GB/T 37175-2018Coking carbazole (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

1 Scope

This standard specifies the technical requirements, test methods, inspection rules, packaging, transportation, storage and quality certificates, safety attention of coking carbazole. matter.

This standard is applicable to carbazole obtained by using eucalyptus oil in coal tar as raw material, separated by solvent and separated by crystallization.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this document. For undated references, the latest edition (including all amendments) applies to this document.

GB/T 2000 coking solid product sampling method

GB/T 8170 Numerical Rounding Rules and Representation and Determination of Limit Values

3 Technical requirements

The carbazole technical indicators should meet the requirements of Table 1.

4 Test methods

4.1 Appearance. Visual inspection.

4.2 Determination of carbazole content is carried out in accordance with Appendix A.

5 Inspection rules

5.1 The inspection and acceptance of product quality shall be carried out by the quality supervision department.

5.2 For continuous production, the daily packaging quantity shall be one batch, and each batch shall not exceed 200t.

5.3 The sample preparation and preparation shall be carried out in accordance with the provisions of GB/T 2000.

5.4 The product quality index is qualified and judged, and the "repair value comparison method" in GB/T 8170 is adopted.

5.5 Technical requirements of this standard All items in Table 1 are factory inspection items. The results of the factory inspection items do not meet the requirements of this standard. The requirement is to allow a retest of the batch of products. Re-inspection of unqualified items during re-inspection. Retest results even if there is only one indicator If the technical requirements of this standard are not met, the whole batch of products is not qualified. The retest is only performed once.