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Monolithic membrane filtration structure

A filtration structure, monolithic technology, applied in the field of porous structure, separation of particles or molecules in production water, can solve the problems of increased number of seals, increased risk of passing through permeate, loss of total filtration volume of the filter, etc., to achieve the optimal size Effect

Active Publication Date: 2020-07-03
SAINT GOBAIN CENT DE RES & DEVS & DETUD EUROEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such a configuration brings with it a number of disadvantages: firstly, the device has the effect that the number of seals required increases and the risk of leakage or passage of the liquid to be filtered through the permeate increases
Furthermore, such solutions relying on the assembly of multiple small individual filter structures compared to monolithic filter structures of the same size (or overall volume), due to the space required between each of the units, Significant loss of total filter volume of the filter is produced
Additionally, the cost of an assembled filter or multi-filter element solution proves to be significantly higher than the cost of a monolithic filter

Method used

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Examples

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example 1

[0104] Example 1 (Invention)

[0105] The support is manufactured by forming a honeycomb of silicon carbide according to a technique well known to those skilled in the art. To this end, the following are blended in a mixer:

[0106] -3000 g of a mixture of two silicon carbide particles with a purity higher than 98%, containing 75% by mass of the first particle powder with a median diameter of about 60 μm and 25% by mass of the median diameter of about 2.0 μm second particle powder; and

[0107] -300 g of organic binder of cellulose derivative type.

[0108] With respect to the mass of SiC and organic binder, approximately 25% by mass of water is added, and the mixture is mixed to form a uniform paste whose plasticity allows extrusion, so as to obtain a support exhibiting a porosity of 40%.

[0109] A mold was used to extrude the support from this paste, so as to obtain a cylindrical crude monolithic block with a diameter of 51 mm and a length of 300 mm, the inner part of which had a p...

example 2

[0126] In order to obtain the permeability K s Another value of is different from that in Example 1. For this second series of examples, the support is made from a blend of two silicon carbide particle powders with a purity higher than 98%, containing 70% of the median diameter by mass It is about 11 μm of the first particle powder and 30% by mass of the second particle powder with a median diameter of about 0.5 μm.

[0127] Then, the obtained crude support is dried so that the content of water that is not chemically bound drops to less than 1% by mass, and then it is fired to a temperature of 2150°C under argon to maintain This temperature lasted 5 hours. The obtained support has an open porosity of 40% and a median diameter of pores of about 15 microns, as measured by mercury porosimetry.

[0128] A support was thus obtained, the permeability of which was lower than the permeability measured in the first series of examples as reported in Table 2. Then, the same procedure as use...

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Abstract

A monolithic membrane filtration structure for filtering liquids, comprising a support formed from a porous inorganic material of permeability Ks, said support having a generally tubular shape havinga main axis, an upstream base, a downstream base, a peripheral wall delimiting an inner portion and a plurality of channels parallel to the main axis of the support, formed in the inner portion of thesupport, a membrane of permeability Km and average thickness tm covering the inner surface of the channels, the outer hydraulic diameter of said structure satisfying the relationship: Of= alpha *[A +B * log10 (Ks * tm / Km)] (1) in which alpha is a coefficient of between 0.85 and 1.15 and formula (A); B = -11760 * D h * e int + 9.7 * e int + 3.1 * e ext + 0.04517 where: D h is the average hydraulic diameter of the channels e int is the minimum thickness of the inner walls between the channels e ext is the minimum thickness of the peripheral wall of the filter, tm, Of, eint, eext and Dh are expressed in metres and Ks and Km are expressed in m2.

Description

Technical field [0001] The present invention relates to the field of filtration structures made of inorganic materials and intended to filter liquids, in particular porous structures coated with a membrane in order to separate particles or molecules from liquids, more particularly from water, especially Separate particles or molecules from production water derived from the extraction of oil and natural gas from shale. It has also found its application in various industrial processes for the purification and / or separation of liquids in the chemical, pharmaceutical, food or agri-food industries. Background technique [0002] Filters that use ceramic or non-ceramic membranes to filter various fluids, especially contaminated water, have long been known. [0003] These filters are generally manufactured from a tubular support made of porous inorganic material, the tubular support being formed by a wall defining a longitudinal channel parallel to the axis of the support. The inner surf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D63/06B01D71/02
CPCB01D63/066B01D71/0215B01D2221/04B01D2221/06B01D2221/10
Inventor S.平森P.勒普莱M.默勒R.诺伊费尔特M.法贝尔
Owner SAINT GOBAIN CENT DE RES & DEVS & DETUD EUROEN