摘要:
In the thermal processing of crude alkanolamines, a method of inhibiting color formation in the alkanolamines comprising adding an amount, effective for the purpose, of an alkali metal hydroxide or sulfite, or mixtures thereof.
摘要:
The present invention is directed to the use of a solution of a percarbonate compound to prevent fouling during the basic washing of hydrocarbons containing oxygenated compounds. More specifically, oxygenated compounds such as carbonyl containing organics have a tendency to polymerize, producing fouling elements when such are contained in hydrocarbons being washed with basic materials. Solutions of percarbonate compounds are quite effective in reducing the fouling tendencies due to these specific mechanisms.
摘要:
Phosphorus derivatives of polyalkenylsuccinimides and methods of use of such derivatives as antifoulants in liquid hydrocarbonaceous mediums, such as crude oil, during processing at elevated temperatures are disclosed. The derivatives are formed via reaction of a polyalkenylsuccinimide intermediate with formaldehyde and a phosphorus compound having at least one acidic hydrogen P-H bond. The intermediate is first formed via reaction of polyalkenylsuccinic anhydride and polyamine.
摘要:
2'-hydroxy-4' or 5'-alkylacetophenone oximes and 2-hydroxy-4 or 5-alkylbenzaldehyde oximes are used to deactivate iron species contained in hydrocarbon fluids. Left untreated, iron leads to decomposition of the hydrocarbon, resulting in the formation of gummy, polymer masses in the hydrocarbon liquid.
摘要:
A composition and method of use for inhibiting the polymerization of acrylate esters during elevated temperature processing and during storage and handling thereafter.It comprises the combination of a Mannich reaction product, which is prepared from a substituted phenol, an aldehyde and ethylenediamine, and either phenylenediamine or derivatives thereof and/or phenothiazine or derivatives thereof.
摘要:
Catalyst compositions which are particularly useful for the preparation of ethylene polymers having a narrow molecular weight distribution are obtained by (1) drying an inorganic oxide having surface hydroxyl groups, e.g., silica, alumina, magnesia, etc., to remove adsorbed water, (2) reacting the surface hydroxyl groups with at least a stoichiometric amount of an organometallic compound having at least one alkyl group attached to a Group III metal, e.g., a trialkylaluminum, (3) reacting the thus-treated inorganic oxide with a vanadium halide, such as (a) VOCl.sub.3, VOBr.sub.3, and/or mono-, di-, and/or trihydrocarbyloxy derivatives thereof and/or (b) VCl.sub.4, VBr.sub.4, and/or mono-, di-, tri-, and/or tetrahydrocarbyloxy derivatives thereof, and (4) reacting that reaction product with at least about 0.1 mol, per mol of organometallic compound, of an alcohol containing 1 to 18 carbon atoms.
摘要:
Methods for inhibiting pyrophoric iron sulfide activity are disclosed. Methods are disclosed for inhibiting the sulfidation of iron oxides to iron sulfides and/or the oxidation of iron sulfide to inhibit pyrophoric activity. The methods comprise contacting iron oxides and/or iron sulfide with a liquid, solution, aerosol, or gaseous inhibitor comprising alkylamines, arylamines, imines; oxygen-containing compounds such as alcohols, aldehydes, esters, acids and ketones; mixed nitrogen-containing and oxygen-containing compounds such as alkanolamines, non-polymeric amides, hydroxylamines, Mannich products, polyisobutylenesuccinimides, oximes; sulfur-containing compounds and phosphorus-containing compounds.
摘要:
Disclosed are methods for dispersing sulfur in aqueous systems comprising adding an alkylcarboxylic acid compound to the system. This prevents fouling of the aqueous system by the precipitated sulfur.
摘要:
Methods and compositions are provided for inhibiting the polymerization of acrylic acid monomers during elevated temperature processing thereof or during storage or shipment of acrylic acid product. The compositions comprise a combination of a cerium source compound and an aromatic amine compound. The methods comprise adding from about 1 to about 10,000 parts per million to the particular acrylic acid containing medium for which such polymerization inhibition is desired, per million parts of the acrylic acid medium.
摘要:
Phosphorus derivatives of polyalkenylsuccinimides and methods of use of such derivatives as antifoulants in liquid hydrocarbonaceous mediums, such as crude oil, during processing at elevated temperatures are disclosed. The derivatives are formed via reaction of a polyalkenylsuccinimide intermediate with formaldehyde and a phosphorus compound having at least one acidic hydrogen P--H bond. The intermediate is first formed via reaction of polyalkenylsuccinic anhydride and polyamine.