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Separation and purification device and separation and purification method for butanol and acetone

A technology for purifying butanol and acetone is applied in the biological field to achieve the effects of increasing equipment investment, saving purification energy consumption, and improving production, separation and purification efficiency

Active Publication Date: 2013-02-06
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, there are no reports and related patents on the separation and purification of butanol and acetone using the gas stripping-pervaporation coupling purification method

Method used

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  • Separation and purification device and separation and purification method for butanol and acetone
  • Separation and purification device and separation and purification method for butanol and acetone
  • Separation and purification device and separation and purification method for butanol and acetone

Examples

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preparation example Construction

[0051] Preparation of pervaporation membrane: Polydimethylsiloxane (PDMS) was purchased from Dow Corning, USA. Zeolite nanomaterials (ZSM-5) were purchased from Zeolyst International, USA. ZSM-5 was first dried at 80°C for 24 hours. The gel-forming agent base liquid and curing agent in polydimethylsiloxane (PDMS) are mixed at a ratio of 10:1. For the preparation of a single PDMS polymer membrane, centrifuge directly at 8,000 rpm for 5 min for subsequent operations. For the PDMS mixed membrane with ZSM-5 material added, the ZSM-5 of the specified weight ratio (20% and 80% were selected respectively in Examples 2 and 3 of the present invention) was mixed with the PDMS membrane after the mass ratio of 10:1 The solution was mixed and centrifuged at 8000 rpm for 5 minutes for subsequent operations. The follow-up operation is to ultrasonically treat the film-forming solution for 15 minutes or vacuumize to remove the air bubbles in the film-forming solution, then use a scraper to ...

Embodiment 1

[0062] Example 1: Separation and purification using gas stripping-pervaporation coupling purification method of PDMS polymer membrane

[0063] The cultivation and fermentation of the acetone-butanol-producing bacteria were carried out as described above. When fermentation starts in the stirred bioreactor 2, start the pump 4 to start the cell immobilization system until the end of the fermentation, and at the same time start the low-temperature cooling constant temperature tank 10 to provide the low-temperature condensate for the stripping condenser pipe 8. The self-produced gas produced by the production bacteria during the fermentation process forms bubbles through the fermentation system and enters the stirred bioreactor 2 as stripping gas. The butanol and acetone vapors that are stripped out are condensed after passing through the condenser pipe 8, and the condensate containing butanol and acetone is left to stratify in the condensate storage tank 9, and the upper layer is ...

Embodiment 2

[0069] Example 2: Separation and purification using PDMS / 20%ZSM-5 mixed membrane gas stripping-pervaporation coupled purification method

[0070] Carry out the cultivation and fermentation of acetone butanol producing bacteria by the method among the example 1. For the separation and purification process of air stripping-pervaporation coupling purification method, the pervaporation membrane used is a mixed matrix membrane, which is composed of 20% ZSM-5 nano-zeolite material and polydimethylsiloxane mixed and then cross-linked to form membrane. Nano zeolite is hydrophobic, which can increase the selectivity of the membrane to butanol and increase the concentration of butanol in the membrane permeate. The scanning electron micrograph of the mixed film of PDMS / 20%ZSM-5 is as follows Figure 5 .

[0071] Other than that, other methods are the same as in Example 1, and the parameters of the gas stripping-pervaporation coupling purification device are also the same as in Example...

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Abstract

Disclosed are a separation and purification device and a separation and purification method for butanol and acetone. The separation and purification device comprises a fermentation device and a gas stripping and pervaporation coupling purification device. The separation and purification method implemented by the separation and purification device includes culturing acetone and butanol producing strains at first, and then fermenting the acetone and butanol producing strains to obtain butanol and acetone; performing online separation and purification for the acetone and butanol by gas stripping and pervaporation coupling purification; performing gas stripping for gas generated by the acetone and butanol producing strains during fermentation, filling the gas into a fermentation system to form bubbles, performing gas stripping for the butanol and the acetone in fermentation liquor of the acetone and butanol producing strains, and performing condensation gas stripping by a condensing plant to obtain butanol and acetone; purifying the butanol and the acetone by pervaporation membranes; and recycling permeate of the pervaporation membranes in a condensing mode or directly filling the permeate into a next-stage separation device. Raw material liquid used in the pervaporation process is lower-layer water-phase condensate obtained by gas stripping. The separation and purification device and the separation and purification method have the advantages that the butanol and acetone separation and purification efficiency is effectively improved, and novel technical support is provided for separating and purifying butanol, acetone and products of the butanol and the acetone which are produced by existing biological methods.

Description

technical field [0001] The invention relates to a device and method for separating and purifying butanol and acetone, belonging to the field of biotechnology. Background technique [0002] Butanol, as an important alternative liquid energy source and chemical, can be obtained by microbial fermentation. For details, see the literature: Dürre, P. Biobutanol: an attractive biofuel. Biotechnol. J. 2: 1525–1534, 2007. However, when using Clostridium acetobutylicum or Clostridium beijejerinckii to produce butanol by fermentation, acetone will be produced at the same time. The concentration of butanol at the end point in the fermentation broth is usually not more than 2.0% (w / v), and the concentration of acetone is not more than 1.0% (w / v). In addition, the boiling point of butanol is 117.7°C, which is 100°C higher than the boiling point of water. Therefore, if the traditional rectification or distillation separation method is used, the separation cost is extremely high, it is n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12M1/00C12P7/16C12P7/28C07C31/12C07C29/76C07C49/08C07C45/81C12R1/145C12R1/19
Inventor 薛闯杨尚天白凤武
Owner DALIAN UNIV OF TECH
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