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Method for preparing a catalyst for decomposing isocyanic acid and method for using the prepared catalyst

A catalyst and isocyanic acid technology, applied in the field of decomposition and catalysis of isocyanic acid, can solve the problems that the production technical requirements cannot be met, the isocyanic acid cannot be decomposed and separated, and the catalyst preparation cost is high, and the decomposition and catalysis effect is good, and subsequent production is free. Influence, the effect of improving the catalytic efficiency of decomposition

Active Publication Date: 2021-03-16
SICHUAN MEIFENG CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing catalysts for the decomposition of isocyanic acid have the characteristics of easy pulverization. Not only the catalytic effect is not obvious, but also it is easy to cause blockage of subsequent production pipelines during production, and the isocyanic acid in the triamine tail gas cannot be effectively decomposed and separated. However, it cannot meet the production technical requirements of the low-pressure / normal-pressure gas-phase quenching process. In addition, the preparation cost of the existing catalysts for isocyanic acid decomposition is high, and the preparation of new catalysts and the development of application technologies are urgently needed.

Method used

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  • Method for preparing a catalyst for decomposing isocyanic acid and method for using the prepared catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A kind of preparation method of catalyst for decomposition of isocyanic acid, it comprises following sequential steps:

[0025] Step 1. Fire α-Al in a crucible with a resistance furnace at a temperature of 550°C 2 o 3 , and the firing time is 6 hours to obtain a catalytic carrier; store the catalytic carrier in a dry bottle for later use;

[0026] Step 2. 0.25g of Fe(NO 3 ) 3 Add it to 20mL of distilled water and shake it to dissolve; Fe(NO 3 ) 3 Fe in 2 o 3 The content is 5wt%;

[0027] Step 3. Add 0.95g of catalytic carrier to the solution in step 2, and soak for 1h;

[0028] Step 4. Ultrasonicate the impregnating solution in step 3 under the conditions of 50°C and 90W for 30min; then place it and then impregnate for 24h;

[0029] Step 5. Under the temperature condition of 80° C., the impregnation solution in step 4 is subjected to rotary evaporation to dryness to obtain the primary catalyst;

[0030] Step 6. Drying the primary catalyst product at a temperat...

Embodiment 2

[0035] A kind of preparation method of catalyst for decomposition of isocyanic acid, it comprises following sequential steps:

[0036] Step 1. Fire α-Al in a crucible with a resistance furnace at a temperature of 550°C 2 o 3 , and the firing time is 6 hours to obtain a catalytic carrier; store the catalytic carrier in a dry bottle for later use;

[0037] Step 2. 0.05g of Fe(NO 3 ) 3 Add it to 20mL of distilled water and shake it to dissolve; Fe(NO 3 ) 3 Fe in 2 o 3 The content is 5wt%;

[0038] Step 3. Add 0.95g of catalytic carrier to the solution in step 2, and soak for 1h;

[0039] Step 4. Ultrasonicate the impregnating solution in step 3 under the conditions of 60°C and 90W for 30min; then place it and then impregnate for 24h;

[0040] Step 5. Under the temperature condition of 90° C., the impregnation solution in step 4 is subjected to rotary evaporation to dryness to obtain the primary catalyst;

[0041] Step 6. Drying the primary catalyst product at a temperat...

Embodiment 3

[0046] A kind of preparation method of catalyst for decomposition of isocyanic acid, it comprises following sequential steps:

[0047] Step 1. Fire α-Al in a crucible with a resistance furnace at a temperature of 550°C 2 o 3 , and the firing time is 6 hours to obtain a catalytic carrier; store the catalytic carrier in a dry bottle for later use;

[0048] Step 2. 0.5g of Fe(NO 3 ) 3 Add it to 20mL of distilled water and shake it to dissolve; Fe(NO 3 ) 3 Fe in 2 o 3 The content is 5wt%;

[0049] Step 3. Add 0.95g of catalytic carrier to the solution in step 2, and soak for 1h;

[0050]Step 4. Ultrasonicate the impregnating solution in step 3 under the conditions of 70°C and 90W for 30min; then place it and then impregnate for 24h;

[0051] Step 5. Under the temperature condition of 60° C., the impregnation solution in step 4 is subjected to rotary evaporation to dryness to obtain the primary catalyst;

[0052] Step 6. Drying the primary catalyst product at a temperatur...

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Abstract

The invention discloses a preparation method for a catalyst used for decomposition of isocyanic acid and a using method of the prepared catalyst. The preparation method comprises the following steps:step 1, sintering alpha-Al2O3 for 6h by using a resistance furnace in a crucible under the temperature of 550 DEG C to obtain a catalytic carrier; and storing the catalytic carrier in a drying bottlefor standby; step 2, adding 0-0.5g of Fe(NO3)3 into 20mL of distilled water, and enabling the Fe(NO3)3 to be dissolved; step 3, adding 0.95g of the catalytic carrier into the solution obtained by thestep 2, and performing impregnation for 1h; step 4, performing ultrasonic treatment on the impregnated solution for 30min under conditions of 50-70 DEG C and 90W; and performing impregnation for 24h under placing; step 5, performing rotary evaporation treatment on the impregnated solution obtained by the step 4 under the temperature of 60-100 DEG C until the solution is dry to obtain an initial product of the catalyst; and step 6, drying the initial product of the catalyst under the temperature of 100 DEG C; then performing calcination for 5h under the temperature of 550 DEG C; and performingcooling, and performing drying to obtain the catalyst. The catalyst provided by the invention has good catalytic effects.

Description

technical field [0001] The invention relates to isocyanic acid decomposition catalytic technology, in particular to a method for preparing a catalyst for isocyanic acid decomposition, and a method for using the catalyst prepared by the preparation method. Background technique: [0002] As my country's low-pressure / atmospheric-pressure gas-phase quenching process for synthesizing melamine becomes increasingly mature, the domestic production capacity of melamine is gradually increasing, and currently accounts for 60% of the world's production capacity of melamine. In the production of melamine, a large amount of triamine tail gas will be discharged, and the triamine tail gas contains about 1% isocyanic acid (HCNO) gas; isocyanic acid is highly toxic and corrosive, and it will seriously affect the normal operation of subsequent process equipment run. Therefore, in the production of low-pressure / atmospheric-pressure gas-phase quenching process, the isocyanic acid contained in t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/745B01D53/54B01D53/56
CPCB01D53/8621B01D2255/20738B01D2255/2092B01D2257/40B01J23/745B01J37/0201B01J37/343
Inventor 陈晓陶家明黄泽翠刘心强郭明华李天华唐彬阮达
Owner SICHUAN MEIFENG CHEM IND