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Low-carbon mixed alcohol separation system and separation method

A low-carbon mixed alcohol and membrane separation technology, applied in chemical instruments and methods, separation/purification of hydroxyl compounds, preparation of hydroxyl compounds, etc., can solve problems such as poor separation effect of low-carbon mixed alcohols, and achieve high-purity effects

Active Publication Date: 2016-08-24
CHNA ENERGY INVESTMENT CORP LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to provide a low-carbon mixed alcohol separation system and separation method to solve the problem of poor separation effect of low-carbon mixed alcohol in the prior art

Method used

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  • Low-carbon mixed alcohol separation system and separation method
  • Low-carbon mixed alcohol separation system and separation method
  • Low-carbon mixed alcohol separation system and separation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Low-carbon mixed alcohol separation system is used to separate low-carbon mixed alcohols. The separation system is as follows: image 3 shown.

[0068] The separation system includes: flash tank, non-condensable gas removal tower, first dehydration rectification tower, methanol rectification tower, ethanol rectification tower, extractive rectification tower, n-propanol rectification tower, first phase separator and corresponding cooler.

[0069] The operating conditions of each tower are as follows:

[0070] The operating pressure of the non-condensable gas removal tower is 0.203Mpa(G), and the operating temperature is 112.4°C.

[0071] The operating pressure of the first dehydration rectification tower is 0.081Mpa(G), and the operating temperature is 117.9°C;

[0072] The operating pressure of the methanol rectification tower is -0.05Mpa(G), and the operating temperature is 67.8°C;

[0073] The operating pressure of the ethanol rectification tower is 0.101Mpa(G), a...

Embodiment 2

[0078] Use the low-carbon mixed alcohol separation system to separate low-carbon mixed alcohols.

[0079] The separation system includes: methanol rectification tower, ethanol rectification tower, extractive rectification tower, n-propanol rectification tower, extractant recovery tower, n-propanol purification rectification tower, first dehydration rectification tower, second dehydration rectification tower Distillation tower and non-condensable gas removal tower; also includes first phase separator, second phase separator, membrane separation device and corresponding cooler. The extractant is ethylene glycol, and the oil-water separation membrane in the membrane separation device is a ceramic pervaporation membrane.

[0080] The operating conditions of each tower are as follows:

[0081] The operating pressure of the methanol rectification tower is -0.05Mpa(G), and the operating temperature is 67.8°C;

[0082] The operating pressure of the ethanol rectification tower is 0.1...

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Abstract

The invention discloses a separation system and a separation method of low-carbon mixed alcohol. The separation system comprises a low-carbon mixed alcohol feeding device, a methanol rectifying tower, an ethanol rectifying tower, an extraction rectifying tower and a normal propyl alcohol rectifying tower, wherein the low-carbon mixed alcohol feeding device is provided with a low-carbon mixed alcohol outlet; the methanol rectifying tower is provided with a methanol tower feeding hole, a methanol tower top discharging hole and a methanol tower bottom discharging hole, and the methanol tower feeding hole is connected with the low-carbon mixed alcohol outlet; the ethanol rectifying tower is provided with an ethanol tower feeding hole, an ethanol tower top discharging hole and an ethanol tower bottom discharging hole, and the ethanol tower feeding hole is connected with the methanol tower bottom discharging hole; the extraction rectifying tower is provided with an extraction tower feeding hole, an extraction agent feeding hole, an extraction tower top discharging hole and an extraction tower bottom discharging hole, and the extraction tower feeding hole is connected with the ethanol tower top discharging hole; the normal propyl alcohol rectifying tower is provided with a normal propyl alcohol tower feeding hole, a normal propyl alcohol tower top discharging hole and a normal propyl alcohol tower bottom discharging hole, and the normal propyl alcohol tower feeding hole is connected with the ethanol tower bottom discharging hole. In the separation system, a purification mode that a rectifying system is combined with an extraction system is utilized, so that obtained monoalcohol has relatively high purity.

Description

technical field [0001] The invention relates to the field of separation of mixed alcohols, in particular to a separation system and method for low-carbon mixed alcohols. Background technique [0002] Low-carbon mixed alcohols refer to mixed alcohols formed from C1-C6 alcohols, which are mainly formed by dehydrating crude mixed alcohols synthesized from coal-based synthesis gas. Low-carbon mixed alcohol has higher octane number and good blending performance with gasoline, and can replace methyl tert-butyl ether (MTBE) as a gasoline additive. At the same time, low-carbon mixed alcohol itself is also a good clean fuel, which can replace gasoline as fuel. In fact, if the mixed low-carbon alcohols are separated, high-grade chemical alcohols such as A, B, C, D, and amyl alcohol can be obtained. These monoalcohol products are important intermediates for the preparation of bulk chemicals such as pharmaceutical products and polymer products. higher economic value. Therefore, it is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/04C07C31/08C07C31/10C07C29/80C07C29/76
CPCC07C29/76C07C29/80C07C29/84C07C31/04C07C31/08C07C31/10C07C31/12
Inventor 吴秀章卢卫民李水弟王立志谢君张艳红郭胜好苏爱东董栗英彭晓春戈军赵代胜蔡丽娟李艺张金利房克功张敏卿刘玉龙杨锦郑琳
Owner CHNA ENERGY INVESTMENT CORP LTD
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