Abstract: A process for the recovery of minerals from an ore or concentrate containing the same wherein the minerals are recovered in a froth from an aqueous pulp containing the ore or concentrate and wherein one or more mineral flotation agents are employed in the aqueous pulp to control the type of mineral in the froth is provided. The mineral flotation agent or agents employed in the process comprise sulfenyl dithiocarbamates characterized by the formula: ##STR1## wherein R.sub.1 and R.sub.2 are selected from the group consisting of hydrogen and hydrocarbyl groups with not more than one of R.sub.1 and R.sub.2 being hydrogen, n is 1 or 2, and R.sub.3 is a hydrocarbyl group.

Abstract: Halohydroxyalkylthio-substituted an dihydroxyalkylthio-substituted polycarboxylic acids and alkali metal salts thereof are effective corrosion inhibitors for various metal surfaces. In one embodiment, mineral acid compositions such as aqueous hydrochloric acid metal cleaning solutions exhibit diminished corrosiveness when corrosion inhibiting additives of the invention are present in the compositions.

Abstract: There are disclosed a method and apparatus for effecting a chemical reaction. There is provided an aspirator-mixer or zone to which the reaction mass is pumped to activate the same and into which another reactant is furnished and from which admixed reaction mass and reactant are discharged into a reaction zone in which the concentration or proportion of a vaporous or gaseous reactant is maintained at a level as desired by sucking therefrom into the suction side of the aspirator-mixer or zone any excess of such reactant. In one embodiment, a mercaptan is oxidized to corresponding disulfides with oxygen and the oxygen level in the reaction zone is maintained as desired by sucking off into the suction side of the aspirator-mixer any oxygen in the reaction zone in excess of that desired therein.

Abstract: Novel metal-working process and aqueous metal-working fluids are provided. The aqueous metal-working fluids contain at least one N,N'-dilactam disulfide as an extreme pressure (EP) additive.

Abstract: Ammonium dialkylaminoalkyl (thiocarbonyldithio) alkanoates, alkali metal dialkylaminoalkyl (thiocarbonyldithio) alkanoates, their use as flotation agents, and a process for the production of these novel compositions are disclosed. N,N-dialkylaminoalkyl mercaptoalkanoate, its use as an intermediate in the production of the novel ammonium dialkylaminoalkyl (thiocarbonyldithio) alkanoates and alkali metal dialkylaminoalkyl (thiocarbonyldithio) alkanoates, and a process for the production of this novel composition are also disclosed.

Abstract: A metalworking composition containing 2-hydroxyethyl-(3-chloro-2-hydroxypropyl)sulfide in an aqueous medium. A method for enhancing the extreme pressure lubricating properties of an aqueous metalworking composition by admixing therein 2-hydroxyethyl-(3-chloro-2-hydroxypropyl)sulfide.

Abstract: Ammonium dialkylaminoalkyl (thiocarbonyldithio) alkanoates, alkali metal dialkylaminoalkyl (thiocarbonyldithio) alkanoates, their use as flotation agents, and a process for the production of these novel compositions are disclosed. N,N-dialkylaminoalkyl mercaptoalkanoate, its use as an intermediate in the production of the novel ammonium dialkylaminoalkyl (thiocarbonyldithio) alkanoates and alkali metal dialkylaminoalkyl (thiocarbonyldithio) alkanoates, and a process for the production of this novel composition are also disclosed.

Abstract: There is disclosed an apparatus for effecting a chemical reaction. There is provided an aspirator-mixer or zone to which the reaction mass is pumped to activate the same and into which another reactant is furnished and from which admixed reaction mass and reactant are discharged into a reaction zone in which the concentration or proportion of a vaporous or gaseous reactant is maintained at a level as desired by sucking therefrom into the suction side of the aspirator-mixer or zone any excess of such reactant. In one embodiment, a mercaptan is oxidized to corresponding disulfides with oxygen and the oxygen level in the reaction zone is maintained as desired by sucking off into the suction side of the aspirator-mixer any oxygen in the reaction zone in excess of that desired therein.

Abstract: Novel compositions are provided for the cleaning and inhibiting corrosion of metallic surfaces. The cleaning composition has an active ingredient consisting of at least one sulfur containing compound selected from the group consisting of a bis(N-2 pyrrolidonyl), an (N-2 pyrrolidonyl), or a bis(N-succinimidyl) sulfur-containing compound.

Abstract: An improvement in the cetane number of diesel fuels is achieved through the addition of a small, but effective, amount of a dithiocarbamate or a sulfonamide.

