Multi-effect rectifying process of methanol

A multi-effect distillation and process technology, applied in the chemical industry, sustainable manufacturing/processing, preparation of organic compounds, etc., can solve the problems of low methanol recovery, poor product quality, and high energy consumption

Inactive Publication Date: 2009-11-04
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
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  • Claims
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Problems solved by technology

Although the traditional methanol single-tower rectification process and double-tower rectification process have relatively low investment, due to their relatively poor product quality, low methanol recovery rate, and especially

Method used

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  • Multi-effect rectifying process of methanol

Examples

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Example Embodiment

[0019] In Example 1, the process of the present invention is as follows:

[0020] (1) First, use the crude methanol feed pump 25 to feed crude methanol containing impurities such as hydrogen, carbon monoxide, carbon dioxide, nitrogen, methane, dimethyl ether, methyl formate, acetone, ethanol, water, polyols, and alkanes into the crude methanol. The heat exchanger 26 respectively exchanges heat with the waste water of the recovery tower 21 and the methanol products from the reflux tanks 9 and 13 at the top of the first pressurization tower 8 and the second pressurization tower 12 to 65-80°C and then enters the pre-rectification tower 1 ;

[0021] (2) The vapor at the top of the pre-rectification tower 1 is cooled to about 65°C by the first-stage condenser 2 at the top of the pre-tower. Most of the methanol, water and a small amount of organic impurities are condensed and sent to the reflux tank 4 at the top of the pre-tower. Reflux, the first-cooled non-condensable gas enters the s...

Example Embodiment

[0026] Example 2. A set of 600,000-ton / year methanol rectification device adopts the methanol multi-effect rectification process in Example 1. The pre-rectification tower, washing tower, pressure tower I and pressure tower II are all used Structured packing, the lower part of the atmospheric tower and the recovery tower adopts a valve tray, and the rest adopts structured packing. When the refined methanol product meets the American Standard AA standard and the methanol content in the wastewater from the device is less than 50mg / kg, the methanol recovery rate of the device can reach more than 99.8%, and the total steam consumption is about 0.699t / t refined methanol, cooling water The total consumption is about 3.1t / t refined methanol. The diameter and height of the pre-rectification tower, pressurized tower I, pressurized tower II, atmospheric tower and recovery tower are respectively: φ2800×23m, φ2800×32m, φ2800×32m, φ3400×32m and φ2200×39m. In the same situation, if the four-towe...

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Abstract

The invention relates to a multi-effect rectifying process of methanol, which belongs to the technical field of separation and purification of chemical products. In the process, a crude methanol raw material of coal-to-methanol is rectified by a pre-rectifying tower, a pressurizing tower I, a pressurizing tower II, an atmospheric tower and a recovery tower in turn at appropriate temperature and pressure so as to obtain a high-purity refined methanol product according with quality requirements. In the flow, methanol steam on the top of the pressurizing tower I is used for providing heat for a reboiler at the bottom of the pressurizing tower II, the methanol steam on the top of the pressurizing tower II is used for providing heat for a reboiler at the bottom of the atmospheric tower, and the pressurizing tower I, the pressurizing tower II and the atmospheric tower form multi-effect rectification; and simultaneously, the methanol steam on the top of the recovery tower is used for providing heat for a reboiler at the bottom of the pre-rectifying tower, and the recovery tower and the pre-rectifying tower form double-effect rectification. The invention provides an energy-saving methanol multi-effect rectifying process method which has the advantages of greatly reduced energy consumption, more stable production process, more easily controlled product quality, higher methanol recovery rate and basically equivalent investment compared with a three-tower rectifying process.

Description

technical field [0001] The invention belongs to the separation and purification technology of chemical products, and in particular relates to a methanol multi-effect rectification process. Background technique [0002] In recent years, with the rapid development of coal chemical industry at home and abroad, the processing scale of methanol rectification unit has been greatly increased, and the quality requirements for refined methanol products are also more stringent. At present, the scale of most of the methanol plants under construction in China is between 100,000 and 600,000 tons per year, while there are million-ton methanol plants in foreign countries; the content of ethanol in refined methanol products is generally required to reach 25mg / kg (Even below 10mg / kg), the content of acetone is required to reach below 10mg / kg, in order to meet the needs of methanol downstream product production. Although the traditional methanol single-tower rectification process and double-...

Claims

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Application Information

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IPC IPC(8): C07C31/04C07C29/80
CPCY02P20/10
Inventor 张君涛梁生荣
Owner XI'AN PETROLEUM UNIVERSITY
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