A process for isobaric ammonia synthesis and co-production of carbon-containing chemicals

An ammonia synthesis and chemical technology, applied in the field of synthetic ammonia, can solve the problems of low concentration of exported ammonia, excess methanol production capacity, low operating rate, etc., and achieve the effects of improving economic benefits, overcoming excess production capacity, and solving low operating rate

Active Publication Date: 2019-06-04
FUZHOU UNIV ASSET MANAGEMENT CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the purposes of the present invention is to overcome the defects of the existing low-pressure ammonia synthesis process that the outlet ammonia concentration is relatively low and fluctuates greatly. problem, and then provide a process for isobaric ammonia synthesis and co-production of carbon-containing chemicals that can increase ammonia yield

Method used

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  • A process for isobaric ammonia synthesis and co-production of carbon-containing chemicals
  • A process for isobaric ammonia synthesis and co-production of carbon-containing chemicals

Examples

Experimental program
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Effect test

Embodiment 1

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

[0052] (1) Dissolve 20 g of urea in 100 g of water to prepare a nitrogen-containing solution, and load the nitrogen-containing solution on a magnesium-aluminum hydrotalcite with a magnesium-aluminum molar ratio of 0.6 by an equal volume immersion method, and heat and dry it at 100°C. It is calcined in a nitrogen atmosphere at 190°C for 2 hours to obtain nitrogen-doped magnesium-aluminum hydrotalcite. The doping amount of nitrogen is 5.5% of the mass of the magnesium-aluminum hydrotalcite by mass;

[0053] (2) The nitrogen-doped magnesium-aluminum hydrotalcite was heated at a rate of 15°C / min to 630°C and heat-retained for 1h, and then heated at a rate of 3°C / min to 700°C and heat-retained and baked for 0.75h. It is the catalyst carrier, which contains 30v% spinel phase;

[0054] (3) Heat potassium fluorotantalate and sulfuric acid to above 400°C, and then dilute...

Embodiment 2

[0058] This embodiment provides a method for preparing a second ruthenium-based catalyst, including the following steps:

[0059] (1) Dissolve 15ml of ammonia in 90ml of water to prepare a nitrogen-containing solution, and load the nitrogen-containing solution on a magnesium-aluminum hydrotalcite with a magnesium-aluminum molar ratio of 1.7 by an isometric immersion method, heat and dry it at 80°C, It is calcined in an ammonia atmosphere at 200°C for 0.5h to obtain nitrogen-doped magnesium-aluminum hydrotalcite. The amount of nitrogen doped by mass is 8% of the mass of the magnesium-aluminum hydrotalcite;

[0060] (2) The nitrogen-doped magnesium-aluminum hydrotalcite was heated to 600°C at a rate of 10°C / min and heat-retained and roasted for 3 hours, and then heated to 710°C at a rate of 5°C / min and heat-retained and roasted for 0.5 hours. It is the catalyst carrier. It is determined that the carrier contains 45v% spinel phase, and the pore radius is distributed in the range of 5-...

Embodiment 3

[0065] This embodiment provides a method for preparing a second ruthenium-based catalyst, including the following steps:

[0066] (1) Dissolve 12ml of hydrazine hydrate in 100ml of water to prepare a nitrogen-containing solution, and load the nitrogen-containing solution on a magnesium-aluminum hydrotalcite with a magnesium-aluminum molar ratio of 2.5 by an equal volume immersion method, and heat and dry it at 90°C. Calcined in an ammonia atmosphere at 200°C for 1 hour to obtain nitrogen-doped magnesia-aluminum hydrotalcite. The amount of nitrogen doped by mass is 10% of the mass of the magnesia-aluminum hydrotalcite;

[0067] (2) The nitrogen-doped magnesium-aluminum hydrotalcite was heated at a rate of 5°C / min to 650°C and heat-retained for 2h, and then heated at a rate of 1°C / min to 720°C and heat-retained and baked for 0.5h. It is the catalyst carrier, which contains 37v% spinel phase;

[0068] (3) Heat potassium fluorotantalate and sulfuric acid to above 400°C, and then dilute ...

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Abstract

The invention provides a process for isobaric ammonia synthesis and co-production of carbon-containing chemicals. The co-production process sequentially purifies and converts carbon-containing raw material gas to promote the conversion of CO into synthetic oil, low-carbon alcohol and / or or low-carbon olefins, which greatly improves carbon utilization efficiency, and can flexibly adjust production according to market demand, improving the economic benefits of ammonia companies; the tail gas after the separation of the above carbon-containing chemicals is decarbonized and hydrogenated to obtain hydrogen, and its It is mixed with a specific amount of nitrogen as the raw material gas for ammonia synthesis, 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. The yield makes the ammonia net value in the outlet gas reach 20.3-22.5%, not only the yield is high but the fluctuation is small, and it has a good industrial application prospect.

Description

Technical field [0001] The invention belongs to the technical field of synthetic ammonia, and in particular relates to a process for synthesizing isobaric ammonia and co-producing carbon-containing chemicals. 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 in the presence of high temperature and pressure and 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 boosted ammonia synthesis process with a synthesis pressure above 15MPa. The advantages of this process are higher synthesis pressure, low energy consumption for unreacted circulation, and easy separation of ammonia, but correspondingly Due to the low pressure of the raw synthesis gas, a high-power synthesis gas compres...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B3/50C01B3/34C01C1/04B01J23/63C10G2/00
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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