GB/T 38729-2020 in English

VALID

Surface active agents—Test methods of technical sodium primary alkylsulphates

Issued on:2020-04-28
Implemented on:2020-11-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $160.00
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Standard No:	GB/T 38729-2020
Document status:	VALID
Title in English:	Surface active agents—Test methods of technical sodium primary alkylsulphates
Title in Chinese:	表面活性剂工业伯烷基硫酸钠试验方法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2020-04-28
Implemented on:	2020-11-01
ICS Classification:	71.100.40-Surface active agents
Chinese Classification:	G72-Basic standards and general methods for surface active agent
Professional Classification:	GB-National Standard
Related Keywords:	technical sodium standard test items method basis technical improvement ph value determination gb/t active agents test methods technical differences main improvements sodium chloride determination
Related Topics:	Surfactant alkyl Sodium Alkyl Sulfate sodium sulfate Sodium sulfate test Analysis method of industrial sodium sulfate Alkyl activity Reagent table Sodium Alkyl Sulfate table reagent table Sulfuric acid activated carbon test sulfuric acid Sodium Sulfate Qualitative Method Reagent table active and inactive sulfur surface acid sites surface acid sites Sodium Lauryl Sulfate Surfactant Sodium Lauryl Sulfate Surfactant acidic surface Sodium Decyl Sulfate Surfactant Analysis Methods Sodium Sulfate Test Method sodium sulfate method sodium sulfate method Inactive sulfur agent and active sulfur agent Sodium Sulfate Oriental Titanium Annual Sulfuric Acid active sulfur cluster GBT38729 GB/T 38729-2020 Industrial desulfurizer Sodium sulfate body test method Industrial Sulfuric Acid Test Method Sodium sulfate detection method Industrial surfactant testing Surfactant industry Industrial sodium sulfate analysis method standard number Sodium sulfate identification method Industrial sodium sulfate detection method Detection method of dodecyl primary amine Industrial reagent sodium amide detection National standard test method for industrial concentrated sulfuric acid

《GB/T 38729-2020表面活性剂工业伯烷基硫酸钠试验方法》由TC272（全国表面活性剂和洗涤用品标准化技术委员会）归口，主管部门为中国轻工业联合会。

Introduction

Interpretation of the core content of the standard

Test items	Method basis	Technical improvement
pH value determination	GB/T 6368	Measured using 10% solution, sample is unstable when pH < 7
Petroleum ether extractables	Appendix A	Increase the number of extractions to 5 times, and clarify the temperature control requirements
Fatty alcohol content	Appendix B	Optimize the acid hydrolysis reflux time to 4 hours

Key technical differences

Main improvements of this standard compared with ISO 894:1977:

Ethanol concentration is adjusted to 95% (not specified in the original standard)
Sodium chloride determination is changed to GB/T 3050 potentiometric titration method
Acetone is added as washing solvent

Key points of experimental operation

Key steps of petroleum ether extraction

Sample dissolution needs to be maintained in a 70℃ water bath
Ethanol is added to demulsify during stratification
The residue needs to be dried with controlled air flow at 30℃

Implementation suggestions

Laboratories should pay attention to:

When the water content is greater than 5%, azeotropic distillation is preferred
Before determining the total alkalinity, it is necessary to confirm that the pH is greater than 7 and the free base is greater than 0.3
Ether extraction must be performed in a fume hood

More samples: DL/T 5154-2012 JGJ 94-2008 GB 18306-2015

Sample only — not a preview of GB/T 38729-2020

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