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Preparation method of pervaporation film with preferential penetration of dimethyl carbonate

A pervaporation membrane and dimethyl carbonate technology, applied in chemical instruments and methods, semi-permeable membrane separation, membrane technology, etc., can solve the problems of restricting the application of DMC, high energy consumption required for separation, and increasing the production cost of DMC. Achieve large throughput, good thermal stability and operational stability, and low price

Inactive Publication Date: 2012-02-15
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, pressurized distillation is mostly used for separation, and the energy consumption required for separation is as high as 60% of the total energy consumption, which greatly increases the production cost of DMC, thus seriously restricting the application of DMC.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] nano-SiO 2 Soluble in acetone, prepare a solution with a mass concentration of 10%, stir to disperse, and add SiO2 dropwise to the solution 2 Octyltrimethoxysilane with a mass of 40%, stirred at 100°C for 6h, filtered, washed with acetone, and dried at 100°C; 20g of vinyl polysiloxane with a viscosity of 100,000mPas and a vinyl content of 0.025mmol / g Alkane (Vi-PDMS), 0.2g of hydrogen-containing silicon oil (H-PDMS), a crosslinking agent with a silicon hydrogen group content of 2mmol / g, was dissolved in 10g of toluene, and 1g of hydrophobic nano-SiO was added 2 , stir well; add 1.2×10 -3 g catalyst platinum (0)-1,3-divinyl-1,1,3,3-tetramethyldisiloxane, scrape film on polysulfone (PS) porous bottom membrane, dry at room temperature for 12h, and Keep drying in an oven at 120°C for 4 hours to make it completely cross-linked and obtain a pervaporation membrane. When the concentration of dimethyl carbonate in the feed liquid is 30wt%, the operating temperature is 40°C, a...

Embodiment 2

[0032] nano-SiO 2 Dissolve in n-hexane, prepare a solution with a mass concentration of 20%, stir and disperse, and add SiO2 dropwise to the solution 2 Octadecyltrichlorosilane with a mass of 50% was stirred at 80°C for 12h, filtered, washed with n-hexane, and dried at 300°C; Siloxane (Vi-PDMS), 0.65g of crosslinking agent hydrogen-containing silicone oil (H-PDMS) with a silicon hydrogen group content of 2mmol / g, dissolved in 20g of n-hexane, adding 0.2g of hydrophobic nano-SiO 2 , stir well; add 3×10 -4g Catalyst platinum (0)-1,3-divinyl-1,1,3,3-tetramethyldisiloxane, scratch film on polyetherimide (PEI) porous bottom film, dry at room temperature 12h, and kept in an oven at 100°C for 6h to make it completely cross-linked to obtain a pervaporation membrane. When the concentration of dimethyl carbonate in the feed liquid is 30wt%, the operating temperature is 40°C, and the absolute pressure behind the membrane is 400Pa, the separation factor of the above membrane is 3.08, a...

Embodiment 3

[0034] nano-SiO 2 Soluble in toluene, prepare a solution with a mass concentration of 30%, stir to disperse, and add SiO2 dropwise to the solution 2 Dodecyltrichlorosilane with a mass of 30%, stirred at 60°C for 24h, filtered, washed with toluene, and dried at 200°C; 10g of vinyl polysilicon with a viscosity of 80,000mPas and a vinyl content of 0.4mmol / g Oxane (Vi-PDMS), 1g of crosslinking agent hydrogen-containing silicone oil (H-PDMS) with a silicon hydrogen group content of 4mmol / g, dissolved in 10g of n-heptane, added 3g of hydrophobic nano-SiO 2 , stir well; add 1×10 -3 g catalyst platinum (0)-1,3-divinyl-1,1,3,3-tetramethyldisiloxane, scrape film on polyvinylidene fluoride (PVDF) porous bottom film, dry at room temperature for 12h , and dried in an oven at 80°C for 10 hours to make it completely cross-linked and obtain a pervaporation membrane. When the concentration of dimethyl carbonate in the feed liquid is 30wt%, the operating temperature is 40°C, and the absolute...

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Abstract

The invention relates to a preparation method of a pervaporation film with the preferential penetration of dimethyl carbonate. Film casting liquid containing vinyl polydimethylsiloxane (Vi-PDMS), hydrogen-containing polydimethylsiloxane (H-PDMS), hydrophobic nano SiO2, a catalyst and a solvent is adopted, a film is coated on an upper layer of a porous ultrafiltration film supported by a polyester non-woven fabric, is aired at room temperature and is also heated, and the cross linkage of the film is finished. An additive type polydimethylsiloxane compound film filled with the hydrophobic nano SiO2, which is obtained by the preparation method of the pervaporation film with the preferential penetration of the dimethyl carbonate, has a simple film preparation process, adopts the materials with low price, strong swelling resistance in dimethyl carbonate / methanol azeotropic liquid, and excellent performance of preferential penetration of the dimethyl carbonate. When the filling mass proportion of the hydrophobic nano SiO2 is 15 percent, the separation factor alpha of the pervaporation film is equal to 3.97, and the penetration flux J is equal to 0.707kg / m2h ([DMC]=30wt%, 40 DEG C).

Description

technical field [0001] The invention relates to the technical field of preparation of pervaporation membranes, in particular to a preparation method of a pervaporation membrane which preferentially passes through dimethyl carbonate. Background technique [0002] Dimethyl carbonate (DMC) is an environmentally friendly chemical. It has excellent solubility properties and is easy to biodegrade, so it can be used as a low-toxicity solvent and is widely used in coatings, medicine, pesticides and other industries. DMC molecules contain various functional groups such as methyl, methoxy, and carbonyl, which can replace phosgene, dimethyl sulfate, etc. as methylating and carbonylating agents to synthesize a variety of green high-tech fine chemicals. At the same time, the oxygen content of DMC molecules is as high as 53%, and it has gradually replaced methyl tert-butyl ether (MTBE) and ethyl tert-butyl ether (ETBE) as gasoline additives to increase the octane number of gasoline and i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/70B01D67/00B01D69/12B01D69/10
Inventor 李继定王蕾秦琳郑冬菊陈剑
Owner TSINGHUA UNIV
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