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Dioxane Solvent Recovery
Release time:
2022-07-29 20:08
Source:
Technology Introduction
Many solvents can form azeotropic and near-boiling mixtures with water, and it is difficult to further concentrate to a higher purity by using common rectification techniques. Traditional solvent dehydration processes such as rectification, azeotropic rectification, pressure swing distillation, pressure swing Adsorption, desiccant, etc. have problems such as high energy consumption, low yield, unfriendly environment, complicated operation, and low product quality.
Molecular sieve membrane dehydration technology is driven by the vapor partial pressure difference of the components, and utilizes the difference in the dissolution ( adsorption ) -diffusion rate of the components in the membrane pores and the difference in molecular size to achieve the separation between components, which is not affected by the vapor-liquid equilibrium of the separation system. It has high single-stage separation efficiency and is especially suitable for the separation of azeotropic and near-boiling mixtures. The packing density of the second-generation four-channel hollow fiber membrane is more than 3 times that of the tubular membrane , and the flux is more than 2 times. At the same time, give full play to the advantages of the membrane process in and out of the gas phase, breaking the azeotropic point, and the tower has the advantages of removing impurities and separating organic components to achieve process optimization!
|
name |
Ethanol dehydration (water 10→0.5%) |
Isopropyl alcohol dehydration (water 15→0.5%) |
||
|
azeotropic distillation |
Molecular sieve membrane |
Flake alkali absorbs water |
Molecular sieve membrane |
|
|
Steam (t/t) |
~2 |
~0.5 |
0.8 |
0.5 |
|
yield |
~92% |
>99% |
~92% |
>99% |
|
third component |
Have |
none |
Have |
none |
|
waste water |
Have |
none |
Have |
none |
|
Operating cost (yuan/t) |
~550 |
~200 |
~800 |
~230 |
|
name |
Dehydration of tetrahydrofuran (water 5→0.05%) |
Acetonitrile dehydration (water 25→1%) |
||
|
Flake alkali absorbs water |
Molecular sieve membrane |
Extractive distillation |
Molecular sieve membrane |
|
|
Steam (t/t) |
~0.75 |
~0.3 |
~2 |
~0.5 |
|
yield |
~85% |
>99% |
>95% |
>99% |
|
third component |
Have |
none |
Have |
none |
|
waste water |
Have |
none |
Have |
none |
|
Operating cost (yuan/t) |
~750 |
~220 |
~500 |
~200 |
Flow chart
Dioxane solvent recovery is shown in the following figure:
Process advantage
1 ) No third component is added, no waste liquid is discharged, and the yield is high. 2 ) Using the membrane distillation coupling technology, the process is simple and the operation energy consumption is low. 3 ) Easy to operate and high degree of automation.
Project display
Customer: On-site installation of a new material Co., Ltd. in Xuzhou is shown in the figure below:
|
project |
Technical indicators |
|
finished product |
Dioxane≥99.9% |
|
Exterior |
Colorless and transparent |
The research institution approved by Nanjing is also an independent legal entity of the first professional research institute of Jiangsu Industrial Technology Research Institute Membrane Science and Technology Research Institute, which is positioned as the organizer of membrane material industry cultivation.
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