GB/T 33066-2016Fluorinated olefins for refrigerant use - General method for the determination of high-boiling residues (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., Changshu three love rich in the new chemical materials Co., Ltd., China Petrochemical Beijing Chemical Industry Research Institute. This standard to participate in the drafting unit. Zhejiang blue sky environmental high-tech Co., Ltd., Zhejiang Qu fluoride Chemical Co., Ltd., Shandong Dongyue Co., Ltd., Shandong Huaan New Material Co., Ltd., Honeywell (China) Co., Ltd., Jiangsu Meilan Chemical Co., Ltd., Linhai Limin Chemical Co., Ltd. The main drafters of this standard. Fang Lu, Shi Wanjun, Li Qiuzhen, Ge Spring Lee, Long Kui, Wang Chen Qian, Hui Yue, Liu Hongjian, Hu Yanfeng, Huang Yu. Determination of volatile residues of fluorinated olefins for refrigerants General method

1 Scope

China's national test method for the evaporation residue of the fluorinated olefins used as refrigerants - the heavy, high boiling matter left behind when the fluid itself has gone, which in a charged system collects in the evaporator, fouls the heat transfer surface and blocks the expansion device. The standard specifies the general method for determining the high-boiling residue by the evaporation method, covering the sampling of the specimen, the principle of the method, the apparatus, the test procedure and the allowable difference. It applies to the determination of the evaporation residue in fluorinated olefins for refrigerant use, and the sensitivity of the method is 0.0001 %. A weighed quantity of the refrigerant is allowed to evaporate under controlled conditions from a vessel that has itself been brought to constant mass, and what remains is weighed; the residue is calculated as a mass fraction of the sample taken. Because the quantity being measured is a millionth part of the sample, the standard is largely about the conditions that make so small a difference in mass meaningful - the preparation and constant mass of the vessel, the rate and completeness of the evaporation, and the handling of the residue before weighing. It is one of a family of general methods issued together for this class of refrigerant, alongside the determination of non-condensable gas, of chloride, of water and of acidity. Issued on 13 October 2016 and in force since 1 May 2017.

This standard specifies the use of dry reduction method for the determination of volatile residues in fluorinated olefins for the general test method of sampling, the original method Rationale, test method, allowable difference. This standard applies to the determination of the evaporation residue in fluorinated olefins for refrigerants. The sensitivity of this test method is 0.0001%.

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

The sample was evaporated and the mass of the residue was weighed and the evaporation residue was calculated.