Methanol multitower rectifying process and rectifying equipment

A rectification and methanol technology, applied in the chemical industry, hydroxyl compound preparation, sustainable manufacturing/processing, etc., can solve problems such as unreasonable energy utilization, poor energy saving, etc., to achieve increased operational flexibility, product quality assurance, system stable effect

Inactive Publication Date: 2010-04-14
刘海峰
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this case, energy utilization is unr...

Method used

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  • Methanol multitower rectifying process and rectifying equipment
  • Methanol multitower rectifying process and rectifying equipment

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Embodiment Construction

[0015] The present invention comprises the steps:

[0016] (1) The pump pumps the crude methanol into the preheater 15. After preheating, it enters the pre-rectification tower 2. The pre-column reboiler indirectly heats the crude methanol to 75-85°C. The light components contained in the crude methanol are two Methyl ether and methyl formate are vaporized and rise into the pre-tower condenser, the cooled liquid enters the gas-liquid separator, the cooling liquid enters the reflux tank, and the uncooled non-condensable gas enters the discharge tank and is directly discharged after being absorbed by soft water;

[0017] (2) The effluent at the bottom of the pre-rectification tower 2 at 75-85°C is pressurized by the methanol pump 12 and sent from the eighth tray to the pressurized rectification tower 3 for rectification, and the pressurized rectification tower 3 The operating pressure is ≤0.6MPa, the temperature of methanol vapor at the top of the tower is 110-128°C, and the rebo...

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Abstract

The invention relates to production process and equipment of chemical products, in particular to a methanol multitower rectifying process and rectifying equipment. The methanol multitower rectifying process comprises methanol multitower rectifying process steps and is characterized in that two pre-tower re-boilers are arranged at the bottom of a rectifying tower, wherein one pre-tower re-boiler takes the steam condensate of a pressurizing tower as a heat source, and a heat source of the other pre-tower re-boiler is waste liquid discharged from the bottom of a normal-pressure rectifying tower; the waste liquid enters from the lower part, flows out from the upper part and exchanges heat with crude methanol, and the heat exchanging time is prolonged; the heat exchanging efficiency cannot be influenced within short time when the flow rate of the waste liquid is fluctuated; sewage is discharged from the bottom, thereby avoiding frostbite in winter; and finally the waste liquid is subjected to biochemical treatment after being cooled. The rectifying equipment sufficiently utilizes the heat of the waste liquid, is more energy-saving and environment friendly and increases the operational flexibility; in addition, the rectifying equipment is more stable and the quality of products is ensured.

Description

technical field [0001] The invention relates to a chemical product production process and equipment, in particular to a methanol multi-tower rectification process and rectification equipment. Background technique [0002] In the methanol rectification process, most of the pre-rectification towers and one main tower or multiple towers are used for rectification. The temperature of the wastewater discharged from the bottom of the atmospheric distillation tower is about 107°C, containing a small amount of methanol and traces of higher alcohols, which are cooled by the raffinate condenser and sent to biochemical treatment. In this case, energy utilization is unreasonable, and energy saving is not done well. Contents of the invention [0003] The object of the present invention is to provide a methanol multi-tower rectification process and rectification equipment that fully utilizes heat energy, is energy-saving and environment-friendly. [0004] The methanol multi-tower rect...

Claims

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Application Information

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IPC IPC(8): C07C31/04C07C29/80
CPCY02P20/10
Inventor 刘海峰
Owner 刘海峰
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