Process method and system for synthesizing methanel using by-product coal-gas during metallurgical process

A technology for by-product gas and methanol synthesis, applied in chemical instruments and methods, preparation of organic compounds, preparation of hydroxyl compounds, etc., can solve the problem of high cost, reduce product energy consumption and production cost, reduce emissions, and invest less Effect

Inactive Publication Date: 2003-03-26
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Methanol is usually synthesized from coal and natural gas, etc., and must go through processes such as coal and natural gas production, which is costly

Method used

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  • Process method and system for synthesizing methanel using by-product coal-gas during metallurgical process
  • Process method and system for synthesizing methanel using by-product coal-gas during metallurgical process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] figure 1 Shown is the process flow chart of synthesizing methanol by using the by-product gas in the metallurgical process. The by-product gas 1 of the metallurgical process whose composition is shown in Table 1 passes through the desulfurization device 2 in turn. The desulfurization process is carried out by combining wet and dry desulfurization, the water-gas shift device 3, and the decarbonization device 4. The decarbonization process uses diethanolamine wet Decarbonization by decarbonization method, pressure swing adsorption hydrogen production unit 5, pressure swing adsorption CO production unit 6, synthesis gas storage tank 7, compressor 8, heat exchanger 9 and deoxygenation unit 10 process, the components are synthesized as shown in Table 1 Gas (H 2 , CO, CO 2 ), under the action of the methanol synthesis catalyst in the methanol synthesis unit, the methanol synthesis reaction occurs; the reacted gas can be cooled, gas-liquid separated and methanol rectified to...

Embodiment 2

[0033] It is basically the same as Example 1, except that the process by-product gas and its composition-adjusted synthesis gas are different, as shown in Table 2. The main products of the slurry bed methanol synthesis reaction are methanol and a small amount of methane, the single-pass conversion rate of CO can reach 56.5%, and the methanol selectivity is greater than 97%.

Embodiment 3

[0035] It is basically the same as Example 1, the difference is that the by-product gas in the process and its composition-adjusted syngas composition are different (as shown in Table 3) and methanol synthesis adopts a fixed-bed process (reaction conditions are 5MPa, 250°C, 10000h -1 ). The main products of the fixed-bed methanol synthesis reaction are methanol and a small amount of methane, the single-pass conversion rate of CO can reach 35%, and the methanol selectivity is greater than 95%.

[0036] Table 1

[0037] Gas Composition (%)

[0038]CO CO 2 h 2 N 2 o 2 Metallurgical process by-product gas I 25.0 15.6 2.3 56.0 0.1 Syngas I for methanol synthesis 32.19 3.22 64.37 0.23 -

[0039] Table 2

[0040] Gas Composition (%)

[0041] CO CO 2 h 2 N 2 o 2 Metallurgical process by-product gas II 50.8 18.0 1.5 29.5 1.2 Syngas II for methanol synthesis 24.71 0.99...

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Abstract

The invention uses the by-product gas product in the course of metallurgical process as raw material for synthesizing methyl alcohol, and adopts the following steps: desulfurizing, decarbonizing, pressure swing adsorption to prepare H2, pressure swing adsorption to prepare CO and after deoxidation making regulation to obtain synthetic gas suitable for synthesizing methyl alcohol, making methyl alcohol synthesis reaction in the methyl alcohol synthesis equipment, and making the gas obtained after reaction undergo the processes of cooling, gas-liquid separation and rectification to obtain reagent-grade methyl alcohol.

Description

technical field [0001] The invention belongs to the technical field of methanol synthesis technology, and in particular relates to a process method and a system for synthesizing methanol by using the by-product gas in a metallurgical process. technical background [0002] The iron and steel industry is a pillar industry of the national economy, but it consumes a lot of energy and emits a lot of pollutants in production. Among them, a large amount of by-product gas (blast furnace gas, converter gas, etc.) is produced, and its energy is about 3200MJ / t iron. The energy quality is low and cannot be fully utilized directly. Therefore, making full use of the by-product gas in this process is an effective measure to reduce the total energy consumption and environmental pollution in the metallurgical process. When U.S. Patent (US5958107-A, 1999.9.28) utilizes the smelting reduction process to directly produce sponge iron, it has been proposed to use by-product gas to produce hydrog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/151C07C31/04
Inventor 王金福黎汉生韩明汉王德峥金涌
Owner TSINGHUA UNIV
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