A kind of isobaric ammonia synthesis process

An ammonia synthesis and process technology, applied in the field of synthetic ammonia, can solve the problems of fluctuation and low concentration of ammonia at the outlet, and achieve the effects of high yield, high catalytic activity and improved hydration resistance.

Active Publication Date: 2019-04-23
FUZHOU UNIV ASSET MANAGEMENT CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the present invention is to overcome the defects of the existing low-pressure ammonia synthesis process that the outlet ammonia concentration is low and fluctuates greatly, and to provide an isobaric ammonia synthesis process that can increase the ammonia yield

Method used

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  • A kind of isobaric ammonia synthesis process
  • A kind of isobaric ammonia synthesis process

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Experimental program
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Embodiment 1

[0037] This embodiment provides a method for preparing the second ruthenium-based catalyst, comprising the steps of:

[0038] (1) Dissolve 20g of urea in 100g of water to form a nitrogen-containing solution, load the nitrogen-containing solution on magnesium-aluminum hydrotalcite with a magnesium-aluminum molar ratio of 0.6, heat and dry at 100°C, and Roasting in a nitrogen atmosphere at 190°C for 2 hours to obtain nitrogen-doped magnesium aluminum hydrotalcite, the doping amount of nitrogen element by mass is 5.5% of the mass of magnesium aluminum hydrotalcite;

[0039] (2) The above-mentioned nitrogen-doped magnesium aluminum hydrotalcite was heated to 630°C at a rate of 15°C / min and kept roasted for 1h, and then heated to 700°C at a rate of 3°C / min and kept roasted for 0.75h, and the roasted product It is the catalyst carrier, which contains 30v% spinel phase;

[0040] (3) Heating potassium fluorotantalate and sulfuric acid to above 400°C, and then diluting with water to u...

Embodiment 2

[0044] This embodiment provides a method for preparing the second ruthenium-based catalyst, comprising the steps of:

[0045] (1) Dissolve 15ml of ammonia water in 90ml of water to form a nitrogen-containing solution, and load the nitrogen-containing solution on magnesium-aluminum hydrotalcite with a magnesium-aluminum molar ratio of 1.7 by an equal-volume impregnation method, heat and dry at 80°C, and Roasting in an ammonia atmosphere at 200°C for 0.5h to obtain nitrogen-doped magnesium aluminum hydrotalcite, the doping amount of nitrogen element by mass is 8% of the mass of magnesium aluminum hydrotalcite;

[0046] (2) The above-mentioned nitrogen-doped magnesium aluminum hydrotalcite was heated to 600°C at a rate of 10°C / min and kept roasted for 3h, and then heated to 710°C at a rate of 5°C / min and kept roasted for 0.5h, and the roasted product It is the catalyst carrier, which contains 45v% spinel phase, and the pore radius distribution is in the range of 5-21nm;

[0047] (...

Embodiment 3

[0051] This embodiment provides a method for preparing the second ruthenium-based catalyst, comprising the steps of:

[0052] (1) 12ml of hydrazine hydrate was dissolved in 100ml of water to form a nitrogenous solution, and the nitrogenous solution was loaded on magnesium-aluminum hydrotalcite with a magnesium-aluminum molar ratio of 2.5 by an equal-volume impregnation method, heated and dried at 90°C, and Roasting in an ammonia atmosphere at 200° C. for 1 h to obtain nitrogen-doped magnesium aluminum hydrotalcite, the doping amount of nitrogen element by mass is 10% of the mass of magnesium aluminum hydrotalcite;

[0053] (2) The above-mentioned nitrogen-doped magnesium aluminum hydrotalcite was heated to 650°C at a rate of 5°C / min and kept roasted for 2h, and then heated to 720°C at a rate of 1°C / min and kept roasted for 0.5h, and the roasted product It is the catalyst carrier, which contains 37v% spinel phase;

[0054] (3) Heating potassium fluorotantalate and sulfuric aci...

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Abstract

The invention provides an isobaric ammonia synthesis process, which uses ammonia synthesis cycle gas and fresh H from the previous process. 2 and N 2 The mixed gas is used as the raw material gas, and the ammonia synthesis reaction is carried out under different process conditions in the presence of the first ruthenium-based catalyst and the second ruthenium-based catalyst. Through the cooperation of the two-stage reaction, the conversion rate of hydrogen and nitrogen and the ammonia recovery are greatly improved. rate, so that the ammonia net value in the outlet gas reaches 19.5-21.5%, not only the yield is high and the fluctuation is small; the whole process of the present invention is simple, the operating pressure is low, the ammonia net value is high, and the overall process flow and equipment investment of synthetic ammonia are greatly saved. It has good industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of ammonia synthesis, and in particular relates to an isobaric ammonia synthesis process. Background technique [0002] Ammonia is an important inorganic chemical product. Since the German chemist Haber discovered in 1902 that nitrogen and hydrogen can be directly synthesized into ammonia under high temperature and pressure and the presence of a catalyst, the ammonia synthesis industry has gradually developed into a pillar industry of the national economy. At present, the large-scale ammonia synthesis technology that is widely used in industry is the step-up ammonia synthesis process with a synthesis pressure above 15 MPa. The advantages of this process are that the synthesis pressure is high, the energy consumption of unreacted products is small, and the separation of ammonia is convenient. Due to the low pressure of the raw material synthesis gas, a high-power synthesis gas compressor and cycler are requir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C1/04B01J27/24B01J23/648B01J23/63
CPCY02P20/52
Inventor 江莉龙林建新倪军林炳裕林科
Owner FUZHOU UNIV ASSET MANAGEMENT CO LTD
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