阅读说明：本技术 一种高温烟气脱氯剂及其制备方法 (High-temperature flue gas dechlorinating agent and preparation method thereof ) 是由 李博 廖奕鸥 巩小敏 倪雪梅 于 2018-06-25 设计创作，主要内容包括：本发明属于催化剂制备技术领域,具体涉及一种高温烟气脱氯剂及其制备方法。包括碱改性铝基粉体,活性组分和添加剂,其中,所述碱改性铝基粉体是将铝基粉体通过碱性溶液浸渍改性得到。采用碱改性后的铝基粉体能够有效避免金属之间的团聚效应。通过对脱氯剂中各组分和用量的优化,使得本发明提供的高温烟气脱氯剂能够在500℃的高温下使用,使用后不会发生板结和强度下降,且脱氯活性和精度高。(The invention belongs to the technical field of catalyst preparation, and particularly relates to a high-temperature flue gas dechlorinating agent and a preparation method thereof. The alkali-modified aluminum-based powder is prepared by impregnating and modifying aluminum-based powder with an alkaline solution. The aluminum-based powder modified by alkali can effectively avoid the agglomeration effect among metals. By optimizing the components and the dosage in the dechlorinating agent, the high-temperature flue gas dechlorinating agent provided by the invention can be used at a high temperature of 500 ℃, hardening and strength reduction can not occur after the high-temperature flue gas dechlorinating agent is used, and the dechlorinating activity and the dechlorinating precision are high.)

1. The high-temperature flue gas dechlorinating agent is characterized by comprising alkali modified aluminum-based powder, an active component and an additive, wherein the alkali modified aluminum-based powder is obtained by soaking and modifying the aluminum-based powder through an alkaline solution.

2. The high-temperature flue gas dechlorination agent according to claim 1, wherein the alkaline reagent is selected from at least one of an alkali metal salt or an alkali metal hydroxide;

preferably, the material is at least one selected from potassium hydroxide, potassium carbonate, sodium acetate, sodium carbonate, potassium acetate, sodium hydroxide and sodium bicarbonate.

3. The high-temperature flue gas dechlorination agent according to claim 1, wherein the active component is selected from at least one of calcium hydroxide, calcium carbonate, calcium oxide, magnesium carbonate or magnesium oxide.

4. The high-temperature flue gas dechlorination agent according to claim 1, wherein the aluminum-based powder is at least one of aluminum hydroxide or activated alumina.

5. The high-temperature flue gas dechlorination agent according to any one of claims 1 to 4, wherein the additive is a pore former and/or a binder, wherein,

the pore-forming agent is selected from at least one of carbon powder, starch, attapulgite or sucrose powder;

the binder is at least one selected from sodium carboxymethyl cellulose, silica sol or water.

6. The high-temperature flue gas dechlorinating agent according to any one of claims 1 to 4, which comprises, by weight, 25 to 40 parts of alkali-modified aluminum-based powder, 30 to 45 parts of an active component, and 15 to 30 parts of an additive.

7. The high-temperature flue gas dechlorination agent according to claim 6, wherein the weight ratio of the pore-forming agent to the binder in the additive is 1: (1-8).

8. The preparation method of the high-temperature flue gas dechlorinating agent according to any one of claims 1 to 7, characterized by comprising the following steps:

alkali modification: dissolving an alkaline reagent in water to obtain an alkaline solution, mixing the alkaline solution with the aluminum-based powder, stirring for 1-3h, filtering, and roasting a filter cake at the temperature of 300-;

kneading and molding: and mixing the alkali modified aluminum-based powder with an active component and an additive, performing wet mixing extrusion molding, drying and roasting to obtain the high-temperature flue gas dechlorinating agent.

9. The preparation method of the high-temperature flue gas dechlorinating agent according to claim 8, wherein the mass concentration of the alkaline solution is 3-15 wt%.

10. The preparation method of the high-temperature flue gas dechlorinating agent according to claim 8 or 9, wherein the drying temperature in the kneading and molding step is 60-100 ℃, and the drying time is 1-3 h;

and/or the roasting temperature in the kneading and molding step is 300-600 ℃, and the roasting time is 3-6 h.

Technical Field

The invention belongs to the technical field of catalyst preparation, and particularly relates to a high-temperature flue gas dechlorinating agent and a preparation method thereof.

Background

As the exploitation amount of crude oil in China is reduced year by year, part of crude oil needs to be imported from foreign countries every year, but the chlorine content in foreign oil products is high. Meanwhile, organic chlorine is often required to be added in the crude oil processing process, for example, in a continuous reforming process, chlorine in the catalyst is continuously consumed and lost in the reforming reaction process, and chlorine is required to be continuously added to ensure the acidity and the activity of the catalyst so as to keep the activity of the catalyst. The self-contained and added chloride in the oil product can generate HCl at high temperature, the resultant can seriously corrode production equipment and pipelines thereof, meanwhile, downstream catalysts are influenced to poison the catalysts, and in addition, if the flue gas generated in the processing process is discharged into the air, the environment pollution can be caused. Therefore, the removal of the chloride has important significance for guaranteeing the normal production of enterprises, so that various dechlorinating agents can be produced at the same time.

