CN106769601B - Method for conveniently determining content of organic acid and wood tar in wood vinegar - Google Patents
Method for conveniently determining content of organic acid and wood tar in wood vinegar Download PDFInfo
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Abstract
The invention discloses a method for conveniently measuring the content of organic acid and wood tar in wood vinegar. Belongs to the technical field of natural product testing and evaluation. The quality of the wood vinegar mainly refers to the content of organic acid, the wood vinegar has good quality and high price when the content is high, and the wood vinegar has good quality when the content is low and the scorched flavor is lighter. At present, the content measurement is carried out by using a gas chromatography-mass spectrometry (GCMS) method with high price, the measurement is complex, the time consumption is high, the price is high, the measurement accuracy is not high, and excessive worthless information is provided, so that the pyroligneous liquor cannot be conveniently and scientifically measured, and further the technical problem that the quality of the pyroligneous liquor cannot be judged is further caused. The method can be used for measuring in a laboratory or an outdoor production base, and only needs to heat a small electric appliance, a magnetic stirrer, a small electronic scale, PH precision test paper, a beaker and the like and put into a suitcase. One person only needs half an hour to complete the measurement of one sample.
Description
Technical Field
The invention relates to a method for conveniently measuring the content of organic acid and wood tar in wood vinegar, belonging to the technical field of natural product testing and evaluation. In particular to a method for rapidly, accurately, cheaply and conveniently measuring the content of organic acid and wood tar in the pyroligneous liquor, which provides the quality and price reference of the pyroligneous liquor.
Background
The pyroligneous liquor is brown liquid substance condensed from gas collected after pyrolysis of wood and its processing residues at normal temperature. Pyroligneous liquor in the present invention is defined as a byproduct obtained by pyrolyzing wood processing residues at high temperature. At present, in the process of processing wood into corresponding charcoal, due to the adoption of a modern machine for high-efficiency production, the byproduct pyroligneous liquor generated in the production process is difficult to form a standard product and difficult to market. At present, the components of the pyroligneous liquor are determined and analyzed by using a Gas Chromatography Mass Spectrometry (GCMS) method with high price, the test is complex, the time consumption is high, the price is high, the test accuracy is greatly influenced by the technique and the proficiency of a tester, the component analysis provides too much worthless information on the quality of the pyroligneous liquor, and the pyroligneous liquor cannot be conveniently and scientifically determined due to the factors, so that the quality of the pyroligneous liquor cannot be judged. The method for burning the charcoal by different enterprises is different and even greatly different, the temperature and the time period for collecting the wood vinegar are also different, so that the quality of the wood vinegar cannot be scientifically judged, and the judgment is only carried out by the sensing methods of pH, color observation and smell, so that the method is very subjective, and the rapid and low-cost scientific determination method cannot be realized. Generally, the quality of the wood vinegar is evaluated by the content of the organic acid, the higher the content is, the better the quality is and the more expensive the price is, and the lower the content is, the lighter the scorched smell is and the better the quality is, so that the quality of one wood vinegar sample is evaluated, and the quality is judged by the above 2 indexes. The method can be used for measuring in a laboratory or an outdoor production base, and only needs to heat a small electric appliance, a magnetic stirrer, a small electronic scale, a PH precision test paper, a beaker and the like to be put into a suitcase. One person only needs half an hour to complete the measurement of one sample.
Disclosure of Invention
The invention aims to overcome the defects of complex test, more time consumption, high price, low test accuracy, excessive and worthless information supply and the like in the prior art, and provides a method for conveniently measuring the content of organic acid and wood tar in pyroligneous liquor, which only needs to heat a small electric appliance, a magnetic stirrer, a small electronic scale, a PH precision test paper, a beaker and the like and put into a suitcase. The measurement of one sample can be completed by one person only in half an hour, the test cost is reduced to half an hour from a few days by a gas chromatography-mass spectrometry (GCMS) method, the cost is reduced to 30 yuan from 3000 yuan per sample, and the measurement can be performed not only indoors but also outdoors.
