Abstract: In order to eliminate the oxygen sensitivity of chromium carbide and vanadium carbide particles, vanadium carbide and chromium carbide particles are formed by carburizing a precursor compound at a elevated reaction temperature of about 950.degree. C. Initially, the precursor compound is heated in an inert nitrogen-containing gas to the reaction temperature. Once the reaction temperature is achieved, hydrogen and a carbon-containing gas such as methane or ethylene are used to conduct the carbonization. After the carbonization has been completed, the carbonizing gas is then replaced with an inert nitrogen-containing gas and the product allowed to cool down. The carbonization cycle is adjusted so that the oxygen level is kept to less than 0.35%, while the nitrogen level is kept at about 2%. Powders produced from this process show minimal or no oxygen pickup when exposed to ambient air.

Abstract: A method is disclosed for decomposing methylene iodide, including the following steps: providing a hydrophobic sorbent zeolite, exposing the zeolite to methylene iodide in the presence of water or water vapor, so that the methylene iodide is adsorbed on the water, heating the zeolite to a first temperature of at least 100.degree. to decompose the methylene iodide, and heating the zeolite to a second temperature of at least 400.degree. to regenerate its sorbent characteristics.

Abstract: A cyclic process of subjecting calcium sulfide particles to alternating oxidizing and reducing conditions. The impenetrable shell of calcium sulfate which forms during the oxidation phase of the cycle is destroyed by the subsequent reducing phase. By repeating the cycle many times the particles are converted completely into calcium oxide at a reasonable temperature of about 1000.degree. C. The process can be carried out in a fluidized bed reactor either by maintaining both oxidizing and reducing zones within the same fluidized bed or by varying the gas phase throughout the fluidized bed in a periodic manner.

Abstract: The invention provides a cleaning method for removing a rosin-base solder flux, using essentially a mixture of(A) a compound of the formula (1) ##STR1## wherein R.sup.1 is a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, R.sup.2 is an alkyl group having 1 to 5 carbon atoms, R.sup.3 is a hydrogen atom or a methyl group and k is an integer of 2 to 4,(B) a compound represented by the formula (2)R.sup.4 --O--(CH.sub.2 CH.sub.2 O).sub.m --H (2)wherein R.sup.4 is a straight- or branched-chain alkyl group having 6 to 20 carbon atoms, phenyl group or a phenyl group substituted with a straight- or branched- chain alkyl group having 7 to 12 carbon atoms and m is an integer 2 to 20,(C) a compound represented by the formula (3) ##STR2## wherein R.sup.

Abstract: The invention relates to a process for the rapid, high yield conversion of select rare earth oxides or hydroxides, to their corresponding carbonates by contact with supercritical carbon dioxide.

Abstract: According to the present invention, an improved method for preparing tetrathioperrhenate salts is provided. Basically, a water soluble, oxygen-containing rhenium compound such as rhenium oxide or a salt containing an oxyanion of rhenium, such as ReO.sub.4.sup.--, is contacted with an aqueous ammonium sulfide or polysulfide solution in the presence of a cation which is capable of forming an aqueous insoluble salt with tetrathioperrhenate.

Abstract: Zinc compounds of formula IICF.sub.3 CCl.sub.2 ZnCl.cndot.yL (II)wherein y is 1 or 2 and L is a solvent ligand selected from the group of the N-disubstituted acid amides, N-substituted lactams and the organic sulfoxides, are suitable for reaction with CO.sub.2, COS or SO.sub.2 to give, after working up, the acids of formula ICF.sub.3 CCl.sub.2 --X (I)wherein X is --CO.sub.2 H, --CSOH or --SO.sub.2 H, in good yield.