A cleaning agent for restoring the microscopic specific surface area of a deactivated denitration catalyst
By using cleaning agents composed of ethanolamine, surfactants, nonionic surfactants and foam defoamers, the problem of limited microscopic specific surface area recovery effect of SCR denitrification catalysts in the prior art is solved, and efficient catalyst recovery and cost savings are achieved.
Patent Information
- Application Number
- CN202411949735.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-04-08
AI Technical Summary
The prior art has limited effect when restoring the microscopic specific surface area of the deactivated SCR denitrification catalyst, increasing costs and wastewater treatment pressure, and negatively affecting the catalyst, such as reduced mechanical strength and increased alkali metals in chemical composition.
A cleaning agent is provided, which components include ethanolamine, surfactants, nonionic surfactants and foam defoamers, prepared by specific proportioning and stirring steps for cleaning the catalyst.
The recovery rate of the microscopic specific surface area of the inactivated SCR denitrification catalyst is improved, labor costs are saved, and the through-hole efficiency of the catalyst is improved without destroying the catalyst, with significant economic and recovery effects.
Smart Images
Figure CN119771513A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of environmental protection, and in particular to a cleaning agent for restoring the microscopic specific surface area of a deactivated denitration catalyst. Background Art
[0002] During the reuse of SCR denitration catalyst (hereinafter referred to as catalyst), the catalyst will become deactivated over time, resulting in flue gas emissions failing to meet national standards. Catalyst regeneration is currently the most economical and environmentally friendly treatment method; the deactivated catalyst is treated through physical treatment, chemical cleaning, and active impregnation to restore its activity.
[0003] In actual applications, although chemical cleaning can restore the microscopic specific surface area of the SCR denitration catalyst, the effect is very limited. To further improve the recovery effect, it will increase the cost and pressure of sewage treatment, and it will also have certain negative effects on the catalyst, such as reduced mechanical strength and increased alkali metals in the chemical composition. In addition, artificial through-holes are currently used to restore the microscopic specific surface area of the SCR denitration catalyst, but this will greatly increase labor costs, and the catalyst body will be damaged during the through-hole process, affecting the performance and service life of the catalyst.
[0004] Therefore, it is particularly important to restore the microscopic specific surface area of the SCR deNOx catalyst in a more economical and environmentally friendly way. Summary of the invention
[0005] In order to solve the above technical problems, a technical solution adopted by the present invention is: Provided is a cleaning agent for restoring the microscopic specific surface area of a deactivated denitration catalyst, the cleaning agent comprising ethanolamine, a surfactant, a nonionic surfactant and a defoaming agent. The weight proportions of the components are 40-60 parts of ethanolamine, 15-35 parts of surfactant, 20-30 parts of nonionic surfactant and 8-10 parts of defoaming agent.
[0006] In a preferred embodiment of the present invention, the ethanolamine includes one or more of triethanolamine, monoethanolamine, diethanolamine or tetraethanolamine.
[0007] In a preferred embodiment of the present invention, the surfactant includes one or more of JFC surfactant, AEO-9, NPEO or Peregal.
[0008] In a preferred embodiment of the present invention, the nonionic surfactant includes one or more of fatty alcohol polyoxyethylene ether, fatty alcohol polyoxyethylene ether or X-100.
[0009] In a preferred embodiment of the present invention, the preparation steps of the cleaning agent include: heating pure water to 60°C; adding 40-60 parts by weight of ethanolamine, 15-35 parts by weight of surfactant, and 20-30 parts by weight of non-ionic surfactant into the water, stirring for 2 hours; and finally stirring 8-10 parts of defoaming agent for half an hour.
[0010] The beneficial effects of the present invention are: not only the recovery rate of the microscopic specific surface area of the deactivated SCR denitration catalyst is improved, but also the through-hole efficiency of the catalyst can be improved without destroying the catalyst itself, a large amount of labor costs is saved, and it has significant economy and recovery effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which: Figure 1 This is a test experiment diagram of a preferred embodiment of a cleaning agent for restoring the microscopic specific surface area of a deactivated denitration catalyst according to the present invention. DETAILED DESCRIPTION
[0012] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0013] See also Figure 1 , the embodiment of the present invention includes: A cleaning agent for restoring the microscopic specific surface area of a deactivated denitration catalyst to solve the problem of catalyst pore blocking. The cleaning agent comprises triethanolamine, a JFC surfactant, X-100 and a defoamer. The weight proportions of the components are 40-60 parts of triethanolamine, 15-35 parts of JFC surfactant, 20-30 parts of X-100 and 8-10 parts of the defoamer.
