Carbon dioxide adsorbent with low energy consumption and long service life and preparation method thereof

Abstract

The invention discloses a carbon dioxide adsorbent with low energy consumption and long service life and a preparation method thereof, and the carbon dioxide adsorbent comprises the following components: 8-12% of ethanolamine, 5-7% of N-methyldiethanolamine, 18% of N-methylmonoethanolamine, 51-55% of hydroxyethyl ethylenediamine and 12-14% of diisopropanolamine. The preparation method comprises the following steps: firstly, conveying ethanolamine, N-methyldiethanolamine, N-methylmonoethanolamine, hydroxyethyl ethylenediamine and diisopropanolamine into a reaction kettle through a feeding pump and a feeding pipe according to a proportion, heating materials in the reaction kettle to carry out chemical reaction, and continuously stirring by adopting a variable-frequency speed-regulating stirrer, so that the materials in the reaction kettle are fully mixed; and after the mixing is finished, the carbon dioxide adsorbent with low energy consumption and long service life in the reaction kettle is output through a discharge pipe under the action of a discharge pump. The prepared carbon dioxide adsorbent has the advantages of high absorption efficiency, long service life, low energy consumption, low loss and the like.

Description

Technical Field

[0001] The present invention relates to the field of carbon dioxide capture, and particularly to a carbon dioxide adsorbent with low energy consumption and long service life and a preparation method thereof. Background Art

[0002] Monoethanolamine is one of the materials suitable for use as an adsorbent in nature. It has a relatively fast absorption rate and a low price, so it is widely used in the absorption process of carbon dioxide in the power industry. However, it has high desorption energy consumption and a short service life, and it can be miscible with water, ethanol, acetone, etc.

[0003] However, the short service life and high energy consumption of ethanolamine have always been difficult problems. In order to improve its stability, service life, reduce energy consumption and its own loss, a carbon dioxide adsorbent with lower energy consumption and longer service life has been successfully designed. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a carbon dioxide adsorbent with low energy consumption and long service life and a preparation method thereof, which can reduce energy consumption and extend the service life of the adsorbent.

[0005] The technical solution of the present invention is as follows:

[0006] A carbon dioxide adsorbent with low energy consumption and long service life, comprising the following components: 8-12% of ethanolamine, 5-7% of N-methyldiethanolamine, 18% of N-methylmonoethanolamine, 51-55% of hydroxyethyl ethylenediamine, and 12-14% of diisopropanolamine.

[0007] Preferably, the carbon dioxide adsorbent is composed of 10% of ethanolamine, 5% of N-methyldiethanolamine, 18% of N-methylmonoethanolamine, 53% of hydroxyethyl ethylenediamine, and 14% of diisopropanolamine.

[0008] The preparation method of the above-mentioned carbon dioxide adsorbent with low energy consumption and long service life comprises the following steps:

[0009] S1. Ethanolamine, N-methyldiethanolamine, N-methylmonoethanolamine, hydroxyethyl ethylenediamine, and diisopropanolamine are transported to a reaction kettle through a feed pipe by a feed pump according to a ratio;

[0010] S2. The materials in the reaction kettle are subjected to a chemical reaction by heating, and at the same time, a stirrer with variable frequency speed regulation is used to continuously stir, so that the materials in the reaction kettle are fully mixed to obtain a carbon dioxide adsorbent with low energy consumption and long service life;

[0011] S3. After mixing is completed, the carbon dioxide adsorbent with low energy consumption and long service life in the reaction kettle is output through an outlet pipe under the action of an outlet pump.

[0012] Among them, the ethanolamine, N-methyldiethanolamine, N-methylmonoethanolamine, hydroxyethyl ethylenediamine, and diisopropanolamine are transported from the warehouse to the raw material weighing area by forklift, weighed according to the respective ratios, and then fed.

[0013] Among them, the raw material weighing area weighs the raw materials by a high-precision weighbridge.

[0014] Among them, the reaction kettle adopts a glass-lined reaction kettle.

[0015] Among them, the feed pipe and the discharge pipe are made of polytetrafluoroethylene.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: A carbon dioxide adsorbent prepared by the present invention has low energy consumption and long life, and has the advantages of fast absorption efficiency, long life, low energy consumption, and low loss. Specific embodiments

[0017] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0018] In order to illustrate the technical solutions described in the present invention, the following will be illustrated by specific examples.

