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High-efficiency catalyst for purifying tail gas of adipic acid device, and forming technology method of catalyst

A molding process, adipic acid technology, applied in physical/chemical process catalysts, adipic acid production, nitrous oxide capture, etc., can solve the limitations of the development of adipic acid device tail gas purification technology, the catalyst cannot be directly formed and batched Production, difficult to meet the requirements of industrial shaped catalysts, etc., to achieve the effects of saving preparation time and cost, good economic applicability, and improving stability

Active Publication Date: 2016-12-07
CHINA TIANCHEN ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] So far, there is no mature tail gas purification technology of adipic acid plant in China, mainly in the catalytic decomposition of N 2 O high temperature of about 500-800 °C, it is difficult for the catalyst to maintain catalytic activity and stability during the production process, and the catalyst cannot be directly molded and mass-produced, resulting in high cost, which seriously limits the development of tail gas purification technology of adipic acid plant
The cobalt-aluminum composite oxide-supported gold catalyst (CN101376107) invented by Xu Xiufeng etc. has a good catalytic decomposition of N at medium and low temperatures. 2 The activity of O, but the noble metal load is large, expensive and poor in toxicity resistance
(CN102513117) invented the catalytic decomposition of N 2 The catalyst for O is a composite oxide composed of copper oxide and cerium oxide, which has good activity and stability, but this catalyst is a non-supported metal composite oxide catalyst, which is difficult to meet the requirements of industrial shaped catalysts.

Method used

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  • High-efficiency catalyst for purifying tail gas of adipic acid device, and forming technology method of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Directly shaped Rh-CoFe 2 o 4 / Al 2 o 3 catalyst:

[0036] (1) Co(NO 3 ) 2 , FeSO 4 , Fe 2 (SO 4 ) 3 and Rh(NO 3 ) 3 Dissolve in deionized water according to 1:2:0.5:0.05 (molar ratio) to obtain a metal salt solution with a total concentration of metal ions of 0.85M; the molar ratio is [OH - Total charge]: [metal ion charge total]=2.0 prepare lye, dissolve completely until the solution is transparent. The metal salt solution and the lye sub-channel are injected into the cyclone reactor at the same time, and after rapid reaction, the obtained colloidal slurry is transferred to the reaction kettle, and crystallized at 90° C. for 3 hours.

[0037] (2) Take a certain amount of colloidal slurry, add pseudo-boehmite, safflower powder and peptizer to the precursor slurry, and control the water-powder ratio of the total material to 0.65L Kg -1 , the mass ratio of safflower powder and pseudo-boehmite is 5%, stir evenly, age at room temperature for 2h, then knead, ex...

Embodiment 2

[0041] Directly formed CuO+ZnAl 2 o 4 / SiO 2 catalyst:

[0042] (1) Adding Cu(NO 3 ) 2 , Zn(NO 3 ) 2 with Al(NO 3 ) 3 Dissolve in deionized water at 1:1:1 (molar ratio) to obtain a metal salt solution with a total concentration of metal ions of 0.4M; press [NaOH]:[hexamethylenetetramine]:[NO 3 - ]=1:2:1 prepare lye, dissolve completely until the solution is transparent. The metal salt solution and the lye sub-channel are injected into a high-speed rotating cyclone reactor at the same time, and after rapid mixing, the obtained colloidal slurry is transferred to a reaction kettle and crystallized at 60° C. for 5 hours.

[0043] (2) Take a certain amount of colloidal slurry, add silica sol and squash powder to the precursor slurry, and control the water-powder ratio of the total material to 0.80L Kg -1 , the mass ratio of safflower powder and silica sol is 3%, stir evenly, age at room temperature for 3h, then knead, use extruder to extrude into a clover shape with a di...

Embodiment 3

[0047] Directly shaped CeO 2 +NiFe 2 o 4 / Al 2 o 3 catalyst:

[0048] (1) Ce(NO 3 ) 2 , Ni(NO 3 ) 2 with Fe(NO 3 ) 3 Dissolve in deionized water at 0.1:2:0.5 (molar ratio) to obtain a metal salt solution with a total concentration of 0.5M; press [NaOH]:[ammonia]:[NO 3 - ]=2:2:1 prepare lye, dissolve completely until the solution is transparent. The metal salt solution and the lye sub-channel are injected into a high-speed rotating cyclone reactor at the same time, and after rapid mixing, the obtained colloidal slurry is transferred to a reaction kettle, and crystallized at 120° C. for 3 hours.

[0049] (2) Take a certain amount of colloidal slurry, add sulfonated polystyrene and aluminum sol with a diameter of 1 μm to the precursor slurry, and control the water-powder ratio of the total material to 0.95L Kg -1 , the mass ratio of sulfonated polystyrene and aluminum sol is 0.5wt%, stir evenly, age at room temperature for 1h, then knead, extrude into a five-leaf clo...

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Abstract

The invention provides a high-efficiency catalyst for purifying tail gas of adipic acid device, and a forming technology method of the catalyst. The high-efficiency catalyst is prepared from the following components in percentage by mass: 80-90% of carrier skeletons, 5-20% of active components, and 0.1-5% of promoter, wherein the active components contain divalent metal elements and trivalent metal elements. The concentration of N2O in industrial waste gas can be efficiently reduced. In addition, the catalyst can be directly formed and produced in batches, thus providing effective guarantee for the industrial application of the catalyst.

Description

technical field [0001] The invention relates to a high-efficiency catalyst for purifying the tail gas of an adipic acid plant and its direct molding process, which belongs to the technical field of environmental protection catalytic materials and air pollution control, and specifically relates to a method for purifying the tail gas of an adipic acid plant N 2 O catalyst. Background technique [0002] N 2 O is more harmful to the ozone layer than chlorofluorocarbons, and its ability to cause the greenhouse effect is stronger than that of CO 2 310 times stronger. Moreover, this gas can persist in the atmosphere for up to 120 years, and its chemical properties are stable. Research shows that N 2 O has become the most important substance for the depletion of the ozone layer emitted by humans. Since the Industrial Revolution, atmospheric N 2 The content of O continues to increase, which mainly comes from the waste gas discharged from the production process of chemical produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/80B01J23/83B01J23/89B01D53/86B01D53/56
CPCB01D53/8628B01D2257/402B01J23/002B01J23/80B01J23/83B01J23/8913B01J37/0009B01J37/0211B01J37/0213B01J2523/00B01J2523/31B01J2523/821B01J2523/842B01J2523/845B01J2523/17B01J2523/27B01J2523/41B01J2523/3712B01J2523/847Y02C20/10Y02P20/30
Inventor 陈涛艾晓欣张丰扬王琳李亚楠江屿徐烨琨刘文杨琦武陈晨白世杰
Owner CHINA TIANCHEN ENG
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