[0014] Preparation process: Use pure water, first heat the pure water to 60°C; add 40-60 parts by weight of triethanolamine, 15-35 parts by weight of JFC surfactant, and 20-30 parts by weight of X-100 into the water, and stir for 2 hours; finally, add 8-10 parts of defoaming agent and stir for half an hour.
[0015] Application process: put the cleaning agent into the chemical cleaning tank for chemical cleaning. It is mainly used in the cleaning process of SCR denitration catalyst regeneration process.
[0016] Three catalysts of different qualities were selected for cleaning test experiments. The specific surface areas of the three catalysts were 40, 41, and 41, respectively.
[0017] Experiment 1 According to the cleaning process: physical cleaning----bubble water washing----pure water rinsing---drying, without adding cleaning agent, the specific surface areas of the three catalysts after cleaning are 46, 47, and 45 respectively.
[0018] Cleaning process: physical cleaning----bubble water washing----chemical cleaning----pure water rinsing---drying Experiment 2 According to the cleaning process: physical cleaning----bubbling water washing----chemical cleaning----pure water rinsing---drying, the components of the cleaning agent and the weight proportions of each component include: 40 parts of triethanolamine, 20 parts of JFC surfactant, 20 parts of X-100, and 10 parts of defoaming agent.
[0019] After testing, the specific surface areas of the three catalysts after cleaning were 48, 48, and 50 respectively.
[0020] Experiment 3 According to the cleaning process: physical cleaning----bubbling water washing----chemical cleaning----pure water rinsing---drying, the components of the cleaning agent and the weight proportions of each component include: 60 parts of triethanolamine, 25 parts of JFC surfactant, 20 parts of X-100, and 8 parts of defoaming agent.
[0021] After testing, the specific surface areas of the three catalysts after cleaning were 50, 51, and 53 respectively.
[0022] Tests have shown that the use of cleaning agents can effectively increase the recovery rate of the specific surface area of the catalyst, all of which meet the national standards for honeycomb catalysts.
[0023] The beneficial effects of the cleaning agent for restoring the microscopic specific surface area of the deactivated denitration catalyst of the present invention are: 1. Improve the recovery rate and recovery effect of the microscopic specific surface area of the deactivated SCR denitration catalyst; 2. It saves a lot of labor costs and improves the through-hole efficiency of the catalyst without damaging the catalyst itself, which has significant economic and recovery effects.
[0024] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.
Claims
1. A cleaning agent for restoring the microscopic specific surface area of a deactivated denitration catalyst, characterized in that: The components include ethanolamine, surfactant, nonionic surfactant and defoamer. The weight proportions of the components are 40-60 parts of ethanolamine, 15-35 parts of surfactant, 20-30 parts of nonionic surfactant and 8-10 parts of defoaming agent.
2. A cleaning agent for restoring the microscopic specific surface area of a deactivated denitration catalyst according to claim 1, characterized in that: The ethanolamine includes one or more of triethanolamine, monoethanolamine, diethanolamine or tetraethanolamine.
3. A cleaning agent for restoring the microscopic specific surface area of a deactivated denitration catalyst according to claim 1, characterized in that: The surfactant includes one or more of JFC surfactant, AEO-9, NPEO or Peregal.
4. A cleaning agent for restoring the microscopic specific surface area of a deactivated denitration catalyst according to claim 1, characterized in that: The nonionic surfactant includes one or more of fatty alcohol polyoxyethylene ether, fatty alcohol polyoxyethylene ether or X-100.
5. The cleaning agent for restoring the microscopic specific surface area of a deactivated denitration catalyst according to claim 1, characterized in that: The preparation steps of the cleaning agent include: heating pure water to 60°C; adding 40-60 parts by weight of ethanolamine, 15-35 parts by weight of surfactant, and 20-30 parts by weight of non-ionic surfactant into the water, stirring for 2 hours; and finally stirring 8-10 parts by weight of defoaming agent for half an hour.