Abstract: The addition reaction of hydrogen sulfide with an olefinically unsaturated alkyl carboxylate, to form a product mixture at least 55 weight percent alkyl mercaptoalkanoate, is made immune from significant effects on product selectivity caused by CO.sub.2 contamination of the hydrogen sulfide by selection of the addition catalyst from inorganic and organic bases having an ionization constant greater than 2.0.times.10.sup.-5 at 25.degree. C., such as triethylamine.

Abstract: A novel composition and process are provided for cleaning metallic surfaces. The aqueous cleaning composition comprises an effective amount of at least one thiomorpholine compound represented by the formula: ##STR1## where R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7, and R.sub.8 can be hydrogen or any hydrocarbyl radical having from 1 to 3 carbon atoms and where the total number of carbon atoms in R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7, and R.sub.8 not to exceed about 10 carbon atoms; and where R.sub.9 is hydrogen or any hydrocarbyl radical having from 1 to 8 carbon atoms, metal hydroxide, and water soluble surfactant.

Abstract: A novel composition and process are provided for cleaning metallic surfaces. The cleaning composition comprises an effective amount of at least one sulfur containing compound selected from the group consisting of a dialkylamino dithiocarbamic acid, a mercapto alkanone, or a trimethylene ring sulfur compound.

Abstract: An olefinically unsaturated alkyl carboxylate is reacted with hydrogen sulfide in the presence of a lower alkanol using an addition catalyst with water and/or sulfur cocatalyst to give an alkyl mercaptocarboxylate/dialkyl thiodicarboxylate mixture having a high proportion of the mercaptocarboxylate. If sulfur is contained in the cocatalyst, dialkyl dithiodicarboxylates are also formed. The resulting mixture on transesterification with a poly(oxyalkylene)-polyol gives a poly(oxyalkylene)-polyester-poly(monosulfide)-polythiol or a poly(oxyalkylene)-polyester-poly(monosulfide)-poly(disulfide)-polythiol having a good balance of properties.

Abstract: This invention relates to novel sulfur-containing organosilicon compounds comprising substituted dithiocarbamates and substituted sulfenate esters and the use of these novel compounds as reinforcing promoters for silica-filled rubber compositions.

Abstract: A sealant composition based on a mercaptan-terminated liquid polymer, fillers, plasticizer, and curing agent wherein the liquid mercaptan-terminated polymer employed is prepared from a mercapto acid or mercapto acid ester and a polyoxypropylene glycol, the polyoxypropylene glycol having been end-capped with ethylene oxide prior to esterification to give primary alcohol terminal groups. The cured sealant based on the ethylene oxide-end capped polymer exhibits a non-tacky surface, whereas a cured sealant based on a propylene oxide end-capped glycol exhibits a tacky surface.

Abstract: An olefinically unsaturated alkyl carboxylate is reacted with hydrogen sulfide in the presence of a lower alkanol using an addition catalyst with water and/or sulfur cocatalyst to give an alkyl mercaptocarboxylate/dialkyl thiodicarboxylate mixture having a high proportion of the mercaptocarboxylate. If sulfur is contained in the cocatalyst, dialkyl dithiodicarboxylates are also formed. The resulting mixture on transesterification with a poly(oxyalkylene)-polyol gives a poly(oxyalkylene)-polyester-poly(monosulfide)-polythiol or a poly(oxyalkylene)-polyester-poly(monosulfide)-poly(disulfide)-polythiol having a good balance of properties.

Abstract: A method for obtaining dialkyl dithiodialkanoates in which mercaptoalkyl esters are contacted with a halogen in an inert hydrocarbon solvent to produce a heavy liquid phase of dialkyl dithiodialkanoate and a separate liquid phase of hydrocarbon solvent. These phases are easily separated into the product dialkyl dithiodialkanoate and hydrocarbon solvent which can be recycled without further treatment. In an embodiment of the invention the dialkyl dithiodialkanoate is further contacted with alkylene oxide to neutralize residual acidic by-products in the reaction mixture.

Abstract: Poly(oxyalkylene)-polyester-poly(sulfide)-polythiol is prepared by ester interchange between an alkyl mercaptocarboxylate/dialkyl thiodicarboxylate mixture and a poly(oxyalkylene)-polyol. The resulting polymer is a liquid material having more than two, preferably at least three pendant thiol groups. This polymer exhibits exceptional stability and is well suited for sealant applications.

Abstract: A corrosion-resistant reactor suitable for high temperature/high pressure operation consisting essentially of ceramic-lined reaction and quench chambers.