Filter for highly viscous fluid

Details Filter for highly viscous fluid Filter for highly viscous fluid

1996-08-05

1998-07-14

Savage, Matthew O.

Liquid purification or separation

Plural distinct separators

Filters

210486, 210490, 210496, 210498, 210499, 210767, 26432817, B01D 2939

Patent

active

057798990

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The present invention relates to a filter for highly viscous fluid as well as a method for producing both a refined polymer by using said filter and moldings by molding said refined polymer.
1. Discussion of the Background
Hereinafter, a conventional filter assembly will be described by referring to FIGS. 4 and 5.
A filter 2 for removing different kinds of contaminated foreign matters and polymeric gel contaminated materials in a high molecule polymer 1 contains nonwoven fabric with different fiber diameters of metallic fine fibers 3 and 4 stacked and two protective wire mesh layers 5 for holding this nonwoven fabric of metallic fine fibers therebetween. The nonwoven fabric and protective wire mesh layers 5 are united in one piece by sintering. This mesh of layer 5 are of, e.g., 100 meshes.
In the filter assembly of FIG. 5, two filters 2 formed in the shape of disk are fixed to each other by sealing at the outer periphery. This one pair of filters 2 are determined to be a primary filter (for unfiltered solution) at the outer side and a secondary filter (for filtered solution) at the inner side.
The high-molecule polymer 1 filtered through this filter assembly is heated to an appropriate temperature, e.g., of 200.degree. C., thereby lowering the viscosity. For allowing the less viscous high-molecule polymer to pass through the above filters, a differential pressure of, e.g., 10 kg/cm.sup.2 is applied between the first side and the second side of the filter assembly.
To prevent the filters from a damage due to differential pressure 10 kg/cm.sup.2, a highly rigid ring-shaped supporting layer 6 is incorporated in such a manner as to be in contact with the second filter side of this filter assembly.
The supporting layer 6 comprises a wire mesh layer 7 made of a wire having a diameter of, e.g., 1 mm and two perforated plates 8, e.g., 0.8 mm thick, for holding this mesh layer 7 therebetween.
Between a combination of a pair of filters 2 and 2 with the supporting layer 6 and another, a ring-shaped spacer 9 is interposed. The spacer 9 comprises a wire mesh layer made of a wire having a diameter of, e.g., 1 mm.
A foreign matter deposited on each element in producing each element of a filter apparatus cannot always be cleaned in the cleaning step prior to the assembling.
Thus, after assembling the filter apparatus, cleaning each element is required by a prepurge with the filtered fluid. Because of being polluted with foreign matters, the fluid filtered during the prepurge is not available and wasted.
Though the foreign matters deposited at the primary side of a filter are removed by backwash, in the supporting wire mesh layer located at the second side of the filter, foreign matters, such as, e.g., wax component, are deposited during a long-time operation of the filtration device.
With a conventional filtration device as mentioned above, because of being internally mounted inside a pair of filters 2 and 2, the supporting layer 6 cannot be taken out and washed. And moreover the final layer of the filter cannot be directly cleaned because of being located inside the closed space.
It is one object of the present invention to provide a filter for highly viscous fluid permitting not only foreign matters in a supporting layer to be easily removed but also its final layer to be directly washed, a method for efficiently producing a refined polymer by using said filter and a method for producing moldings by molding said refined polymer.


SUMMARY OF THE INVENTION

According to the invention, the above object is achieved by a filter for highly viscous fluid comprising: a housing involving a cavity; a first rigid perforated member for partitioning a first chamber in the cavity, a second rigid perforated member for partitioning a second chamber in the cavity, a first filter jointed to the first perforated member at a section facing to the second chamber, a second filter joined to the second perforated member at a section facing to the first chamber, a supporting layer inserte

REFERENCES:
patent: 3294241 (1966-12-01), Sicard et al.
patent: 5449458 (1995-09-01), Gneuss

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