Parts in this document are parts by weight.
The method for conveniently measuring the content of organic acid and wood tar in the wood vinegar is characterized by comprising the following 5 steps:
1) preparing 1-20% NaOH or KOH alkaline solution with distilled water for later use, weighing 50-500g of pyroligneous liquor (calculated as X g) with a beaker, gradually adding the standby alkaline solution under the condition of continuously stirring until the pH value of the liquor is 5-10 (or using an acid-base potentiometric titrator), metering the volume quantity of the added alkaline liquor, and calculating the mass (gram number) of NaOH or KOH solute as A g;
2) taking the same amount of pyroligneous liquor (counted as X g), putting the pyroligneous liquor into an electric heating drying oven, heating to 90-150 ℃, or blowing hot air to the pyroligneous liquor in a beaker by using an electric heating blower until the liquid is completely volatilized, weighing black residues, namely wood tar, and counting as B g;
3) under the condition of continuously stirring, adding the standby alkali liquor in the step 1) into a beaker containing 2) wood tar until the tar is completely dissolved, measuring the volume quantity of the added alkali liquor, and calculating the mass (gram number) of NaOH or KOH solute to be C gram;
4) calculating the total mass gram number E g (equivalent to acetic acid) and the percentage concentration of the organic acid contained in the pyroligneous liquor according to the chemical reaction equation (CH3COOH + NaOH ═ CH3COONa + H2O; or CH3COOH + KOH ═ CH3COOK + H2O), i.e., E ═ a-C × 60/40 (with NaOH), or E ═ a-C × 60/56 (with KOH);
5) the concentration (calculated as F) of the organic acid (equivalent to acetic acid) contained in the pyroligneous liquor is F ═ E/X × 100%; the content of wood tar is B/X multiplied by 100%
The method for conveniently determining the content of organic acid and wood tar in the pyroligneous liquor is characterized in that distilled water is used for preparing 1-20% of NaOH or KOH alkaline solution for standby, 50-500g of pyroligneous liquor (counted as X g) is weighed by a beaker, the standby alkaline solution is gradually added under the condition of continuous stirring until the pH value of the liquor is 5-10 (or an acid-base potentiometric titrator is used), the volume quantity of the added alkaline liquor is measured, and the mass (gram number) of the NaOH or KOH solute is counted as A g; further optimizing to prepare 2-10% NaOH or KOH alkaline solution with distilled water for standby, weighing 250g of pyroligneous liquor (counted as X g) with a beaker, gradually adding the standby alkaline solution under the condition of continuously stirring until the pH value of the liquid is 6-9 (or using an acid-base potentiometric titrator), metering the volume quantity of the added alkaline liquor, and calculating the mass (grams) of NaOH or KOH solute to be A g.
The method for conveniently measuring the content of the organic acid and the wood tar in the pyroligneous liquor is characterized in that distilled water is used for preparing 2-10% of NaOH or KOH alkaline solution for standby in the first step, 250g of pyroligneous liquor (counted as X g) is weighed by a beaker, the standby alkaline solution is gradually added under the condition of continuous stirring until the pH value of the liquor is 6-8 (or an acid-base potentiometric titrator is used), the volume quantity of the added alkali liquor is measured, and the mass (gram number) of the NaOH or KOH solute is calculated and counted as A g. Further optimizing to prepare 4-5% NaOH or KOH alkaline solution with distilled water for standby, weighing 150-200g pyroligneous liquor (counted as X g) with a beaker, gradually adding the standby alkaline solution under the condition of continuously stirring until the pH value of the liquid is 7-8 (or using an acid-base potentiometric titrator), metering the volume quantity of the added alkaline liquor, and calculating the mass (grams) of NaOH or KOH solute as A g.
The method for conveniently measuring the content of organic acid and wood tar in the pyroligneous liquor is characterized in that in the second step, the pyroligneous liquor is put into an electric heating drying oven for heating and further optimized to 110-120 DEG C
Detailed Description
The present invention will be described in further detail below by way of examples.
Example 1
1) Preparing 1% NaOH alkaline solution with distilled water for later use, weighing 50g of pyroligneous liquor (calculated as X is 50) in a beaker, gradually adding the prepared alkaline solution under the condition of continuously stirring until the pH value of the liquor is 5, measuring the volume quantity of the added alkaline liquor to be 150ml, and calculating the mass (grams) of NaOH solute to be A is 1.50 grams;
2) taking 50g of pyroligneous liquor (calculated as X is 50 g), putting the pyroligneous liquor into an electric heating drying oven, heating to 90 ℃ until the liquid is completely volatilized, weighing black remainder, namely 0.42 g of wood tar, and calculating as B is 0.42 g;
3) adding the spare alkali liquor in the step 1) into a beaker containing 2) wood tar under the condition of continuous stirring until the tar is completely dissolved, measuring the volume quantity of the added alkali liquor by 30ml, and calculating the mass (gram number) of NaOH solute by 0.30 g to be C g (C is 0.30 g);
4) calculating the total mass gram E g (reduced to acetic acid) and percentage concentration of the organic acid contained in the pyroligneous liquor according to the chemical reaction equation (CH3COOH + NaOH ═ CH3COONa + H2O), namely E ═ A-C (A-C) x 60/40 ═ 1.50-0.30 x 60/40 ═ 1.8 g;
5) the concentration (calculated as F) of organic acid (equivalent to acetic acid) contained in the pyroligneous liquor is F ═ E/X × 100 ═ 1.8/50 × 100 ═ 3.6%; the content of wood tar is 0.42/50 × 100%
The wood vinegar solution has organic acid content (calculated by acetic acid) of 3.6% and wood tar content of 0.84%.
Example 2
1) Preparing 2% NaOH alkaline solution with distilled water for later use, weighing 100g of pyroligneous liquor (calculated as X is 100) in a beaker, gradually adding the prepared alkaline solution under the condition of continuously stirring until the pH value of the liquor is 6, measuring the volume quantity of the added alkaline liquor to be 216ml, and calculating the mass (grams) of NaOH solute to be A is 4.32 g;
2) 100g of pyroligneous liquor (calculated as X is 100 g) is taken, the pyroligneous liquor is put into an electric heating drying oven to be heated to 100 ℃ until the liquid is completely volatilized, and black remainder, namely wood tar is weighed to be 1.44 g, and calculated as B is 1.44 g;
3) adding the spare alkali liquor in the step 1) into a beaker containing 2) wood tar under the condition of continuous stirring until the tar is completely dissolved, measuring the volume quantity of the added alkali liquor by 42ml, and calculating the mass (gram number) of NaOH solute by 0.84 g to be C g (C is 0.84 g);
4) calculating the total mass gram E g (reduced to acetic acid) and percentage concentration of the organic acid contained in the pyroligneous liquor according to the chemical reaction equation (CH3COOH + NaOH ═ CH3COONa + H2O), namely E ═ A-C (60/40) ═ 4.32-0.84 × (60/40) ═ 5.22 g;
5) the concentration (calculated as F) of the organic acid (equivalent to acetic acid) contained in the pyroligneous liquor is F ═ E/X × 100 ═ 5.22/100 × 100 ═ 5.22%; the content of wood tar is B/X100%: 1.44/100X 100%: 1.44%
The wood vinegar solution has organic acid content (calculated by acetic acid) of 5.22% and wood tar content of 1.44%.
Example 3
1) Preparing 4% NaOH alkaline solution with distilled water for later use, weighing 200g of pyroligneous liquor (calculated as X is 200) in a beaker, gradually adding the prepared alkaline solution under the condition of continuously stirring until the PH of the liquor is 7, measuring the volume quantity of the added alkaline liquor to be 325ml, and calculating the mass (grams) of NaOH solute to be A is 13 grams;
2) taking 200g of pyroligneous liquor (calculated as X is 200 g), putting the pyroligneous liquor into an electric heating drying oven, heating to 110 ℃ until the liquid is completely volatilized, weighing 3.9 g of black remainder namely wood tar, and calculating as B is 3.9 g;
3) adding the spare alkali liquor in the step 1) into a beaker containing 2) wood tar under the condition of continuous stirring until the tar is completely dissolved, measuring the volume quantity of the added alkali liquor by 52ml, and calculating the mass (gram number) of NaOH solute by 2.08 g to obtain C g (2.08 g);
4) calculating the total mass gram E g (reduced to acetic acid) and percentage concentration of the organic acid contained in the pyroligneous liquor according to the chemical reaction equation (CH3COOH + NaOH ═ CH3COONa + H2O), namely E ═ A-C (60/40) ═ 13-2.08 (x 60/40 ═ 18.33 g;
5) the concentration (calculated as F) of the organic acid (equivalent to acetic acid) contained in the pyroligneous liquor is F ═ E/X × 100 ═ 14.1/200 × 100 ═ 9.17%; the content of wood tar is B/X100%: 3.0/200X 100%: 1.95%
The wood vinegar solution has organic acid content (calculated by acetic acid) of 9.17% and wood tar content of 1.95%.
Example 4
1) Preparing 10% NaOH alkaline solution with distilled water for later use, weighing 250g of pyroligneous liquor (calculated as X is 250) with a beaker, gradually adding the alkaline solution for later use under the condition of continuously stirring until the pH value of the liquor is 8, measuring the volume quantity of the added alkaline liquor to be 195ml, and calculating the mass (grams) of NaOH solute to be 19.5 g;
2) taking 250g of pyroligneous liquor (calculated as X is 250 g) in equal amount, putting the pyroligneous liquor into an electric heating drying oven, heating the pyroligneous liquor to 120 ℃ until the liquid is completely volatilized, weighing 3.9 g of black remainder namely wood tar, and calculating as B is 3.9 g;
3) adding the spare alkali liquor in the step 1) into a beaker containing 2) wood tar under the condition of continuous stirring until the tar is completely dissolved, measuring the volume quantity of the added alkali liquor to be 41.6ml, and calculating the mass (gram number) of NaOH solute to be 4.16 g and calculating the mass to be C g (C is 4.16 g);
4) calculating the total mass gram E g (reduced to acetic acid) and percentage concentration of the organic acid contained in the pyroligneous liquor according to the chemical reaction equation (CH3COOH + NaOH ═ CH3COONa + H2O), namely E ═ A-C (60/40 ═ 19.5-4.16) × 60/40 ═ 23.1 g;
5) the concentration (calculated as F) of organic acid (equivalent to acetic acid) contained in the pyroligneous liquor is F ═ E/X × 100 ═ 23.1/250 × 100 ═ 9.24%; the content of wood tar is B/X100%: 4.16/250X 100%: 1.66%
The wood vinegar has organic acid content (calculated by acetic acid) of 9.24% and wood tar content of 1.66%.
Example 5
1) Preparing 20% NaOH alkaline solution with distilled water for later use, weighing 500g of pyroligneous liquor (calculated as X is 500) in a beaker, gradually adding the prepared alkaline solution under the condition of continuously stirring until the PH value of the liquor is 9, measuring the volume quantity of the added alkaline liquor to be 440ml, and calculating the mass (gram) of NaOH solute to be A is 88 g;
2) 500g of pyroligneous liquor (calculated as X is 500 g) is taken and put into an electric heating drying oven to be heated to 120 ℃ until the liquid is completely volatilized, and the black remainder, namely the wood tar, is weighed to be 16.5 g, and is calculated as B is 16.5 g;
3) adding the spare alkali liquor in the step 1) into a beaker containing 2) wood tar under the condition of continuous stirring until the tar is completely dissolved, measuring the volume quantity of the added alkali liquor by 110ml, and calculating the mass (gram number) of NaOH solute by 22 g to obtain C g (C is 22 g);
4) calculating the total mass gram E g (reduced to acetic acid) and the percentage concentration of the organic acid contained in the pyroligneous liquor according to the chemical reaction equation (CH3COOH + NaOH ═ CH3COONa + H2O), namely E ═ A-C (60/40) ═ 88-22 (60/40) × 99 g;
5) the concentration (calculated as F) of the organic acid (equivalent to acetic acid) contained in the pyroligneous liquor is F, E/X × 100%, 99/500 × 100%, 19.8%; the content of wood tar is 16.5/500 × 100%
The wood vinegar solution has an organic acid content (calculated as acetic acid) of 19.8% and a wood tar content of 3.3%.
Example 6
1) Preparing 1% KOH alkaline solution with distilled water for later use, weighing 50g of pyroligneous liquor (calculated as X is 50) in a beaker, gradually adding the prepared alkaline solution under the condition of continuous stirring until the pH value of the liquor is 5, measuring the volume quantity of the added alkaline liquor to be 137.5ml, and calculating the mass (grams) of KOH solute to be A is 1.38 g;
2) taking 50g of pyroligneous liquor (calculated as X is 50 g) with the same amount, putting the pyroligneous liquor into an electric heating drying oven, heating the pyroligneous liquor to 90 ℃ until the liquid is completely volatilized, weighing 0.39 g of black remainder namely wood tar, and calculating as B is 0.39 g;
3) adding the spare alkali liquor in the step 1) into a beaker containing 2) wood tar under the condition of continuous stirring until the tar is completely dissolved, measuring the volume quantity of the added alkali liquor to be 28ml, and calculating the mass (gram number) of KOH solute to be 0.28 g and calculating the mass (gram number) of the KOH solute to be C g (C is 0.28 g);
4) calculating the total mass gram E g (reduced to acetic acid) and percentage concentration of the organic acid contained in the pyroligneous liquor according to the chemical reaction equation CH3COOH + KOH-CH 3COOK + H2O, namely E-A-C x 60/56-1.38-0.28-60/56-1.18 g;
5) the concentration (calculated as F) of organic acid (equivalent to acetic acid) contained in the pyroligneous liquor is F ═ E/X × 100 ═ 1.18/50 × 100 ═ 2.36%; the content of wood tar is 0.39/50 × 100%
The wood vinegar solution has organic acid content (calculated by acetic acid) of 2.36% and wood tar content of 0.78%.
Example 7
1) Preparing 2% KOH alkaline solution with distilled water for later use, weighing 100g of pyroligneous liquor (calculated as X is 100) by using a beaker, gradually adding the prepared alkaline solution under the condition of continuously stirring until the PH value of the liquor is 6, measuring the volume quantity of the added alkaline liquor to be 220ml, and calculating the mass (gram number) of KOH solute to be A is 4.4 g;
2) 100g of pyroligneous liquor (calculated as X is 100 g) is taken, the pyroligneous liquor is put into an electric heating drying oven to be heated to 100 ℃ until the liquid is completely volatilized, and black residues, namely 1.32 g of wood tar, are weighed, and the calculated amount is 1.32 g of B;
3) adding the spare alkali liquor in the step 1) into a beaker containing 2) wood tar under the condition of continuous stirring until the tar is completely dissolved, measuring 39ml of the volume quantity of the added alkali liquor, and calculating the mass (gram number) of NaOH solute to be 0.78 g and calculating the mass to be C g (C is 0.78 g);
4) calculating the total mass gram E g (reduced to acetic acid) and percentage concentration of the organic acid contained in the pyroligneous liquor according to the chemical reaction equation (CH3COOH + KOH ═ CH3COOK + H2O), i.e. E ═ A-C (A-C) x 60/56 ═ 4.4-0.78) x 60/56 ═ 3.88 g;
5) the concentration (calculated as F) of organic acid (equivalent to acetic acid) contained in the pyroligneous liquor is F ═ E/X × 100 ═ 3.88/100 × 100 ═ 3.88%; the content of wood tar is 1.32% by weight, 100% by weight, 1.32% by weight
The wood vinegar solution has organic acid content (calculated by acetic acid) of 3.88% and wood tar content of 1.32%.
Example 8
1) Preparing 4% KOH alkaline solution with distilled water for later use, weighing 200g of pyroligneous liquor (calculated as X is 200) in a beaker, gradually adding the alkaline solution for later use under the condition of continuous stirring until the PH of the liquor is 7, measuring the volume quantity of the added alkaline liquor to be 360ml, and calculating the mass (grams) of NaOH solute to be A is 14.4 grams;
2) taking 200g of pyroligneous liquor (calculated as X is 200 g), putting the pyroligneous liquor into an electric heating drying oven, heating to 110 ℃ until the liquid is completely volatilized, weighing 3.6 g of black remainder namely wood tar, and calculating as B is 3.6 g;
3) adding the spare alkali liquor in the step 1) into a beaker containing 2) wood tar under the condition of continuous stirring until the tar is completely dissolved, metering the volume quantity of the added alkali liquor to be 48ml, and calculating the mass (gram number) of KOH solute to be 1.92 g and then calculating the mass (gram number) of the KOH solute to be C g (C is 1.92 g);
4) calculating the total mass gram E g (reduced to acetic acid) and percentage concentration of organic acid in the pyroligneous liquor according to the above chemical reaction equation (CH3COOH + KOH ═ CH3COOK + H2O), i.e. E ═ a-C × 60/56 ═ 14.4-1.92 × 60/56 ═ 13.37 g;
5) the concentration (calculated as F) of the organic acid (equivalent to acetic acid) contained in the pyroligneous liquor is F ═ E/X × 100 ═ 13.37/200 × 100 ═ 6.69%; the content of wood tar is B/X100%: 3.6/200X 100%: 1.8%
The wood vinegar solution has an organic acid content (calculated as acetic acid) of 6.69% and a wood tar content of 1.8%.
Example 9
1) Preparing 10% KOH alkaline solution with distilled water for later use, weighing 250g of pyroligneous liquor (calculated as X is 250) in a beaker, gradually adding the alkaline solution for later use under the condition of continuous stirring until the PH value of the liquor is 8, measuring the volume quantity of the added alkali liquor to be 300ml, and calculating the mass (grams) of NaOH solute to be A is 30 g;
2) taking 250g of pyroligneous liquor (calculated as X is 250 g), putting the pyroligneous liquor into an electric heating drying oven, heating to 120 ℃ until the liquid is completely volatilized, weighing 3.6 g of black remainder namely wood tar, and calculating as B is 3.6 g;
3) adding the spare alkali liquor in the step 1) into a beaker containing 2) wood tar under the condition of continuous stirring until the tar is completely dissolved, metering the volume quantity of the added alkali liquor to be 42ml, and calculating the mass (gram number) of KOH solute to be 4.2 g and counting as C g (C is 4.2 g);
4) calculating the total mass gram E g (reduced to acetic acid) and percentage concentration of organic acid in the pyroligneous liquor according to the above chemical reaction equation (CH3COOH + KOH ═ CH3COOK + H2O), i.e. E ═ a-C × 60/56 ═ 30-4.2 × 60/56 ═ 27.64 g;
5) the concentration (calculated as F) of organic acid (equivalent to acetic acid) contained in the pyroligneous liquor is F, E, X, 100%, 27.64, 250, 100%, 11.08%; the content of wood tar is B/X100%: 3.6/250X 100%: 1.44%
The wood vinegar solution has organic acid content (calculated by acetic acid) of 11.08% and wood tar content of 1.44%.
Example 10
1) Preparing 20% KOH alkaline solution with distilled water for later use, weighing 500g of pyroligneous liquor (calculated as X is 500) in a beaker, gradually adding the prepared alkaline solution under the condition of continuously stirring until the PH value of the liquor is 9, measuring the volume quantity of the added alkaline liquor to be 550ml, and calculating the mass (grams) of NaOH solute to be A is 110 g;
2) 500g of pyroligneous liquor (calculated as X is 500 g) is taken and put into an electric heating drying oven to be heated to 120 ℃ until the liquid is completely volatilized, and the black remainder, namely the wood tar, is weighed to be 16.5 g, and is calculated as B is 16.5 g;
3) adding the spare alkali liquor in the step 1) into a beaker containing 2) wood tar under the condition of continuous stirring until the tar is completely dissolved, metering the volume quantity of the added alkali liquor to be 140ml, and calculating the mass (gram number) of KOH solute to be 28 grams and calculating the mass to be C grams (C is 28 grams);
4) calculating the total mass gram E g (reduced to acetic acid) and percentage concentration of organic acid in the pyroligneous liquor according to the above chemical reaction equation (CH3COOH + KOH ═ CH3COOK + H2O), i.e. E ═ a-C × 60/56 ═ 110-28 × 60/56 ═ 87.86 g;
5) the concentration (calculated as F) of organic acid (equivalent to acetic acid) contained in the pyroligneous liquor is F, E/X × 100%, 87.86/500 × 100%, 17.57%; the content of wood tar is 16.5/500 × 100%
The wood vinegar solution has an organic acid content (calculated as acetic acid) of 17.57% and a wood tar content of 3.3%.
The following experiments show the comparison between the above-mentioned test effect of the invention and the results of the conventional test method
TABLE. comparison of organic acid (in acetic acid) and wood tar content by methods of examples 1-10
The data in the table show that the data of the organic acid content and the wood tar content of the pyroligneous liquor of different samples in examples 1 to 10 are compared with the data of the traditional test method to be approximate, the error is within 95 percent, and the method is good for the test accuracy.
Claims (3)
1. A convenient method for determining the content of organic acid and wood tar in wood vinegar is characterized in that the first step of the method is to prepare 1-20% KOH alkaline solution with distilled water for standby, 50-500g wood vinegar is weighed by a beaker, the calculated amount is X g, the standby alkaline solution is gradually added under the condition of continuous stirring until the pH value of the liquid is 5-10, the volume amount of the added alkaline solution is measured, and the mass gram of the solute KOH is calculated as A g; then, the second step is carried out, namely weighing X g of pyroligneous liquor which is equal to the amount of the pyroligneous liquor obtained in the first step, blowing hot air to the pyroligneous liquor in a beaker by using an electric heating blower until the liquor is completely volatilized, and weighing B g of black remainder namely wood tar; adding the standby alkali liquor in the first step into the beaker of the wood tar in the second step under the condition of continuously stirring until the tar is completely dissolved, measuring the volume quantity of the added alkali liquor, and calculating the mass gram of KOH solute, wherein the mass gram is calculated as C gram; the fourth step is to calculate the total weight gram E g of organic acid contained in the pyroligneous liquor, namely the total weight gram E g and percentage content of the organic acid in the pyroligneous liquor, according to a chemical reaction equation CH3COOH+KOH＝CH3COOK+H2O, E ═ (a-C) × 60/56; the fifth step is that the content of organic acid in the wood vinegar solution is F, F is E/X multiplied by 100%, and the content of wood tar is B/X multiplied by 100%.
2. The method as claimed in claim 1, wherein the first step is to use distilled water to prepare 2-10% KOH alkaline solution for standby, use a beaker to weigh 250g of wood vinegar, and count X g, gradually add the standby alkaline solution while stirring until the pH of the solution is 6-9, measure the volume of the added alkaline solution, and calculate the mass gram of KOH solute as A g.
3. The method as claimed in claim 1, wherein the first step is to use distilled water to prepare 4-5% KOH alkaline solution for standby, use a beaker to weigh 200g of pyroligneous liquor, and count X g, gradually add the standby alkaline solution while stirring until the pH of the liquor is 7-8, measure the volume of the added alkaline solution, and calculate the mass gram of KOH solute as A g.
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Citations (5)
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