Flexible methanol rectification method and device capable of producing both MTO-grade and AA-grade methanol

A methanol rectification and flexible technology, applied in chemical instruments and methods, climate sustainability, sustainable manufacturing/processing, etc., can solve problems such as inability to generate benefits, complicated operation, and inability to produce AA grade methanol
CN104370697AInactive Publication Date: 2015-02-25SHANGHAI INT ENG CONSULTING
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SHANGHAI INT ENG CONSULTING
Publication Date
2015-02-25
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a flexible methanol rectification method and device capable of producing both MTO-grade and AA-grade methanol. The raw material crude methanol firstly enters a common stabilizer to remove light components; the crude methanol subjected to light component removal can enter a multi-effect evaporator to be heated and evaporated so as to generate alkali-metal-free methanol vapor, and the alkali-metal-free methanol vapor is condensed to generate the MTO-grade methanol; and the crude methanol subjected to light component removal can also enter a multi-effect rectifier composed of a pressurization tower, an atmospheric tower and a stabilizer to produce the AA-grade methanol by multi-effect rectification. The device is additionally provided with a crude methanol preheater, a first and second tower bottom methanol preheaters, a pressurization tower feed preheater and other units besides the multi-effect evaporator and multi-effect rectifier main body so as to perform repeated preheating, thereby saving the energy consumption. The stabilizer bottom discharging pump can be driven by a variable-frequency motor to satisfy the operation demands for two working conditions for producing the AA-grade methanol and MTO-grade methanol.
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Description

technical field

[0001] The invention relates to the technical field of methanol preparation, in particular to a flexible methanol rectification method and device that can produce both MTO grade and AA grade methanol by combining multiple effect evaporation and multiple effect rectification. Background technique

[0002] In view of the large-scale construction of methanol factories in my country in recent years, it has become a top priority to find downstream markets for methanol products. Under the current conditions, due to the limitation of my country's energy structure with more coal and less oil, the MTO and MTP technologies of producing methanol through coal and then producing olefins through methanol have become a way to break through the inherent constraints of my country's energy structure and open up methanol. Product downstream market.

[0003] According to the requirements of the downstream market for methanol products, the specifications of methanol can be divide...

Claims

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