GB/T 2384-2021 in English

VALID

Dyes intermediates—General method for the determination of melting range

Issued on:2021-12-31
Implemented on:2022-07-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $120.00
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Standard No:	GB/T 2384-2021
Document status:	VALID
Title in English:	Dyes intermediates—General method for the determination of melting range
Title in Chinese:	染料中间体熔点范围测定通用方法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2021-12-31
Implemented on:	2022-07-01
Superseding:	GB/T 2384-2015 Dyes intermediates―General method for the determination of melting range
ICS Classification:	71.100.01-Products of the chemical industry in general
Chinese Classification:	G55-Basic standards and general methods for dye
Professional Classification:	GB-National Standard
Related Topics:	melting point Dye intermediate intermediate dye Measuring range in method validation Melting temperature temperature melting point detection range Melting point range gb/t2384 Melting point range melting point range of melting points scope in method validation Method determination range Determination of melting point at melting point melting point melting point Determination of melting point by capillary method Intermediate method Melting point method Melting point utilization Determination of melting point method how to determine melting point Melting point method Melting point measurement method Range of melting point determination Melting point range based on Determination of melting point melting point method some range of melting points solid melting point Alloy melting point determination method Isomer melting point Melting point determination Melting point determination Melting point measurement method Water measuring range General method for determination of melting point range Measuring range of melting point apparatus General method for melting point range Determination method of melting point apparatus GB T2384 Determination method of melting method Melting temperature object melting point Method for Determination of Melting Point of Metals Melting point method Test method and scope flow cytometry Method for Determination of Melting Point of Metals Quantitative measurement range solid eutectic point Method for Determination of Melting Point by Melting Point Apparatus Method of melting point determination Method determination range The melting point range of indium black dot in the middle Various methods for the determination of melting point Quantitative measurement range melting point of solid Universal melting point GBT2384 GB/T 2384-1992 GB/T 2384-2007 GB/T 2384-2015 GB/T 2384-2021 Dye intermediate R salt DSC melting point measurement Ash melting point measurement time Method for determination of melting point of raw materials Melting point national standard detection method Calculation method measuring range Intermediate method requirements The lower limit of determination of the method refers to Dye intermediates group Dissolution measurement method and scope of application Scope of application of qualitative chromatographic methods Chromosome locus representation method Ternary melting point determination method Melting point detection of materials Chinese Pharmacopoeia Melting Point Determination Method Melting point detection method Chinese Pharmacopoeia Melting point determination performed Melting point reference Scope of application of scientific dating methods Method for determining melting point of molten iron

《GB/T 2384-2021染料中间体熔点范围测定通用方法》由TC134（全国染料标准化技术委员会）归口，主管部门为中国石油和化学工业联合会。

Introduction

Core changes in the standard revision

Revision items	2015 version	2021 version	Technical impact
Requirements for thermometers	General requirements are not clarified	Added clause 4.1.3.2	Specifies the conformity verification of JJG130-2011
Heating device	Only describes the basic structure	Clarifies the requirements for electronic controllers	Improves the temperature control accuracy by ±0.5℃
Calculation method	Rounding rules are not specified	GB/T8170-2008 is cited	Uniform data report format

Key instrument technical specifications

Capillary must meet the following requirements: hard No. 11 glass tube with inner diameter of 0.9-1.1mm and wall thickness of 0.10-0.15mm, and the sealing must be treated with low temperature of alcohol lamp.

Melting point tester should meet the accuracy requirements of JJG701-2008 0.2 level, and the heating rate of the metal block heating system should be stable at 1.0℃/min±0.1.

Analysis of key points of operation

4.1.5.1 Sample preparation

Grinding particle size: fine powder that can pass through a 100-mesh sieve
Packing density: free fall compaction 10-15 times to form a 3-4mm dense column
Drying treatment: vacuum drying or oven drying is selected according to product characteristics

4.1.5.3 Observation specification

Initial melting point judgment standard: record the temperature when the first independent droplet appears in the capillary and there is a clear phase interface with the solid phase. The final melting point should be the temperature value at the moment when the last solid particle disappears.

Implementation Suggestions

Laboratory Configuration Plan

Equipment Type	Recommended Model	Accuracy Requirements
Total Immersion Thermometer	WNG-11 Model	±0.1℃
Melting Point Apparatus	X-6 Micro Melting Point Apparatus	Grade 0.2

Common Problem Solving

Selection of Heat Transfer Medium: For samples above 200℃, dimethyl silicone oil DC704 is recommended. Its thermal stability is better than concentrated sulfuric acid and there is no oxidation risk.

Temperature calibration: The fully immersed thermometer needs to be calibrated according to formulas (1)-(3). It is recommended to establish a daily calibration record sheet.

Standard Evolution Analysis

This standard has been revised four times since its first release in 1980. The 2021 version mainly reflects:

Method expansion: The capillary melting point method is added as an optional solution
Safety specifications: Experimental operation warning clauses are added
Digital adaptation: The technical requirements for electronically controlled heating devices are clarified

This standard is coordinated with ISO11357-3:2018 "Plastics Differential Scanning Calorimetry" in the definition of melting range, but special requirements for capillary visual observation are added for the characteristics of dye intermediates.

More samples: YD/T 3934-2021 JJG 21-2008 GB 50021-2001(2009)

Sample only — not a preview of GB/T 2384-2021

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