HG/T 6093-2022 English PDF (HGT6093-2022)

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HG/T 6093-2022: Bipolar membrane
HG/T 6093-2022
HG
CHEMICAL INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 71.100
CCS J 77
Bipolar Membrane
双极膜
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 Contents
Foreword ... 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 ... 24
Bipolar Membrane
1 Scope
This 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 References
The 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
Products
GB/T 14436 General Principles of Industrial Product Guarantee Documents
GB/T 20103-2006 Technical terms for membrane separation
HG/T 5112-2016 Diffusion dialysis anion exchange membrane
HY/T 166.1-2013 Ion-exchange membrane - Part 1: Electro-driven membrane
3 Terms and Definitions
For 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]
3.2 Ion exchange capacity
The amount of ions in an ion exchange membrane that are in charge balance with the fixed
groups.
NOTE: The unit of ion exchange capacity is: mol/kg (dry membrane).
[Source: GB/T 20103-2006, 3.1.13]
3.3 Bursting strength
Apply fluid pressure perpendicular to the membrane surface on the membrane, the critical
pressure at which the membrane begins to leak or rupture.
NOTE: The unit of bursting strength is MPa.
[SOURCE: GB/T 20103-2006, 3.1.21]
3.4 Dimensional changes
The extent to which the geometric dimensions of a membrane change when it is transferred
from one solution to another.
NOTE: The dimensional change rate is expressed as the percentage change of length, width or thickness.
3.5 Area resistance
The resistance value of a film specimen of a certain area.
Note: The unit of area resistance is: Ω · cm2.
[SOURCE: GB/T 20103-2006, 3.1.19]
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.
NOTE: The unit of trans-membrane voltage is: V.
The trans-membrane voltage of the bipolar membrane at a current density of 100 mA/cm2 shall
be no greater than 1.5V.
4.8 Tolerance of chemical reagent
If the bipolar membrane is soaked in 6 mol/L hydrochloric acid solution for 2000 h, the decrease
rate of bursting strength shall be no greater than 10%. If the bipolar membrane is soaked in 6
mol/L sodium hydroxide solution for 2000 h, the decrease rate of bursting strength shall be no
greater than 10%.
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 Methods
5.1 Appearance
The visual inspection and inspection results shall meet the requirements of 4.1.
5.2 Thickness deviation
The inspection of thickness deviation shall be carried out according to the test methods
specified in 6.2 of HG/T 5112-2016.
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.
5.3.3 Apparatus
The apparatus for the test is as follows:
a) Base burette: 25.0 mL:
b) Brown acid burette; 25.0 mL;
c) Volumetric flask: 100 mL;
d) Triangular flask with stopper: 250 mL;
e) Analytical balance: 100 g, accuracy of 0.001 g:
f) Dryer;
g) Oven: 300°C. Temperature control accuracy 1°C.
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
5.3.5.1 Preparation of membrane sample
Randomly select a membrane from the membranes to be tested; and randomly select a square
membrane with a side length of 10 cm from the upper, middle, and lower parts of the membrane
as a membrane sample.
5.3.5.2 Pretreatment of membrane sample
The pretreatment procedures for membrane samples are as follows:
a) Take the membrane sample prepared in 5.3.5.1, soak it in pure water for no less than 24
h, and take it out;
b) Soak the membrane sample in 1 L of sodium hydroxide solution [c (NaOH) = 1.0 mol/L]
for 2.5 h ± 0.5 h. Take it out; wash it with pure water until neutral; and then transfer it to
1 L hydrochloric acid solution [c(HCI) = 1.0 mol/L]; soak for 2.5 h±0.5 h. Take it out;
and wash with pure water until neutral;
c) Repeat the Procedure b) for twice;
d) Transfer to hydrochloric acid solution [c(HCl) = 1.0 mol/L], the soaking time shall be no
less than 24 h;
e) Take out the membrane sample. Wash with pure water until neutral; use silver nitrate
solution to detect no chloride ions; place in pure water; and set aside.
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:
a) Take a membrane sample after pretreatment in 5.3.5.2; and use filter paper to absorb the
surface moisture. Quickly cut into square pieces with a side length of no more than 1 cm.
Weigh in a weighing bottle of known weight. Weigh the wet membrane of the membrane
sample (recorded as W...