摘要:
A process for preventing the corrosion of metals in aqueous systems by means of low-foam corrosion inhibitors consisting of alkanolamine salts of maleamic acids.
摘要:
Antifoams based on oil-in-water emulsions, in which the oil phase accounts for from 5 to 50% by weight of the emulsions and consists essentially of a mixture of (a) fatty esters of C.sub.12 -C.sub.22 -carboxylic acids with monohydric to trihydric C.sub.1 -C.sub.22 -alcohols, (b) polyglyceryl esters which are obtainable by at least 20% esterification of polyglycerols which contain at least 2 glyceryl units with at least one C.sub.12 -C.sub.36 -fatty acid and (c) fatty esters of C.sub.12 -C.sub.22 -carboxylic acids and polyalkylene glycols, the molecular weight of the polyalkylene glycols being up to 5,000 g/mol, and, if required, (d) long-chain alcohols, fatty esters of alcohols of at least 22 carbon atoms and C.sub.1 -C.sub.36 -carboxylic acids, distillation residues which are obtainable in the preparation of alcohols having a relatively large number of carbon atoms by oxo synthesis or by the Ziegler process and which may be alkoxylated, and/or (e) hydrocarbons having a boiling point above 200.degree. C. or fatty acids of 12 to 22 carbon atoms, are used for controlling foam in pulp digestion, in the beating of paper stock, in papermaking and in the dispersing of pigments for papermaking.
摘要:
Oil demulsifiers are based on an alkoxylate having a polydispersity of at least 1.7, and the alkoxylates are prepared using a metal alcoholate as a catalyst.
摘要:
Copolymers which containa) from 50 to 90% by weight of C.sub.8 -C.sub.40 -alkyl methacrylates, vinyl esters of C.sub.8 -C.sub.40 -carboxylic acids or mixtures thereof andb) from 10 to 50% by weight of monoethylenically unsaturated C.sub.3 -C.sub.12 -carboxylic acids, monoethylenically unsaturated dicarboxylic anhydrides, monoesters or monoamides of monoethylenically unsaturated C.sub.4 -C.sub.12 -dicarboxylic acids, amides of C.sub.3 -C.sub.12 -monocarboxylic acids or mixtures thereofas copolymerized units and have molecular masses of from 500 to 30,000 are used in at least partially neutralized form in aqueous solution or dispersion for making leather and furs water repellent.
摘要:
A process for the preparation of ether sulfonates or polyglycol ether sulfonates by reacting an organic alcoholic or phenolic compound or the corresponding alkoxylate in aqueous solution with vinyl sulfonate in the presence of from 0.1 to 3.0% by weight of an alkaline catalyst and, if required, additionally in the presence of a phase-transfer catalyst, and ether sulfonates or polyglycol ether sulfonates prepared by this process and of the general formulaR--O(C.sub.n H.sub.2n O).sub.z --CH.sub.2 CH.sub.2 SO.sub.3 Xwhere R is H or an aliphatic or aromatic hydrocarbon radical (which may contain nitrogen as a heteroatom) of 1 to 30 carbon atoms, n is from 2 to 30, z is from 0 to 300 and X is an alkali metal.
摘要:
The invention relates to fuels for Otto engines containing small proportions of the alkali-metal or alkaline-earth-metal salts of amic acids of the general formulaR.sup.1 R.sup.2 N--CO--A--COOHor of analogous partial amides of tricarboxylic or tetracarboxylic acids whose carbamoyl groups have the general formulaR.sup.1 R.sup.2 N--CO--,where A is the bivalent radical vinylene, ethylene, trimethylene, or tetramethylene and either R.sup.1 and R.sup.2 are identical or different, substituted or unsubstituted alkyls or alkenyls of from 5 to 75 carbon atoms or R.sup.1 is hydrogen and R.sup.2 is the group of the general formulaR.sup.3 R.sup.4 N--[C.sub.n H.sub.2n O].sub.x --C.sub.n H.sub.2n --,where R.sup.3 and R.sup.4 are identical or different hydrocarbon radicals of from 1 to 18--preferably from 4 to 13--carbon atoms, n is 3 or 4 (or 3 and 4), and x is from 4 to 99.
摘要翻译:本发明涉及含有小比例的通式为R 1 R 2 N-CO-A-COOH的酰胺酸的碱金属或碱土金属盐的奥托发动机的燃料,或者是羧酸或四羧酸类似的部分酰胺,其氨基甲酰基 具有通式R 1 R 2 N-CO-,其中A是二价基亚乙烯基,亚乙基,三亚甲基或四亚甲基,R 1和R 2是相同或不同的,取代或未取代的5至75个碳原子的烷基或烯基,或者R 1是氢 并且R 2是通式为R 3 R 4 N - [C n H 2n O] x -C n H 2n - 的基团,其中R 3和R 4是1至18个优选4至13个碳原子的相同或不同的烃基,n为3或4( 或3和4),x为4至99。
摘要:
The subject invention relates to salts of polymaleic acids having a molecular weight between 200 and 1500 and to their use in preventing the corrosion of metal caused by hydrogen sulfide and carbon dioxide in water-in-oil emulsions such as crude oil.