Non-isostatic alcoholization alkylation process for purifying raw gas for ammonia synthesis

A kind of raw material gas, the technology of synthesizing ammonia

Inactive Publication Date: 2005-01-26
NANJING GOODCHINA CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: ①The purification degree of alcoholization is not high under the medium pressure of 10-16MPa (CO+CO 2 About 0.5~1.0%), so useless CH is generated after alkylation 4 more, and consume more H 2
②All by-production of methanol under medium pressure will cause a large reduction in raw gas volume, which will cause a large difference between the medium pressure compression ratio and high pressure compression ratio of the compressor, making operation difficult and increasing energy consumption, which is especially prominent in the reno

Method used

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  • Non-isostatic alcoholization alkylation process for purifying raw gas for ammonia synthesis
  • Non-isostatic alcoholization alkylation process for purifying raw gas for ammonia synthesis
  • Non-isostatic alcoholization alkylation process for purifying raw gas for ammonia synthesis

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Pass the synthesis gas into the φ1200mm medium-pressure alcoholization tower, the pressure is 15Mpa, the temperature is controlled at 210-270°C, so that it contains 3-10% CO+CO 2 The synthetic gas is synthesized into methanol under medium pressure, and the CO+CO is exported 2 Control it at 1-4%, pressurize, send the pre-purified synthesis gas into a φ1000mm high-pressure alcoholization tower, the pressure is 30.0Mpa, the temperature is controlled at 210-270°C, so that 1-4% CO+CO in the synthesis gas 2 Convert to methanol, export CO+CO 2 Control at ≤200ppm, send the deeply purified synthesis gas into a φ800mm high-pressure alkylation tower for alkylation, control the pressure at 30.0Mpa, control the temperature at 230-300°C, and export CO+CO 2 For <10ppm, the synthesis gas enters the ammonia synthesis. The alcohol ammoniation of the system is 0.1-0.4.

Embodiment 2

[0044] Pass the synthesis gas into the φ1600mm medium-pressure alcoholization tower, the pressure is 12.0Mpa, the temperature is controlled at 210-260°C, so that it contains 2-3% CO+CO 2 The synthetic gas is synthesized into methanol under medium pressure, and the CO+CO is exported 2 Control at 1.0-2.0%, pressurize, send the pre-purified synthesis gas into a φ1400mm high-pressure alcoholization tower, the pressure is 23.0Mpa, the temperature is controlled at 210-260°C, so that 1.0-2.0% CO+CO in the synthesis gas 2 Convert to methanol, export CO+CO 2 Control at ≤600ppm, send the deeply purified synthesis gas into a φ1400mm high-pressure alkylation tower for alkylation, control the pressure at 23.0Mpa, control the temperature at 250-350°C, and export CO+CO 2 ≤10ppm, the synthesis gas enters the ammonia synthesis. The alcohol ammoniation of this system is 0.06~0.2.

Embodiment 3

[0046] Pass the synthesis gas into the φ1200mm medium-pressure alcoholization tower, the pressure is 5Mpa, the temperature is controlled at 210-280°C, so that it contains 5-10% CO+CO 2 synthetic gas to methanol, export CO+CO 2Control it at 2-6%, pressurize, send the pre-purified synthesis gas into a φ1000mm high-pressure alcoholization tower, the pressure is 16.0Mpa, the temperature is controlled at 210-280°C, so that 2-6% CO+CO in the synthesis gas 2 Convert to methanol, export CO+CO 2 Control at ≤4000ppm, send the deeply purified synthesis gas into a φ800mm high-pressure alkylation tower for alkylation, control the pressure at 30.0Mpa, control the temperature at 250-350°C, and export CO+CO 2 For <10ppm, the synthesis gas enters the ammonia synthesis. The alcohol ammoniation of the system is 0.4-1.0.

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Abstract

The invention discloses a non-isostatic alcoholization alkylation process for purifying raw gas for ammonia synthesis, which consists of medium pressure alcoholization, pressure boosting, high pressure alcoholization, high pressure alkylation, by carrying out alcoholization and alkanisation under different pressures to the raw material gas, the purifying procedure can be optimized, and the production costs can be lowered.

Description

technical field [0001] The invention belongs to the field of synthetic ammonia, and in particular relates to a new process of non-isobaric alcohol alkylation purification of synthetic ammonia raw material gas. Background technique [0002] Since the ammonia synthesis catalyst requires the poisons CO and CO in the syngas 2 The content must be ≤10ppm, so CO and CO in the syngas need to be 2 There are many ways to purify poisons, one of which is to remove CO and CO in syngas through methanoly reaction 2 : [0003] <chemistry num="001"> <chem file="200410014826_cml001.xml" / > < / chemistry> [0004] <chemistry num="002"> <chem file="200410014826_cml002.xml" / > < / chemistry> [0005] This reaction is under the pressure of 3.0 ~ 18MPa, the residual CO and CO in the tail gas 2 About 3-0.5%, as the pressure increases, the lower the value, for example: residual CO and CO under the pressure of 20-32MPa 2 About 50-800PPm, the by-product methan...

Claims

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Application Information

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IPC IPC(8): C01B3/50
Inventor 吕仲明
Owner NANJING GOODCHINA CHEM TECH
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