Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Rod – strand – filament or fiber
Utility Patent
1999-10-22
2001-01-02
Edwards, Newton (Department: 1774)
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Rod, strand, filament or fiber
C428S375000, C428S393000, C008S120000, C008S194000, C008S196000
Utility Patent
active
06168863
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a fiber having a capability of forming a metal chelate, a process for producing the same, a method for sequestering metal ions with the same, and a filter to which a performance of removing impurities and metal ions in a fluid is imparted using the fiber as a filter material. This fiber can be widely utilized for purification of various fluids, for example, aqueous fluids including factory waste water, potable water, etc., non-aqueous fluids including edible oil and fat, etc. and gases including air, etc. because of its efficient performance of capturing a trace amount of metal ions contained in water, for example, harmful heavy metal ions including copper, zinc, nickel, cobalt, etc. even in a low pH range.
2. Description of the Prior Art
Various harmful metal ions are sometimes contained in industrial exhaust water and must be sufficiently removed by a waste water disposal in view of prevention of environmental pollution. There are many metal ions which can be utilized effectively as heavy metals and it serves double purposes to utilize them as a secondary resource after separation and recovery.
Heretofore, an ion exchange resin has widely been utilized to remove metal ions in exhaust water, but its effect of selectively adsorbing and capturing low concentration of metal ions is not sufficient necessarily. A chelate resin having a property of forming a chelate with heavy metal ions has also been utilized effectively to remove harmful heavy metals in the field of water treatment because of its particularly excellent selective capturing property to heavy metal ions.
However, almost all of these known chelate resins are beads-like or granular resins wherein iminodiacetic acid skeletons are introduced into a polycondensate having a rigid three-dimensional crosslinked structure, such as styrene-divinylbenzene resin, phenol-formaldehyde resin, etc. and a rate of diffusion and permeation of metal ions or regenerants into the resin is small and, therefore, a treatment efficiency is low. To enhance the rate of capturing or regeneration of metal ions by enhancing the rate of diffusion and permeation of the metal ions or regenerants, there has been proposed a method of reducing a particle diameter of the chelate resin thereby to enhance a surface area and to enhance a contact effective area with a fluid to be treated. However, since the particle diameter of the chelate resin must be reduced, not only handling becomes troublesome due to scatter of the chelate resin, but also a resistance to liquid passage of a layer filled with a chelate resin increases on water treatment and the treatment efficiency is lowered. In the case of disposal of the used chelate resin whose regenerating capability is lost, problems such as difficulty in incineration and complicated volume reduction had been pointed out for beads-like or granular chelate resin.
Under these circumstances, the present invention has been accomplished and an object of the present invention is to provide a novel fibrous chelate-forming material which has an excellent metal chelate-forming capability and can easily performing a regenerating treatment or disposal after use, and to establish a process for producing the fiber. Another object of the present invention is to provide a method for efficiently capturing metal ions contained in aqueous or non-aqueous liquids, or gases such as exhaust gas, etc. using the fiber. Still another object of the present invention is to provide a filter which can simultaneously remove insoluble impurities and metal ions contained in a fluid using the chelate-forming fiber as a filter material.
SUMMARY OF THE INVENTION
The present invention provides a technique which can efficiently adsorb and remove metalloid elements and compounds thereof from water and various exhaust gases, or which can efficiently uptake and recover them.
The metal chelate-forming fiber according to the present invention, which could have solved the above problems, refers to a metal chelate-forming fiber which has, in a fiber molecule, an acyl group represented by the following general formula [1] or [2]:
wherein X represents a residue in which one carboxyl group is eliminated from monocarboxylic acid or dicarboxylic acid;
V represents hydrogen or a carboxyl group;
Z represents hydrogen or has the same meaning as that of M, with the proviso that Z and M are the same or different;
M represents hydrogen; or
wherein R
1
represents a residue in which one hydrogen is eliminated from a carbon chain in an alkylene group, R
2
represents a direct bond or an alkylene group, Y
1
and Y
2
are the same or different and each represents hydrogen, a carboxyl group, an amino group, a hydroxy group or a thiol group, n is an integer of 1 to 4, M′ represents hydrogen or
wherein R
3
represents a residue in which one hydrogen is eliminated from a carbon chain in an alkylene group, R
4
represents a direct bond or an alkylene group, and Y
3
and Y
4
are the same or different and each represents hydrogen, a carboxyl group, an amino group, a hydroxy group or a thiol group;
wherein V, X, Z and M′ are as defined above.
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Ito Osamu
Nambu Nobuyoshi
Sato Shiho
Chelest Corporation
Edwards Newton
Gray J. M.
Smith Patent Office
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