Abstract: Chromatographic species are continuously separated by either elution or displacement HPLC using an apparatus that comprises a stationary inlet distribution manifold, a stationary chromatographic bed, and mobile collector receptacles.

Abstract: Visible gels are formed by mixing an inorganic crosslinking agent with a low viscosity aqueous solution having a low polyacrylamide content. The visible gels are employed to reduce the water/hydrocarbon permeability ratio of subterranean formations.

Abstract: Fused polynuclear aromatic compounds (PNAs) are continuously removed from a recycle oil stream in a hydrocracking process. An adsorption bed removes the PNAs from the recycle oil, a desorbing reagent removes the PNAs from the bed, and a regenerating agent regenerates the bed, all steps being performed simultaneously and continuously.

Abstract: The ICI viscosity of a paint is improved by incorporating into the paint a binder that comprises, in part, a supplemental polymer. The supplemental polymer comprises about 20 to about 60 weight percent of a substantially non-self-polymerizable monomer and about 40 to about 80 weight percent of a copolymerizable monomer having a water-soluble homopolymer. The supplemental polymer and binder are substantially inseparable by chromatographic means.

Abstract: There are disclosed normally tacky, pressure-sensitive adhesive compositions comprising one or more normally tacky polymers having a T.sub.g of about 0.degree. C. or less and containing pendant functional groups attached to the backbone and having the formula: ##STR1## in which R.sub.1 is a divalent organic radical at least 3 atoms in length, and X is organoacyl or cyano, the polymers preferably also being normally tacky when cured. Such polymers have markedly improved cohesive strength (shear holding value) with little or no detriment to adhesive tack or adhesion (peel resistance), and these improvements are realized without the necessity of incorporating cross-linking monomers such as N-methylolamides or other cross-linking agents. Pressure-sensitive adhesive, water-based emulsions containing such polymers and pressure-sensitive adhesive articles comprising a substrate having at least a portion of one surface thereof coated with the adhesive compositions are also disclosed.

Abstract: Permanently flexible and non-tacky coating mastic and caulking compositions having improved heat-age stability contain (a) at least one polymer having a T.sub.g of about -50.degree. C. to about -10.degree. C. and pendant functional groups attached to the polymer backbone and having the formula: ##STR1## in which R.sub.1 is a divalent organic radical at least 3 atoms in length, and X is organoacyl or cyano; (b) a zinc-containing pigment (e.g. zinc oxide); and (c) a polyphosphate anion in an amount effective for increasing the wet adhesion of the compositions, particularly of aged compositions. The mastics and caulks typically have total non-volatile matter concentrations of about 60 to about 90 weight percent of which about 15 to about 75 weight percent comprises the described polymer and about 25 to about 85 weight percent is the zinc-containing pigment and other non-volatile solid matter other than the polymer such as fillers, other pigments, etc.

Abstract: Polyamines having at least two amine groups are incorporated into a polymer system comprising an anionic surfactant and a polymer having at least one anionic pendant group. The resulting polymer system typically exhibits at least one improved physical property.

Abstract: Polyamines having at least two amine groups are incorporated into a polymer system comprising an anionic surfactant and a polymer having at least one anionic pendant group. The resulting polymer system typically exhibits at least one improved physical property.

Abstract: Latex-liopophilic polymers comprise of a lipophilic polymer and polymerized alpha, beta-ethylenically unsaturated monomer units are formed by polymerizing alpha, beta-ethylenically unsaturated monomer units in an aqueous medium containing a lipophilic polymer, an initiation catalyst, and, optionally, a graft promoting system. Typically, the latex-lipophilic polymer is a graft polymer having the lipophilic polymer as its backbone, and a plurality of the polymerized alpha, beta-ethylenically unsaturated monomer unit grafted onto the lipophilic backbone.

Abstract: Polymers (and especially hydroxyethylcellulose) are crosslinked using a lanthanide as a crosslinking agent. The crosslinked polymers have utility in well completion, well stimulation, enhanced oil recovery, and subterranean fluid containment operations.

Abstract: In situ hydrogenation in a subterranean formation is readily performed by introducing a non-gaseous hydrogen precursor into steam to form a composition. The composition is injected into the oil-bearing subterranean formation to enhance the recovery of the oil from the formation.

