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Similar standardsHG/T 6093-2022: Bipolar membrane---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/HGT6093-2022HG CHEMICAL INDUSTRY STANDARD ICS 71.100 CCS J 77 Bipolar Membrane Issued on. SEPTEMBER 30, 2022 Implemented on. APRIL 1, 2023 Issued by. Ministry of Industry and Information Technology of the People’s Republic of China. Table of ContentsForeword... 3 1 Scope... 4 2 Normative References... 4 3 Terms and Definitions... 4 4 Requirements... 6 5 Test Methods... 7 6 Inspection Rules... 20 7 Marking, Packaging, Transportation and Storage... 21 Appendix A (Informative) Schematic Diagram of Testing Device... 241 ScopeThis Document specifies the requirements, test methods, inspection rules, marking, packaging, transportation and storage of bipolar membranes. This Document applies to the research and development, production, inspection and use of bipolar membrane products.2 Normative ReferencesThe provisions in following documents become the essential provisions of this Document through reference in this Document. For the dated documents, only the versions with the dates indicated are applicable to this Document; for the undated documents, only the latest version (including all the amendments) is applicable to this Document. GB/T 191 Packaging – Pictorial marking for handling of goods GB/T 601-2016 Chemical Reagent - Preparations of Standard Volumetric Solutions GB/T 4456 Polyethylene blown film for packaging applications GB/T 6543 Single and double corrugated boxes for transport packages GB/T 6682-2008 Water for analytical laboratory use - Specification and test methods GB/T 9174 General specification for transport packages of general cargo GB/T 9969 General Principles for Preparation of Instructions for Use of Industrial Products3 Terms and DefinitionsFor the purposes of this Document, the terms and definitions given in GB/T 20103-2006 and HY/T 166.1-2013 and the following apply. 3.1 Bipolar membrane A membrane with a multi-layer functional structure composed of anion and cation exchange layers and a transition layer with water dissociation catalysis in the middle. [Source. GB/T 20103-2006, 3.l.7, modified] 3.4 Dimensional changes The extent to which the geometric dimensions of a membrane change when it is transferred from one solution to another. 3.5 Area resistance The resistance value of a film specimen of a certain area. 3.6 Trans-membrane voltage in a given solution, the trans-membrane flow of a certain amount of charged ions results in a potential difference on both sides of the membrane. 3.7 Tolerance of chemical reagent After soaking in a specific concentration of chemical reagent for a certain period of time. The extent of membrane damage.4 Requirements4.1 Appearance The appearance of the bipolar membrane shall be smooth and clean, without mechanical damage or pinholes, no wrinkles, no oil, or no debris. 4.4 Bursting strength The bursting strength of the bipolar membrane shall be no less than 0.25 MPa. 4.5 Dimensional changes The change rate of the length, width and thickness of the bipolar membrane when transferred from pure water to 2 mol/L hydrochloric acid solution shall be no greater than 8%. 4.6 Area resistance The area resistance of the bipolar membrane shall be no greater than 10 Ω·cm2. 4.7 Trans-membrane voltage The trans-membrane voltage of the bipolar membrane at a current density of 100 mA/cm2 shall be no greater than 1.5V. 4.9 Generation rate of acid or base At a current density of 40 mA/cm2, the generation rate of acid or base of the bipolar membrane shall be no less than 0.15 mol/ (m2 • min).5 Test Methods5.1 Appearance The visual inspection and inspection results shall meet the requirements of 4.1. 5.3 Ion exchange capacity 5.3.1 Test conditions The test shall be carried out in a constant temperature room at 25°C ± 1°C. 5.3.2 Test principle The dissociable ions attracted to the fixed groups in the membrane can equivalently exchange with counter ions in the solution. The exchange capacity of the membrane is determined by titrating the dissociable ions exchanged with the counter ions in the solution. 5.3.4 Chemical reagents Sodium hydroxide, hydrochloric acid, silver nitrate, sodium sulfate, potassium hydrogen phthalate, sodium chloride, phenol hydroxide, potassium chromate, pure water. Among them, sodium chloride and potassium hydrogen phthalate are the primary reagents, and the rest are of analytically pure. The used standard solution is prepared in accordance with the provisions of GB/T 601-2016; and the pure water shall comply with the secondary water standard specified in GB/T 6682-2008. 5.3.5 Test procedures 5.3.5.3 Determination of moisture content The determination of moisture content shall be carried out according to the test method specified in 6.3 of HY/T 166.1-2013. 5.3.5.4 Determination of ion exchange capacity of cation exchange layer The procedures for measuring the ion exchange capacity of the cation exchange layer are as follows. 5.3.5.5 Determination of ion exchange capacity of anion exchange layer The procedures for measuring the ion exchange capacity of the anion exchange layer are as follows. 5.4 Bursting strength The determination of the bursting strength of the bipolar membrane shall be carried out in accordance with the test method specified in 6.6 of HY/T 166.1-2013. 