GB/T 33064-2016Fluorinated olefins for refrigerant use - General method for the determination of chloride (Cl-) (English PDF)

Foreword

This standard is drafted in accordance with the rules given in GB/T 1.1-2009. This standard is proposed by the China Petroleum and Chemical Industry Association. This standard is under the jurisdiction of the National Committee for Standardization of Refrigerants (SAC/TC63/SC9). The drafting of this standard. Zhejiang Chemical Industry Research Institute Co., Ltd., China Petroleum & Chemical Corporation Beijing Chemical Industry Research Institute, Changshu Three love rich in the new chemical materials Co., Ltd. This standard participated in the drafting unit. Zhejiang blue sky environmental high-tech Co., Ltd., Shandong Huaan New Material Co., Ltd., Shandong Dongyue Co., Ltd., Honeywell (China) Co., Ltd., Zhejiang Quhua Fluorine Chemical Co., Ltd., Linhai Limin Chemical Co., Ltd. The main drafters of this standard. Fang Lu, Shi Wanjun, Sun Hai, Liu Hongjian, Huang Yu, Qian Xiaofeng, Pang Yinjuan, Hui Yue, Chenzhou state, Hu Yanfeng. Refrigerants for fluorinated olefins Chloride (Cl-) Determination of common methods

1 Scope

China's national test method for the chloride content of the fluorinated olefins used as refrigerants - the residue of the chlorinated feedstocks and of the hydrogen chloride released in their manufacture, which in a charged system attacks the copper and the steel of the circuit and degrades the lubricant. The standard specifies the general method for determining chloride by the turbidimetric method, covering the sampling of the specimen, the principle of the method, the reagents, the test procedure and the expression of the results. It applies to the determination of chloride in fluorinated olefins for refrigerant use, and the sensitivity of the method is 0.0003 %. The determination works by absorbing the sample into water, acidifying it and adding silver nitrate, so that any chloride present forms a suspension of silver chloride; the turbidity of that suspension is then compared with that of a standard series prepared from a chloride solution of known concentration and treated in the same way, which is what allows so small a quantity to be measured without instrumentation beyond a comparison tube. It is one of a family of general methods issued together for this class of refrigerant, alongside the determination of non-condensable gas, of water, of acidity and of the evaporation residue. Issued on 13 October 2016 and in force since 1 May 2017.

This standard specifies the sampling method of the general test method for the determination of chloride (Cl-) in fluorinated olefins for refrigerants by turbidity method. The principle of the method, Test methods, results, etc. This standard is applicable to the determination of chlorides in fluorinated olefins for refrigerants. The sensitivity of this test method is 0.0003%.

2 Normative reference documents

The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this article Pieces. For undated references, the latest edition (including all modifications) applies to this document. General rules for sampling of liquid chemical products

GB/T 6680-2003 General rules for sampling of gas chemical products GB/T 6681-2003

GB/T 6682 Analytical laboratory water specifications and test methods

3 Principle of the method

Under acidic conditions, the chloride (Cl-) in the fluorinated olefin of the refrigerant reacts with the saturated silver nitrate isopropanol solution to form silver chloride precipitate. Visual inspection of silver chloride was not observed.