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Fusel oil-free dividing wall column coupling methanol multi-effect rectification energy-saving device and method

A multi-effect rectification and fusel oil technology, which is applied in the field of fusel oil-free dividing wall column coupling methanol multi-effect rectification energy-saving device, can solve the problem of insufficient heat utilization in the process, high energy consumption of the overhead condenser of the atmospheric tower, etc. problem, to achieve the effect of improving the utilization rate of raw materials, saving steam energy consumption, and avoiding extraction

Active Publication Date: 2021-07-27
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although the methanol double-effect distillation process saves a lot of energy, the process heat is not fully utilized, and the overhead condenser of the atmospheric column consumes a lot of energy

Method used

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  • Fusel oil-free dividing wall column coupling methanol multi-effect rectification energy-saving device and method
  • Fusel oil-free dividing wall column coupling methanol multi-effect rectification energy-saving device and method
  • Fusel oil-free dividing wall column coupling methanol multi-effect rectification energy-saving device and method

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Effect test

Embodiment 1

[0027] Combine below figure 1 The apparatus and method of the present invention are further described.

[0028] The device includes a light removal tower, a high pressure tower, a medium pressure tower, and a low-pressure fusel oil-free dividing wall tower; the bottom of the light removal tower is connected to the middle and lower part of the high pressure tower through a pipeline and a steam primary heat exchanger; the bottom of the high pressure tower is connected through a pipe The road is connected with the middle and lower part of the medium pressure tower. The bottom of the medium-pressure column is connected with the middle and lower part of the low-pressure fusel oil-free dividing wall column through a pipeline.

[0029] The low-pressure fusel oil-free dividing wall column adopts a built-in partition, which is located at the top of the column and is closely connected with the top of the column; the stream enters the middle of the low-pressure fusel oil-free dividing w...

Embodiment 2

[0040] Combine below figure 2 The apparatus and method of the present invention are further described.

[0041] The device includes a light removal tower, a high pressure tower, a medium pressure tower, and a low-pressure fusel oil-free dividing wall tower; the bottom of the light removal tower is connected to the middle and lower part of the high pressure tower through a pipeline and a steam primary heat exchanger; the bottom of the high pressure tower is connected through a pipe The road is connected with the middle and lower part of the medium pressure tower. The bottom of the medium-pressure column is connected with the middle and lower part of the low-pressure fusel oil-free dividing wall column through a pipeline.

[0042] External wall-mounted low-pressure fusel oil-free bulkhead tower, including the main tower and externally suspended auxiliary tower; the flow enters the middle and lower part of the low-pressure main tower, the methanol product is extracted from the ...

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Abstract

The invention relates to an energy-saving device and method for coupling methanol multi-effect rectification with a fusel oil-free dividing wall tower. Including stripping tower, high-pressure tower, medium-pressure tower, low-pressure fusel oil-free bulkhead tower; the bottom of the stripping tower is connected to the middle and lower part of the high-pressure tower through pipelines and steam primary heat exchangers; the bottom of the high-pressure tower is connected through pipelines It is connected with the middle and lower part of the medium pressure tower. The bottom of the medium-pressure column is connected with the middle and lower part of the low-pressure fusel oil-free dividing wall column through a pipeline. Different from conventional methanol double-effect rectification, the present invention adjusts the pressure of high-pressure tower, medium-pressure tower, low-pressure fusel oil-free bulkhead tower and the distribution of methanol recovery at the top of the tower, so that the steam at the top of the high-pressure tower is reboiled at the bottom of the middle-pressure tower The steam at the top of the medium-pressure column provides heat for the reboiler of the low-pressure fusel oil-free dividing wall column, forming a multi-effect distillation. At the same time, the preheating of raw materials makes full use of the hot stream in the process to replace steam, saving steam energy consumption, and the unit consumption of methanol is 0.6-0.8t / t steam.

Description

technical field [0001] The invention belongs to the technical field of rectification, and relates to an energy-saving device and method for coupling methanol-free multi-effect rectification with a fusel oil-free dividing wall tower. Background technique [0002] Methanol is a basic chemical raw material and clean fuel, and occupies an important position in the world chemical market. As an indispensable separation operation unit in the chemical industry, rectification is widely used in the separation of methanol products. Methanol rectification is directly related to product quality, and its energy consumption accounts for 20-30% of the total energy consumption in the product production process. Therefore, research on energy-saving methods in the process of methanol rectification has attracted increasing attention. [0003] The existing methanol plants in my country are roughly divided into two-tower, three-tower, and four-tower distillation processes. The two-column proces...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D3/14B01D3/32
CPCB01D3/141B01D3/146B01D3/322
Inventor 孙津生刘思瑶崔承天陈金财
Owner TIANJIN UNIV
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