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A Methanol Synthetic Reaction Gas Used in the Heating Process of Methanol Pre-rectification Tower

A pre-distillation tower and methanol synthesis technology, which is applied in the field of methanol preparation, can solve the problems of air-cooling power consumption, large cooling water consumption, and a large amount of low-level heat that cannot be used.

Active Publication Date: 2016-06-01
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the temperature of the methanol synthesis reaction gas after heat exchange with the synthesis feed into the tower gas is usually lower than 100°C, a large amount of low-level heat contained in the reaction gas cannot be used, and only water cooling or air cooling can be used to synthesize methanol, water, etc. When condensed, a large amount of heat is released by condensation, which requires a large amount of cooling water or consumes the electricity required for air cooling

Method used

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  • A Methanol Synthetic Reaction Gas Used in the Heating Process of Methanol Pre-rectification Tower
  • A Methanol Synthetic Reaction Gas Used in the Heating Process of Methanol Pre-rectification Tower

Examples

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Effect test

Embodiment 1

[0026] The methanol synthesis reaction gas of this embodiment is used in the heating process of the methanol pre-rectification tower as follows:

[0027] The temperature of the methanol synthesis reaction gas entering the reboiler of the methanol pre-rectification tower is 85°C (calculated as 200,000 tons / year methanol) and the pressure is 6.8MPa (A).

[0028] If the process is like figure 1 As shown, the methanol synthesis reaction gas temperature is 85°C, and the temperature is about 70°C after the methanol pre-rectification tower reboiler E1 heat exchange, and then the methanol pre-rectification tower feed heat exchanger E2 heat exchange, the methanol synthesis reaction gas temperature Down to 67 ℃ to the water cooler. The crude methanol enters the feed heat exchanger E2 of the methanol pre-rectification tower and is heated at a temperature of about 63°C, and then enters the methanol pre-rectification tower for rectification T. The pressure at the top of the methanol pre-rectif...

Embodiment 2

[0031] The methanol synthesis reaction gas of this embodiment is used in the heating process of the methanol methanol pre-rectification tower as follows:

[0032] The temperature of the methanol synthesis reaction gas entering the reboiler of the methanol pre-rectification tower is 81°C (calculated as 100,000 tons / year of methanol) and the pressure is 5.2MPa (A).

[0033] If the process is like figure 2 As shown, the methanol synthesis reaction gas temperature is 81°C, and the temperature is about 67°C after the heat exchange of the methanol pre-rectification tower reboiler E1, and then goes to the water cooler. The crude methanol enters the feed heat exchanger E2 of the methanol pre-rectification tower and is heated at a temperature of about 67°C, and then enters the methanol pre-rectification tower T for rectification. The pressure at the top of the methanol pre-rectification tower is controlled at 0.065MPa (A), the pressure at the bottom of the methanol pre-rectification tower...

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Abstract

The invention discloses a methanol pre-rectifying tower heating process by utilizing a methanol synthetic reaction gas. The methanol pre-rectifying tower heating process mainly comprises the following steps: using the methanol synthetic reaction gas as a heat source for heating a reboiler of a methanol pre-rectifying tower, and then performing feeding heat exchange on the methanol pre-rectifying tower; adopting a negative pressure as the operating pressure at the top of the methanol pre-rectifying tower, wherein the negative pressure is controlled by a water ring vacuum pump; cooling the non-condensable gas pumped by the water ring vacuum pump from the top of the tower, and then feeding the cooled non-condensable gas to a fuel gas pipe network; adding a certain volume of fresh water to the water ring vacuum pump, meanwhile adopting a certain volume of circulating liquid to control the liquid level in a circulating liquid storage tank of a circulating vacuum pump, and feeding the pumped circulating liquid to a reflux tank of the methanol pre-rectifying tower as a reflux liquid of the methanol pre-rectifying tower.

Description

Technical field [0001] The invention relates to the technical field of methanol preparation, in particular to a methanol synthesis reaction gas used in a methanol pre-rectification tower heating process. Background technique [0002] At present, after the heat exchange between the reaction gas at the exit of the methanol synthesis tower and the input gas of the synthesis feed, the synthesis reaction gas is cooled to normal temperature by water cooling or air cooling, so that the methanol, water, etc. produced by the synthesis are condensed, and then separated through gas-liquid separation. The liquid is used as crude methanol, most of the separated gas is circulated, and a small part of the gas is discharged as the release gas. [0003] Since the temperature of the methanol synthesis reaction gas after heat exchange with the synthesis feed gas into the tower is usually lower than 100°C, the large amount of low-level heat contained in the reaction gas cannot be used, and only water ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/04C07C29/80
CPCC07C29/80C07C31/04
Inventor 蹇守华黄维柱
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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