5.5 Dimensional changes 5.5.1 Test conditions The test shall be carried out in a constant temperature room at 25°C±1°C. 5.8 Tolerance of chemical reagent 5.8.1 Test conditions The test is carried out in a constant temperature room at 25°C ± 1°C. 5.8.4 Test procedures 5.8.4.1 Acid tolerance of chemical reagent The test procedures for acid tolerance of chemical reagents are as follows. 5.9 Generation rate of acid and base 5.9.1 Test conditions The test shall be carried out in the constant temperature room at 25°C±1°C. 5.9.2 Test principle Place the bipolar membrane in an electrodialysis membrane stack containing electrode plates; introduce the sodium sulfate solution. Apply a DC electric field on both sides of the bipolar membrane; measure the amount of acid and base produced in the acid-base chamber under fixed current density conditions, and calculate the generation rate of acid or base. 5.9.3 Apparatus The apparatus required for the test is as follows. 5.9.4 Chemical reagents Sodium sulfate solution [c(Na2SO4) = 0.5 mol/L]. 5.9.5 Test procedures The test procedures for the generation rate of acid or base of the bipolar membrane are as follows. 5.9.6 Data processing Calculate the generation rate of acid according to the Formula (12). Calculate the generation rate of base according to the Formula (13).6 Inspection Rules6.1 Inspection classification The inspection of bipolar membranes is divided into exit-factory inspection and type inspection. 6.2 Batching rules Products of the same model and produced on the same day are considered to be one batch. 6.3 Exit-factory inspection 6.3.2 Determination rules If all inspection items meet the requirements of this Document, the batch of products will be deemed qualified. 6.4 Type inspection 6.4.1 Type inspection conditions Type inspection shall be carried out under one of the following circumstances. 6.4.3 Judgment rules If all inspection items meet the requirements of this Document, the batch of products will be judged to be qualified.7 Marking, Packaging, Transportation and Storage7.1 Marking The exit-factory mark of the bipolar membrane shall include the following items. 7.2 Packaging 7.2.1 Inner packaging The inner packaging of the bipolar membrane uses high-density polyethylene blown membrane, which shall comply with the provisions of GB/T 4456. 7.2.2 Outer packaging The outer packaging of bipolar membrane contains the following contents. 7.2.3 Packaging box The packaging box of the bipolar membrane contains the following contents· 7.3 Transportation During the transportation, loading and unloading process of bipolar membranes, they shall not be subject to severe impact, bumping, throwing, squeezing, rain and stains; and shall also avoid contact with corrosive chemical reagents. HG/T 6093-2022 HG CHEMICAL INDUSTRY STANDARD ICS 71.100 CCS J 77 Bipolar Membrane Issued on. SEPTEMBER 30, 2022 Implemented on. APRIL 1, 2023 Issued by. Ministry of Industry and Information Technology of the People’s Republic of China.Table of ContentsForeword... 3 1 Scope... 4 2 Normative References... 4 3 Terms and Definitions... 4 4 Requirements... 6 5 Test Methods... 7 6 Inspection Rules... 20 7 Marking, Packaging, Transportation and Storage... 21 Appendix A (Informative) Schematic Diagram of Testing Device... 241 ScopeThis Document specifies the requirements, test methods, inspection rules, marking, packaging, transportation and storage of bipolar membranes. This Document applies to the research and development, production, inspection and use of bipolar membrane products.2 Normative ReferencesThe provisions in following documents become the essential provisions of this Document through reference in this Document. For the dated documents, only the versions with the dates indicated are applicable to this Document; for the undated documents, only the latest version (including all the amendments) is applicable to this Document. GB/T 191 Packaging – Pictorial marking for handling of goods GB/T 601-2016 Chemical Reagent - Preparations of Standard Volumetric Solutions GB/T 4456 Polyethylene blown film for packaging applications GB/T 6543 Single and double corrugated boxes for transport packages GB/T 6682-2008 Water for analytical laboratory use - Specification and test methods GB/T 9174 General specification for transport packages of general cargo GB/T 9969 General Principles for Preparation of Instructions for Use of Industrial Products3 Terms and DefinitionsFor the purposes of this Document, the terms and definitions given in GB/T 20103-2006 and HY/T 166.1-2013 and the following apply. 3.1 Bipolar membrane A membrane with a multi-layer functional structure composed of anion and cation exchange layers and a transition layer with water dissociation catalysis in the middle. [Source. GB/T 20103-2006, 3.l.7, modified] 3.4 Dimensional changes The extent to which the geometric dimensions of a membrane change when it is transferred from one solution to another. 3.5 Area resistance The resistance value of a film specimen of a certain area. 3.6 Trans-membrane voltage in a given solution, the trans-membrane flow of a certain amount of charged ions results in a potential difference on both sides of the membrane. 3.7 Tolerance of chemical reagent After soaking in a specific concentration of chemical reagent for a certain period of time. The extent of membrane damage.4 Requirements4.1 Appearance The appearance of the bipolar membrane shall be smooth and clean, without mechanical damage or pinholes, no wrinkles, no oil, or no debris. 