Posted By: jiuwumembrane
Date: Tue, 5 Sep 2023
The organic membrane is a material having a selective separation function, and when there is a driving force on both sides of the membrane (such as a pressure difference, a concentration difference, a potential difference, etc.), the raw material component selectively permeates the membrane. Separation, classification, concentration and purification of different liquid or gas components can be achieved by selective separation of membranes. Since no morphological changes are required, membrane separation techniques are particularly suitable for separation processes without phase change and chemical change. Widely used in medicine, biology, food, petrochemical, energy, water treatment and other fields, resulting in huge economic and social benefits.
Membrane materials are the basis and core of membrane technology. The properties and chemical structure of membrane materials play a decisive role in membrane separation performance. There are many types of membranes according to different classification methods.
a. The pore size of the membrane
According to the size of the hi tech membrane pore size or the size of the retained particles, it can be divided into Microfiltration (MF), Ultrafiltration (UF), Nanofiltration (NF) and Reverse Osmotic (RO).
b. The material of the membrane
The material of the membrane determines the chemical properties of the membrane, which determines the main chemical properties such as hydrophilicity, anti-contamination, acid and alkali resistance, grease resistance, organic solvent resistance, high-temperature resistance and sunlight resistance.
It is stronger the hydrophilicity of the membrane, the higher the anti-contamination property; It is better the chemical stability of the membrane, the stronger the acid and alkali resistance and the stronger the oxidation resistance, the better the durability of the membrane.
Depending on the material of the membrane, the membrane can be divided into an inorganic membrane and an organic membrane.The organic membrane is made of high molecular materials are processed and compounded, such as polyvinylidene fluoride, polyvinyl chloride, polyethersulfone, polysulfone, polypropylene, polyethylene, polyacrylonitrile, aromatic polyamide, cellulose acetate, and the like. The organic membrane has a wide range of selectivity, and can be selectively made into various membranes according to different uses, different properties, and different molecular cutting amounts, but when the raw materials have strong acid, alkali, strong corrosive, high temperature and high concentration organic pollution characteristics. At the time, the organic membrane is prone to corrosion and clogging of the membrane pores. The main features of the organic and inorganic membranes are compared as shown in the following table:
c. The configuration of the membrane
The configuration of the membrane is related to its manufacturing process, and is generally classified into a hollow fiber membrane, a flat membrane, a tubular membrane, and a spiral membrane.
If you want to know more kinds of organic membrane filters, please visit our website.
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I am actually looking for male survey respondent age range 18-29 singaporean or pr. However, i am looking at indian, eurasian and foreigners who have turned pr to help me to complete this survey by saturday. There will be a small token of appreciation given by one of the ministries. Please telegram me at akimoto_emi if you fit into this criteria
Posted in Surveys
The most memorable hotel experience in my lifetime was at the Rayavadee in Thailand. Back then it was owned by Sheraton, and I had a couple of free night vouchers and Rayavadee seemed like the best place to use them. Our ‘room’ was a two story bungalow, right on Railay Beach which is ‘other worldly’ kind of awesome. The resort is so massive, you have to call a free buggy to take you around. Just steps outside the resort we could get cheap Thai food. I barely spent any money there, and because our toilet had a problem, they gave us free dinner vouchers.
Posted in Travel & Holidays
Hi, I'm after a little advice – I'm trying to get an idea of the processing timeline for recruiting a candidate, who would work remotely from Singapore via a payroll company.
Here's some info on the candidate in question:
- Indian passport holder
- Currently works for a company in Singapore under an EP
- Earnings will exceed SGP10k per month
- Will work 4 days per week under permanent contract
- Educated at university level
The payroll company, which handles the permit/visa application, has advised me of a VERY LONG processing timeline: likely 3 months to get through the waitlist and a further 1-2 to onboard the employee. So that's around 5 months in total! :shock:
Does the above sound accurate? Many thanks in advance!
EandO in Penang (best high tea ever) and Hotel Puri in Malacca (like staying in a mini museum). Haven't been to either in a long time, alas.
I'm not a huge fan of Penang, but I would stay at the EandO if I go again. Not sure when you were last there; the newer wing (not exactly new any longer though), Victory Annex, has some higher floors with balconies and nice views over the water. Rooms are also big at 50+ sq meters. However, at this point the original wing may be in better condition (renovated in 2019).
Posted in Travel & Holidays
Posted in Travel & Holidays