Catalyst for catalyzing reduction of dilute nitric acid to prepare nitrites with alcohol, preparation method and application thereof

A technology of nitrite and dilute nitric acid is applied in the directions of nitrite preparation, physical/chemical process catalysts, chemical instruments and methods, and can solve the problems of high production cost of ethylene glycol, many production process equipment and high energy consumption, Achieving the effect of low price, lower production cost and lower reaction temperature

Active Publication Date: 2019-03-29
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, ethylene glycol is mainly synthesized by petrochemical technology: ethylene glycol is used as raw material, and ethylene glycol is prepared by direct hydration of ethylene oxide. However, this process requires evaporation of a large amount of water, high energy consumption, and many production process equipment, resulting in Alcohol production costs are high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The present embodiment catalyzes the reduction of dilute nitric acid with ethanol to prepare the components of ethyl nitrite catalyst and their contents (in terms of total catalyst mass) as shown in the following table:

[0025] Element

PD

carrier

content%

0.307

99.693

[0026] The present embodiment catalyzes the preparation method of ethyl nitrite catalyst by reducing dilute nitric acid with ethanol, and the specific process is as follows:

[0027] (1) Weigh 15g of activated carbon and place it in 0.5% nitric acid aqueous solution, heat it to 75°C in a water bath and continue to stir for 4h, wash it with deionized water for 4 times, then place it in a 90°C oven and dry it for 3h to obtain 14.880g of modified activated carbon carrier ;

[0028] (2) Take 0.300g Pd(NO 3 ) 2 The solution was dissolved in 15g deionized water, heated to 60°C in a water bath, and stirred for 30 minutes;

[0029] (3) The above solution was evenly added d...

Embodiment 2

[0031] The present embodiment catalyzes the reduction of dilute nitric acid with ethanol to prepare the components of ethyl nitrite catalyst and their contents (in terms of total catalyst mass) as shown in the following table:

[0032] Element

PD

CuO

CeO 2

MnO 2

ZrO 2

carrier

content%

0.307

0.198

0.100

0.101

0.101

99.192

[0033] The present embodiment catalyzes the preparation method of ethyl nitrite catalyst by reducing dilute nitric acid with ethanol, and the specific process is as follows:

[0034] (1) Weigh 15g of activated carbon and place it in 0.5% nitric acid aqueous solution, heat it to 75°C in a water bath and continue to stir for 4h, wash it with deionized water for 4 times, then place it in a 90°C oven and dry it for 3h to obtain 14.880g of modified activated carbon carrier ;

[0035] (2) Take 0.300g Pd(NO 3 ) 2 solution, 0.090g Cu(NO 3 ) 2 ·3H 2 O, 0.038g Ce(NO 3 ) 3 ·6H 2 O, 0.100g Mn(...

Embodiment 3

[0038] The present embodiment catalyzes the reduction of dilute nitric acid with ethanol to prepare the components of ethyl nitrite catalyst and their contents (in terms of total catalyst mass) as shown in the following table:

[0039] Element

PD

Pt

ZrO 2

CeO 2

MnO 2

carrier

content%

0.199

0.100

0.101

0.100

0.200

99.300

[0040] The present embodiment catalyzes the preparation method of ethyl nitrite catalyst by reducing dilute nitric acid with ethanol, and the specific process is as follows:

[0041] (1) Weighing 15g of activated carbon is placed in 0.5% nitric acid aqueous solution, heated to 75°C in a water bath and continuously stirred for 4h, washed 4 times with deionized water, and then dried in an oven at 90°C for 3h to obtain 14.890g modified activated carbon carrier ;

[0042] (2) Take 0.195g Pd(NO 3 ) 2 solution, 0.100g Pt(NO 3 ) 2 solution, 0.038g Ce(NO 3 ) 3 ·6H 2 O, 0.198g Mn(NO 3 ) 2 ·...

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PUM

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Abstract

The invention discloses a catalyst for catalyzing reduction of dilute nitric acid to prepare nitrites with alcohol, a preparation method and an application thereof, belonging to the technical field ofcoal chemical industry. The catalyst of the invention adopts activated carbon as a carrier, and is composed of a loaded main catalyst and a cocatalyst. The main catalyst is one or two or more components selected from Pt, Pd and Rh, and the cocatalyst is two or more components selected from La2O3, ZrO2, CeO2, CuO and MnO2. The invention also provides the preparation method and the application of the catalyst. The catalyst of the invention can catalyze and reduce the dilute nitric acid waste liquid generated in the process of coal-to-ethylene glycol to be nitrous acid, and then the nitrous acidreacts with alcohol to generate nitrite. Nitrite is an important intermediate in the production of ethylene glycol, so the utilization ratio of a nitrogen source can be improved, the discharge of waste acid liquid is reduced, the NaOH consumption of neutralizing waste liquid is reduced, further the production cost of ethylene glycol is reduced, the economic benefits of enterprises is improved, and a good prospect for industrial application is achieved.

Description

technical field [0001] The invention belongs to the field of catalysts, and relates to a catalytic material technology for the treatment of coal-based ethylene glycol waste acid liquid and the recycling of nitrogen resources, in particular to a catalyst for preparing nitrite by catalyzing the reduction of dilute nitric acid by alcohol, its preparation method and application. Background technique [0002] Ethylene glycol is an important bulk organic chemical raw material, mainly used in the production of antifreeze, nonionic surfactants and polycool fibers. At present, ethylene glycol is mainly synthesized by petrochemical technology: ethylene glycol is used as raw material, and ethylene glycol is prepared by direct hydration of ethylene oxide. However, this process requires evaporation of a large amount of water, high energy consumption, and many production process equipment, resulting in Alcohol production costs are high. With the development and application of coal chemic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J23/89B01J23/656C07C203/00C07C201/04
CPCB01J23/42B01J23/6562B01J23/8926C07C201/04C07C203/00
Inventor 宋元江李文龙王科李扬董玲玉王雪峰刘亚华
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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