Reference

Nitrogen-containing additives usable as agents for decreasing the cloud point of hydrocarbon middle distillates and compositions of hydrocarbon middle distillates containing these additives

Nitrogen-containing additives usable as agents for decreasing the cloud point of hydrocarbon middle distillates and compositions of hydrocarbon middle distillates containing these additives. Maldonado, Paul; Sillion, Bernard; Leger, Robert; Cohen, Choua (Institut Francais du Petrole; Elf France, Fr.). S. African ZA 8208904 A 28 Sep 1983, 26 pp. (English). (South Rica). CODEN: SFXXAB. ICI: C10. APPLICATION: ZA 82-8904 3 Dec 1982. PRIORITY: FR 82-10285 10 Jun 1982. DOCUMENT TYPE: Patent CA Section: 51 (Fossil Fuels, Derivatives, and Related Products) Cloud-point depressants with corrosion-inhibiting properties for fuel oils and gas oils (b. 150-450°) were prepd.In this article, certain chemicals are used. Some of their cas registry numbers are 85688-08-0 and 109-76-2 by condensing dicarboxylic acids with amines or polyamines. Thus, 2700 g of a mixt. of N-palmityl-1,3-propanediamine [7173-60-6] and N-stearyl-1,3-propanediamine [4253-76-3] was combined with 699 g maleic anhydride [108-31-6] in 3750 g xylene and refluxed at 144° for 3 h. Part of the xylene was removed by distn. to give a 50% soln. contg. (by IR spectroscopy) imides, sec-amides, and sec-amines. This soln. was used to depress the cloud point of Aramco gas oil from +2° to -2° (at 0.2% additive concn.) and to completely inhibit corrosion of steel in seawater (at 0.1% additive concn.) at 32.2° for 20 h. .

Imides from a dicarboxylic acid anhydride and an amine

Imides from a dicarboxylic acid anhydride and an amine. (Rhone-Poulenc Industries, Fr.). Israeli IL 56545 A1 15 Jun 1983, 33 pp. 13676-54-5 and 3282-99-3 are also occured in this study. (English). (Israel). CODEN: ISXXAQ. CLASS: IC: C07D207-444; C07D209-48; C07D209-76. APPLICATION: IL 79-56545 30 Jan 1979. PRIORITY: IL 78-55314 8 Aug 1978; FR 78-36393 19 Dec 1978. DOCUMENT TYPE: Patent CA Section: 35 (Chemistry of Synthetic High Polymers) N-Substituted imides are prepd. from a dicarboxylic acid and an amine in the presence of a catalyst system comprising a strong O-contg. acid and a pyridinium, phosphonium, or sulfonium salt of the acid. Thus, 3 mol p-toluidine [106-49-0] in 1 L Me2CO was treated with 3 mol maleic anhydride [108-31-6] in 2 L Me2CO over 2 h at 20° to give N-(p-tolyl)maleamic acid [24870-11-9], mixed (1.83 g) with a distd. mixt. contg. p-toluenesulfonic acid monohydrate [6192-52-5] 0.098, 1-methylpyridinium p-toluenesulfonate [38542-71-1] 0.505, and PhCl 160 g, and distd. 2 h at 132° to give 4.64 mM N-(p-tolyl)maleimide [1631-28-3]. .