Renewable flue gas desulfurization agent and preparation method thereof

A desulfurizing agent and flue gas technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve the problems of difficult by-product desulfurization gypsum, obstacles to the utilization of desulfurization gypsum, large one-time investment, etc., and achieve absorption and desorption. Appropriate process temperature difference, easy industrial production, and low desorption temperature

Active Publication Date: 2009-11-25
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the limestone-gypsum wet flue gas desulfurization process is the most mature and widely used SO2 technology in the world. 2 However, there are challenges of large one-time investment and the difficulty of processing the by-product desulfurization gypsum; because if desulfurization gypsum is directly landfilled, it will be subject to the limitation of available land and strict environmental regulations; if it is used to produce various As a retarder for building gypsum products and cement production, even if the calcium sulfite in desulfurized gypsum is converted into calcium sulfate through forced oxidation, the final results will be in free water content, fly ash content, soluble salt content, crystal particle size and shape, In terms of transportation distance between gypsum products and cement manufacturing plants, it is difficult to meet the strict quality and economic requirements put forward by users, which makes the utilization of desulfurized gypsum encounter great obstacles

Method used

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  • Renewable flue gas desulfurization agent and preparation method thereof
  • Renewable flue gas desulfurization agent and preparation method thereof
  • Renewable flue gas desulfurization agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation method of the renewable flue gas desulfurizer comprises the following steps:

[0027] A, the preparation of 1,4-two (2-hydroxypropyl) piperazine:

[0028] Add 34.4g of anhydrous piperazine into methanol at an equal mass temperature of 60°C. After completely dissolving, slowly add 46.5g of propylene oxide dropwise under condensing and reflux stirring, and the dropping time is ≥0.5h. After the dropwise addition, keep the temperature at 65-75°C to continue the reaction for 1.0h, then cool naturally to room temperature, a large amount of white needle-like crystals are precipitated, filter the filter cake, wash with 5.0ml of methanol three times, and dry in vacuum at 60°C for 3.0h, namely 1,4-Bis(2-hydroxypropyl)piperazine is obtained. Determination of the pKa of 1,4-bis(2-hydroxypropyl)piperazine conjugate acid at 25°C by potentiometric analysis 1 3.8, pKa 2 is 8.2.

[0029]

[0030] Anhydrous piperazine Propylene oxide 1,4-bis(2-hydroxypropyl)piperaz...

Embodiment 2

[0042] The reproducible 1,4-two (2-hydroxypropyl) piperazine mass fraction is 20% 1, the preparation method of the aqueous solution of 4-bis (2-hydroxypropyl) piperazine sulfate comprises the following steps:

[0043] A, the preparation of 1,4-two (2-hydroxypropyl) piperazine: with embodiment 1;

[0044] B, the preparation of 1,4-two (2-hydroxypropyl) piperazine sulfate aqueous solution:

[0045] Under stirring conditions, slowly add 2.2g of concentrated sulfuric acid dropwise to a beaker containing 33.8g of water, then slowly add 9.0g of 1,4-bis(2-hydroxypropyl)piperazine, and the solution obtained after completely dissolving is It is an aqueous solution of 1,4-bis(2-hydroxypropyl)piperazine sulfate with a mass fraction of 20% of 1,4-bis(2-hydroxypropyl)piperazine. Chemical reaction equation is with embodiment 1.

Embodiment 3

[0047] The reproducible 1,4-two (2-hydroxypropyl) piperazine mass fraction is 50% 1, the preparation method of the aqueous solution of 4-bis (2-hydroxypropyl) piperazine sulfate comprises the following operating steps:

[0048] A, the preparation of 1,4-two (2-hydroxypropyl) piperazine: with embodiment 1;

[0049] B, the preparation of 1,4-two (2-hydroxypropyl) piperazine sulfate aqueous solution:

[0050] Under stirring conditions, slowly add 5.5g of concentrated sulfuric acid dropwise to a beaker containing 17.0g of water, then slowly add 22.5g of 1,4-di(2-hydroxypropyl)piperazine, and the solution obtained after completely dissolving is It is an aqueous solution of 1,4-bis(2-hydroxypropyl)piperazine sulfate with a mass fraction of 1,4-bis(2-hydroxypropyl)piperazine of 50%. Chemical reaction equation is with embodiment 1.

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Abstract

The invention relates to a renewable flue gas desulfurization agent and the preparation method thereof. The flue gas desulfurization agent is the aqueous solution of 1,4-bis(2-hydroxypropyl) piperazinyl sulfate containing 30% of 1,4-bis(2-hydroxypropyl) piperazinyl by mass. The flue gas desulfurization can be prepared from the of 1,4-bis(2-hydroxypropyl) piperazinyl and other raw materials, by mixing according to a certain proportioning at normal temperature. Because the pKa1 of the conjugate acid of the 1,4-bis(2-hydroxypropyl) piperazinyl is 3.8, and the pKa2 of that is 8.2, the obtained flue gas desulfurization agent achieves the advantages of large absorbing capacity, high de-absorbing ratio, low de-absorbing temperature and suitable temperature difference in the absorbing and de-absorbing process; can reduce the energy consumption in absorbing and de-absorbing process obviously, and is very suitable for the application in process of removing SO2 in discharged flue gas in coal fired power plant and so on.

Description

technical field [0001] The present invention relates to SO2 in flue gas exhausted from coal-fired power plants etc. 2 Removed flue gas desulfurizer and preparation method. Background technique [0002] SO in flue gas 2 It is a harmful gas in the natural environment. It destroys the ecological balance through the formation of acid rain and endangers the living environment of human beings. At present, the limestone-gypsum wet flue gas desulfurization process is the most mature and widely used SO2 technology in the world. 2 However, there are challenges of large one-time investment and the difficulty of processing the by-product desulfurization gypsum; because if desulfurization gypsum is directly landfilled, it will be subject to the limitation of available land and strict environmental regulations; if it is used to produce various As a retarder for building gypsum products and cement production, even if the calcium sulfite in desulfurized gypsum is converted into calcium s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/50B01D53/14
Inventor 史成武刘清安崔鹏魏凤玉
Owner HEFEI UNIV OF TECH
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