CN104923035B - Adsorption solution for benzene-methylbenzene-xylene-including waste gas and application thereof - Google Patents

Abstract

The invention discloses a triphenyl waste gas adsorption liquid and application thereof. The adsorption liquid includes emulsion, surfactant, sodium carboxymethylcellulose and water. The triphenyl waste gas adsorption liquid of the present invention uses emulsion as the substance mainly absorbing aromatic hydrocarbon waste gas, which has the characteristics of stable chemical properties, non-toxicity, and non-corrosion, and will not cause secondary pollution while absorbing toxic and harmful substances. At the same time, the use of recycled freon greatly increases the absorption rate of aromatics waste gas while reusing waste. After dissolving aromatics, the relative volatility of aromatics can be greatly reduced, and the content of triphenyl in the air can be reduced to a relatively low level, improving the factory and its surrounding environment.

Description

A kind of triphenyl waste gas adsorption liquid and its application

technical field

The invention relates to the field of triphenyl waste gas treatment, in particular to a triphenyl waste gas adsorption liquid and its application.

Background technique

Under the normal working conditions of the PX production plant, during the production and transportation process, the intermediate products or products of aromatic hydrocarbons are usually very volatile and may leak and produce toxic waste gas. Usually, a gas containing benzene, toluene and xylene is volatilized, referred to as triphenyl waste gas.

Benzene is a product of coal tar distillation or petroleum cracking, a colorless, transparent liquid with an aromatic odor. Toluene and xylene are methyl derivatives of benzene. The EPA lists benzene, toluene, and xylene as priority pollutants, which are extremely toxic to various life forms. When the triphenyl exhaust gas in the factory diffuses to the surrounding residential areas, when inhaling high-concentration "triphenyl" vapor, it will affect the redox function of cells in the human body, reduce cell activity, reduce ATP synthesis, and inhibit the secretion of acetylcholine, resulting in anaesthetization. Chronic poisoning mainly damages the hematopoietic function, reduces the leukocytes, and causes bleeding in the skin and mucous membranes. In severe cases, it will cause aplastic anemia and death. Therefore, these exhaust gases must be treated to reduce the harm to the surrounding residents.

In air-conditioning and refrigeration, common pollutants such as freon are often produced. If such substances cannot be disposed of in time, they will produce a certain "greenhouse effect", and its greenhouse effect is higher than that of carbon dioxide. At present, the main method for dealing with Freon is the combustion method. The shortcoming of this method is that its reaction mechanism needs to be further studied; the influence of temperature on the degree of decomposition during the reaction process, and whether secondary pollutants will be produced during the combustion process, etc. need to be further studied. In-depth research, the specific process is not yet mature. Therefore, if Freon can be effectively recycled and reused, it will bring good benefits to the environment.

Contents of the invention

Aiming at the defects and deficiencies in the prior art, the purpose of the present invention is to provide a triphenyl waste gas adsorption liquid, which is used to control the content of triphenyl waste gas in residential areas near the factory, which not only solves the problem of triphenyl waste gas absorption but also improves the air conditioner. Freon left over from refrigeration was recovered.

For achieving the above object, the technical scheme that the present invention takes is:

A triphenyl exhaust gas adsorption liquid, the adsorption liquid includes emulsion, surfactant, sodium carboxymethylcellulose and water; the emulsion includes Freon and N-formylmorpholine.

Specifically, in the emulsion, by volume ratio: Freon: N-formylmorpholine = 0.01-0.5: 0.9-0.1.

More specifically, the components in the adsorption liquid are by mass: 13-23 parts of emulsion, 1-2 parts of surfactant, 1-3 parts of sodium carboxymethylcellulose, and 7500-8500 parts of water.

The surfactant includes fatty acid glycerides, sucrose fatty acid esters or a mixture of the two.

In addition, the emulsion includes freon recovery liquid and N-formylmorpholine, and the freon recovery liquid is waste liquid collected from air conditioners after refrigeration;

The mass percentage of freon in the freon recovery liquid is 30%-50%, calculated by volume ratio, freon recovery liquid:N-formylmorpholine=0.1-0.9:0.9-0.1.

The described triphenyl waste gas adsorption liquid is used for the application of triphenyl waste gas adsorption.

