Abstract: Certain methylene phosphonic acid derivatives of aminohydrocarbyl piperazine-urea adducts are good threshold agents to prevent metal ion precipitation in aqueous solutions.

Abstract: Complexes of radionuclides with a compound of the formula ##STR1## wherein substituents A, B, X and Y are each independently selected from radicals including hydrogen, hydroxyalkyl (wherein the alkyl group contains 2-6 carbon atoms) phosphonic, sulfonic, methylenephosphonic, methylene-, ethylene- and propylene-sulfonic, carboxylic acid radicals (having 2-4 carbon atoms) and the alkali or alkaline earth metal, ammonia and amine salts, thereof and wherein at least one A, B, X and Y is methylenephosphonic acid or a salt thereof. Tc-99m complexes have been found useful for imaging the skeletal structure of animals.

Abstract: An improved process for making tetrarhodium dodecacarbonyl, Rh.sub.4 (CO).sub.12, reacts RhCl.sub.3.xH.sub.2 O with CO under about 200 psig (14.06 kg/cm.sup.2) at a temperature of about 50.degree. C. in the presence of copper metal and an alkali metal halide, e.g. NaCl. The product mixture is contacted with a chlorinated solvent, e.g. CH.sub.2 Cl.sub.2, which dissolves the desired product and is subsequently recovered by evaporating the solvent.

Abstract: New stable complexing agents for Tc-99m which are phosphonate derivatives of bicycloheptane bis(alkylamines) have been found which are useful in imaging the skeletal system in animals. The complexes readily clear through the kidneys with large amounts being taken up in the bone. The ratio of uptake in bone to that in soft tissue is high.

Abstract: Methylenephosphonic acid derivatives of bis(aminoalkyl)piperazine are employed as cement set retarding additives. The compounds must have at least one of the amine hydrogens phosphonomethylated.

Abstract: New compounds have been prepared from dicyclopentadiene bis(methylamine) which have the following formula ##STR1## wherein substituents A, B, X and Y each are independently selected from radicals including hydrogen, hydroxyalkyl (wherein the alkyl group contains 2-6 carbon atoms) phosphonic, sulfonic, hydroxyethyl- and hydroxypropyl-sulfonic, methylenephosphonic methylene-, ethylene- and propylenesulfonic, alkylcarboxylic acid radicals (having 2-4 carbon atoms) and the alkali or alkaline earth metal, ammonia and amine salts of any of the phosphonic, sulfonic or carboxylic acid derivatives. At least one of the substituents must be other than a hydrogen.

Abstract: The bis(methylamine) of norbornane compounds which have at least one of the amine hydrogens substituted with hydroxyalkyl, methylenephosphonic, alkylenesulfonic, carboxylic acid radicals and salts of any of the acid radicals are useful as chelating, sequestering agents. The phosphonate substituted compounds are also useful as threshold agents.

Abstract: Compounds having improved properties of inhibiting the precipitation of metal ions when used in threshold amounts have been made which are derivatives of ammonia or di- or polyamines in which the amine hydrogens have been substituted with both methylenephosphonic acid groups or their salts and hydroxypropyl quaternaryammonium halide groups. Thus, ammonia can have two hydrogens replaced with methylenephosphonic groups while the third is replaced with a hydroxypropyltrimethylammonium chloride group; and three hydrogens of ethylenediamine can be replaced with methylenephosphonic groups, the fourth being replaced with a hydroxypropyltrimethylammonium chloride group.

Abstract: New polymers which are the reaction product of aminoethylpiperazine and a dihalo or epoxyhalo compound are subsequently phosphonomethylated to provide products which are useful as threshold ion control agents.

Abstract: An improved process for removing crosslinked photoresist polymer from printed circuit boards which comprises contacting the printed circuit board with methylene chloride containing from about 5 to about 10 volume percent of a mixture of methanol and methyl formate. Each additive must be present at a minimum concentration of one volume percent. Stabilizers for the methylene chloride, such as epoxides, may be present at amounts no greater than about 0.5 volume percent.

