At present, reverse osmosis water treatment equipment is mainly divided into single-stage reverse osmosis and two-stage reverse osmosis equipment.

Mainly different from the above process. Single stage reverse osmosis equipment is a product water process in which the raw water is directly pumped into the reverse osmosis device through a high-pressure pump after being treated by a pre-treatment system and a precision filter.

Two stage reverse osmosis equipment, also known as two-stage reverse osmosis. The raw water is pressurized and enters the pre-treatment system for coarse filtration, and then enters the precision filter for filtration. Afterwards, the first stage high-pressure pump pressurizes the first stage reverse osmosis system. The water generated by the system is pressurized by the secondary high-pressure pump to the secondary reverse osmosis system. The process of producing product water is called two-stage reverse osmosis.

Single stage reverse osmosis refers to water treatment equipment that only has one stage of filtration, that is, only one stage of reverse osmosis membrane filtration. Double stage reverse osmosis refers to the process flow of a fully automatic double stage reverse osmosis water treatment equipment that is directly proportional to the price and quality after being filtered through a first stage reverse osmosis membrane. Quality at lower prices cannot be guaranteed. It mainly depends on the configuration of electrical components. Membranes, accessories, and electrical grade reverse osmosis equipment are equivalent to the principle of secondary filtration, so the price will be higher than that of single-stage reverse osmosis.

So, what is the difference between single-stage reverse osmosis and two-stage reverse osmosis?

From the perspective of gas field water conductivity, after single stage reverse osmosis treatment, the water quality conductivity is generally between 10-20 μ Below s/cm; After dual stage reverse osmosis treatment, the water conductivity can be lower than 5 μ S/cm or even lower.

The desalination rate of single-stage reverse osmosis equipment is different from that of two-stage reverse osmosis equipment. The desalination rate of the two-stage reverse osmosis device is higher than that of the single-stage reverse osmosis device.

The difference of the system is that single-stage reverse osmosis equipment is a device that removes some substances from water through membrane separation technology. Two stage reverse osmosis equipment refers to the filtration of raw water through two reverse osmosis membranes, in order to achieve a high desalination rate standard.

In general industries or other industries that do not have high water quality requirements, single-stage reverse osmosis equipment will be used. If there are strict requirements for water quality, two-stage reverse osmosis equipment will be used.

The two-stage reverse osmosis equipment includes a two-stage reverse osmosis device, a cleaning system, and an intermediate water tank. The two-stage reverse osmosis process can remove ions from water and ensure that the effluent meets the inlet requirements of subsequent EDI equipment. Ultra pure water can be prepared to achieve a resistivity of 18M Ω/cm.

So, returning to the question in the title, why is it said that producing urea for vehicles requires the use of dual stage reverse osmosis water treatment equipment?

Automotive urea refers to a urea aqueous solution with a urea concentration of 32.5% and a solvent of ultrapure water. The raw materials are automotive urea raw materials and ultrapure water. That is to say, to produce automotive urea that meets national standards, ultra pure water needs to be used. According to the previous text, ultrapure water can only be produced using dual stage reverse osmosis equipped with EDI equipment, with a resistivity of 18M Ω/cm, thereby producing qualified automotive urea. So you should understand now.

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