Method for refining mixed alcohol by rectification-pervaporation coupling process

A technology of pervaporation and mixing alcohol, applied in the field of separation, can solve the problems of not complying with energy saving and environmental protection, the number of rectification towers used is large, and the energy consumption is high, achieving clean production, saving reprocessing costs, and high purity. Effect

Active Publication Date: 2015-12-16
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the use of corresponding organic solvents in the stages of azeotropic distillation and extractive distillation, and the number of rectification towers used i

Method used

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  • Method for refining mixed alcohol by rectification-pervaporation coupling process
  • Method for refining mixed alcohol by rectification-pervaporation coupling process
  • Method for refining mixed alcohol by rectification-pervaporation coupling process

Examples

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Embodiment 1

[0028] The rectification-pervaporation coupling process refines the method for mixed alcohol, and its specific steps are as follows:

[0029] 1) A mixed alcohol solution with a water content of 93.8wt% and a feed flow rate of 15L / h, the reflux ratio of the dehydration tower is 1, the feed is fed in the middle, and it is dehydrated by rectification and dehydration in the dehydration tower T1. Distillate composition is as shown in table 1;

[0030] 2) The top product enters the crude separation tower T2, the reflux ratio of the crude separation tower is 3, and the middle part feeds; the content of the tower top product is shown in Table 2, and the content of the tower bottom product is shown in Table 3; the obtained tower bottom product enters the separation Phase device V1, the temperature of the phase separator is 50°C, the oil phase product enters the pervaporation device M2 for further dehydration; the top product of the crude separation tower directly enters the pervaporati...

Embodiment 2

[0032] Fischer-Tropsch synthetic wastewater mixed alcohol refining process coupled with rectification-pervaporation process, the specific steps are as follows:

[0033] 1) A mixed alcohol solution with a water content of 93.8wt% and a feed flow rate of 15L / h. The reflux ratio of the dehydration tower is 1, and the feed is fed in the middle. It is dehydrated by rectification and dehydration in the dehydration tower T1. Composition is as shown in table 1;

[0034] 2) The top product enters the crude separation tower T2, the reflux ratio of the crude separation tower is 3, and the middle part feeds; the content of the tower top product is shown in Table 2, and the content of the tower bottom product is shown in Table 3; the obtained tower bottom product enters the separation The phase separator V1, the temperature of the phase separator is 50°C, the oil phase product enters the pervaporation device M2 for further dehydration; the top product directly enters the pervaporation devi...

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Abstract

The invention relates to a method for refining mixed alcohol by a rectification-pervaporation coupling process, which belongs to the technical field of separation. The method includes the following steps: aqueous mixed alcohol is sent into a dehydrating tower and rectified to be dehydrated, most of water is removed from the tower kettle, the mixture of the mixed alcohol and a small amount of water which is obtained from the tower top is sent into a rough separation tower and roughly separated, C1-C3 mixed alcohol and a small amount of water which are obtained from the top of the rough separation tower are condensed and then sent into a pervaporation device for further dehydration, the permeation side is water, and the retention side is the C1-C3 mixed alcohol; after C4-C8 mixed alcohol and a small amount of water which are obtained from the tower kettle of the rough separation tower are layered by a phase separator, the oil phase enters the pervaporation device and is separated, and the water phase returns into the dehydration tower. Compared with the prior art, the method does not need to add a third component in the process of dehydration, thus avoiding environment pollution caused by the addition of the third component and saving the retreatment cost for the third component, the process of azeotropic rectification and extractive rectification is omitted, so that energy consumption is reduced, and product quality is increased.

Description

technical field [0001] The invention specifically relates to a method for refining waste water mixed alcohols coupled with rectification-pervaporation processes, and belongs to the field of separation technology. Background technique [0002] At present, the coal liquefaction industry at home and abroad is in the ascendant, and Fischer-Tropsch synthesis is the core technology of indirect coal liquefaction. When producing high-quality liquid fuels, water-phase by-products containing oxygenated organic matter will also be produced. Whether the water-phase by-products can be recovered and treated is an important factor for the successful operation of coal-to-liquids projects. [0003] Oxygenated organic compounds in the aqueous phase by-products of Fischer-Tropsch synthesis are important industrial solvents and organic raw materials in pharmaceutical, fine chemical and other industries. If it is effectively recovered, it will not only help to improve the economic benefits of c...

Claims

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Application Information

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IPC IPC(8): C07C29/76C07C29/80
CPCC07C29/76C07C29/80
Inventor 邱挺蔡璇王红星叶长燊杨臣黄智贤杨金杯李玲陈锦溢王晓达张颖
Owner FUZHOU UNIV
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