摘要:
A process for removing pollutants or minerals from lake, river or ocean sediments or from mine tailings is disclosed. Magnetically attractable collection units containing an ion exchange or sorbent media with an affinity for a chosen target substance are distributed in the sediments or tailings. After a period of time has passed sufficient for the particles to bind up the target substances, a magnet drawn through the sediments or across the tailings retrieves the units along with the target substance.
摘要:
A method for forming agglomerated ion exchange particles in which finely divided synthetic resin coating particles are affixed to the surface of synthetic resin substrate particles. The surface of the coating particles have ion exchange sites with monovalent counterions (e.g., negatively charged) which are attracted to the ion exchange sites on the substrate particles. Multivalent ions (e.g., carbonate) of the same charge as such monovalent counterions are mixed into an aqueous disperson of the coating particles to displace the monovalent counterions thereby increasing the electrostatic charge density of the coating particles. Then, a slurry of the synthetic resin substrate particles is added dropwise to this dispersion which is mixed to form agglomerates by electrostatic attraction.
摘要:
An anion exchange resin, containing Al(OH).sub.3 suspended therein, is reacted with aq. LiOH to form microcrystalline LiOH.2Al(OH).sub.3 which is then reacted with a halogen acid or halide salt to form microcrystalline LiX.2Al(OH).sub.3. The resin, after having a portion of the LiX eluted by using an aqueous wash, is used to recover Li.sup.+ values from aqueous brines.
摘要:
A method is disclosed for the separation of water soluble polyols. A solution containing the polyols is passed cyclically at different temperatures through a column containing ion exchange materials to separate the polyols.
摘要:
For on-site, continuous, bulk water purification, a dual-monitored, two-pass system employs two successive banks of mixed-bed, strong-based resin cylinders. Raw water first flows down through a bank of primary cylinders in parallel. The outlets of the primary cylinders are connected in parallel via an overhead carry-over pipe to a smaller bank of polisher cylinders whose outlets are connected in parallel via a final filter to a discharge outlet. Probes monitoring the concentration of impurities are located in the carry-over pipe and following the final filter. The efficient arrangement of cylinders in a van allows easy replacement of exhausted cylinders without interrupting water treatment.
摘要:
Described is an ion exchange resin prepared from a cross-linked vinyl-aromatic polymer carrying recurring active units of the formula --CH.sub.2 NHRPO(OH).sub.2 wherein R is a lower alkylene radical. Such resins are useful in selectively removing metal ions from solutions, and may be prepared, e.g., by reaction of a primary amino-substituted cross-linked copolymer with a phosphorus trihalide and a simple (C.sub.1 -C.sub.3) aldehyde.
摘要:
A redox resin capable of removing reducible metal ions effectively from aqueous solutions is described. This resin is obtained by polycondensation of a mixture of formaldehyde, pyrocatechol and an aromatic amine.
摘要:
A portable domestic water purification and filtration apparatus includes a container for treating water to having a reservoir for storing untreated water and a pump having an inlet connected to pump water from the bottom of the reservoir and an outlet connected within the container to the inlet of a filter device also located within the container. The filter device includes an integral outlet spout for discharging the filtered water over the upper edge of the container.
摘要:
An ion-exchange hollow fiber is prepared by introducing into the wall of the fiber polymerizable liquid monomers, and polymerizing the monomers therein to form solid, insoluble, crosslinked, ion-exchange resin particles which embed in the wall of the fiber. Excess particles blocking the central passage or bore of the fiber are removed by forcing liquid through the fiber. The fibers have high ion-exchange capacity, a practical wall permeability and good mechanical strength even with very thin wall dimensions. Experimental investigation of bundles of ion-exchange hollow fibers attached to a header assembly have shown the fiber to be very efficient in removing counterions from solution.
摘要:
The process of this invention is directed to the treatment of solid anion exchange resin with dry hydrogen chloride to enhance the ability of the resin to redistribute chlorosilanes.