Liquid purification or separation – Casing divided by membrane into sections having inlet – Each section having inlet
Patent
1997-05-28
1999-07-20
Fortuna, Ana
Liquid purification or separation
Casing divided by membrane into sections having inlet
Each section having inlet
210231, 210232, 210450, 2104331, 210346, 21032163, B01D 6300
Patent
active
059252472
DESCRIPTION:
BRIEF SUMMARY
The disclosed invention refers to a carrier disk for guiding a flow, and a membrane cushion as a device for filtering and separating fluids by the use of reversed osmosis, nanofiltration, ultrafiltration or microfiltration membranes, wherein membrane cushions and carrier disks are arranged alternately such that the fluid to be treated flows on both sides across the membrane, the carrier disk sufficiently guides and swirls the fluid by means of its flow elements and leads it to the next disk level without substantial loss of pressure.
Carrier disks and membrane cushions form part of a device which, as a module, consists of the carrier disks, the membrane cushions, stack terminal plates, draw plates, packing sheets and/or terminal flanges and a cylindrical pressure tube. Within complete installations with a wide range of pumps, prefiltrations, purification devices and control units, these module elements are employed, singly or multiply, as filter installations for fluid media.
Module elements for the separation and filtration of fluids of similar nature are prior art and known by a wide range of patents. The described novel membrane elements are a new development of carrier disks and membrane cushions of a plate module. Plate modules have in common that they consist of flow, sealing or shut-off plates, sealings, flanges, draw plates and pressure bodies of very different kinds and dimensions.
A special problem is the fact that, in all plate modules, a relatively high loss of pressure takes place within the module. It is the goal of the development to reduce substantially this pressure, respectively the pressure gradient, across the module. This is especially important as a reduction in the loss of pressure in the module can reduce considerably the amount of electrical energy to be allocated and brings about considerable changes in circuitry possibilities (connections in series, transfer trees). Especially in applications in sewage or product recycling techniques, where it is important to limit the amount of concentrate, in general to the lowest possible volume, considerable advantages in investment and operational costs are the result. These advantages are even increased in the case of high-pressure techniques in membrane technology, which are especially energy-intensive.
In the areas of nanofiltration, ultrafiltration and microfiltration, in which the plate modules of prior art could not be employed because of high losses of pressure inherent to the modules, the present invention opens up a new field of application.
It has been achieved by the fundamentally novel circular flow guidance of the present invention, especially between the carrier disks and the membrane cushions, as well as by the selected flow guiding elements on the carrier disks, to reduce the losses of pressure compared to the usual modules by more than 50%, thus increasing the efficiency of the application as well as extending its operative range.
SUMMARY OF THE INVENTION
According to the invention, these problems are solved by the fact that shape and form of the carrier disk, especially the ramp-like flow guidance from one carrier disk to the next, lead to a circular flow over the membrane cushion. This is achieved by a generally radial slit-like passage guiding the flow from one carrier disk to the next like a ramp. That is how a typical problem of other plate module systems is avoided, namely a recurring sharp redirection of the flow by 180.degree., which is primarily responsible for the loss of pressure. In other plate module systems, the fluid medium is redirected by 180.degree. and guided to the next level at least once per plate module carrier disk.
The advantage of the carrier disk according to the invention generally consists in that the fluid flows over the area of both sides of the membrane cushion without resistance and is not guided from plate module carrier level to carrier level in a sharp or other 180.degree. flow redirection to the next membrane cushion, but is guided, at the end of a circuit by means of a ramp-like struc
REFERENCES:
patent: 4613436 (1986-09-01), Wight et al.
patent: 4639317 (1987-01-01), Luoma, II et al.
patent: 4892657 (1990-01-01), Mohn et al.
patent: 5232589 (1993-08-01), Kopf
patent: 5679249 (1997-10-01), Fendya et al.
Fortuna Ana
MFT Membran-Filtrations-Technik GmbH
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