Abstract: A non-toxic drilling fluid (drilling mud), for use in rotary-type well-drilling operations, comprises a non-toxic base-oil consisting essentially of branched-chain paraffins which may or may not contain ester functionalities, the base-oil having: (i) between about 16 and about 40 atoms per molecule, (ii) a kinematic viscosity, at 40.degree. C., of between about 1 and about 16.5 centistokes; (iii) a flash point of at least about 90.degree. C.; and (iv) a pour point of less than about -40.degree. C. Preferably, the branched-chain paraffin used as the base-oil consists essentially of the dimer of 1-decene, which has a viscosity of about 5 centistokes at 40.degree. C. and which has 20 carbon atoms per molecule. The drilling fluid can be about 100 percent base-oil or can be an emulsion of the base-oil in water, in which case the amount of base-oil is at least about 30 volume percent, and is more preferably between about 65 and about 95 volume percent.

Abstract: Water-soluble iron complexes are produced by forming an aqueous reaction medium (a) comprising a sulfate source (e.g., ferric sulfate) and a ferric source (e.g., the ferric sulfate and a different ferric salt) and (b) having a pH and sulfate ion to ferric ion molar ratio sufficient to form the water-soluble iron complexes. Preferably, the molar ratio of sulfate ion to ferric ion in the reaction medium is about 0.5:1 to about 1.5:1. It is also preferred that the pH of the reaction medium be about 1 to about 3.

Abstract: A polymeric composition comprising a polymer and less than about 1 weight percent surfactant is useful for producing a high-gloss latex paint. The polymer comprises about 25 to about 60 weight percent of a soft monomer whose homopolymer has a T.sub.g of less than about -20.degree. C. and about 40 to about 75 weight percent of a hard monomer whose homopolymer has a T.sub.g of greater than about 30.degree. C., and has a calculated T.sub.g of about 15.degree. to about 35.degree. C., an actual T.sub.g of about 10.degree. to about 60.degree. C., and a particle size of less than about 250 nm.

Abstract: A thixotropic preflush fluid is employed in a well drilling operation to prevent loss of cement slurry to an air zone penetrated during the drilling operation. The preflush fluid comprises water, a cement, calcium sulfate, and a quick-hardening accelerator. Optionally, the preflush fluid also comprises a thickening agent.

Abstract: An acidic molasses-based liquid animal feed supplement stock including calcium and magnesium, so that the calcium to magnesium weight ratio is between about 1.5 and 3, and, optionally, non-protein nitrogen, is hardened into a solid form by the addition of a phosphorus-containing compound in a nutritionally appropriate amount. In a preferred embodiment a single homogeneous first solution containing the sugar or molasses and the soluble calcium and magnesium compound but containing no added phosphorus compound is prepared and stored until it is desired to manufacture the animal feed blocks. At that time a second solution containing phosphorus but no calcium, magnesium, or molasses is added to the first solution so that the blocking reaction can occur.

Abstract: The ability of a waste treatment process to remove selenium from a waste stream is improved by pretreating the waste with a compound selected from the group having the formulaX(ZO.sub.a).sub.b,Q.sub.m O.sub.n,ClO.sub.3,Cl.sub.2 O.sub.6,Br.sub.3 O.sub.8,I.sub.2 O.sub.5, andmixtures thereof, wherein X is a cation, Z is halogen selected from the group consisting of chlorine, bromine, and iodine, a is an integer from 1-3, b is an integer equal to the valence of X, Q is chlorine or bromine, and m and n are each 1 or 2, provided than m+n equals 3.

Abstract: Polymers comprised of a lipophilic polymer and polymerized alpha, beta-ethylenically unsaturated monomer units are formed by emulsion polymerizing alpha, beta-ethylenically unsaturated monomer units in an aqueous medium containing a lipophilic polymer having a pendant vinyl group and an initiation catalyst.

Abstract: Polyamines having at least two amine groups are incorporated into a polymer system comprising an anionic surfactant and a polymer having at least one anionic pendant group. The resulting polymer system typically exhibits at least one improved physical property.

Abstract: Permanently flexible and non-tacky coating mastic and caulking compositions having improved heat-age stability contain (a) at least one polymer having a T.sub.g of about -50.degree. C. to about -10.degree. C. and pendant functional groups attached to the polymer backbone and having the formula: ##STR1## in which R.sub.1 is a divalent organic radical at least 3 atoms in length, and X is organoacyl or cyano; (b) a zinc-containing pigment (e.g. zinc oxide); and (c) a polyphosphate anion in an amount effective for increasing the wet adhesion of the compositions, particularly of aged compositions. The mastics and caulks typically have total non-volatile matter concentrations of about 60 to about 90 weight percent of which about 15 to about 75 weight percent comprises the described polymer and about 25 to about 85 weight percent is the zinc-containing pigment and other non-volatile solid matter other than the polymer such as fillers, other pigments, etc.