At present, much force is put into research on dechlorinating agents at home and abroad, various patent technologies and reports are infinite, the dechlorinating agents are in the shapes of tablets, strips, spheres and the like, and are in the shapes of low-temperature, normal-temperature and high-temperature types, and products with different properties, such as T401 series, NC2301 series, KT407 series, NC series, WDL series, WGL series and the like, which are developed successively at home, and the chlorine capacity of the dechlorinating agents is 6-25%; the main products in foreign countries include U.S. UCI G-92, C117-1-2, C125-1, etc., UK ICI 52-1G, 59-3, etc., and German BASF R5-11, etc., and the chlorine capacity is 1% -12%. However, the use temperature of most of the dechlorinating agents is between 100 ℃ and 450 ℃, so that the dechlorinating agents cannot be used in the dechlorinating process of high-temperature flue gas with higher temperature, and the dechlorinating agents are easy to harden in a high-temperature state, have low dechlorinating activity and accuracy, cannot treat HCl with higher concentration and the like.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defects of easy hardening, low chlorine capacity, low dechlorination precision, small treatment capacity and the like of the high-temperature flue gas dechlorinating agent in the prior art, thereby providing the high-temperature flue gas dechlorinating agent and the preparation method thereof.

In order to solve the technical problems, the invention adopts the following technical scheme:

the high-temperature flue gas dechlorinating agent comprises alkali modified aluminum-based powder, an active component and an additive, wherein the alkali modified aluminum-based powder is obtained by dipping and modifying the aluminum-based powder through an alkaline solution.

Further, the alkaline agent is selected from at least one of alkali metal salt or alkali metal hydroxide;

preferably, the material is at least one selected from potassium hydroxide, potassium carbonate, sodium acetate, sodium hydroxide, sodium bicarbonate, potassium acetate or sodium carbonate.

Further, the active component is selected from at least one of calcium hydroxide, calcium carbonate, magnesium carbonate, calcium oxide or magnesium oxide.

Further, the aluminum-based powder is at least one of aluminum hydroxide or activated alumina.

Further, the additive is pore-forming agent and/or binder, wherein,

the pore-forming agent is selected from at least one of carbon powder, starch, attapulgite or sucrose powder;

the binder is at least one selected from sodium carboxymethyl cellulose, silica sol or water.

Further, the aluminum-based composite material comprises, by weight, 25-40 parts of alkali-modified aluminum-based powder, 30-45 parts of active components and 15-30 parts of additives.

Further, the weight ratio of the pore-forming agent to the binder in the additive is 1: (1-8).

The preparation method of the high-temperature flue gas dechlorinating agent comprises the following steps:

alkali modification: dissolving an alkaline reagent in water to obtain an alkaline solution, mixing the alkaline solution with the aluminum-based powder, stirring for 1-3h, filtering, and roasting a filter cake at the temperature of 300-;

kneading and molding: and mixing the alkali modified aluminum-based powder with an active component and an additive, performing wet mixing extrusion molding, drying and roasting to obtain the high-temperature flue gas dechlorinating agent.

Further, the mass concentration of the alkaline solution is 3-15 wt%.

Further, the drying temperature in the kneading and molding step is 60-100 ℃, and the drying time is 1-3 h;

and/or the roasting temperature in the kneading and molding step is 300-600 ℃, and the roasting time is 3-6 h.

The technical scheme of the invention has the following advantages:

1. the high-temperature flue gas dechlorinating agent provided by the invention comprises alkali modified aluminum-based powder, an active component and an additive, wherein the alkali modified aluminum-based powder is obtained by dipping and modifying the aluminum-based powder through an alkaline solution. The aluminum-based powder modified by alkali can effectively avoid the agglomeration effect among metals. By optimizing the components and the dosage in the dechlorinating agent, the high-temperature flue gas dechlorinating agent provided by the invention can be used at a high temperature of 500 ℃, hardening and strength reduction can not occur after the high-temperature flue gas dechlorinating agent is used, and the dechlorinating activity and the dechlorinating precision are high.

2. According to the preparation method of the high-temperature flue gas dechlorinating agent, provided by the invention, the aluminum-based powder is modified, so that alkali metal is dispersed more effectively, the use amount of the alkali metal is reduced, and the strength control during forming is facilitated. In addition, the preparation method is simple, convenient to operate and easy for large-scale production.

Detailed Description

The following examples are provided to further understand the present invention, not to limit the scope of the present invention, but to provide the best mode, not to limit the content and the protection scope of the present invention, and any product similar or similar to the present invention, which is obtained by combining the present invention with other prior art features, falls within the protection scope of the present invention.