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Polydimethylsiloxane permeable vaporized gasoline desulphurization membrane and preparation method thereof

A technology of polydimethylsiloxane and pervaporation, which is applied in chemical instruments and methods, semi-permeable membrane separation, refining by dialysis, etc. It can solve the problem of unsatisfactory modification effect, expensive filler, and flux Reduce the problem of large drop, and achieve the effects of not being easy to secondary pollution, low cost, and simple membrane production process

Inactive Publication Date: 2014-07-30
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, some of these fillers need to be pretreated first, such as ion exchange (Journal of Membrane Science 295 (2007) 114-120, Journal of Membrane Science 322 (2008) 293-301), the flux is greatly improved and the selectivity It has declined; some modification effects are not very ideal, the flux drops after adding fillers, and the fillers are more expensive (Separation and Purification Technology 57 (2007) 170-175), and the cost of the above methods is relatively high

Method used

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  • Polydimethylsiloxane permeable vaporized gasoline desulphurization membrane and preparation method thereof
  • Polydimethylsiloxane permeable vaporized gasoline desulphurization membrane and preparation method thereof
  • Polydimethylsiloxane permeable vaporized gasoline desulphurization membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] α-Al 2 o 3 Vacuum-dry at 120°C for 14 hours before use. Cut out a 12×12cm PTFE membrane, wash it with ethanol, flatten it, and spread it on an organic plate. Weigh 6.000g of PDMS, measure 11.6ml of n-heptane and 6.46ml of TEOS into the beaker, and stir magnetically for 1h. Weigh 0.375g of dried α-Al 2 o 3 Add the solution and sonicate for 1h. Then measure 0.2ml of dibutyltin laurate and add it to continue magnetic stirring for 10min, then measure 6ml of the solution and coat it on the PTFE membrane, and put it in an oven at 35°C to dry for 14h to form a film. A metal oxide-filled PDMS composite film was obtained.

[0026] The evaluation of the pervaporation performance of the composite membrane was carried out by a pervaporation test device, using n-heptane-thiophene mixture to simulate gasoline, and the evaluation results showed that when the sulfur content of the feed liquid was 380 μg / g and the temperature was 30°C, the permeate obtained on the permeate side Th...

Embodiment 2

[0034] Weigh 6.000g of PDMS, measure 11.6ml of n-heptane and 6.46ml of TEOS into the beaker, and stir magnetically for 1h. Weigh 0.750g of dried α-Al 2 o 3 Add the solution, sonicate for 1 hour, add 0.2ml of dibutyltin laurate and continue magnetic stirring for 10 minutes. During this period, cut out a 12×12cm PAN film, wash it with ethanol, flatten it, and spread it on an organic plate. Measure 6ml of the solution and coat it on the PTFE membrane, and put it in an oven at 35°C to dry for 14h to form a membrane.

[0035] The evaluation of the pervaporation performance of the composite membrane is the same as in Example 1. The pervaporation results of the temperature in the range of 30-70°C are shown in Table 1, and the pervaporation results of the feed liquid sulfur content in the range of 380-1900 μg / g are shown in Table 2.

Embodiment 3

[0037] Weigh 6.000g of PDMS, measure 11.6ml of n-heptane and 6.46ml of TEOS into the beaker, and stir magnetically for 1h. Weigh 1.500g of dried α-Al 2 o 3 Add the solution, sonicate for 1 hour, add 0.2ml of dibutyltin laurate and continue magnetic stirring for 10 minutes. During this period, cut out a 12×12cm PEI film, wash it with ethanol, flatten it, and spread it on an organic plate. Measure 6ml of the solution and coat it on the PTFE membrane, and put it in an oven at 35°C to dry for 14h to form a membrane.

[0038] The evaluation of the pervaporation performance of the composite membrane is the same as in Example 1. The pervaporation results of the temperature in the range of 30-70°C are shown in Table 1, and the pervaporation results of the feed liquid sulfur content in the range of 380-1900 μg / g are shown in Table 2.

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Abstract

The invention relates to a polydimethylsiloxane permeable vaporized gasoline desulphurization membrane and a preparation method thereof. The invention relates to a polydimethylsiloxane composite membrane used in membrane-separation desulphurization, and a preparation method thereof. According to the invention, with the membrane, a separation performance can be improved. Relatively high flux and selectivity of the membrane are maintained. Also, the cost of the polydimethylsiloxane permeable vaporized gasoline desulphurization membrane is low. The polydimethylsiloxane permeable vaporized gasoline desulphurization membrane is a composite membrane composed of an active layer and a basement membrane. The preparation method comprises steps that: a metal oxide is dried, and is preserved for later use; the basement membrane is sufficiently washed by using an organic solvent, and is preserved for later use; PDMS is added to a solvent A and a cross-linking agent, such that a solution A is prepared; the processed metal oxide is added to the solution A, and the solution is subject to an ultrasonic treatment, such that a solution B is obtained; a catalyst is added to the solution B, such that a solution C is obtained; the solution C is coated on the basement membrane, and is dried, such that the polydimethylsiloxane permeable vaporized gasoline desulphurization membrane is obtained.

Description

technical field [0001] The invention relates to a polydimethylsiloxane composite membrane used for membrane separation and desulfurization and a preparation method thereof. Background technique [0002] A large number of studies and experiments have shown that the quality of gasoline has an important impact on the performance and emissions of vehicles. To reduce air pollution and produce clean gasoline, reducing the sulfur content in gasoline is a key. As the country pays more and more attention to the environment, relevant environmental protection laws and regulations are becoming more and more stringent and the trend of clean energy development, low-sulfur or even sulfur-free gasoline has become a development trend. Studies have proved that the mercaptan sulfur in catalytic cracking (FCC) gasoline mainly exists in the light fraction (LCN, initial boiling point (IBP) ~ 60 ° C), and thiophene and its derivatives exist in the middle distillate (MCN, 60 ~ 199 ° C) Among them,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D71/70B01D67/00C10G31/11
Inventor 刘庆林孟啸娟
Owner XIAMEN UNIV
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