Abstract:
Hydrogen sulfide is produced by charging a sulfur containing feed to a molten metal bath containing over 3 wt.% dissolved carbon. Allowing dissolved carbon levels to build up in the bath, preferably by controlling oxygen addition to ensure a large inventory of dissolved carbon, creates a reducing "atmosphere" in the molten metal bath which allows most of the feed sulfur to be converted to H2S, which can be converted to elemental sulfur using a Claus unit or similar technology. Oxygen addition, to burn carbon from the bath, preferably occurs at a different time or place in the bath than the time or place of sulfur containing feed addition.
Abstract:
An improved "magnetic hook"-promoted catalytic process, catalyst and method of manufacture for heavy hydrocarbon conversion, optionally in the presence of nickel and vanadium on the catalyst and in the feed stock to produce lighter molecular weight fractions, including more gasoline, lower olefins and higher isobutane than normally produced. This process is based on the discovery that two "magnetic hook" elements, namely manganese and chromium, previously employed as magnetic enhancement agents to facilitate removal of old catalyst, or to selectively retain expansive catalysts, can also themselves function as selective cracking catalysts, particularly when operating on feeds containing significant amounts of nickel and vanadium, and especially where economics require operating with high nickel- and vanadium- contaminated and containing catalysts. Under such conditions, these promoted catalysts are more hydrogen and coke selective, have greater activity, and maintain that activity and superior selectivity in the presence of large amounts of contaminant metal, while also making more gasoline at a given conversion.
Abstract:
A binder for a mold or core prepared via a cold box process eliminates the use of organic solvents, the presence of free formaldehyde or phenol emanating from binders containing phenolic resins and prevents premature curing by the use of a binder comprising a polyol and an organic polyisocyanate. The binder is mixed with a foundry aggregate to form a foundry mix which is shaped into a mold or core in the presence of a gaseous tertiary amine catalyst. The mold or core is utilized in metal casting.
Abstract:
This invention relates to a liquid composition for the control of pitch deposition in pulp and paper making comprising an aqueous solution of (1) a derivatized cationic guar, and (2) a nonionic polymer. The invention also relates to a process for inhibiting pitch deposition in pulp and papermaking systems and on papermaking equipment.
Abstract:
This invention relates to heat curable foundry binder systems comprising as separate components (a) a caustic solution of an alkali silicate and (b) hydrated aluminum silicate. The solution is mixed with sand to form a foundry mix. The resulting foundry mix is shaped and heated at an elevated temperature to form a cured foundry shape. Heat is applied by warm air, baking in an oven, microwave, or preferably from hot-box equipment.
Abstract:
Sequential processing of hydrogen rich and hydrogen deficient feeds (14 and 16) in a heat balanced, single molten metal bath (40) to produce both 90+ mole % hydrogen (90) and one or more lower purity vapor streams (140) is disclosed. The molten metal bath is heated by oxygen addition (18) to burn dissolved carbon from the bath and then cooled by sequential addition of two feeds with differing hydrogen contents. Preferably a 98 % hydrogen product with a pressure of at least 2 atm., absolute is obtained, along with a lower purity hydrogen containing stream and a separate carbon oxides flue gas stream.
Abstract:
One or more (preferably three) simple single-chamber crucibles contain molten metal and are successively fed hydrocarbon feed to produce hydrogen, then fed oxygen-containing gas to produce CO, then fed hydrocarbon again, etc. Operation is controlled by a swing valving sequence under timer or composition control.
Abstract:
The invention relates to amine modified polyisocyanates having urea linkages and their use in foundry binder systems. The modified polyisocyanates are prepared by reacting a polyisocyanate with an aliphatic primary or secondary amine. These amine modified polyisocyanates, along with a phenolic resole resin, are added to a foundry aggregate to form a foundry mix which is shaped and cured with an amine curing catalyst.
Abstract:
This invention relates to a water-based coating comprising as separate components (A) a grind component comprising in admixture (1) a water compatible overbased alkaline earth alkyl-aryl sulfonate, (2) an organic amine, and (3) an inorganic borate corrosion inhibitor; and (B) a liquid component comprising (1) water, (2) an acrylic emulsion, (3) an organic amine. The coatings are particularly useful for coating ferrous metal surfaces.
Abstract:
The invention relates to a cold-box process for preparing foundry shapes. The process involves curing a foundry shape by subjecting it to carbon dioxide and heat. The foundry shape is made by mixing an aggregate with a foundry binder comprising: (a) an aqueous basic solution of a phenolic resole resin; and (b) preferably a compound which is a source of an oxyanion. The invention also relates to a process of making metal castings with the foundry shapes.