CPCC02F1/72C02F1/722C02F2101/30Y02P20/54
Inventor 张冬冬戚智勇周晚来林伟
Owner INST OF URBAN AGRI CHINESE ACADEMY OF AGRI SCI