The beneficial effects of the present invention are:

(1) The present invention contacts the triphenyl waste gas with the adsorption liquid, first utilizes the adsorption liquid to absorb the triphenyl waste gas, and then utilizes the solubility of the emulsion to the aromatic hydrocarbon substance to absorb it, thereby purifying the gas;

(2) The triphenyl exhaust gas adsorption liquid of the present invention contains freon and N-formylmorpholine emulsion as the material mainly absorbing aromatic hydrocarbon exhaust gas. It has the characteristics of stable chemical properties, non-toxic, non-corrosive, etc. At the same time, it will not cause secondary pollution;

(3) Simultaneously, the present invention utilizes the freon recovered after air-conditioning refrigeration, and the absorption rate of aromatics waste gas is greatly increased while the waste is reused, and the relative volatility of aromatics can be greatly reduced after dissolving aromatics, so that the triphenyl content in the air is reduced to a relatively low level To a low degree, improve the factory and its surrounding environment.

detailed description

The working principle of the present invention is: triphenyl waste gas refers to the mixed gas of benzene, toluene and xylene, and the triphenyl waste gas is contacted with the adsorption liquid of the present invention. It is absorbed by its solubility, so that the gas is purified.

The use method of the present invention is: according to the triphenyl waste gas adsorption liquid: water=1:6～12 volume ratio is made into triphenyl waste gas adsorption liquid aqueous solution, that is: first add 3～6 volume parts of water in the tank, then press to add 1 part by volume of the triphenyl waste gas adsorption liquid of the present invention, after fully stirring, add 3 to 6 parts by volume of water, and stir evenly;

The waste gas adsorption simulation process is as follows: Take 100mL of the prepared triphenyl waste gas adsorption solution aqueous solution and put it in a beaker, and put it in the triphenyl waste gas environment (benzene:toluene:xylene volume ratio is 2:1:1), the volume of the waste gas is It is 1m ³ , absorbed for a certain period of time and taken out; and the content of triphenyl was detected by gas chromatography.

The detailed structure of the present invention will be further described below in combination with specific embodiments.

Example 1:

The freon recovery solution in this embodiment adopts freon R22, freon R12, etc., which are commonly used in air conditioners and refrigerator refrigeration. Freon recovery solutions with different concentrations have different absorption effects on waste gas. The triphenyl waste gas adsorption liquid in this embodiment is Made as follows:

1. The components and proportioning are: 18 parts by weight of emulsion, 1 part by weight of surfactant, 1 part by weight of sodium carboxymethylcellulose and 8000 parts by weight of water. The surfactant used in this embodiment is fatty acid glyceride;

2. The production method is:

Step 1: Production of the emulsion: add Freon recovery solution and N-formylmorpholine in sequence in the reaction kettle according to the proportion, turn on the reaction kettle and stir, stir for 3 hours until completely dissolved, and form the FN-1 emulsion;

Step 2: Preparation of triphenyl waste gas adsorption liquid: add water FN-1 emulsion, surfactant, sodium carboxymethyl cellulose aqueous solution and water into the reaction kettle in sequence according to the ratio, turn on the reaction kettle and stir, and stir for 2.5 hours to completely dissolve That's it.

The mass percent concentration of Freon in the Freon recovery liquid is 48.1%, and the Freon recovery liquid:N-formylmorpholine=0.5:0.5 by volume ratio.

It is simulated in the laboratory, and its absorption effect is shown in Table 1.

Example 2:

The difference between the triphenyl exhaust gas adsorption solution described in this implementation and Example 1 is that the Freon recovery solution in the emulsion: N-formylmorpholine=0.6:0.4, and the surfactant used is sucrose fatty acid ester. It is simulated in the laboratory, and its absorption effect is shown in Table 1.

Example 3:

The difference between the triphenyl waste gas adsorption liquid described in this implementation and Example 1 is that the Freon recovery liquid in the emulsion: N-formylmorpholine=0.7:0.3, the mixture of the surfactant fatty acid glyceride and sucrose fatty acid lipid used , the mass ratio of fatty acid glyceride to sucrose fatty acid lipid is 1:1. It is simulated in the laboratory, and its absorption effect is shown in Table 1.

Example 4:

The difference between the triphenyl waste gas adsorption liquid described in this implementation and Example 1 is that the Freon recovery liquid in the emulsion: N-formylmorpholine=0.8:0.2; it is simulated in the laboratory, and its absorption effect is shown in Table 1 .

