Pressure-reducing flow-reversing dual-purpose distillation method and apparatus for refining crude methanol

A double-effect rectification and vacuum distillation technology, which is applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve the problem of high energy consumption, increased heat load of pressurized tower, and increased separation difficulty, etc. problem, to achieve the effect of reducing energy consumption and reducing energy consumption

Inactive Publication Date: 2008-02-27
CHINA HUANQIU CONTRACTING & ENG CO LTD
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Problems solved by technology

However, the operating pressure of the pressurized tower in this process is very high (usually above 0.7MPa), and when the pressure rises, the relative volatility of methanol-water, methanol-ethanol, etc. decreases, and the difficulty of separation increases, resulting in increased The heat load of the pressure column increases, which to a certain extent weakens the energy-saving advantage brought by the double-effect distillation, making the energy consumption of the existing "three-tower process" still relatively high

Method used

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  • Pressure-reducing flow-reversing dual-purpose distillation method and apparatus for refining crude methanol

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Embodiment 1

[0022] Production of AA grade methanol (main impurity mass content indicators: ethanol ≤ 10ppm, water ≤ 0.1%). The raw material is crude methanol after light removal, and its composition (mass content, the same below) is: 0.001% methyl formate, 88.859% methanol, 10.928% water, 0.121% ethanol, and 0.080% fusel alcohol. The raw material first enters the decompression tower (1), and the operating pressure is 50kPa (absolute pressure) (tower top) to 90kPa (absolute pressure) (tower still), and the operating temperature is 47.6°C (tower top) to 64.8°C (tower still). The reflux ratio is 1.45, and part of refined methanol (accounting for 67.22% of the total refined methanol amount) is extracted from the top of the tower, consisting of: methyl formate 0.0015%, methyl alcohol 99.998%, ethanol 0.0005%, and the discharge from the tower kettle enters the micro pressurized tower ( 7); the operating pressure of the micro pressurized tower is 215kPa (absolute pressure) (top) ~ 255kPa (absolu...

Embodiment 2

[0025] Produce national standard (GB 338-92) high-quality methanol (mass content index of main impurities: water≤0.01%, carbonyl compound 0.001%). Raw material is with embodiment 1. Raw material at first enters decompression tower (1), and operating pressure is the same as embodiment 1, and operating temperature is 47.6 ℃ (tower top)~64.9 ℃ (tower still), and reflux ratio is 0.74, and tower top extracts part refined methanol (accounting for total refined methanol 62.25% of the amount of methanol, consisting of: methyl formate 0.0016%, methyl alcohol 99.937%, water 0.010%, ethanol 0.050%, fusel alcohol 0.0016%), and the discharge from the tower kettle enters the micro-pressurization tower (7); the micro-pressurization tower The operating pressure is the same as in Example 1, the operating temperature is 84.9°C (tower top) to 127.5°C (tower still), the reflux ratio is 1.90, and the refined methanol (accounting for 37.75% of the total refined methanol amount, composed of methanol...

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Abstract

The invention discloses a dual-purpose distilling method and device to refine rough carbinol through decompression adverse current, which consists of a decompression tower (1) and a micro-pressurization tower (7), wherein the decompression tower (1) is front-effect and the micro-pressurization tower (7) is back-effect; the carbinol steaming at top of the micro-pressurization tower is aerated into condensation / reboiler (5) to chill, which can be heat source of tower kettle liquid of the decompression tower. The invention utilizes not only the energy-saving theory of dual-purpose distillation but the character of facilitating to increase relative volatility of relevant architecture of the rough carbinol by pressure reduction efficiently, which reduces energy consumption during refining process to a much more degree.

Description

Technical field [0001] The invention relates to a vacuum countercurrent double-effect rectification method and equipment for refining crude methanol. Background technique [0002] Methanol is an extremely important organic chemical raw material. In developed countries, its output is second only to ethylene, propylene and benzene. It is known as the third largest basic organic chemical raw material except olefins and aromatics. In recent years, with the successful development of methanol-to-olefins (MTO or MTP) technology, the scale of methanol plants has increased rapidly, and its energy-saving issues have become increasingly important. Methanol rectification is the key link to obtain refined methanol, but there is a problem of high energy consumption. [0003] The traditional methanol distillation process adopts a double-tower process consisting of a pre-tower (light removal tower) and a main tower (methanol rectification tower). Although the process is simple and the inve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/04C07C29/74C07C29/80
CPCY02P20/10
Inventor 曹新波秦霁光
Owner CHINA HUANQIU CONTRACTING & ENG CO LTD
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