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Energy-saving non-fusel oil dividing wall column-coupled multi-effect methanol rectification 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. problems, to achieve the effect of improving raw material utilization, saving steam energy consumption, and increasing process economy

Active Publication Date: 2019-04-19
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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  • Energy-saving non-fusel oil dividing wall column-coupled multi-effect methanol rectification device and method
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  • Energy-saving non-fusel oil dividing wall column-coupled multi-effect methanol rectification device and method

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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 energy-saving non-fusel oil dividing wall column-coupled multi-effect methanol rectification device and method. The device comprises a light component removal tower, a high-pressure tower, a medium-pressure tower a low-pressure non-fusel oil dividing wall column; the bottom of the light component removal tower is connected with a steam primary heat exchanger and the middle-lower part of the high-pressure tower through a pipeline; and the bottom of the high-pressure tower is connected with the middle-lower part of the medium-pressure tower. The bottom of the medium-pressure tower is connected with the middle-lower part of the low-pressure non-fusel oil dividing wall column through a pipeline. The energy-saving non-fusel oil dividing wall column-coupled multi-effectmethanol rectification is different from conventional double-effect methanol rectification, and the pressures and the tower top methanol extraction distribution of the high-pressure column, the medium-pressure tower and the low-pressure non-fusel oil dividing wall column are adjusted to make tower top steam of the high-pressure tower provide heat for a reboiler at the bottom of the medium-pressuretower and tower top steam of the medium-pressure tower provide heat for the low-pressure non-fusel oil dividing wall column in order to form the multi-effect rectification. The preheating of a raw material fully utilizes hot stream in the process to replace steam, so the steam consumption is saved, and the methanol consumption is 0.6-0.8 t / 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 Applications(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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