Industrial acetone (4)

4.

For chromatographic reference operating conditions, see Appendix C (reminder appendix)

4.

Thermal conductivity gas chromatograph

4.

a) Instrument sensitivity: Using hydrogen as the carrier gas, the sensitivity to methanol should be better than 500mV·mL/mg

b) Instrument stability: Under the condition of unchanged operating conditions, the instrument runs continuously for 8 hours, and the difference in the retention value of the chromatographic peak shall not exceed 15%

4.

Turn on the instrument according to the instrument operating procedures, strictly control the operating conditions, and wait for the instrument to stabilize before measuring

4.

Calculate according to the corrected area normalization method

The content of water, methanol , and ethanol in acetone is expressed in mass percentage Xi, calculated according to formula (2):

In the formula: the percentage of Xi-i component;

Ai—i component peak area;

The mass correction factor value of fi-i component

4.

4.

4.

In the formula: f _i- the mass correction factor of the i component;

A—Acetone peak area;

A _{i —} the peak area of ​​the _i component;

m—mass percentage of acetone;

m _i —the mass percentage of _i component

4.
8.
5 Allowance

The difference between the two results of parallel determination is not more than 0.
03%, and the arithmetic mean is taken as the determination result
.

4.
9 Purity

The purity of internal ketone is expressed by mass percentage X ₂ and calculated according to formula (4):

X ₂ =100%-(water%+acid%+alcohol%).
.
.
.
.
.
(4)

Acid %, Water %, Alcohol% are obtained from 4.
5 and 4.
8
.

5 Inspection rules

5.
1 Industrial acetone should be inspected by the quality inspection department of the manufacturer, and the manufacturer should ensure that all industrial acetone delivered from the factory meets the requirements of this standard
.
Each batch of industrial acetone should be accompanied by a quality certificate in a certain format
.
The content includes: the name of the manufacturer, the address, the name of the product, the grade, the batch number, the date of inspection, the net weight of the product, and the number of this standard
.

5.
2 Batch formation: batch formation can be carried out according to production cycle, production shift or product storage tank
.

5.
3 The user has the right to check and accept the quality of the industrial acetone received in accordance with the inspection rules and test methods specified in this standard, and whether its indicators meet the requirements of this standard
.

5.
4 Sampling method: in accordance with the corresponding regulations in Chapter 2 of GB/T6680 "liquids with flow dynamics at room temperature"
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When packing in barrels, the number of sampling barrels should be sampled according to the regulations in GB/T6678, and the total amount of samples taken shall not be less than 1L
.

5.
5 After the selected samples are fully mixed, the same amount is put into two clean, dry glass bottles with ground stoppers, and a label is attached to indicate: the name of the manufacturer, the name of the product, the batch number and the date of sampling, one The bottles are for inspection and analysis, and one bottle is kept for two months for inspection
.

5.
6 If one index of the inspection result does not meet the requirements of this standard, double the number of packaging samples shall be re-selected for inspection, and even if one of the indexes does not meet the requirements of this standard, the entire batch of products shall be unqualified
.

5.
7 When there is a dispute between the supplier and the buyer about the product quality and needs to be resolved, the user shall submit an arbitration within one month from the date of the product arrival.
The arbitration unit can be selected by agreement between the two parties and the inspection shall be carried out in accordance with the provisions of the wooden standard
.

5.
8 The judgment of the test result shall be carried out according to GB/T1250 rounding value comparison method
.

5.
9 The items of evaporation residue, density and water miscibility are type inspection items, which shall be inspected every two weeks
.

6 Marking, packaging, transportation and storage

6.
1 There should be a firm mark on the packaging container, which includes: registered trademark, manufacturer name, product name, grade, batch number, net weight, and the mark of flammable items in accordance with GB190
.

6.
2 Industrial acetone should be packed in dry and clean galvanized drums or tank trucks
.
The net weight of the drum is 160kg
.

6.
3 During loading, unloading and transportation, violent impact should be avoided, and the sun and rain should be avoided
.

6.
4 Industrial ketones should be stored in a dry, ventilated, fire-proof and explosion-proof warehouse with a temperature below 35°C
.

7 Security

Acetone is a highly flammable and volatile product, so please keep it away from fire sources when using it
.