[0019] Example 1

[0020] This example provides a carbon dioxide adsorbent with low energy consumption and long life, which is composed of 8% ethanolamine, 5% N-methyldiethanolamine, 18% N-methylmonoethanolamine, 55% hydroxyethyl ethylenediamine, and 14% diisopropanolamine.

[0021] Example 2

[0022] This example provides a carbon dioxide adsorbent with low energy consumption and long life, which is composed of 12% ethanolamine, 5% N-methyldiethanolamine, 18% N-methylmonoethanolamine, 51% hydroxyethyl ethylenediamine, and 14% diisopropanolamine.

[0023] Example 3

[0024] This example provides a carbon dioxide adsorbent with low energy consumption and long life, which is composed of 10% ethanolamine, 5% N-methyldiethanolamine, 18% N-methylmonoethanolamine, 55% hydroxyethyl ethylenediamine, and 12% diisopropanolamine.

[0025] Example 4

[0026] This embodiment provides a carbon dioxide adsorbent with low energy consumption and long lifespan, which is composed of 10% ethanolamine, 7% N-methyldiethanolamine, 18% N-methylmonoethanolamine, 51% hydroxyethyl ethylenediamine, and 14% diisopropanolamine.

[0027] Example 5

[0028] This embodiment provides a carbon dioxide adsorbent with low energy consumption and long lifespan, which is composed of 10% ethanolamine, 5% N-methyldiethanolamine, 18% N-methylmonoethanolamine, 53% hydroxyethyl ethylenediamine, and 14% diisopropanolamine.

[0029] Ethanolamine, also known as 2-hydroxyethylamine, with the chemical formula C2H7NO and a molecular weight of 61.083, has fast absorption and desorption rates and a low price. It is an adsorbent for capturing carbon dioxide.

[0030] N-methyldiethanolamine, with the chemical formula C5H13NO2 and a molecular weight of 119.162, is an adsorbent for capturing carbon dioxide. It is weakly basic and can neutralize acidic substances on the metal surface to form a protective oxide film, thereby slowing down the corrosion rate of the metal. It is soluble in water, ethanol, ketones, etc., and is often used as an emulsifier to make the mixture more stable and have a longer lifespan.

[0031] N-methylmonoethanolamine, with the chemical formula C3H9NO and a molecular weight of 75.1097, is soluble in water, ethanol, ketones, etc., and is often used as an emulsifier to make the mixture more stable and have a longer lifespan.

[0032] Hydroxyethyl ethylenediamine, with the molecular formula C4H12N2O and a molecular weight of 104.15, can absorb carbon dioxide and water from the air. It has lower volatility than ethylenediamine and a longer lifespan than ethylenediamine. It is alkaline and its toxicity is 6 - 7 times lower than that of ethylenediamine.

[0033] Diisopropanolamine, with the chemical formula C6H15NO2 and a molecular weight of 133.189, is miscible with water, miscible with ethanol, and slightly soluble in toluene. It is mainly used as an emulsifier to make the mixture more stable and have a longer lifespan.

[0034] Comparative example

[0035] This comparative example provides a carbon dioxide adsorbent, which is composed of 5% N-methyldiethanolamine, 18% N-methylmonoethanolamine, 67% hydroxyethyl ethylenediamine, and 14% diisopropanolamine.

[0036] Experiments show that:

[0037] Sample Steam consumption per ton of carbon dioxide Number of operating days Example 1 2.62 123 Example 2 2.84 122 Example 3 2.76 103 Example 4 2.64 125 Example 5 2.24 180 Comparative example 2.68 78

[0038] Conclusion: The carbon dioxide adsorbents obtained in Examples 1 to 5 have the advantages of low energy consumption and long lifespan compared to the Comparative Examples, among which Example 5 is the optimal one.

[0039] A preparation method of a carbon dioxide adsorbent with low energy consumption and long lifespan for Examples 1 to 5, which is specifically prepared through the following steps:

[0040] S1. Ethanolamine, N-methyldiethanolamine, N-methylmonoethanolamine, hydroxyethyl ethylenediamine, and diisopropanolamine are transported to the reaction kettle through the feed pipe by a feed pump in proportion.

