OSMO Membrane Systems GmbH is excellently grounded in high pressure reverse osmosis systems with a working pressure up to 160 bars (2300 PSI).
So, very high salt contents can be reached.
Thus, especially for downstream evaporators, the evaporation volume flow can be reduced significantly which means enormous reductions in plant capacity and energy consumption.
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During the production process of basic organic chemicals, very often condensates occur as byproducts, which have to be treated before dumping or recycling into production process. The condensate occurring at the product process of caprolactame contents for example ammonium sulfate and caprolactame. The loss of these products instead of recycling would not only mean a reduction of the process recovery, but also very high costs for waste water treatment. These condensates can be concentrated by a reverse osmosis plant. Because of the high salt retention rate of the reverse osmosis membrane, nearly all contents of the condensate are separated and can be brought back to the production cycle. The filtered permeate can be dumped into the municipal waste water system without hesitation.
In some cases, the recirculation of the separated contents is not appropriated. In this context, reverse osmosis helps reducing the volume of the accruing condensate. The remaining condensate after concentration will be incinerated because of its high dirt load whereby the residual amount of condensate is very often less than 10% of the initial amount.
Membrane filtration plants of OSMO Membrane Systems GmbH offer various solutions for desalination. Hereby, we offer all stages of projecting – from proof of concept to costumized plant – from a single source.
In times of increasing energy and raw material costs, desalination can be a remarkable contribution in the process chain, to cut running costs and to conserve resources.
At the production of dyes, e.g. azo dyes, optical brightening agents (OBA) and so on, nano filtration plants are used for retention of pigments and elution of the present neutral salts (Na+Cl-). At the first production step, the content of sodium chloride will be reduced by dia filtration and addition of deionized water until the required salinity of permeate is reached. The proper selection of the NF membrane achieves the highest possible dye retention at the remaining NF concentrate. After this step, dye can be concentrated to the required values. So, different steps of production can be realized by only one nano filtration plant. Depending on the type of dye and the required retention rate, different NF membranes are suitable.
Other organic solutions can be desalinated in an analogous way with nanofiltration.
In many applications of the chemical industries, a concentration by evaporation of mixtures and brines is necessary.
Without membrane technologies, the whole volume flow of the process has to be evaporated. With an upstream reverse osmosis plant, the liquid flow can be pre-concentrated and condensed by a factor of 50-75%. The remaining volume flow is treated by a conventional evaporator. The energy consumption of the membrane systems is mostly significantly below of the consumption of the thermal processes, what makes a condensation by membrane plants very economical.
Similar product: High pressure reverse osmosis
With electro deionisation, permeate of reverse osmosis or other process waters can be completely demineralised. According to the VGB recommendations, a max. conductivity of 0,08 µS/cm is allowed for fully demineralised water.