ROIt's EnglishReverse Osmosis membraneThe abbreviation of it, and its Chinese meaning isReverse osmosis membrane. The general flow pattern of water is from low concentration to high concentration. Once water is pressurized, it will flow from high concentration to low concentration, which is what is calledReverse osmosis membranePrinciple: Due

ROThe pore size of reverse osmosis membranes is five millionths of a human hair.0.0001The micrometer is generally invisible to the naked eye, and viruses belong to it5000Therefore, only water molecules and some mineral ions beneficial to the human body can pass through, while other impurities and heavy metals are discharged through the wastewater pipe. All seawater desalination processes and the recycling and treatment of astronauts' wastewater are carried out using this method. Therefore

ROMembranes are also known as high-tech outside the body

"Artificial kidney"

ROReverse osmosis membrane

ROIntroduction to Reverse Osmosis Membranes--Advantages of reverse osmosis membranes

ROReverse osmosis membranes are semi-permeable membranes used in reverse osmosis to prepare pure water.

ROReverse osmosis membranes are generally made of high molecular materials. Such as cellulose acetate membrane, aromatic polyacylhydrazine membrane, aromatic polyamide membrane. The diameter of the surface micropores is generally within0.5～10nmThe degree of permeability is related to the chemical structure of the membrane itself. Some polymer materials have good salt repulsion, but their water permeation rate is not good. Some polymer materials have a chemical structure with more hydrophilic groups, so the permeation rate of water is relatively fast. Therefore, a satisfactory reverse osmosis membrane should have an appropriate permeation volume or desalination rate.

ROReverse osmosis membranes should have the following characteristics:

(1)It should have a desalination rate at high flow rates

(2)It has high mechanical strength and a long service life

(3)It can function under a relatively low operating pressure

(4)It can withstand the influence of chemical or biochemical actions

(5)bypHThe influence of factors such as value and temperature is relatively small

(6)The raw materials for film production are easy to obtain, simple to process and low in cost.

The structure of reverse osmosis membranes can be classified into two types: asymmetric membranes and composite membranes. The membrane materials currently in use are mainly cellulose triacetate and aromatic polyamides. Its components include hollow fiber type, wound type, plate and frame type and tube type. It can be used for chemical unit operations such as separation, concentration and purification, and is mainly applied in the pure water preparation and water treatment industries.

ROThe principle of reverse osmosis membranes

Reverse osmosis refers to the osmosis that occurs in a direction opposite to the natural osmosis direction of the solution, that is, the solvent permeates from a high-concentration solution to a low-concentration one. In living organisms, membranes serve as barriers between different tissues. When substances are exchanged, it only allows some of them to pass through and excludes the others. This kind of membrane that has a certain selective ability for substances is called a semi-permeable membrane. Suppose there is a membrane that only allows fresh water to pass through. Place it between fresh water and salt water. Under natural conditions, fresh water will pass through the semi-permeable membrane to dilute the salt water and reduce the concentration difference. When the height difference reaches a certain extent, the permeation will automatically stop(The pressure generated by this height difference is called "osmotic pressure".). If pressure is applied to the salt water side to be greater than the osmotic pressure, the water molecules in the salt water will be forced to seep into the fresh water side. This is the reverse osmosis phenomenon. As long as sufficient pressure is maintained and fresh water is removed in a timely manner, water molecules in the salt water continuously pass through the semi-permeable membrane into the fresh water, and the salt is "filtered" out. The so-called osmotic membrane is a liquid separation membrane that uses the reverse osmosis principle for separation. Specifically, there are many small holes on reverse osmosis membranes. The size of these holes only allows water molecules to pass through, while salt and impurity molecules are larger than the holes and thus cannot pass through

How much it looks like a sieve!

ROThe advantages of reverse osmosis membranes

The device features a compact structure, simple installation, easy operation, low energy consumption, and can be operated at normal temperature, making it convenient for industrial production. The key to film-making technology lies in choosing the best materials to make them suitable for large-scale industrial production. The size of the hole is also an important factor. It should be so small that viruses cannot pass through it to ensure the purity of the water.80The composite membrane invented in the past is composed of an ultra-thin reverse osmosis membrane, a porous support layer and fabric reinforcement self-superimposed. It has an extremely large water permeability and a high desalination rate99%It is an ideal reverse osmosis membrane. Reverse osmosis membranes are also particularly effective in separating small-molecule organic compounds, and thus have been well applied in fields such as organic chemical engineering, brewing industry, and three-waste treatment.

ROReverse osmosis membrane price

Beijing Yuanlai Water Treatment Equipment Co., LTD20Focusing on the water treatment industry for many years, we offer one-stop procurement of water treatment equipment, accessories and consumables.

We sell Dow reverse osmosis membranes, Hydranautics reverse osmosis membranes, Sehan membranes and Huitong membranes.

Specializing in the maintenance, installation, assembly, processing of water softening equipment, reverse osmosis pure water equipment and water treatment equipment services, we are a service provider.