Standard No.:	GB/T 23938-2021
English Name:	High purity carbon dioxide
Chinese Name:	高纯二氧化碳
Chinese Classification:	G86    Industrial gas and chemical gas
Professional Classification:	GB    National Standard
ICS Classification:	71.100.20 71.100.20    Gases for industrial application 71.100.20
Issued by:	SAMR; SAC
Issued on:	2021-08-20
Implemented on:	2022-5-1
Status:	valid
Superseding:	GB/T 23938-2009 High purity carbon dioxide
Language:	English
File Format:	PDF
Word Count:	8500 words
Price(USD):	255.0
Delivery:	via email in 1 business day

High purity carbon dioxide 1 Scope This document specifies the requirements for technical indicators, inspection rules, sampling, marking, packaging, storage, transportation, filling and safety warning of high purity carbon dioxide, and describes the test methods of high purity carbon dioxide. This document is applicable to the carbon dioxide with a purity greater than or equal to 99.99% (mole fraction), which is prepared by purifying industrial carbon dioxide, industrial tail gas and food additive liquid carbon dioxide. 2 Normative references The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 150 (All parts) Pressure vessels GB 190 Packing symbol of dangerous goods GB/T 3723 Sampling of chemical products for industrial use - Safety in sampling GB/T 5099.1 Seamless steel gas cylinders - Part 1: Quenched and tempered steel cylinders with tensile strength less than 1100MPa GB/T 5099.3 Seamless steel gas cylinders - Part 3: Normalized cylinders GB/T 5099.4 Seamless steel gas cylinders - Part 4: Seamless stainless steel gas cylinders GB/T 5832.1 Gas analysis - Determination of moisture - Part 1: Electrolytic method GB/T 5832.2 Gas analysis - Determination of moisture - Part 2: Dew point method GB/T 5832.3 Determination of moisture in gases - Part 3: The method of cavity ring-down spectroscopy GB/T 6285 Determination of trace oxygen in gases - Electrochemical method GB/T 6681 General rules for sampling solid chemical products GB/T 7144 Coloured cylinder mark for gases GB/T 8984 Determination of carbon monoxide, carbon dioxide and hydrocarbon in gases - Gas chromatographic method GB/T 11640 Seamless aluminum alloy gas cylinders GB/T 14193 Rules for filling of liquefied gas cylinders GB 15258 General rules for preparation of precautionary label for industrial chemicals GB/T 16804 Precautionary labels for gas cylinders GB/T 24159 Welded insulated cylinders GB/T 28726 Gas analysis - Gas chromatograph with helium ionization detector GB/T 30685 Technical requirements for vertical road transportation of cylinder GB/T 34525 Safety rules for handling, loading and unloading, storing and using of cylinder GB/T 35528 Safety guidelines for cryogenic liquefied gases JB/T 6898 Cryogenic liquid storage and transportation equipment - Safety regulation for operation NB/T 47058 Road tankers for refrigerated liquefied gas TSG R0005 Supervision regulation on safety technology for transportable pressure vessel TSG 23 Regulation on safety technology for gas cylinder 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 direct sampling sampling with the sampling medium directly connected to the analyzer [Source: ISO 10715:1997, 2.1] 3.2 indirect sampling sampling with the sampling medium not directly connected to the analyzer [Source: ISO 10715:1997, 2.7] 4 Technical indicators The requirements of Table 1 shall be met. Table 1 Technical indicator requirements Item Indicator Carbon dioxide (CO2) purity (mole fraction)/10-2 ≥99.99 ≥99.995 ≥99.999 Hydrogen (H2) content (mole fraction)/10-6 <5 <2 <0.5 Oxygen (O2) content (mole fraction)/10-6 <10 <5 <1 Nitrogen (N2) content (mole fraction)/10-6 <60 <30 <3 Carbon monoxide (CO) content (mole fraction)/10-6 <5 <2 <0.5 Total hydrocarbon (THC) content (by methane, mole fraction)/10-6 <5 <3 <2 Moisture (H2O) content (mole fraction)/10-6 <15 <8 <3 Total sulfur content (by sulfur, mole fraction)/10-6 To be determined by the supplier and the purchaser through negotiation

Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Technical indicators 5 Inspection rules 6 Sampling 7 Test methods 8 Marking, packaging, storage, transportation, filling and safety warning Annex A (Normative) Sampling of high purity carbon dioxide Annex B (Informative) Chromatographic gas path flow for determination of total hydrocarbon content in high purity carbon dioxide Annex C (Informative) Safety warning Bibliography