Abstract: Disclosed is a process for producing a zinc pyrithione product having an acceptable white or off-white color and containing substantially no undesired 2-hydroxypyridine-N-oxide or metal salt complexes thereof, by(1) making sodium pyrithione by reacting a 2-halopyridine-N-oxide with sodium hydrosulfide and sodium carbonate (or a mixture of sodium carbonate and sodium hydroxide) under selected addition temperatures and reaction temperatures and in selected mole ratios; followed by(2) making zinc pyrithione by reacting the sodium pyrithione with a zinc salt.

Abstract: Disclosed is a method for removing dissolved oxygen from a liquid (e.g., aqueous) system which comprisesadding to said liquid system an effective amount of an oxygen-scavenging chemical selected from 1,2-dihydro-1,2,4,5-tetrazines of the formula ##STR1## wherein R.sub.1 and R.sub.2 are individually selected from lower alkyl groups having 1 to 4 carbon atoms and phenyl.

Abstract: Unreacted diisocyanate is removed from a polyurethane prepolymer reaction product mixture by co-distillation of the unreacted diisocyanate with a compound which is at least partially miscible with the prepolymer and which boils at a temperature greater than the boiling point of the diisocyanate. A highly efficient removal rate is achieved in that the concentration of unreacted diisocyanate remaining in the reaction product mixture is generally less than about 0.1 percent, and in many cases less than about 0.05 percent, based on the weight of the prepolymer.

Abstract: Disclosed is the use of 2,4-di(lower alkyl)-1,2,4-thiadiazolidin-3,5-diones as ashless load-carrying additives for functional fluids. These thiadiazolidin-3,5-diones have the formula: ##STR1## wherein R.sub.1 and R.sub.2 are lower alkyl groups having 1-4 carbon atoms.

Abstract: 1-halo- and 1-lower alkoxy-4-trichloromethylphthalazines are disclosed as fungicides and as novel compositions of matter.

Abstract: A process for recovering fluorine and silicon values from a waste-water stream produced in a wet-process phosphoric acid process which comprises:(a) diluting concentrated sulfuric acid with the waste-water stream and producing an SiF.sub.4 -containing gas during the dilution;(b) scrubbing the SiF.sub.4 -containing gas with phosphoric acid to produce a phosphoric acid solution containing fluosilicic acid;(c) reacting sodium carbonate with the phosphoric acid solution to precipitate solid sodium silicofluoride; and(d) separating the solid sodium silicofluoride from the phosphoric acid.

Abstract: A method for hydrolyzing urea in aqueous solutions such as waste-water streams which comprises heating the aqueous solution containing urea in the presence of a catalytic amount of vanadium pentoxide for sufficient time and at sufficient temperatures to effect hydrolysis of substantially all of the urea to ammonia and carbon dioxide.

Abstract: Process for preparing fluoroaromatic or fluoropyridines by diazotization-fluorination of aromatic or heterocyclic amines in a solution of hydrogen fluoride containing selected tertiary amine compounds.

Abstract: Corrosion inhibiting compositions are described which contain a hydrazine compound, an organometallic complex and preferably a quinone compound. The organometallic complex is the reaction product of a cobaltous or manganous hydroxide and one or more aromatic ligands containing at least two hydroxy functional groups, or at least one amino and one hydroxy group, in the ortho position with respect to one another. The quinone compound is preferably added to these compositions in order to render the compositions compatible with chelating phosphonate scale control agents. The use of these compositions as oxygen scavengers in corrosive environments is also described.

Abstract: A process for hydrolyzing urea in waste water streams which comprises introducing a waste water stream containing urea into a carbon dioxide recovery system such as used in connection with the production of ammonia, and therein hydrolyzing substantially all of the urea in the waste water stream.

Abstract: A solvent composition is disclosed which comprises a halogenated hydrocarbon and a monohydric alcohol. This composition is used to clean polyurethane foam generating equipment.

Abstract: Selected amines are used as catalysts in the preparation of polyurethane foam.

Abstract: Functional fluid systems, i.e. hydraulic fluid and heat transfer fluid systems, containing alkoxysilane cluster compounds having the formula RSi[OSi(OR').sub.3 ].sub.3 wherein R is hydrogen, an alkyl, alkenyl, aryl or aralkyl group and each R' is independently selected from the same group as R with the proviso that at least a majority of R' radicals are sterically hindered alkyl groups having at least 3 carbon atoms, are described.

Abstract: Functional fluid systems, i.e., hydraulic fluid and heat transfer fluid systems, containing alkoxysilanol cluster compounds having the formula RSi[OSi(OR').sub.3 ].sub.2 OH wherein R is hydrogen, an alkyl, alkenyl, aryl or aralkyl group and each R' is independently selected from the same group as R with the proviso that at least a majority of R' radicals are sterically hindered alkyl groups having at least 3 carbon atoms, are described.

Abstract: Selected tetrafunctional methylene-bridged aromatic isocyanates and a method for their preparation are disclosed. The utility of these isocyanates as cross-linking agents for polyurethanes is also disclosed.

Abstract: A process for preparing anhydrous metal fluorides is described wherein metal is reacted with HF and halogen in the presence of a nitrile.

Abstract: Selected Schiff bases of aromatic and alkylsubstituted aromatic ortho diamines are employed as cross-linking agents in the preparation of high resilience polyurethane foam.

Abstract: An improvement is disclosed in the oxidation of reduced vat and sulfur dyes to develop their color and improve its fastness in dyed textiles. The improvement is in using an alkali metal bromite as an oxidizing agent for these dyes.

Abstract: Hydroxyoxetanes of the formula ##STR1## wherein R and R' are each selected from the group consisting of hydrogen and alkyl of from 1 to 5 carbon atoms.

Abstract: Flame retardant polyurethane foams are prepared from compositions containing as flame retardant additives, a select group of halogenated phosphate esters.