Example 5:

The difference between the triphenyl waste gas adsorption liquid described in this implementation and Example 1 is that the Freon recovery liquid in the emulsion: N-formylmorpholine = 0.9:0.1; it is simulated in the laboratory, and its absorption effect is shown in Table 1 .

Embodiment 6:

The difference between the triphenyl waste gas adsorption liquid described in this implementation and Example 1 is that the Freon recovery liquid in the emulsion: N-formylmorpholine=0.4:0.6; it is simulated in the laboratory, and its absorption effect is shown in Table 1 .

Embodiment 7:

The difference between the triphenyl waste gas adsorption liquid described in this implementation and Example 1 is that the Freon recovery liquid in the emulsion: N-formylmorpholine=0.3:0.7; it is simulated in the laboratory, and its absorption effect is shown in Table 1 .

Embodiment 8:

The difference between the triphenyl waste gas adsorption solution described in this implementation and Example 1 is that the Freon recovery solution in the emulsion: N-formylmorpholine=0.2:0.8, simulated in the laboratory, and its absorption effect is shown in Table 1 .

Embodiment 9:

The difference between the triphenyl waste gas adsorption solution described in this implementation and Example 1 is that Freon in the emulsion: N-formylmorpholine = 0.1:0.9; it was simulated in the laboratory, and its absorption effect is shown in Table 1.

Example 10:

The difference between the triphenyl exhaust gas adsorption solution described in this implementation and Example 1 is that Freon: N-formylmorpholine in the emulsion = 1:0; it was simulated in the laboratory, and its absorption effect is shown in Table 1.

Example 11:

The difference between the triphenyl waste gas adsorption liquid described in this implementation and Example 1 is that the Freon recovery liquid in the emulsion: N-formylmorpholine = 0:1; it is simulated in the laboratory, and its absorption effect is shown in Table 1 .

Table 1: List of adsorption effects on simulated exhaust gas after changing the composition ratio in the emulsion

From the experimental results in Table 1, it can be seen that Freon and N-formylmorpholine have a mutual promotion effect on the adsorption process of triphenyl waste gas. At the same time, when the ratio of Freon and N-formylmorpholine is 1:1, the adsorption effect Preferably, when the ratio is 0.8-0.1:0.2-0.9, the absorption rate can reach more than 90% and the absorption effect is good.

Example 12:

The difference between the triphenyl exhaust gas adsorption liquid described in this implementation and the first embodiment is that the concentration of Freon in the emulsion is 35.6%; it was simulated in the laboratory, and its absorption effect is shown in Table II.

Example 13:

The difference between the triphenyl exhaust gas adsorption liquid described in this implementation and the first embodiment is that the concentration of Freon in the emulsion is 40.0%; it was simulated in the laboratory, and its absorption effect is shown in Table II.

Table 2: List of adsorption effects on simulated exhaust gas after changing the concentration of Freon

From the experimental results in Table 2, it can be seen that the higher the concentration of Freon in the Freon recovery solution, the better the adsorption effect on waste gas.

Claims (4)

1. a triphenyl waste gas adsorption liquid, is characterized in that, described adsorption liquid comprises emulsion, tensio-active agent, sodium carboxymethyl cellulose and water; Described emulsion comprises Freon and N-formylmorpholine ; In the emulsion, by volume ratio: Freon: N-formylmorpholine = 0.01-0.5: 0.9-0.1; The components in the adsorption liquid are by mass: 13-23 parts of emulsion, 1-2 parts of surfactant, 1-3 parts of sodium carboxymethyl cellulose, and 7500-8500 parts of water. 2. The triphenyl exhaust gas adsorption liquid as claimed in claim 1, wherein said surfactant comprises fatty acid glycerides, sucrose fatty acid esters or a mixture of the two. 3. triphenyl waste gas adsorption liquid as claimed in claim 1, is characterized in that, described emulsion comprises freon recovery liquid and N-formylmorpholine, and described freon recovery liquid is the waste liquid after collecting air conditioner refrigeration The mass percentage of freon in the freon recovery solution is 30%-50%. According to the volume ratio, the freon recovery solution: N-formylmorpholine=0.1-0.9:0.9-0.1. 4. The application of the triphenyl waste gas adsorption liquid described in claim 1, 2 or 3 in the adsorption of triphenyl waste gas.