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Heat-integrated process design for four carbon dioxide supplementing positions in methanol synthesis

A technology integrating methanol and process design, applied in the preparation of organic compounds, chemical industry, preparation of hydroxyl compounds, etc., can solve the problems of increasing energy consumption, increasing the water content of crude methanol, etc., to reduce the loss of effective energy, reduce emissions, and reduce energy consumption. consumption reduction effect

Pending Publication Date: 2020-11-17
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of this method is: excess CO 2 The presence of will cause the water content of crude methanol to increase, thereby increasing energy consumption

Method used

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  • Heat-integrated process design for four carbon dioxide supplementing positions in methanol synthesis
  • Heat-integrated process design for four carbon dioxide supplementing positions in methanol synthesis
  • Heat-integrated process design for four carbon dioxide supplementing positions in methanol synthesis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The specific steps of a low-energy-consumption and high-environmental-friendly heat-integrated methanol synthesis method for four carbon-supplementing sites are as follows:

[0048] (1) Methane steam reforming (SMR)

[0049] The raw material 2500kmol / h natural gas is pretreated and divided into two paths, about 50% (volume fraction) of natural gas, 7500kmol / h water vapor and 25kmol / h added CO 2 -1 stream is heated to 669°C by the heater HEATER2 and mixed into the first-stage methane steam reformer. The heat required by HEATER2 is provided by the subsequent coolers C1 and C8, and all raw materials undergo methane steam reformation in the SMR high-temperature reformer at 890°C And water gas shift reaction. Then add a stream of 25kmol / h CO after the SMR reformer 2 flow (CO 2 -2) to adjust the hydrogen-carbon ratio.

[0050] (2) Carbon Dioxide Methane Reforming (DMR)

[0051] The raw material gas is transformed into H through step (1) 2 , CO, CO 2 and CH 4 The mixed...

Embodiment 2

[0059] A low-energy and high-environmental-friendly heat-integrated methanol synthesis process design method with four carbon-supplementing positions, same as implementation case 1, wherein:

[0060] In step (1), the raw material 2240kmol / h natural gas is pretreated and divided into two paths, about 50% (volume fraction) of natural gas, 6720kmol / h water vapor and 20kmol / h CO 2 The -1 stream is heated to 564°C by the heater HEATER2 and enters the SMR at 800°C for conversion. Then add a stream of 20kmol / h CO after the SMR reformer 2 flow (CO 2 -2) to adjust the hydrogen-carbon ratio.

[0061] In step (2), the mixed gas enters the gas-liquid separator FLASH1 to separate excess water after being cooled by the coolers C1~C6, and then the gas phase is heated to 339°C by the heaters H1 and H2, and then mixed with another natural gas and 600 kmol / h CO 2 -3 streams are mixed, heated to 496°C, enter the DMR at 700°C for reaction, and finally generate methanol synthesis gas.

[0062...

Embodiment 3

[0066] A low-energy and high-environmental-friendly heat-integrated methanol synthesis process design method with four carbon-supplementing positions, same as implementation case 1, wherein:

[0067] In step (1), the raw material 1680kmol / h natural gas is pretreated and divided into two paths, about 50% (volume fraction) of natural gas, 5040kmol / h water vapor and 15kmol / h CO 2 The -1 stream is heated to 503°C by the heater HEATER2 and enters the SMR at 750°C for conversion. Then add a stream of 15kmol / h CO after the SMR reformer 2 flow (CO 2 -2) to adjust the hydrogen-carbon ratio.

[0068] In step (2), the mixed gas enters the gas-liquid separator FLASH1 to separate excess water after being cooled by the coolers C1~C6, and then the gas phase is heated to 336°C by the heaters H1 and H2, and then mixed with another natural gas and 450kmol / h CO 2 -3 streams are mixed, heated to 493°C, enter the DMR at 650°C for reaction, and finally generate methanol synthesis gas.

[0069]...

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Abstract

The invention discloses a heat-integrated process design for four carbon dioxide supplementing positions in methanol synthesis. First-stage steam methane reforming (SMR) and carbon dioxide methane reforming (DMR) are combined, carbon dioxide is supplemented in front of and behind an SMR reforming furnace, in front of the DMR reforming furnace and at circulating gas, and the whole process is subjected to heat integration. The process sequentially comprises the following steps: first-stage steam methane reforming, carbon dioxide methane reforming, compression, methanol synthesis and rectification to finally obtain refined methanol with the purity of 1 (mass fraction). The process design effectively solves the problems of high energy consumption, large CO2 emission and the like in the traditional methanol process.

Description

technical field [0001] The invention relates to a combination of one-stage methane steam reforming and carbon dioxide methane reforming, carbon replenishment before and after the methane steam reforming furnace, carbon dioxide methane reforming reforming furnace and circulating gas, recovery of methanol synthesis gas, methanol synthesis and rectification and process heat A heat-integrated methanol synthesis process design with four carbon-supplemented positions formed by integration. Background technique [0002] Methanol (CH 3 OH), also known as wood alcohol and xylin, is a colorless, transparent, volatile, alcohol-irritating liquid, and is the simplest saturated monohydric alcohol. It is soluble in water and miscible in alcohol and ether. As an important chemical raw material, methanol is widely used in the chemical and petrochemical industries, mainly for the production of formaldehyde, methyl tert-butyl ether (MTBE), acetic acid, methyl chloride and methylamine. In ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/151C07C29/80C07C31/04C01B3/34
CPCC07C29/1518C07C29/80C01B3/34C07C31/04Y02P20/10
Inventor 申威峰王红
Owner CHONGQING UNIV
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