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| A number of methods have been developed in order to separate water from chemical mixtures. The known methods include the use of alkaline earth compounds, carbon molecular sieves, oleum, distillation, and membranes. Many of the known methods are disadvantageous because the processes are inefficient or uneconomical; the drying agents undergo undesirable side reactions and/or adsorbs or absorbs the material being dried.
Drying agents used principally in connection with circulating refrigerants include activated aluminum oxide, silica gels and molecular sieves in solid or granulated form. During use, these materials are abraded by the flow of the cooling liquid and mechanical vibrations and form dust particles. In order to prevent the dust from clogging the valves and conduits of the refrigeration system, a filter must be employed. This costs time (for installation) and money.
The compositions and method of the invention overcome the difficulties associated with the prior art. In particular, we have found that certain of the compositions that eliminate the need for a separate filter element.
The composition comprises a drying agent and a binder wherein: (a) said drying agent comprises an effective amount of a molecular sieve and said binder comprises an effective amount of a support comprising cellulose; (b) said drying agent comprises an effective amount of a molecular sieve and said binder comprises at least about 25 weight percent of a material selected from the group consisting of polyurethane foam and polyisocyanurate foam; or (c) said drying agent comprises an effective amount of a superabsorbent polymer and molecular sieve and said binder comprises an effective amount of a material selected from the group consisting of polyurethane foam, polyisocyanurate foam and a support comprising cellulose.
Desiccant CompositionThe relates desiccant composition drying agent binder Specifically following compositions (a) effective amount molecular sieve cellulose (b) least 25 weight percent material group polyurethane foam polyisocyanurate (c) superabsorbent polymer Drying AgentFor purposes terms indicated meanings Polymer homopolymer copolymer (not limited two components) mixtures thereof 000 100 preferably 85 crosslinked sufficiently impart moisture absorbing adsorbing Superabsorbent Synthetic Semi-Synthetic (defined below) swells twice volume water room temperature standing hours derivative naturally occurring chemical reactionExemplary Polymers limitation ethers modified starches derivatives gum Illustrative polymers related salts acrylamide acrylic acid ethylene oxide methacrylic polyethyleneimine polyvinyl alcohol pyrrolidone repeat unit branch extended carbon atoms four allyl preferred Polyacrylic sodium polyacrylate (such SXM70 SXM77 Stockhausen Greensboro North Carolina) potassium materials commercially UOP Plaines Illinois Grace Corporation Baltimore Maryland known sieves Type practice refrigeration applications Angstroms XH6 XH7 XH9 XH11 UOPMultiple agents Besides optionally employed activated alumina silica gel multiple used 99 1The selection agent(s) type depend (including equipment) produces shape hardness chosen withstand rigors avoid entrainment plugging openings conduits powder particles fibers shaped piece pieces2 BinderAny capable absorbed/adsorbed agent) organic plastic binders isocyanate-based phenolic resins aliphatic epoxy silicone polyphenylene sulfide poly(ether ketone) polyether sulfone Polyurethane purchased USPs 986 930 655 757 340 556 596 567 882 244 950 952 243 130 007 disclosures hereby referenceIt destroy case thermoplastic less 300 |
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