Abstract: A process for selectively converting adsorbable hydrocarbon feeds containing straight-chain and slightly branched-chain hydrocarbons to olefins by contacting the feeds with crystalline silicates.
Abstract: Method for enhancing electron spin resonance signals from crude petroleum by contacting the crude petroleum with a chemical which effects the population of free radical asphaltenes in the crude petroleum. The enhancement is in a positive sense when the chemical is a halogen and particularly iodine. The enhancement is in a negative sense (suppression) when the chemical is ferric chloride.
Abstract: Hydrogenated amorphous silicon solar cells which incorporate a thin insulating layer between a photoactive layer of intrinsic hydrogenated amorphous silicon and a heavily doped radiation incident N or N.sup.+ -type layer of hydrogenated amorphous silicon.
Abstract: A sealed thermosiphoning solar energy system is disclosed which uses oil as a nonfreezing transport fluid. The oil is heated in an absorber exposed to the sun's radiation, passes through a check valve and into thermal exchange with a second fluid. Expansion means are provided to prevent excessive pressure buildup in the system.
Abstract: A hydrocarbon material is subjected to severe hydrotreatment and washed with only enough water to absorb the bulk of the H.sub.2 S but only a fraction of the NH.sub.3 present in the hydrocarbon material. The washed hydrotreated hydrocarbon material is separated from the water stream, and then a vapor phase is separated from the hydrocarbon material in a high pressure separator. The vapor phase is scrubbed with water to form an aqueous solution of NH.sub.3 which contains only a minor amount of H.sub.2 S (an NH.sub.3 to H.sub.2 S ratio of at least 6:1).
Abstract: A process for the preparation of calcium fluoride from industrial waste waters which comprises treatment of the waste waters with potassium hydroxide, followed by lime precipitation, neutralization with carbon dioxide and filtration to provide the calcium fluoride product.
Abstract: A method of manufacture of a catalyst for hydrodemetalation of feedstocks having a calculated pore diameter of at least 125 Angstroms; a surface area of at least 100 m.sup.2 /g; a pore volume of at least 0.5 cc/grams; with at least 5% of the pore volume present provided by pores having a diameter of at least 1000 Angstroms and containing no more than 6% of catalytic metals from Group VIB and no more than 3% of catalytic metals from Group VIII.
Abstract: Disclosed is a process for reducing the fouling in a heat exchanger in which a hydrocarbon stream is heated or cooled as it passes through the heat exchanger. From 1 to 500 parts per million of a dialkyl fatty-acid amide is added to the stream to reduce fouling.
Abstract: A passive thermosiphon loop of circulating heat transport liquid transfers heat from an inclined absorber to a heat exchanger in thermal contact with a second fluid. Reverse thermosiphoning under normal conditions is prevented by a ball type check valve. Due to differences in the thermal expansion between the valve ball and the transport liquid, the valve will, however, permit reverse thermosiphoning at high temperatures.
Abstract: A process is disclosed for recovery of cobalt from spent catalyst particles. The particles are roasted, leached with an ammonia/ammonium salt leach solution and then leached with a cyanide ion leach solution.
Abstract: Compounds of the formula ##STR1## wherein R is aliphatic hydrocarbyl, alicyclic hydrocarbyl or aryl suitably substituted, if desired, or a heterocyclic group, R.sup.1 is hydrogen or alkyl, R.sup.2 is alkyl or alkoxy, R.sup.3 is ##STR2## wherein a is 0 or 1, R.sup.4 is hydrogen or CW'.sub.3, the W' being hydrogen or halogen, Z is halogen and X is halogen, hydroxy, alkoxy, acetoxy, carbethoxyalkoxy, phenoxy, alkylthio, carbethoxyalkylthio, phenylthio, phosphono, dithiophosphonoxy, phosphoramido, isocyanato, isothiocyanato, alkyl- and dialkylthiocarbamoylthio, alkyl- and dialkylcarbamoyloxy, alkylsulfonyl, etc., have herbicidal activity.