Reaction with sulfuric acid

In the commonly used Welland process, calcium cyanamide, made from calcium carbonate, is converted to cyanamide by reaction with carbon dioxide and water. Dicyandiamide is fused with ammonium nitrate to form guanidine nitrate. Dehydration with 96% sulfuric acid gives nitroguanidine which is precipitated by dilution. In the aqueous fusion process, calcium cyanamide is fused with ammonium nitrate ia the presence of some water. The calcium nitrate produced is removed by precipitation with ammonium carbonate or carbon dioxide. The filtrate contains the guanidine nitrate that is recovered by vacuum evaporation and converted to nitroguanidine. Both operations can be mn on a continuous basis (see Cyanamides). In the Marquerol and Loriette process, nitroguanidine is obtained directly ia about 90% yield from dicyandiamide by reaction with sulfuric acid to form guanidine sulfate followed by direct nitration with nitric acid (169—172). [Pg.16]

Sulfated Acids, Amides, and Esters. Reaction with sulfuric acid may be carried out on fatty acids, alkanolamides, and short-chain esters of fatty acids. The disodium salt of sulfated oleic acid is a textile additive and an effective lime soap dispersant. A typical sulfated alkanolamide stmcture is CiiH23C0NHCH2CH20S03Na. Others include the sulfates of mono and diethanolamides of fatty acids in the detergent range. The presence of... [Pg.244]

Sulfated Natural Oils and Fats. Sulfated natural triglycerides were the first nonsoap commercial surfactants introduced in the middle of the nineteenth century. Since then sulfates of many vegetable, animal, and fish oils have been investigated (see also Fats AND FATTY oils). With its hydroxyl group and a double bond, ricinoleic acid (12-hydroxy-9,10-octadecenoic acid) is an oil constituent particularly suited for sulfation. Its sulfate is known as turkey-red oil. Oleic acid is also suited for sulfation. Esters of these acids can be sulfated with a minimum of hydrolysis of the glyceride group. Polyunsaturated acids, with several double bonds, lead to dark-colored sulfation products. The reaction with sulfuric acid proceeds through either the hydroxyl or the double bond. The sulfuric acid half ester thus formed is neutralized with caustic soda ... [Pg.244]

Boric oxide is an excellent Lewis acid. It coordinates even weak bases to form four-coordinate borate species. Reaction with sulfuric acid produces H[B(HSO 4] (18). At high (>1000° C) temperatures molten boric oxide dissolves most metal oxides and is thus very corrosive to metals in the presence of oxygen. [Pg.189]

Notice in the list of Lewis bases just given that some compounds, such as carboxylic acids, esters, and amides, have more than one atom ivith a lone pair of electrons and can therefore react at more than one site. Acetic acid, for example, can be protonated either on the doubly bonded oxygen atom or on the singly bonded oxygen atom. Reaction normally occurs only once in such instances, and the more stable of the two possible protonation products is formed. For acetic add, protonation by reaction with sulfuric acid occurs on... [Pg.59]

Three major non-polymer propylene derivatives are isopropanol, acetone, and acrylic acid. Isopropanol (isopropyl alcohol) is used mainly as a solvent. It has been made from propylene by reaction with sulfuric acid and water for at least the last 75 years, making its manufacture the oldest, still-running commercial organic chemical process. It is used in household rubbing alcohol because, unlike ethanol, it is unfit for human consumption even in small amounts. About 25 % of the isopropanol produced is used for making acetone, in competition with a route based on isopropylbenzene. [Pg.127]

The moist salt exploded during drying over the concentrated acid in a vacuum desiccator, (presumably owing to formation of traces of manganese heptoxide from reaction with sulfuric acid vapour). [Pg.15]

I-Cyanobenzocyclobctene, 48, 53 8-Cyanoethylhydrazine, from acrylonitrile and hydrazine, 48, 8 reaction with sulfuric acid, 48, 8 Cyanogen bromide, 45, 88 Cyahogen chloride, in preparation of chlorosulfonyl isocyanate, 46, 24 reaction with sulfur trioxide, 46, 24 7-Cvanoheptanal, 49, 27, 28... [Pg.68]

