Maleic Anhydride for Industrial Use (3)

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4.

The molten maleic anhydride sample was heated at a preset temperature for 2 hours, and compared with the platinum-cobalt color scale

4.

Platinum and cobalt standard colorimetric fluid: prepared according to the provisions of GB/T3143-1982 towels

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When the temperature of the electric heating block is 140℃, put the Nessler colorimetric tube used for measuring the melting color with the sample into the electric heating block, and surround the top of the hole with a small glass wool ring to support the sodium The colorimetric tube is in a vertical position and the space between the Nessler colorimetric tube and the heating block is closed.

Note 1: Put a small amount of glass wool at the bottom of each hole to prevent the Nessler tube and thermometer from being broken

Note 2: If the molten sample contains visible turbidity, this test method cannot be used

4.

According to the provisions of GB/T3143-1982

5 Inspection rules

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5.

a) The main raw materials have changed;

b) When there are major changes in the process, which may affect the performance of the product;

c) When production resumes after a long-term suspension of production;

d) There is a big difference between the factory inspection result and the last type inspection;

e) Contract stipulations
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5.
1.
2 The factory inspection items are the maleic anhydride content, melting color, crystallization point, ignition residue, and iron content in Table 1 , which should be inspected batch by batch
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5.
2 The quality of each batch of maleic anhydride products for industrial use shall not exceed 60t
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For block products, the maximum size of each piece should not exceed 5cm
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5.
3 The number of maleic anhydride sampling units for industrial use shall be determined in accordance with 7.
6.
1 of GB/T6678-2003
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5.
4 The sampling method of maleic anhydride for industrial use shall be carried out in accordance with the provisions of GB/T6679-2003
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The sampling amount shall not be less than 500g, and the mixture shall be divided into two parts, sealed, protected from light, and labelled, indicating the product name, batch number, sampling date, sampling location, and the name of the person who took the sample
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One is for inspection and the other is kept as a sample for three months
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5.
5 When measuring maleic anhydride for industrial use, the sample should be placed in a dry mortar and quickly pulverized, mixed evenly, to avoid water vapor intrusion
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5.
6 Maleic anhydride for industrial use shall be inspected by the quality supervision and inspection department of the manufacturer
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The manufacturer shall ensure that the 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 certain formats, including: manufacturer name, product name, date of production or batch number, product grades and standard number and so on
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5.
7 The test result is judged according to the rounding value comparison method in GB/T1250
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If one of the inspection results does not meet the requirements of this standard, samples should be taken from twice the volume of the packaging unit for re-inspection.
Even if only one index does not meet the requirements of this standard, the entire batch of products should be re-inspected.
Do disqualification treatment
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6 Marking, packaging, transportation and storage

6.
1 Industrial maleic anhydride on the container should be strong mark, indicating the product name, manufacturer name and address, trademark, production date or production lot number, product level, net content and standard number and so on
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6.
2 For industrial maleic anhydride packaging, use a plastic woven bag or kraft paper bag that meets GB/T8946, lined with a polyethylene plastic bag that meets GB/T4456, and the plastic bag mouth is heat-sealed or tied with a rope
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The net content of each package is 25kg, 500kg, or according to user requirements
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6.
3 When transporting industrial maleic anhydride, it should be packed in a clean and dry transportation tool.
It should not be mixed with acids and alkalis or contact with oxidizing and corrosive substances to avoid product deterioration
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Be careful to handle it carefully during transportation to prevent damage to the packaging bag
.

6.
4 Maleic anhydride for industrial use should be stored in a dry, clean and ventilated warehouse, fire-proof, moisture-proof, rain-proof, and sun-proof.
Do not mix with acids and alkalis or contact with oxidizing and corrosive substances to avoid product deterioration , The warranty period is 3 months from the date of leaving the factory.
After the expiration date, it can still be used if it meets the requirements of this standard
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