4.4 Bursting strength The bursting strength of the bipolar membrane shall be no less than 0.25 MPa. 4.5 Dimensional changes The change rate of the length, width and thickness of the bipolar membrane when transferred from pure water to 2 mol/L hydrochloric acid solution shall be no greater than 8%. 4.6 Area resistance The area resistance of the bipolar membrane shall be no greater than 10 Ω·cm2. 4.7 Trans-membrane voltage The trans-membrane voltage of the bipolar membrane at a current density of 100 mA/cm2 shall be no greater than 1.5V. 4.9 Generation rate of acid or base At a current density of 40 mA/cm2, the generation rate of acid or base of the bipolar membrane shall be no less than 0.15 mol/ (m2 • min).5 Test Methods5.1 Appearance The visual inspection and inspection results shall meet the requirements of 4.1. 5.3 Ion exchange capacity 5.3.1 Test conditions The test shall be carried out in a constant temperature room at 25°C ± 1°C. 5.3.2 Test principle The dissociable ions attracted to the fixed groups in the membrane can equivalently exchange with counter ions in the solution. The exchange capacity of the membrane is determined by titrating the dissociable ions exchanged with the counter ions in the solution. 5.3.4 Chemical reagents Sodium hydroxide, hydrochloric acid, silver nitrate, sodium sulfate, potassium hydrogen phthalate, sodium chloride, phenol hydroxide, potassium chromate, pure water. Among them, sodium chloride and potassium hydrogen phthalate are the primary reagents, and the rest are of analytically pure. The used standard solution is prepared in accordance with the provisions of GB/T 601-2016; and the pure water shall comply with the secondary water standard specified in GB/T 6682-2008. 5.3.5 Test procedures 5.3.5.3 Determination of moisture content The determination of moisture content shall be carried out according to the test method specified in 6.3 of HY/T 166.1-2013. 5.3.5.4 Determination of ion exchange capacity of cation exchange layer The procedures for measuring the ion exchange capacity of the cation exchange layer are as follows. 5.3.5.5 Determination of ion exchange capacity of anion exchange layer The procedures for measuring the ion exchange capacity of the anion exchange layer are as follows. 5.4 Bursting strength The determination of the bursting strength of the bipolar membrane shall be carried out in accordance with the test method specified in 6.6 of HY/T 166.1-2013. 5.5 Dimensional changes 5.5.1 Test conditions The test shall be carried out in a constant temperature room at 25°C±1°C. 5.8 Tolerance of chemical reagent 5.8.1 Test conditions The test is carried out in a constant temperature room at 25°C ± 1°C. 5.8.4 Test procedures 5.8.4.1 Acid tolerance of chemical reagent The test procedures for acid tolerance of chemical reagents are as follows. 5.9 Generation rate of acid and base 5.9.1 Test conditions The test shall be carried out in the constant temperature room at 25°C±1°C. 5.9.2 Test principle Place the bipolar membrane in an electrodialysis membrane stack containing electrode plates; introduce the sodium sulfate solution. Apply a DC electric field on both sides of the bipolar membrane; measure the amount of acid and base produced in the acid-base chamber under fixed current density conditions, and calculate the generation rate of acid or base. 5.9.3 Apparatus The apparatus required for the test is as follows. 5.9.4 Chemical reagents Sodium sulfate solution [c(Na2SO4) = 0.5 mol/L]. 5.9.5 Test procedures The test procedures for the generation rate of acid or base of the bipolar membrane are as follows. 5.9.6 Data processing Calculate the generation rate of acid according to the Formula (12). Calculate the generation rate of base according to the Formula (13).6 Inspection Rules6.1 Inspection classification The inspection of bipolar membranes is divided into exit-factory inspection and type inspection. 6.2 Batching rules Products of the same model and produced on the same day are considered to be one batch. 6.3 Exit-factory inspection 6.3.2 Determination rules If all inspection items meet the requirements of this Document, the batch of products will be deemed qualified. 6.4 Type inspection 6.4.1 Type inspection conditions Type inspection shall be carried out under one of the following circumstances. 6.4.3 Judgment rules If all inspection items meet the requirements of this Document, the batch of products will be judged to be qualified.7 Marking, Packaging, Transportation and Storage7.1 Marking The exit-factory mark of the bipolar membrane shall include the following items. 7.2 Packaging 7.2.1 Inner packaging The inner packaging of the bipolar membrane uses high-density polyethylene blown membrane, which shall comply with the provisions of GB/T 4456. 7.2.2 Outer packaging The outer packaging of bipolar membrane contains the following contents. 7.2.3 Packaging box The packaging box of the bipolar membrane contains the following contents· 7.3 Transportation During the transportation, loading and unloading process of bipolar membranes, they shall not be subject to severe impact, bumping, throwing, squeezing, rain and stains; and shall also avoid contact with corrosive chemical reagents. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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