[0041] Among them, raw materials such as ethanolamine, N-methyldiethanolamine, N-methylmonoethanolamine, hydroxyethyl ethylenediamine, and diisopropanolamine are transported out of the warehouse by a forklift to the raw material weighing area, weighed according to each ratio, and then fed.

[0042] Preferably, the raw material weighing area weighs the raw materials by a high-precision weighing scale, which can ensure accurate batching strictly according to the process formula and reduce human error.

[0043] Among them, the feed pipe is preferably made of polytetrafluoroethylene material, which has the characteristic of corrosion resistance.

[0044] S2. The materials in the reaction kettle undergo a chemical reaction by heating, and at the same time, a stirrer with variable frequency speed regulation continuously stirs, so that the materials in the reaction kettle are fully mixed to obtain a carbon dioxide adsorbent with low energy consumption and long lifespan.

[0045] Among them, the reaction kettle uses a pressure sensor, a temperature sensor, and a stirring rate sensor to comprehensively and real-time monitor the temperature, pressure, and stirring rate during the reaction process to ensure the stability and safety of the reaction.

[0046] Preferably, the reaction kettle is a glass-lined reaction kettle, which has excellent corrosion resistance and can effectively resist the erosion of amine liquid and various raw materials.

[0047] S3. After mixing is completed, the carbon dioxide adsorbent with low energy consumption and long lifespan in the reaction kettle is output to the finished product storage tank or ton barrel through the discharge pipe under the action of a discharge pump.

[0048] Among them, the discharge pipe is preferably made of polytetrafluoroethylene material, which has the characteristic of corrosion resistance.

[0049] The above is only the preferred embodiment of the present invention and is not used to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A carbon dioxide adsorbent with low energy consumption and long lifespan, characterized in that, It includes the following components: 8-12% ethanolamine, 5-7% N-methyldiethanolamine, 18% N-methylmonoethanolamine, 51-55% hydroxyethyl ethylenediamine, and 12-14% diisopropanolamine.

2. The carbon dioxide adsorbent with low energy consumption and long service life according to claim 1, characterized in that: This carbon dioxide adsorbent is composed of 10% ethanolamine, 5% N-methyldiethanolamine, 18% N-methylmonoethanolamine, 53% hydroxyethyl ethylenediamine, and 14% diisopropanolamine.

3. The preparation method of a carbon dioxide adsorbent with low energy consumption and long service life according to claim 1 or 2, characterized in that, It includes the following steps: S1. Ethanolamine, N-methyldiethanolamine, N-methylmonoethanolamine, hydroxyethyl ethylenediamine, and diisopropanolamine are transported to the reaction kettle through the feed pipe by a feed pump according to the ratio. S2. The materials in the reaction kettle undergo a chemical reaction by heating, and at the same time, a stirrer with variable frequency speed regulation continuously stirs to make the materials in the reaction kettle fully mixed to obtain a carbon dioxide adsorbent with low energy consumption and long service life. S3. After the mixing is completed, the carbon dioxide adsorbent with low energy consumption and long service life in the reaction kettle is output through the discharge pipe under the action of a discharge pump.

4. The preparation method of a carbon dioxide adsorbent with low energy consumption and long lifespan according to claim 3, characterized in that: The ethanolamine, N-methyldiethanolamine, N-methylmonoethanolamine, hydroxyethyl ethylenediamine, and diisopropanolamine are transported out of the warehouse by a forklift to the raw material weighing area, weighed according to each ratio, and then fed.

5. The preparation method of a carbon dioxide adsorbent with low energy consumption and long service life according to claim 3, characterized in that: The raw material weighing area weighs the raw materials by a high-precision weighing scale.

6. The preparation method of a carbon dioxide adsorbent with low energy consumption and long service life according to claim 3, characterized in that: The reaction kettle uses a glass-lined reaction kettle.

7. The preparation method of a carbon dioxide adsorbent with low energy consumption and long service life according to claim 3, characterized in that: The feed pipe and the discharge pipe are made of polytetrafluoroethylene.