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Process for producing ammonia synthesis gas from methanol tail gas

A technology of ammonia synthesis gas and tail gas, which is applied in the fields of chemical industry, environmental protection and energy saving, and can solve the problems of wasting energy and large nitrogen loss

Inactive Publication Date: 2018-09-18
杨皓
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] PSA hydrogen production and liquid nitrogen washing hydrogen and nitrogen both have large hydrogen loss of more than 2%, and nitrogen loss is even greater, thus wasting a lot of energy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Embodiment 1: methanol tail gas total amount is 36000NM3 / H, 4.84MPa, after changing carbon monoxide, gas composition is hydrogen 74%, nitrogen 7%, carbon monoxide 0.2%, carbon dioxide 15.7%, methane 3.1%, add pure oxygen 90NM3 / H, called raw gas. Send the raw material gas into the preheater, increase the gas temperature to 130-180°C, send it to the carbon monoxide converter to convert carbon monoxide (over 30% oxygen), and the outlet carbon monoxide concentration is below 1ppm, recover the heat of the reaction gas to produce water vapor, and then send it to the refining The deoxygenation reactor reacts residual oxygen with excess hydrogen to obtain a gas with an oxygen concentration lower than 1ppm, recovers the heat of reaction to produce water vapor, cools the gas to room temperature, and sends the pressure swing adsorption device to remove carbon dioxide until the total concentration of carbon monoxide and carbon dioxide is lower than 10ppm, remove water dew point to ...

Embodiment 2

[0009] Embodiment 2: methanol tail gas total amount is 36000NM3 / H, 4.84MPa, after changing carbon monoxide, gas composition is hydrogen 71%, nitrogen 11%, carbon monoxide 0.2%, carbon dioxide 13.7%, methane 4.1%, add pure oxygen 90NM3 / H, called raw gas. Send the raw material gas into the preheater, increase the gas temperature to 130-180°C, send it to the carbon monoxide converter to convert carbon monoxide (over 30% oxygen), and the outlet carbon monoxide concentration is below 1ppm, recover the heat of the reaction gas to produce water vapor, and then send it to the refining The deoxygenation reactor reacts residual oxygen with excess hydrogen to obtain a gas with an oxygen concentration lower than 1ppm, recovers the heat of reaction to produce water vapor, cools the gas to room temperature, and sends the pressure swing adsorption device to remove carbon dioxide until the total concentration of carbon monoxide and carbon dioxide is lower than 10ppm, remove water dew point to...

Embodiment 3

[0010] Embodiment 3: methanol tail gas total amount is 36000NM3 / H, 11MPa, after changing carbon monoxide, gas composition is hydrogen 70%, nitrogen 6%, carbon monoxide 0.2%, carbon dioxide 20.7%, methane 4.1%, add pure oxygen 90NM3 / H, weigh as raw material gas. Send the raw material gas into the heat exchanger, reduce the gas temperature to 130-180°C, send it to the carbon monoxide converter to convert carbon monoxide (over 30% oxygen), and the outlet carbon monoxide concentration is below 1ppm, recover the heat of the reaction gas to produce water vapor, and then send it to the refining The deoxygenation reactor reacts residual oxygen with excess hydrogen to obtain a gas with an oxygen concentration lower than 1ppm, recovers the heat of reaction to produce water vapor, cools the gas to room temperature, and sends the pressure swing adsorption device to remove carbon dioxide until the total concentration of carbon monoxide and carbon dioxide is lower than 10ppm, remove water d...

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PUM

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Abstract

The invention relates to a process for producing ammonia synthesis gas from methanol tail gas. Methanol tail gas is converted into to carbon monoxide and carbon dioxide, and the concentration of the carbon monoxide in the conversion gas carbon monoxide gas is less than 0.2%; pure oxygen or equivalent air which exceeds the amount of oxygen needed by the conversion of the carbon monoxide by 0.1% isadded; a step of catalytically converting the carbon monoxide into carbon dioxide is set to convert the carbon monoxide with a concentration of 0.2% or below into carbon dioxide, and the concentrationof residual carbon monoxide is 1 ppm or below; the step of fine deoxidization of the conversion gas is carried out; and then fine removal on the carbon monoxide and the carbon dioxide is carried outthrough pressure swing adsorption, the concentrations of the carbon monoxide and the carbon dioxide are 10 ppm or below, and the ammonia synthesis gas is formed.

Description

technical field [0001] The invention relates to the fields of chemical industry, energy saving and environmental protection, and is a method for reducing pressure swing adsorption hydrogen production devices, thereby reducing ammonia synthesis investment. Background technique [0002] For the process of producing synthetic ammonia with methanol tail gas as raw material, two methods are generally used for the production of ammonia synthesis gas. [0003] One method is to send the methanol tail gas to the PSA hydrogen production device. The hydrogen production device uses alumina, silica gel, activated carbon, and molecular sieves to remove carbon dioxide, methane, carbon monoxide, and nitrogen, so that the total concentration of carbon monoxide and carbon dioxide will be below 10ppm, and the actual hydrogen yield will reach About 93%, if the recovery device is used, the hydrogen recovery rate can reach 98%, and the nitrogen is not recovered. [0004] One method is to send th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/50C01C1/04B01D53/047
CPCB01D53/047C01B3/50C01C1/04Y02C20/40Y02P20/151
Inventor 王娟芸杨皓王巍
Owner 杨皓
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