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Single-tower steam-driven methanol six-tower four-effect rectification method without byproduct fusel oil

A technology of fusel oil and by-products, applied in the field of rectification, to achieve the effect of improving the overall utilization rate of raw materials, halving energy consumption, and increasing the amount of raw materials processed

Pending Publication Date: 2019-11-22
TIANJIN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

In addition, the energy efficiency of the above-mentioned rectification process still has the possibility of further improvement

Method used

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  • Single-tower steam-driven methanol six-tower four-effect rectification method without byproduct fusel oil
  • Single-tower steam-driven methanol six-tower four-effect rectification method without byproduct fusel oil
  • Single-tower steam-driven methanol six-tower four-effect rectification method without byproduct fusel oil

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Experimental program
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Effect test

Embodiment 1

[0032]The 75°C crude methanol raw material whose composition is shown in Table 1 enters the pre-separation column (1), and the overhead steam passes through the primary condenser (2) and the secondary condenser (3) in turn, and is condensed to 65°C and 40°C respectively , then enters the water washing tower (4). Wherein, the primary condenser (2) at the top of the pre-separation tower and the first reboiler (2) at the bottom of the vacuum tower are the same heat exchanger, forming a double-effect rectification. The condensate at the outlet of the condenser and the water washing tower enters the reflux tank (5), and the non-condensable gas is extracted from the top of the water washing tower (4). The reboiler (6) at the bottom of the pre-separation tower is driven by a stream of methanol vapor from the top of the high-pressure tower (12), and the bottom product of the pre-separation tower (1) enters the middle and lower part of the decompression tower (7). The refined methanol...

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Abstract

The invention relates to a single-tower steam-driven methanol six-tower four-effect rectification method without byproduct fusel oil. The adopted devices comprise a pre-separation tower, a depressurization tower, a normal pressure tower, a medium-pressure tower, a high-pressure tower and a recovery tower, the top of the pre-separation tower is sequentially connected with a two-stage condenser anda water washing tower through pipelines, and the bottom of the water washing tower is connected with a pre-separation tower return tank through a pipeline; the bottom of the pre-separation tower is connected with the middle lower part of the depressurization tower through a pipeline, the bottom of the depressurization tower is connected with the middle lower part of the normal pressure tower through a pipeline, and the bottom of the normal pressure tower is connected with the middle-lower part of the medium-pressure tower through a pipeline; the bottom of the medium-pressure tower is connected with the middle lower part of the high-pressure tower through a pipeline, and the high-pressure tower side-draw is connected with the middle lower part of the recovery tower through a pipeline.

Description

technical field [0001] The invention belongs to the technical field of rectification and relates to an energy-saving process for separating and purifying methanol in the production process of coal-based methanol. Background technique [0002] Methanol, a bulk chemical basic raw material, is widely used in the fields of fine chemicals, polymers, pesticides, medicine and energy, and occupies an important position in the international chemical market. [0003] Based on the actual national conditions of rich coal, little oil and poor gas in my country, the coal-based methanol production process has a natural competitive advantage in the field of crude methanol preparation. However, the crude methanol prepared by this method usually contains light component impurities such as dimethyl ether and heavy component impurities such as ethanol and water. It needs to be rectified to remove various light and heavy impurities before obtaining refined methanol products that meet quality req...

Claims

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Application Information

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IPC IPC(8): C07C29/80C07C31/04
CPCC07C29/80C07C31/04
Inventor 孙津生崔承天吕灏
Owner TIANJIN UNIV