Purifying process for solution of wood vinegar

A process method, the technology of wood vinegar, applied in the field of design chemistry, can solve the problems of adverse effects of the use of downstream products, high energy consumption, and the inability to guarantee the original state of natural materials, etc., and achieve pollution control costs, small equipment volume, and easy implementation Effect

Inactive Publication Date: 2009-02-18
HENAN CHEM IND RES INST
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Problems solved by technology

[0005] (1) The energy consumption that is used for heating and distilling is bigger, and every ton of wood vinegar (50% of organic matter content) of purifying and concentrating is processed, and cost is 200 yuan
[0006] (2) Part of the organic su...
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Abstract

The invention relates to a method of the purification technology of pyracetic acid. The method is characterized in that the method comprises the following steps: firstly, the stock solution in a stock solution bath is fed into a two stage pre-filtration system and a two stage secondary precision filtration system which are connected in series to be filtered; secondly, the filtered solution obtained in the first step is fed into multistage membrane separating systems which are connected in series at intervals in sequence and are composed of at least three stage membrane separating devices and three water washing boxes to be separated; wherein, the concentrated water separated through the primary stage membrane separating device is respectively fed into the stock solution bath and a concentrated water tank; the concentrated water separated through the secondary stage membrane separating device is fed into the concentrated water tank through a pipeline; the concentrated water separated through the tertiary stage membrane separating device is respectively fed into the first water washing box and the second water washing box through a pipeline; finally the concentrated pyracetic acid with 50 percent of content is obtained in the concentrated water tank, and the separated fresh water is discharged after being metered through the third water washing box.

Application Domain

Semi-permeable membranesBiofuels +1

Technology Topic

ChemistrySecondary stage +8

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  • Purifying process for solution of wood vinegar

Examples

  • Experimental program(1)

Example Embodiment

[0059] The present invention will be further described below in conjunction with embodiments:
[0060] As shown in the figure, the process method of the present invention includes the following steps: a. First, the raw liquid after precipitation and cooling in the raw liquid tank is sent to a two-stage pre-filtration and two-stage fine filtration system connected in series through a pipeline. Filtering; b. The filtrate obtained in step a is then sent through a pipeline to a multi-stage membrane separation system composed of a three-stage membrane separation device and three washing tanks arranged in series at intervals for separation; wherein, through one The concentrated water separated by the first-stage membrane separation device is sent to the original liquid tank and the concentrated water tank through the pipeline; the concentrated water separated by the second-stage membrane separation device is sent to the concentrated water tank via the pipeline; and the third-stage membrane separation device The separated concentrated water solution is sent to the first washing water tank and the second washing water tank respectively through pipelines; finally, a 50% concentrated wood vinegar solution is obtained in the concentrated water tank, and the separated fresh water is measured and discharged by the third washing water tank.
[0061] The filter membrane in the one-stage membrane separation device of the present invention is a hollow fiber ultrafiltration membrane, the molecular weight cut-off of the ultrafiltration membrane is about 500-500,000, and the approximate value of the corresponding membrane pore size is 0.002μ~0.1μ. The filter membrane in the secondary membrane separation device is a nanofiltration membrane. The nanofiltration membrane is a functional semipermeable membrane that allows solvent molecules or certain low molecular weight solutes or low valence ions to pass through. The size is 1nm, that is, 0.001μm, the molecular weight is above 300, and the filtration accuracy is between ultrafiltration membrane and reverse osmosis membrane. The filter membrane in the three-stage membrane separation device is a reverse osmosis membrane, and the pore size of the reverse osmosis membrane is ≤10×10 -10 m, the separation object is the inorganic matter in the ionic state and most of the organic matter (molecular weight above 50) in the solution.

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