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System and process for preparing methanol through hydrogenation of carbon dioxide

A technology for the preparation of carbon dioxide and hydrogen, applied in the preparation of hydroxyl compounds, the preparation of organic compounds, the separation/purification of hydroxyl compounds, etc., can solve the problems of increased operating costs, complicated operation and maintenance, etc., and achieve the goal of saving compression work and reducing energy consumption Effect

Pending Publication Date: 2021-06-29
华电水务工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the use of circulating compressors, it will lead to increased operating costs and complicated operation and maintenance

Method used

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  • System and process for preparing methanol through hydrogenation of carbon dioxide
  • System and process for preparing methanol through hydrogenation of carbon dioxide
  • System and process for preparing methanol through hydrogenation of carbon dioxide

Examples

Experimental program
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Effect test

Embodiment 1

[0025] System embodiment 1 of the present invention: a system for producing methanol by hydrogenation of carbon dioxide, comprising at least three methanol production units 1 connected in series, the methanol production unit 1 includes a tower preheater 7, a methanol synthesis tower 4, a methanol water cooling device 5 and methanol separator 6; the raw material inlet of the tower preheater 7 is connected with the purified raw material mixing gas pipe, and the raw material gas outlet of the tower preheater 7 is connected with the inlet of the methanol synthesis tower 4; the methanol synthesis tower The gas outlet of 4 is connected with the high-temperature air inlet of the tower preheater 7, the high-temperature gas outlet of the tower preheater 7 is connected with the feed port of the methanol water cooler 5, and the outlet of the methanol water cooler 5 is separated from methanol The feed port of the device 6 is connected; the gas outlet of the methanol separator 6 of the uppe...

Embodiment 2

[0028] Process Example 2: A process for producing methanol by hydrogenation of carbon dioxide, using the system for producing methanol by hydrogenation of carbon dioxide described in Example 1, including the following method: adding the mixed gas of raw materials to the first-stage methanol production unit 1 The raw material inlet of the tower preheater 7, the raw material mixture gas in the tower preheater 7 is heated to a specified temperature, and then introduced into the methanol synthesis tower 4, the synthesis gas reacts in the catalytic bed of the methanol synthesis tower, and the heat of reaction Removed by the boiler water, by-product steam, the outlet gas after the reaction of the methanol synthesis tower 4 enters the high-temperature air inlet of the tower preheater 7 as a heat source; the reacted outlet gas enters the tower preheater 7 After being discharged, it is lowered to the specified temperature through the methanol water cooler 5, and then introduced into the...

Embodiment 3

[0030]Process Example 3: A process for producing methanol by hydrogenation of carbon dioxide, using the system for producing methanol by hydrogenation of carbon dioxide described in Example 1, including the following method: adding the mixed gas of raw materials to the first-stage methanol production unit 1 The raw material inlet of the tower preheater 7, the raw material mixture gas in the tower preheater 7 is heated to a specified temperature, and then introduced into the methanol synthesis tower 4, the synthesis gas reacts in the catalytic bed of the methanol synthesis tower, and the heat of reaction Removed by the boiler water, by-product steam, the outlet gas after the reaction of the methanol synthesis tower 4 enters the high-temperature air inlet of the tower preheater 7 as a heat source; the reacted outlet gas enters the tower preheater 7 After being discharged, it is lowered to the specified temperature through the methanol water cooler 5, and then introduced into the ...

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Abstract

The invention discloses a system for preparing methanol through hydrogenation of carbon dioxide, wherein the system comprises at least three stages of methanol preparation units connected in series, and each methanol preparation unit comprises an in-tower preheater, a methanol synthesis tower, a methanol water cooler and a methanol separator; a raw material gas inlet of the in-tower preheater is communicated with a purified raw material mixed gas pipe, and a raw material gas outlet of the in-tower preheater is communicated with a gas inlet of the methanol synthesis tower; a gas outlet of the methanol synthesis tower is communicated with a high-temperature gas inlet of the in-tower preheater, a high-temperature gas outlet of the in-tower preheater is communicated with a feed port of the methanol water cooler, and a discharge port of the methanol water cooler is communicated with a feed port of the methanol separator; a gas outlet of the methanol separator of the previous-stage methanol preparation unit is communicated with a raw material gas inlet of the in-tower preheater of the next-stage methanol preparation unit; and the gas outlet of the methanol separator of the last-stage methanol preparation unit is communicated with the gas inlet of the methanol water washing tower. A recycle gas compressor is omitted, non-circulation of methanol preparation through hydrogenation of carbon dioxide is realized, and the compression work is saved.

Description

technical field [0001] The invention relates to a system and process for preparing methanol by hydrogenation of carbon dioxide, belonging to the technical field of methanol preparation systems and processes. Background technique [0002] Methanol is an important chemical basic raw material and an important fuel. Currently, it is mainly composed of natural gas or coal through synthesis gas (H 2 +CO) preparation. Recently, with the goal of "carbon peaking and carbon neutrality" proposed, as one of the large-scale utilization methods of carbon dioxide, the technical route of carbon dioxide hydrogenation to methanol has been paid more and more attention, and it also plays an important supporting role in the development of the CCUS industrial chain On the one hand, it can reduce greenhouse gas emissions and realize the recycling of carbon and hydrogen sources; on the other hand, it can be connected with new energy electrolytic hydrogen production, chlor-alkali and other industri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/152C07C29/76C07C29/80C07C31/04
CPCC07C29/152C07C29/76C07C29/80C07C31/04
Inventor 任楠楠刘进李宏秀
Owner 华电水务工程有限公司
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