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Energy saving equipment of double effect rectification for methanol, and method

A technology of double-effect rectification and energy-saving equipment, applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve problems such as reflux pump not operating normally, increasing load of atmospheric tower, cavitation, etc. Achieve the effects of improving product quality and equipment use efficiency, reducing the possibility of cavitation, and improving product purity

Inactive Publication Date: 2006-04-19
TIANJIN UNIV
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Problems solved by technology

But there are still many deficiencies: first, the heat of condensation provided by the methanol vapor at the top of the pressurized column is greater than the heat required by the reboiler of the atmospheric column, and in order to achieve a certain product quality, the reflux ratio must be increased, that is, the atmospheric pressure is increased. The load on the tower has caused waste of heat energy and equipment; secondly, the methanol gas-liquid mixture coming out of the reboiler of the atmospheric tower is generally close to the bubble point temperature, and cavitation is prone to occur when passing through the reflux pump of the pressurized tower. It even causes the reflux pump to fail to operate normally; in addition, since the pressurized tower is close to the bubble point reflux, it is not conducive to the separation of methanol and ethanol at the top of the pressurized tower, so that the ethanol content in the product is relatively high, which affects the purity of the product

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  • Energy saving equipment of double effect rectification for methanol, and method

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Embodiment Construction

[0027] Below in conjunction with accompanying drawing 1, equipment and method of the present invention are further described, and concrete process is as shown in Figure 1:

[0028] 1. Crude methanol enters the middle and upper part of the pre-distillation tower (1) after the raw material preheater (11) exchanges heat with the steam condensate water of the reboiler of each tower. The vapor at the top of the pre-rectification column is partially condensed in the primary condenser (6-2), and the temperature of the condenser is controlled at 60-70°C. The non-condensable gas of the primary condenser enters the secondary condenser (6-1) and is cooled to 38-40°C, the non-condensable gas of the secondary condenser is sent as fuel, and the condensate passes through the return tank of the primary condenser (5-1) , returned to the top of the pre-rectification column by the reflux pump (9-1). The process extraction water is added into the secondary condenser or the primary condenser or i...

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Abstract

An energy-saving dual-effect methanol rectifying apparatus is composed of preheater for raw methanol, pre-rectifying tower, preheater for pre-rectified methanol, pressurizing tower, ordinary-pressure tower, re-boiling unit, condensing-reboiling unit and methanol recovering tower. The connections between said all units are also diseclosed.

Description

technical field [0001] The invention relates to the technical field of purification of chemical products, in particular to energy-saving equipment and methods for methanol double-effect rectification. Background technique [0002] Methanol is a very important basic chemical raw material, and also a promising clean energy and power fuel, which plays a pivotal role in the current global chemical product market. In recent years, due to the development of methanol and changes in the world's energy structure, new products using methanol as raw materials have been continuously developed, and the world's production and demand for methanol have been increasing year by year. [0003] Distillation is a very important chemical unit operation in methanol production, and it is directly related to issues such as product quality, environmental protection, energy consumption and production costs, among which the energy consumption of the rectification process...

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Application Information

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IPC IPC(8): C07C29/80C07C31/04
Inventor 孙津生李鑫钢徐世民宋慧平
Owner TIANJIN UNIV
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