Author: Site Editor Publish Time: 2023-04-10 Origin: Site
First of all, I would like to introduce what is TIPS technology.
Introduction to Thermally Induced Phase Separation
Thermally Induced Phase Separation (TIPS) is the abbreviation for Thermally Induced Phase Separation. It is a new method for the preparation of polymeric microporous membranes proposed and patented by A.J. Castro in 1981. The process and principle is to dissolve the polymer in a high boiling point, low volatile solvent (also known as a diluent) above the melting point of the polymer to form a homogeneous solution. It is then cooled down. During the cooling process, the system undergoes phase separation. This process is divided into two categories, solid-liquid phase separation (referred to as S-L phase separation) and liquid-liquid phase separation (L-L phase separation). Controlling the appropriate process conditions, after phase separation the system forms a two-phase structure with the polymer as the continuous phase and the solvent as the dispersed phase. At this point the solvent is then extracted by selecting the appropriate volatile reagent (i.e. extractant), resulting in a polymeric microporous membrane of a certain structural shape. TIPS has many advantages over the NIPS method: it promotes the separation of the polymer solution through a relatively rapid thermal exchange, rather than a slow solvent-non-solvent exchange; TIPS avoids the disadvantages of the NIPS method (non-solvent phase separation method) due to the presence of solvent-non-solvent exchange, resulting in a low porosity because part of the solvent in the film-forming solution is involved in the gelation of the polymer; TIPS can be used for The TIPS method can be used for the preparation of crystalline polymeric microporous membranes that are difficult to prepare by the NIPS method, and the TIPS method has fewer influencing factors than the NIPS method and is easier to control.
Steps in the preparation of membranes for thermotropic phase separation
The steps in the preparation of microporous membranes by the TIPS method are the preparation of the solution (either continuously or intermittently), the casting of the membrane and the post-treatment. These are: (1) the polymer is mixed with a high boiling point, low molecular weight liquid or solid diluent to form a homogeneous solution at high temperature; (2) the mixture is made into the desired shape (flat, hollow fibre or tubular); (3) the solution is cooled to allow phase separation; (4) the diluent is removed (commonly solvent extraction); and (5) the extractant is removed (evaporation) to obtain the microporous structure.
TIPS is shorted as Thermally Induced Phase Separation.
①The membrane silk flux is equivalent to that of Japanese brand A (> 2000LMH)
②After the production of components, the membrane flux is about 300LMH under standard conditions
(25℃, pure water 1Bar).
③High design flux, water reuse running flux 60-90lmh (much higher than the industry commonly used
40-50lmh), surface water (with mechanical filter pretreatment 90-100lmh, effectively reduce project
investment and operating costs;
④Compared with competing products, the same amount of water production, the number of
membrane is less, the use of the same amount of membrane, lower energy consumption. (Low
2.Super resistance, super long life
①At present, it is the only PVDF membrane produced by pure thermal method (TIPS) process in China
②Compared with other manufacturers, to overcome the PVDF material itself is not alkali resistant
shortcomings. (currently the only one in China)
Long-term cleaning can be done using 4%NaOH solution, 0.5%NaCLO, and 10% HCL H2SO4. (>2000H)
③Super cleaning recovery, after cleaning the hydrophilic energy of the film is basically unchanged, so
as to achieve a long service life (>15 years), 8 years warranty.
④Compared with competing products, the use of special polyurethane glue (without the use of epoxy
resin), lifetime will not produce peeling and film stripping phenomenon.
Evaluation from the overall service cycle - your most cost-
The use of JX high-throughput + long life membrane components, from the overall perspective of 15 years,
compared with the ordinary 3-5 years of life membrane components, to ensure the overall stable operation of
the equipment while significantly reducing investment and operating costs
The evaluation includes:
1. Initial investment cost: civil engineering + equipment + installation and commissioning
2. Equipment operation cost: electricity fee + medicine fee + operation and maintenance labor fee + wastewater
discharge and treatment fee
3. Membrane replacement cost: membrane body cost + replacement labor cost + old membrane treatment cost.
Nanjing Junxin Environmental Technology Co.,Ltd takes 5 years to study the TIPS UF membranes and now we can make some very good design and quality UF membranes Ultrafiltration membranes which is as the following :
JX NIPS Equivalent
Dupont SFP 2880 (77m2)
Suez ZW700B (60m2)
Dupont Inge XL (PES 50m2,60m2)
Toray HFU 2020N (72m2)
Pentair XF40C (40m2)
Hydranautics HYDRAcap MAX 40 (52m2)
Hydranautics HYDRAcap MAX 60 (80m2)
Hydranautics HYDRAcap MAX 80 (105m2)