Method for catalyzing urea hydrolysis by using nano aluminum oxide
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A technology for nano-alumina, catalyzing urea, applied in alumina/aluminum hydroxide, chemical instruments and methods, physical/chemical process catalysts, etc.
Pending Publication Date: 2021-07-30
SHANDONG ACAD OF CHINESE MEDICINE +1
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[0005] Aiming at the deficiencies of the prior art, the present invention provides a method for using nano-alumina to catalyze the hydrolysis of urea, which solves the problem of shortcomings in the homogeneous catalyst for urea catalysis and hydrolysis in the prior art
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Embodiment 1
[0021] The embodiment of the present invention provides a method for using nano-alumina to catalyze the hydrolysis of urea, which includes preparing nano-alumina, using nano-alumina as a catalyst, and performing urea catalytic hydrolysis in a hydrolysis reactor, and installing steam at the lower part of the hydrolysis reactor. Injection system.
[0022] Concrete hydrolysis method is as follows:
[0023] Step 1. Add acetone, 0,0'-bis(2-aminopropyl) polypropylene glycol-block-polyethylene glycol-block-polypropylene glycol, isooctyl alcohol and isopropanol at room temperature and under stirring conditions Aluminum, then add water dropwise, stir well, and after 2 hours, bake in an oven at 60°C for 12 hours, and bake the obtained gel in a horse-boiler furnace at 300°C for 4 hours, and heat up to 500°C. Calcined for 6 h to obtain nano-alumina;
[0024] Step 2. The dry urea granules are packed in the tank truck in bulk, and the tank truck is connected with the air pump, and the air...
Embodiment 2
[0028] The raw materials of each weight part of nano-alumina are: 13 parts of acetone, 14 parts of 0,0'-di(2-aminopropyl) polypropylene glycol-block-polyethylene glycol-block-polypropylene glycol, 6 parts of isooctanol 17 parts of aluminum isopropoxide and 26 parts of water.
Embodiment 3
[0030] The raw materials of each weight part of nano-alumina are: 15 parts of acetone, 14 parts of 0,0'-di(2-aminopropyl) polypropylene glycol-block-polyethylene glycol-block-polypropylene glycol, 5 parts of isooctanol 18 parts of aluminum isopropoxide and 25 parts of water.
[0031] The use data comparison of each embodiment nano-alumina
[0032] Catalytic time Catalytic cost (100 tons of urea) Can the catalyst be recycled? Embodiment one 12-14 hours 12100 yuan yes Embodiment two 12-13.5 hours 12325 yuan yes Embodiment Three 13-13.5 hours 12000 yuan yes Traditional catalytic comparison 16-16.5 hours 65000 yuan no
[0033] In summary, the embodiments of the present invention can effectively compress the catalysis time and catalysis cost, and the catalyst can be recycled to ensure further cost reduction, more environmental protection, and energy saving.
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Abstract
The invention provides a method for catalyzing urea hydrolysis by using nano aluminum oxide, and relates to the field of power plant flue gas denitration. The method for catalyzing urea hydrolysis by using nano-alumina comprises the following steps: preparing nano-alumina, carrying out urea catalytic hydrolysis reaction in a hydrolysis reactor by using nano-alumina as a catalyst, and installing a steam jet system at the lower part of the hydrolysis reactor. The technology has the following effects: water vapor is used as a steam stripping medium, gas generated by hydrolysis reaction is stripped out in time, the water vapor passes through a steam jet system, the turbulence degree of a urea solution is enhanced, gas-liquid mass transfer is enhanced, the generated gas is favorably discharged, and NH3 is prevented from being dissolved in water and a reverse reaction is prevented; and the high-speed gas fluid can disturb the suspended catalyst nano aluminum oxide in the hydrolyzer, so that the urea solution is in more sufficient contact with the catalyst, the catalytic hydrolysis reaction is facilitated, and the problems existing in a fixed bed reactor are solved.
Description
technical field [0001] The invention relates to the field of flue gas denitrification in power plants, in particular to a method for catalyzing the hydrolysis of urea by using nanometer alumina. Background technique [0002] The preparation of reducing agent for flue gas denitrification in thermal power plants is a very important link in the whole denitrification system. The most commonly used denitrification reducing agent in the denitrification system is NH 3 , and urea is an ideal source of ammonia. It is a synthetic non-toxic and odorless white crystal or powder. Its physical and chemical properties are relatively stable, and it is easy to transport in bulk and store for a long time. Urea is widely used in industrial and agricultural fields, and its use will not have adverse effects on personnel and surrounding residential areas. [0003] At present, most of the catalysts used in urea catalytic hydrolysis patents are homogeneous catalysts, such as the patent "Urea Cata...
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