Hybrid ionic liquid hydrate, preparation process and application thereof

A technology of ionic liquids and hydrates, applied in separation methods, other chemical processes, and separation of dispersed particles, can solve problems such as poor thermal stability and oxidation resistance, high viscosity of ionic liquids, and low efficiency of mass transfer and separation. Good oxidation resistance, fast mass transfer rate, high selective absorption effect

Inactive Publication Date: 2010-04-14
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, ionic liquids have been used as SO 2 Related patent reports on gas absorbents: For example, Chinese patent application No. 200510069406.6 uses alcohol amine carboxylate ionic liquid as SO 2 Gas absorbent, the cation is the cation of ethanolamine, diethanolamine, triethanolamine or diglycolamine protonated by hydrogen, and the anion is acetate or lactate; Chinese patent application number 200510073345.0 uses amino acid ionic liquid to absorb acid gas , the ionic liquid prepared by it has high cost, is not conducive to industrialization, and mainly absorbs CO 2 gas without SO 2 Gas absorption embodiment; Chinese patent application number is 200810025024.7 patent adopts dibasic acid salt ionic liquid of amine as SO 2 Gas absorbent, the cation is the cation of secondary or tertiary amine protonated by hydrogen, and the anion is dicarboxylic acid, but the viscosity of the ionic liquid is high, the efficiency of mass transfer and separation is low, and the thermal stability and oxidation resistance are relatively low. Poor, affecting its practical industrial application

Method used

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  • Hybrid ionic liquid hydrate, preparation process and application thereof
  • Hybrid ionic liquid hydrate, preparation process and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Synthesis of the succinate hybrid ionic liquid hydrate of N, N-methylethylimidazole and diethanolamine

[0022] Step 1. Make N,N-methylethylimidazolium bromide salt into a 50% aqueous solution and place it in the reaction kettle. Under the condition of ice-water bath, slowly add Ag 2 Suspension made of O powder and water, reacted for 6 hours under stirring, stood still, filtered to remove silver bromide precipitate, and obtained 213g of N,N-methylethylimidazole alkali aqueous solution, N,N-methylethylimidazole The mass concentration of alkali is 60%, and the yield is 98.5%.

[0023] Step 2. Take 213g of N,N-methylethylimidazole base aqueous solution with a mass concentration of 60%, place it in a reaction kettle, slowly add 118g (1mol) of succinic acid dropwise at room temperature, react under stirring for 3 hours, and let it stand place.

[0024] Step 3. Add 105 g (1 mol) of diethanolamine slowly to the reaction liquid after the reaction in step 2 at room ...

Embodiment 2

[0025] Embodiment 2: Synthesis of the maleate hybrid ionic liquid hydrate of N, N-methylbutylimidazole and N-methyldiethanolamine

[0026] Step 1, with 50% concentration of N, N-methyl butyl imidazole bromide saline solution, through domestic 717 type strong basic anion exchange resin ion exchange, obtain N, N-methyl butyl imidazole alkali aqueous solution 624g, N , the mass concentration of N-methylbutylimidazole base is 25%, and the yield is 99%.

[0027] Step 2, take 624g of N,N-methylbutylimidazole alkali aqueous solution with a mass concentration of 25%, place it in a reaction kettle, slowly add 116g (1mol) of maleic acid dropwise at room temperature, react under stirring for 5 hours, and statically place.

[0028] Step 3. Add 119g (1mol) of N-methyldiethanolamine slowly dropwise to the reaction liquid after the reaction in step 2 at room temperature, and react for 12 hours under stirring. After the reaction process is completed, most of the mixture is evaporated under v...

Embodiment 3

[0029] Embodiment 3: the hydrate synthesis of the malonate hybrid ionic liquid of N, N-methylethylimidazole and tributylamine

[0030] Step 1, make N,N-methylethylimidazolium bromide into a 50% aqueous solution and place it in the reaction kettle, and slowly add Ag in a trickle under the condition of an ice-water bath 2 Suspension made of O powder and water, reacted for 8 hours under stirring, stood still, filtered to remove silver bromide precipitate, and obtained 512g of N,N-methylethylimidazole alkali aqueous solution, N,N-methylethylimidazole The mass concentration of alkali is 25%, and the yield is 98%.

[0031] Step 2. Take 512g of N,N-methylethylimidazole alkali aqueous solution with a mass concentration of 25%, put it in a 2L reaction kettle, slowly add 104g (1mol) of malonic acid dropwise at room temperature, and react for 5 hours under stirring. stand still.

[0032] Step 3. In the reaction solution after the reaction in step 2, at normal temperature, slowly add 18...

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Abstract

Hybrid ionic liquid hydrate consists of two types of positive ions containing nitrogen and binary or polybasic carboxylate negative ions which are different in structure and property. One type of positive ions includes protonated alkylamine positive ions, and another type of positive ions inlcudes N,N-dialkyl imidazole positive ions or N, N-dialkyl pyrrole positive ions or N-alkyl pyridines positive ions or N, N, N, N-tetraalkyl ammonium positive ions. Positive ions at one end of binary acid or polybasic acid of the hybrid ionic liquid hydrate have faintly acid while positive ions at the other end are neutral, and binary or polybasic carboxylic acid negative ions have alkalescence, thereby enabling the hybrid ionic liquid hydrate to have ultra-strong pH buffer capacity and to be capable of reversibly absorbing or adsorbing SO2 gas in an environment-friendly high-efficient circulating form. The hybrid ionic liquid hydrate which is utilized as SO2 absorbent is simple in requirements to equipment for absorbing SO2, moderate in operation condition of absorbing and desorbing SO2 and high in desulfuration efficiency without problems of waste liquid and waste water discharge and the like. Further, the invention discloses a process for preparing the hybrid ionic liquid hydrate.

Description

technical field [0001] The present invention relates to SO 2 A hybrid ionic liquid hydrate separated by gas absorption or adsorption and a preparation method thereof. Background technique [0002] In recent years, the extensive use of coal and petroleum in industry has produced SO 2 , CO 2 And many other acid gases, seriously pollute the environment. Air polluted by sulfur dioxide not only causes local or global climate anomalies, but also directly threatens human health and social security. Therefore, how to economically and effectively control SO in coal-burning oil process and industrial flue gas 2 It is a key issue urgently needed to be solved in the field of energy and environment in our country and even in the world. [0003] At present, the flue gas desulfurization technology (FGD) that adopts post-combustion desulfurization schemes can be mainly divided into: 1. Wet flue gas desulfurization, such as limestone-gypsum method, seawater washing method, ammonia washi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D233/58C07D295/037C07D213/20C07C211/63C07C215/12C07C55/10C07C57/145C07C211/07C07C55/08C07C55/02C07C59/245C07C55/12C07C59/265B01D53/14B01J20/22
Inventor 吴有庭陶端健陆建锋周政张志炳
Owner NANJING UNIV
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