Abstract: A catalyst useful for dehydrating an alkanolamine to form an alkylenimine is prepared by providing an aqueous or hydrofluoric acid solution of a tantalum or niobium compound, neutralizing this solution with ammonium hydroxide to precipitate the metal hydroxide, washing the precipitated metal hydroxide with water and subsequently dissolving it in an aqueous solution of a lower carboxylic acid, e.g. oxalic acid, applying the acid solution to a catalyst support to impregnate it with the metal hydroxide and finally drying and calcining the impregnated support to form the desired metal oxide catalyst. An alkaline earth metal oxide is optionally employed by impregnating the support with an aqueous solution of the alkaline earth metal hydroxide, preferably prior to the application of the catalyst.

Abstract: Certain methylenephosphonic acid derivatives of aminohydrocarbylpiperazine-urea adducts have been found to be good cement set-retarding additives.

Abstract: Metal pigments when combined with methylchloroform are stabilized by the addition of small amounts of aromatic diepoxides. Other known stabilizers against metals or the active of light and heat may be incorporated.

Abstract: An apparatus for the recovery of solvents from coated parts during the drying step which consists of a means for heating the air used to dry the parts, an insulated drying chamber, a liquid spray scrubber, a refrigeration section to condense solvent and a cross-exchanger which allows air coming into the refrigeration section to be cooled by that exiting therefrom. The cooled solvent-lean air is then passed to the heating means before being recycled to the drying step.

Abstract: The process of employing as a cement setting retarder a compound which is a phosphonomethylated derivative of a dimer or polymer which is the reaction product of ethylene dichloride or epichlorohydrin with aminoethylpiperazine wherein at least 50% of the amine hydrogen substituents are phosphonomethyl groups or an alkali metal, alkaline earth metal or ammonium salt thereof.

Abstract: A process for making a cationic starch which comprises reacting by heating starch with a quaternary amine chlorohydrin in the presence of an alkali metal oxide or hydroxide, adding thereto after a period of time an alkaline earth oxide or hydroxide and maintaining the mixture for a time and at a temperature sufficient to complete the reaction, neutralizing filtering, washing and recovering the cationic starch product.

Abstract: A reactor of the shell and tube type wherein the head on the first end of the reactor is divided by a partition. A reactant, e.g. oxygen, is passed into one side of the divided head, passed through the tubes containing catalyst on one side of the reactor which are available to that portion of the head. Upon exiting into the head at the opposite end of the reactor the reactant oxygen is mixed with another reactant, e.g. a chlorinated hydrocarbon, and fed into tubes on the other side of the reactor, which also contains catalyst, and wherein the oxidation of the chlorinated hydrocarbon occurs. The product gases exit on the side of the divided head opposite the oxygen inlet at the first end of the reactor. A heat exchange medium surrounds the tubes and circulates within the shell to either heat or cool the said tubes as necessary. When the catalyst employed in the reaction becomes coated with carbonaceous material the flow is reversed and the oxygen fed into that side of the reactor to regenerate the catalyst.

Abstract: Compounds having improved properties of inhibiting the precipitation of metal ions when used in threshold amounts have been made which are derivatives of ammonia or di- or polyamines in which the amine hydrogens have been substituted with both methylenephosphonic acid groups or their salts and hydroxypropyl quaternaryammonium halide groups. Thus, ammonia can have two hydrogens replaced with methylenephosphonic groups while the third is replaced with a hydroxypropyltrimethylammonium chloride group; and three hydrogens of ethylenediamine can be replaced with methylenephosphonic groups, the fourth being replaced with a hydroxypropyltrimethylammonium chloride group.

Abstract: An improved method of treating boiler water which employs an oxygen scavenging compound and a compound to control pH together with a chelating agent, wherein the chelating agent is hydroxyethylethylenediaminetriacetic acid.

Abstract: A process for making Fe-EDTA chelate comprising adding iron oxide at a ratio of <1 mole iron/mole EDTA to a mixture of NH.sub.4 OH and EDTA wherein NH.sub.3 /EDTA mole ratio is from 1.05 to 1.5, heating until reaction is complete, cooling to about 60.degree. C. and adding sufficient NH.sub.3 to dissolve and maintain Fe-EDTA chelate in solution, cooling to room temperature and oxidizing Fe.sup.++ to Fe.sup.+++. The process provides (1) a minimum of foaming and sludge formation during the reaction, (2) rapid dissolution of iron oxide and (3) a chelate product substantially completely in the ferric state.