The crude C4 fraction is extracted with acetone, furfural, or other solvents to remove alkanes such as -butane, isobutane, and small amounts of pentanes, leaving only 1- and 2-butenes and isobutene. The isobutene is removed by reaction with sulfuric acid and water because it reacts more easily, being able to form a tertiary carbocation. [Pg.125]

Thermal decomposition produces ammonia and phosphoric acid reaction with sulfuric acid produces ammonium hydrogen sulfate ... [Pg.43]

Barium acetate converts to barium carbonate when heated in air at elevated temperatures. Reaction with sulfuric acid gives harium sulfate with hydrochloric acid and nitric acid, the chloride and nitrate salts are obtained after evaporation of the solutions. It undergoes double decomposition reactions with salts of several metals. For example, it forms ferrous acetate when treated with ferrous sulfate solution and mercurous acetate when mixed with mercurous nitrate solution acidified with nitric acid. It reacts with oxahc acid forming barium oxalate. [Pg.80]

Boric acid is produced from borax, colemanite, or other inorganic borates by reaction with sulfuric acid or hydrochloric acid, and cooling the solution to proper temperature ... [Pg.119]

Calcium hydroxide on heating at 580°C loses its water, forming calcium oxide (CaO). Ca(OH)2 forms calcium carbonate by absorbing CO2 from air or when CO2 is passed through a suspension in water. Reaction with sulfuric acid yields calcium sulfate dihydrate ... [Pg.168]

Reaction with sulfuric acid yields monoperoxysulfuric acid. Reactions with many alkaline earth compounds yield peroxides of alkaline earth metals ... [Pg.376]

Reaction with sulfuric acid or chlorosulfonic acid in acetic anhydride medium gives mono- and disuhstituted ferrocenesulfonic acid. [Pg.426]

Reactions with sulfuric acid, hydrochloric acid and hydriodic acid yield lead sulfate PbS04, lead chloride PbCL, and lead iodide PbU, respectively. [Pg.459]

When the solution is heated at 135°C, MnS04 is oxidized to Mn2(S04)3. Reaction with sulfuric acid in the presence of oxahc acid yields manganese(II) sulfate and carhon dioxide ... [Pg.554]

While the reaction with sulfuric acid in the presence of sodium chloride evolves chlorine ... [Pg.554]

Thus, in the presence of dilute acids, Mn02 is readily attacked by strong reducing agents. Similarly, reaction with sulfurous acid forms manganese(ll) dithionate ... [Pg.555]

Reaction with sulfuric acid forms nitrosyl sulfuric acid ... [Pg.659]

Fluorimetric Methods of Analysis 4.4.1 Reaction with Sulfuric Acid... [Pg.214]

Solidification point (53°), 3-Macter insol in ether-alcohol, 4-Ash, 5-Reaction with sulfuric acid, 6-rPrimary amines, 7-Moisture, 8-Reaction (Alkalinity), 9-Granulation. Following solubility values for DPA are given in lOOg of solvent water Q.03g at 25° methanol 57.5g at 19.5° ethanol 56.Og at 19-5° acetone 298.6g at 28° chloroform 206.3g at 28° and toluene 227.7g... [Pg.320]

C6HBC C.C C.C C.C C.C6H5 mw 250.28, yel ndls, mp li5—16°(browning), stable at RT for 13 months in the dark when placed on a hot metallic place it. decompd explosively with much soot. It shows no color reaction with sulfuric acid is more sol than tolan Sc (C6H.5C C)3 in polar solvs such as MeOH, ale Sc acetone. It was prepd by oxidative coupling of cuprous acetylide, C6HB.C C.C C.Cu, with CuCl2 (Refs)... [Pg.374]

Perfluoroquinazoline on reaction with sulfuric acid yields perfluoroquinazoline-2,4(l//,3 )-dione (12).55... [Pg.390]

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