Prepn process of hollow chitosam fiber film for pervaporation separation

A technology of pervaporation and chitosan, used in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc. Effect

Inactive Publication Date: 2009-04-29
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these reports mainly use homogeneous membranes to study the characteristics of the materials themselves, and there is still a long way from the industrial scale membrane manufacturing technology, let alone the permeability required by industrial applications.

Method used

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  • Prepn process of hollow chitosam fiber film for pervaporation separation
  • Prepn process of hollow chitosam fiber film for pervaporation separation
  • Prepn process of hollow chitosam fiber film for pervaporation separation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Dissolve 6.5 grams of CS in a 4% acetic acid aqueous solution, and pour it into the spinning tank after standing, filtering, and degassing. A filter is attached to the spinneret, and the filter screen is 250 mesh. The inner / outer diameter of the spinneret is 1.0 / 2.0mm, and the core liquid is a 10% NaOH solution at room temperature. Such as figure 1 ( figure 1 The markings in are: 1—core liquid tank; 2—advection pump; 3—regulating valve; 4—pressure gauge; 5—insulation layer; 6—spinning tank; 7—filter; 8—sprinkler; 9—gel Bath; 10-hollow fiber membrane; 11-membrane storage tank). In the process of spinning hollow fiber membrane, high-pressure nitrogen is used as the pressure source to extrude the casting liquid from the spinneret. At the same time, the core liquid enters the hollow fiber cavity from the center hole of the spinneret under the action of the advection pump as a support and an internal coagulation medium. After the casting solution leaves the spinneret, it passe...

Embodiment 2

[0042] according to Figure 5 Perform pervaporation performance test ( Figure 5 The marks in are: 12—membrane separator; 13—constant flow pump; 14—material liquid tank; 15—receiving bottle; 16—vacuum pump; 17—three-way; 18—low pressure vacuum pump), the process is as follows. Turn on the material-liquid circulation pump to circulate the material-liquid between the material-liquid tank and the membrane separator while heating the material-liquid in the material-liquid tank. When the material liquid temperature is constant at the set temperature, turn on the vacuum pump. Make the system under negative pressure. After permeating for 1 to 4 hours to reach a steady state, record the time, and collect the permeate with a cold trap. Accurately weigh the collected permeate. Measure the composition percentage of the permeate by gas chromatograph. With the azeotrope containing 70wt% methanol / 30wt% dimethyl carbonate as the feed liquid, at 50℃, after membrane separation, the methanol content...

Embodiment 3

[0044] according to Figure 5 The pervaporation performance test was performed, and the process was the same as in Example 2, and the concentration of the material liquid was changed to 10 wt% of methanol, and the above experiment was repeated. The result is as Figure 6 As shown, the methanol content in the permeate reaches 78 wt%.

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Abstract

The present invention is preparation process of hollow chitosan fiber film for pervaporation separation and its application in separating constant boiling complex of methanol and dimethyl carbonate. The hollow fiber film is prepared with chitosan as material and through a polymer phase transforming process of soaking in non-solvent bath, and is used to separate constant boiling complex of methanol and dimethyl carbonate at 20-60 deg.c. The infiltrate after membrane separation has methanol content up to 93 % and total permeation flux up to 420 g / sq m.hr. The hollow chitosan fiber film has great specific surface area, great permeation flux, simple preparation process, and other advantages.

Description

Technical field [0001] The invention relates to a preparation method of a hollow fiber membrane, and in particular to a preparation method of a chitosan hollow fiber membrane for the pervaporation separation of a methanol-dimethyl carbonate mixed liquid. Background technique [0002] Dimethyl carbonate (DMC) is widely used and "green", and is known as the cornerstone of organic synthesis in the 21st century. At present, the production of commercial DMC mainly includes methanol oxidative carbonylation and transesterification production processes. The first products obtained are binary azeotropes formed by methanol and DMC, and their mass composition is: methanol 70%, DMC 30%, which brings difficulties to subsequent separation. Ordinary distillation separation methods are difficult to meet the requirements of product-level separation, and the separation of DMC directly affects the economic benefits of the entire plant, so the research on the separation method of DMC / MeOH azeotrope ...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): B01D71/08B01D63/02
Inventor曹义鸣肖通虎邓麦村袁权
OwnerDALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI