Industrial n-butanol (3)

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Under the specified conditions, treat the sample with sulfuric acid and compare the displayed color with the same volume of standard colorimetric solution

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Take 100mL sample in a clean and dry Erlenmeyer flask, put it in an ice-water bath to cool for 5 minutes, shake the sample and immediately add 8mL sulfuric acid dropwise with a burette at a rate of 2 drops per second

Take the arithmetic mean of the two parallel determination results as the determination result

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Using phenolphthalein as an indicator, use sodium hydroxide standard titration solution to determine the acidity of the sample

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2 Reagents and solutions

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1 Ethanol ;

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2 Sodium hydroxide standard titration solution: c(NaOH)=0.
05mol/L;

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3 Phenolphthalein indicator solution : 10g/L
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3 Apparatus

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1 Micro burette: 10mL, divided into 0.
02mL or 0.
05mL
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4 Analysis steps

Take 25mL of ethanol into the Erlenmeyer flask, add 2~3 drops of phenolphthalein indicator solution , and neutralize to reddish with sodium hydroxide standard titration solution: Pipette 50.
0mL sample into this Erlenmeyer flask, mix well, and use hydroxide The sodium standard titration solution is titrated to reddish color, and the end point is kept for 30 seconds without fading
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5 Expression of analysis results

The acidity expressed in mass percentage x ₂ ( calculated as acetic acid ), calculated according to formula (2):

Where: c— the actual concentration of sodium hydroxide standard titration solution, mol/L;

V ₁ —The volume of sodium hydroxide standard titration solution consumed by titration, mL;

V ₂ —The volume of the sample, mL;

pt—The density of the sample, g/cm3;

0.
060— The mass of acetic acid expressed in grams equivalent to 1.
00mL sodium hydroxide standard titration solution [c(NaOH)=1.
000mol/L] .

Take the arithmetic mean of the two parallel determination results as the determination result
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The difference between the two parallel determination results shall not be greater than 0.
0005%
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7 Determination of moisture

Use a pipette to draw 10.
0 mL of the sample, and perform the determination according to the method specified in GB/T5283
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Take the arithmetic mean of the two parallel determination results as the determination result, and the difference between the two parallel determination results shall not exceed 0.
02%
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8 Determination of evaporation residue

Measure according to the method specified in GB/T6324.
2
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Take the arithmetic mean of the two parallel determination results as the determination result
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The difference between the two parallel determination results shall not be greater than 0.
001%
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5 Inspection rules

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1 Industrial n-butanol is inspected by the quality supervision department of the production plant
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The manufacturer shall ensure that all manufactured products meet the requirements of this standard
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Each batch of products should be accompanied by a certificate of quality of a certain format, which includes: production plant name and address, product name, lot number, grade, net weight and standard number and so on
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2 For barreled products, a batch of products filled at the same time
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For tanker-loaded products, each tanker-loaded product is a batch
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3 Sampling shall be carried out in accordance with GB/T6678-1986 6.
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1 and GB/T6680.
The total sampling volume shall not be less than 2L, and shall be divided into two dry and clean glass bottles with ground stoppers
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Paste a label on the bottle, indicating: product name, manufacturer name, sampling date and name of the person who took the sample
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One bottle is used for quality inspection, and the other bottle is sealed and stored for one month for inspection
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4 The user shall check the received industrial n-butanol according to the provisions of this standard, and check whether it meets the provisions of this standard
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5 The boiling range is a product control item of fermentation method, and the content of n-butanol is a product control item of synthetic method
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6 The test result is judged according to GB/T1250 rounding value comparison method
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If one indicator of the inspection result does not meet the requirements of this standard, it shall be sampled and inspected again from twice the number of packages.
Even if only one indicator does not meet the requirements of this standard, the whole batch of products will be unqualified
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7 The items listed in this standard are all type inspection items, of which 7 items including chromaticity, density, boiling range, n-butanol content, sulfuric acid color test, acidity, and moisture are ex-factory inspection items
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Under normal circumstances, type inspection shall be carried out at least once every quarter
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8 When there is an objection between the supplier and the buyer on the product quality, the two parties shall negotiate and resolve it
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6 Marking, packaging, transportation and storage

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1 The packaging container should have a firm mark, which includes the name of the manufacturer, site, trademark, product name, batch number, net weight, wood standard number, and a mark of flammable liquid that meets the requirements of GB190
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2 Industrial n-butanol should be packed in dry and clean galvanized steel drums or tank trucks
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The net weight of the barreled product is 150kg per barrel
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3 Industrial n-butanol should be handled with care during loading, unloading and transportation, and avoid sun and rain
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4 Industrial n-butanol should be stored in a dry, ventilated warehouse with a temperature not exceeding 35°C, and there should be no open flames nearby
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7 Security

Industrial n-butanol is flammable, avoid high temperature exposure and contact with open flames
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