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Methanol pre-rectifying tower heating process by utilizing methanol synthetic reaction gas

A pre-rectification tower and methanol synthesis technology, which is applied in the field of methanol preparation, can solve the problems of unavailability of a large amount of low-level heat, consumption of air-cooled electric energy, and consumption of large cooling water.

Active Publication Date: 2015-06-17
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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  • Methanol pre-rectifying tower heating process by utilizing methanol synthetic reaction gas
  • Methanol pre-rectifying tower heating process by utilizing methanol synthetic reaction gas

Examples

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Effect test

Embodiment 1

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

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

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

Embodiment 2

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

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

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

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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 heat exchange between the reaction gas at the outlet of the methanol synthesis tower and the synthesis feed gas entering the tower, water cooling or air cooling is used to cool the synthesis reaction gas to normal temperature, so that the methanol and water generated by the synthesis are condensed, and then separated by gas-liquid separation. The liquid is used as crude methanol, most of the separated gas is recycled, and a small part of the gas is discharged as release gas. [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...

Claims

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Application Information

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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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