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A low-pressure ammonia synthesis process for co-production of methanol

A technology of ammonia synthesis and ammonia synthesis tower, which is applied in the field of ammonia synthesis, can solve the problems of low utilization rate of nitrogen and hydrogen, low net value of exported ammonia, etc., achieve the effect of reducing energy consumption, increasing the net value of exported ammonia, and ensuring the smooth operation of the process

Active Publication Date: 2019-09-24
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] Therefore, the technical problem to be solved by the present invention is to overcome the defects in the prior art that the outlet ammonia net value is not high and the utilization rate of nitrogen and hydrogen is low, and then provide a high outlet ammonia net value, high nitrogen and hydrogen utilization rate, and low energy consumption. Low-pressure ammonia synthesis process with low energy consumption and stable operation

Method used

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  • A low-pressure ammonia synthesis process for co-production of methanol
  • A low-pressure ammonia synthesis process for co-production of methanol
  • A low-pressure ammonia synthesis process for co-production of methanol

Examples

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Embodiment 1

[0058] The present embodiment provides a low-pressure ammonia synthesis process for the co-production of methanol, comprising the following steps:

[0059] 1) Carry out cryogenic air separation to air to obtain nitrogen and oxygen, and the oxygen and natural gas are subjected to pure oxygen autothermal conversion to obtain CO and H 2 The mixed gas; moreover, containing CO and H 2 The mixed gas is passed into the waste heat boiler to recover heat, and high-pressure steam is obtained, which is used to pressurize the raw gas for synthesizing ammonia; then, the CO and H-containing 2 The mixed gas is divided into two streams, one is under the action of a copper-based catalyst to synthesize methanol at 210°C and 6 MPa, the other is separated by electrolysis of water to obtain hydrogen; finally, the mixed gas is separated by electrolysis of water, Obtain hydrogen; mix the hydrogen and nitrogen to form synthetic ammonia raw material gas, wherein S2 <10ppm, the molar ratio of hydrogen...

Embodiment 2

[0070] The present embodiment provides a low-pressure ammonia synthesis process for the co-production of methanol, comprising the following steps:

[0071] 1) Carry out cryogenic air separation to air to obtain nitrogen and oxygen, and the oxygen and natural gas are subjected to pure oxygen autothermal conversion to obtain CO and H 2 The mixed gas; moreover, containing CO and H 2 The mixed gas is passed into the waste heat boiler to recover heat, and high-pressure steam is obtained, which is used to pressurize the raw gas for synthesizing ammonia; then, the CO and H-containing 2 The mixed gas is divided into two streams, one is under the action of a copper-based catalyst to synthesize methanol at 250°C and 5 MPa, the other is separated by electrolysis of water to obtain hydrogen; finally, the mixed gas is separated by electrolysis of water, Obtain hydrogen; mix the hydrogen and nitrogen to form synthetic ammonia raw material gas, wherein S2 <10ppm, the molar ratio of hydrogen...

Embodiment 3

[0082] The present embodiment provides a low-pressure ammonia synthesis process for the co-production of methanol, comprising the following steps:

[0083] 1) Carry out cryogenic air separation to air to obtain nitrogen and oxygen, and the oxygen and natural gas are subjected to pure oxygen autothermal conversion to obtain CO and H 2 The mixed gas; moreover, containing CO and H 2 The mixed gas is passed into the waste heat boiler to recover heat, and high-pressure steam is obtained, which is used to pressurize the raw gas for synthesizing ammonia; then, the CO and H-containing2 The mixed gas is divided into two streams, one is under the action of copper-based catalyst to synthesize methanol at 230°C and 5.5MPa, and the other is subjected to electrolytic water separation to obtain hydrogen; finally, the electrolytic water separation is carried out on the mixed gas , to obtain hydrogen; the hydrogen and nitrogen are mixed to form synthetic ammonia raw material gas, wherein S2 <1...

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Abstract

The invention provides a low-pressure ammonia synthesis process for the co-production of methanol, comprising the following steps: 1) performing cryogenic air separation on air to obtain nitrogen and oxygen, and performing pure oxygen autothermal conversion of oxygen and natural gas to obtain CO and H 2 The mixed gas; 2) will contain CO and H 2 The mixed gas is divided into two streams, one stream is used to synthesize methanol under the action of a catalyst, and the other stream is electrolyzed to separate water to obtain hydrogen; 3) hydrogen and nitrogen are mixed to form raw material gas for ammonia synthesis, and the feedstock gas is mixed with iron-based catalyst Carry out primary ammonia synthesis in the first ammonia synthesis tower, synthesis pressure is 5-7MPa; 4) the mixed gas that comes out from described first ammonia synthesis tower enters the second ammonia synthesis tower of filling ruthenium-based catalyst to carry out secondary ammonia synthesis Synthesis, the synthesis pressure is 4‑6MPa. The invention satisfies the requirements of the ammonia synthesis process, ensures the smooth operation of the process, improves the net ammonia value at the outlet of the ammonia synthesis tower and the utilization rate of nitrogen and hydrogen, and co-produces methanol.

Description

technical field [0001] The invention belongs to the technical field of ammonia synthesis, and in particular relates to a low-pressure ammonia synthesis process for co-producing methanol. Background technique [0002] Ammonia is one of the important inorganic chemical products and occupies an important position in the national economy. Except that liquid ammonia can be directly used as fertilizer, nitrogen fertilizers used in agriculture, such as urea, ammonium nitrate, ammonium phosphate, ammonium chloride and various nitrogen-containing compound fertilizers, all use ammonia as raw material. Therefore, synthetic ammonia plays an important role in the national economy. The world's annual synthetic ammonia output has reached more than 100 million tons, of which about 80% of ammonia is used to produce chemical fertilizers, and 20% is used as raw materials for other chemical products. [0003] As we all know, synthetic ammonia is directly synthesized by nitrogen and hydrogen un...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C1/04C07C29/151C07C31/04B01J23/83B01J23/652B01J27/24
CPCB01J23/002B01J23/6527B01J23/83B01J27/24B01J2523/00C01C1/0411C01C1/0488C07C29/151C07C31/04B01J2523/13B01J2523/22B01J2523/31B01J2523/3712B01J2523/842B01J2523/68B01J2523/69B01J2523/25Y02P20/10Y02P20/129Y02P20/50Y02P20/52
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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