JP2000313885A - Method for clarifying pyroligneous acid by freezing and thawing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively separate constituents and tar from pyroligneous liquid while suppressing heat deterioration, separation, and loss of volatiles by extracting pyroligneous acid from smoke discharged from a charcoal kiln, freezing it by pouring into a freezing container, adding dropwise the thawed product to a recovery container, and clarifying it by filtration. SOLUTION: The extracted pyroligneous acid is stored and poured into a freezing container, and the container is transferred to a refrigeration chamber. As the temperature decreases, the circulation in the liquid can be suppressed, so that the precipitation of fine particles in the tar component can effectively proceed. The freezing treatment is continued until the temperature of the frozen solid is equilibrated with the temperature in the refrigeration chamber. The temperature of the frozen solid is slowly raised to thaw it, and the pyroligneous acid is added dropwise from the frozen solid into a recovery container to recover a molten liquid. The liquid is filtered by means of a filter and clarified. The temperature in the refrigeration chamber is -1 to -500C and controlled according to a staged-temperature method. When the melting treatment proceeds to a certain stage, a small change in the temperature of the added liquid is observed. Eight stages of such change can be distinguished.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for clarifying wood vinegar by freezing and thawing wood vinegar.

[0002]

2. Description of the Related Art Conventionally, wood vinegar is clarified by sedimentation clarification by standing for a long time and clarification by distillation.

[0003]

If the method of leaving wood vinegar liquid for a long time is used for clarification, the substance having a low vaporization temperature is lost, and if the method is carried out by distillation, the component substances are deteriorated. The problem was how to prevent the deterioration of the component materials so that the low-quality materials would not be lost.

[0004]

[MEANS FOR SOLVING THE PROBLEMS] A main vinegar solution is extracted from the flue gas of a charcoal boiler, stored in a wood vinegar solution tank, poured into a wood vinegar solution freezing container, transferred to a freezing compartment, and frozen. Then, proceed to the thawing process, and the frozen solid is dropped into the wood vinegar liquid collecting container, filtered, and clarified.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The control temperature in a freezer compartment is from -1.degree.
It is controlled by the temperature step method in the range of 50 ° C. When the melting process progressed to a certain stage, a small change in the temperature of the dropping liquid was observed, and the change could be distinguished into eight stages. Then, the raw material of the wood vinegar is water charcoal charcoal.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

[0007]

According to the method for clarifying wood vinegar according to the present invention, most of the treatment time proceeds at a low temperature, so that it is possible to effectively separate the component substances inherent in wood vinegar and tar components. In addition, purification and separation by crystallization caused by freezing can suppress deterioration, separation and loss of volatile substances due to heat.

[Brief description of the drawings]

 There is no drawing because it is the invention of the method.

Claims (1)

[Claims] 1. A main vinegar solution is extracted from the flue gas of a charcoal boiler, stored in a main vinegar solution tank, poured into a main vinegar solution freezing container, and the container is moved into a freezer compartment. The knitting flow inside is suppressed, the fine particles in the tar component settle effectively, the freezing of the wood vinegar is completed, the freezing process is advanced until the frozen solid temperature equilibrates with the freezing room temperature, and the process proceeds to the thawing process A method of clarifying wood vinegar by freezing and thawing, in which the temperature of the frozen solid is gradually raised, the wood vinegar is dropped from the frozen solid into a wood vinegar liquid recovery container, the melt is collected, and the mixture is filtered and clarified by a filtration device.