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Device and method for pervaporation by energy cyclic utilization

A pervaporation and energy cycle technology, applied in the field of separation, can solve the problems of large energy consumption, increase the production cost of pervaporation technology, limit the application and promotion of pervaporation technology, and achieve energy saving, strong adaptability to operating temperature range, and product performance good effect

Active Publication Date: 2019-10-08
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the pervaporation process, since the vaporization process requires a lot of energy, and the gas condensation on the permeate side requires a lot of energy, it is necessary to heat the front side of the pervaporation membrane in the whole process to maintain the operating performance of the membrane, and the rear side of the membrane needs to be heated. In the process of repeated heating and condensation, a large amount of energy is consumed, which increases the production cost of pervaporation technology and greatly limits the application and promotion of pervaporation technology.

Method used

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  • Device and method for pervaporation by energy cyclic utilization

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Embodiment 1

[0031] A pervaporation method for energy recycling, comprising the following steps: the raw material methyl acetate / methanol organic solvent mixture 1, the flow rate of which is 1562.5kg / h, and the temperature of the mixture is 42.1°C. Among them, the mass fraction of methyl acetate is 88.8wt%, which is transported to the membrane module (A) produced by Nanjing Jiusi High-Tech Co., Ltd. for separation. The membrane used therein is a self-made polymer-ceramic composite inner membrane (from a patent: a preparation method of a polymer-ceramic composite inner membrane, and its application publication number is Example 3 in the patent of CN109304098A). The relative pressure on the retentate side is 2.2 Atm, the vacuum pressure on the permeate side is controlled at 10000Pa, the separation temperature is 38.2°C, the mass flow rate of the permeate side is 34% of the mass flow rate of the mixture 1, and the mixture 3 on the permeate side passes through the vacuum pump (B) first, and the...

Embodiment 2

[0033]A new pervaporation process for energy recycling, including the following steps: transport the raw material ethanol / water organic solvent mixture 1, with a flow rate of 1813.3kg / h, a temperature of 63.3°C, and a mass fraction of ethanol of 31.8wt%, to Jiangsu Separation was carried out in the flat membrane module (A) produced by Peier Membrane Co., Ltd. The membrane used in the membrane module (A) is a self-made polyether block amide polymer (from the patent: a preparation method of triptylenyl polyimide separation membrane whose application publication number is CN108579471A in the embodiment 3 Membrane) wherein the membrane surface velocity is 0.01m / s, the raw material side relative pressure is 8atm, the permeate side vacuum pressure is controlled at 12000Pa, the separation temperature is 38.2°C, and the amount on the permeate side is 11% of the mass flow rate of the mixture 1. The mixture 3 on the permeate side first passes through the hybrid first heat exchanger (C) ...

Embodiment 3

[0035] A new pervaporation process for energy recycling, comprising the following steps: the raw material n-octane / white oil organic solvent mixture 1, the flow rate is 1747.5kg / h, and the temperature of the mixture is 62.7°C. Among them, the mass fraction of n-octane is 88.8wt%, which is transported to the roll-type solvent recovery membrane module (A) produced by Nanjing Jiusi High-Tech Co., Ltd. for separation. The relative pressure on the raw material side is 2.2 atm, the vacuum pressure on the permeate side is controlled at 5000 Pa, the separation temperature is 58.2°C, and the amount on the permeate side is 25% of the mass flow rate of the mixture 1. The mixture 3 on the permeate side passes through the vacuum pump (B) first, and then passes through the first plate heat exchanger (C) to condense. The mass flow rate of the mixture 3 on the permeate side is 436.88kg / h, wherein the concentration of n-octane is 99.1wt%, the pressure of the mixture 4 after passing through the...

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Abstract

The invention provides a device and a method for pervaporation by energy cyclic utilization, belonging to the technical field of separation. The device comprises a pervaporation membrane assembly, a vacuum pump and heat exchangers, wherein a heating medium of a first heat exchanger C is a mixture located at the side of permeation in the process of pervaporation; a cooling medium of the first heatexchanger C is a solution located at the side of interception in the process of pervaporation; and a cooling medium of a second heat exchanger D is a commonly-used low-temperature cooling medium. According to the invention, almost no additional energy is needed in the whole process, and strong applicability of an operation temperature range is achieved in the process of pervaporation, so low energy consumption is realized in the whole process, and a pervaporation process is expected to save energy by about 30% compared with a traditional pervaporation process; meanwhile, a third substance is not introduced, so the pervaporation process is green and pollution-free, and a separated product has good performance.

Description

technical field [0001] The invention relates to the field of separation technology, in particular to an energy recycling pervaporation device and method. Background technique [0002] The pervaporation process is a common method for the purification of organic solvents that is common in industry. In the pervaporation process, since the vaporization process requires a lot of energy, and the gas condensation on the permeate side requires a lot of energy, it is necessary to heat the front side of the pervaporation membrane in the whole process to maintain the operating performance of the membrane, and the rear side of the membrane needs to be heated. In this process of repeated heating and condensation, a large amount of energy is consumed, which increases the production cost of pervaporation technology and greatly limits the application and promotion of pervaporation technology. Contents of the invention [0003] The present invention provides an energy recycling pervaporat...

Claims

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Application Information

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IPC IPC(8): B01D61/36
CPCB01D61/362B01D61/366B01D61/368
Inventor 周浩力宗传欣金万勤
Owner NANJING UNIV OF TECH