Abstract:
In the process for preparing methyl tert.-alkyl ether comprising the steps of (a) contacting and reacting in the liquid phase a reaction mixture formed by combining a stream consisting essentially of C4-C5 hydrocarbons and containing at least some proportion of isoalkylene and a stoichiometric excess of methanol, with respect to the isoalkylene, to form a reaction product comprising methyl tert.-alkyl ether, unreacted methanol and unreacted C4-C5 hydrocarbons; (b) isolating the methyl tert.-alkyl ether from the reaction product; and (c) recovering the unreacted methanol from the residual portion of the reaction product; the improvement which comprises selectively adsorbing the methanol constituent of said residual reaction product in a bed of crystalline molecular sieve adsorbent and recovering same by desorption using as a purge-desorption stream, the C4-C5 hydrocarbon stream used to prepare the initial reaction mixture.
Abstract:
Process for producing tool steel wherein a vanadium additive consisting essentially of chemically prepared, substantially pure V2O3 is added to a molten steel having a carbon content above about 0.35 wt. % and containing silicon in an amount of from about 0.15 to about 3.0 wt % and wherein a slag covering the molten steel contains CaO and SiO2 in a weight ratio (CaO/SiO2) which is equal to or greater than unity.
Abstract:
A process which effectively separates and recovers natural gas liquids from a natural gas stream containing nitrogen, regardless of the magnitude of the nitrogen concentration or changes in the nitrogen concentration.
Abstract:
Polyorganosiloxanes that are curable to crosslinked solid material, at ambient temperature upon exposure to gaseous oxygen, wherein the polyorganosiloxane contains, per molecule, at least one monovalent olefinically polyunsaturated organic radical containing at least one 1,3-pentadienylene group or 1,4-pentadienylene group bonded to silicon through silicon-to-carbon bond and wherein any remaining valence of silicon is satisfied by a silicon-to-oxygen-to-silicon bond or by a monovalent organic radical free of more than one olefinically unsaturated group per monovalent organic radical, which monovalent organic radical is bonded to silicon by a silicon-to-carbon bond. Compositions are also described containing the novel polyorganosiloxanes, suitable driers either chemically combined in the polyorganosiloxane or physically mixed therewith. The compositions can also contain fillers, plasticizers and/or catalyst activators.
Abstract:
The instant process relates to a process for treating zeolitic aluminosilicates which contain insoluble fluoride compounds by the use of soluble aluminum compounds.
Abstract:
Interlocking closure fastening devices (14) having controlled separation characteristics wherein the interdigitating hooks (24', 30') on one side of each closure element are longer, and/or larger than the interdigitating hooks (23', 29') on the opposite side of each closure element. In another embodiment, the controlled separation characteristics are obtained by forming the profile portion of the closure elements from stiffer plastic material. Combination of the two embodiments provides optimum controlled separation characteristics.
Abstract:
A method for manufacturing solid state electrochemical cells comprising isostatically compressing a cell subassembly comprising a malleable metal anode at a pressure of between about 10,000 and 100,000 psi.
Abstract:
A solid state electrolyte for solid state cell systems comprising a crystalline cation conductor of the composition SiS2, Li2S, such as crystalline Li2SiS3.
Abstract:
A moldable and compatible blend of 5 to 95 weight percent of an aromatic polyformal comprising from about 20 weight percent to 100 weight percent of repeating units (I), and from 0 weight percent to about 80 weight percent of repeating units (II), in which the repeating units (I) and the repeating units (II) are connected by interbonding units (III), wherein Y is selected from alkyl groups of 1 to 4 carbon atoms, chlorine or bromine, each z, independently, has a value of from 0 to 4 inclusive, n has a value of 0 or 1, and R1 is a divalent saturated or unsaturated aliphatic hydrocarbon radical, O, CO, SO2, S or a direct bond, with the proviso that when R1 is SO2 then repeating unit (II) is not the same as repeating unit (I), and 95 to 5 weight percent of a styrene copolymer or terpolymer and/or vinyl chloride containing polymers.
Abstract:
Tar-depleted liquid smoke solutions are made by generating a smoke vapor in a suitable smoke generator (51), selectively solvent extracting the tars from the smoke vapor, and absorbing the color, flavor and odor constituents of the smoke vapors into an aqueous medium. The aqueous tar-depleted liquid smoke (62) has a high coloring ability, a high concentration of carbonyls, and a low phenol content.