Sulfuric acid, additive

Markovmkov s rule is obeyed because the mechanism of sulfuric acid addition to alkenes illustrated for the case of propene m Figure 6 8 is analogous to that described earlier for the electrophilic addition of hydrogen halides... 

The combination of sulfuric acid addition to propene followed by hydrolysis of the resulting isopropyl hydrogen sulfate is the major method by which over 10 lb of isopropyl alcohol is prepared each year m the United States... 

A polyester-type fluorescent resin matrix (22) is made by heating trimellitic anhydride, propylene glycol, and phthaUc anhydride with catalytic amounts of sulfuric acid. Addition of Rhodamine BDC gives a bright bluish red fluorescent pigment soluble in DME and methanol. It has a softening point of 118°C. Exceptional heat resistance and color brilliance are claimed for products of this type, which are useful for coloring plastics. 

Lead-acid batteries are produced using lead, sulfuric acid, additives such as antimony, and various other raw materials. Your facility s battery production capacity is 5,000 batleries per day, and the facility normally operates 24 hours per day, 300 days per year. 

The filtrate containing the capreomycin is added to 240 liters of methanol with stirring. The methanolic solution of capreomycin is acidified by the addition of one liter of ION sulfuric acid, whereupon the precipitation of the sulfuric acid addition salt of capreomycin commences. The mixture is permitted to stand overnight for more complete precipitation. The supernatant is removed by decanting and filtering. The precipitate, consisting of the capreomycin disulfate, is washed with 10 liters of methanol and is dried in vacuo. Yield 2,510 grams. 

To a solution of 5 g of sisomicin in 250 ml of water add 1 N sulfuric acid until the pH of the solution is adjusted to about 5. To the solution of sisomicin sulfuric acid addition salt thereby formed, add 2 ml of acetaldehyde, stir for 10 minutes, then add 0.B5 g of sodium cyanoborohydride. Continue stirring at room temperature for 15 minutes, then concentrate solution In vacuo to a volume of about 100 ml, treat the solution with a basic ion exchange resin [e.g., Amberlite IRA401S (OH )], then lyophilize to a residue comprising 1-N-ethyl-sisomicin. 

It can be seen, therefore, that ferrous iron and chalcopyrite oxidation are acid-consuming reactions, while pyrite oxidation and iron hydrolysis are acid-producing reactions. Thus, whether the overall reaction in a dump is acid producing or acid-consuming depends on the relative proportions of chalcopyrite and pyrite and on the pH conditions. In practice, sulfuric acid additions to the leach solution applied to the dump are usually required to overcome the acid consuming reactions of the gangue minerals and to keep the pH in a suitable range, typically 2 to 2.4, to optimize bacterial activity and minimize iron hydrolysis. 

Bentzinger, von R. et al., Praxis Naturwiss. Chem., 1987, 36, 37 A student was attempting to prepare anhydrous hydrogen fluoride by dehydrating aqueous 60% hydrogen fluoride solution with cone, sulfuric acid. Addition of 200 ml of sulfuric acid to 500 ml of hydrofluoric acid in a 1 1 copper flask led to... 

Addition of the 2-iodobenzoic acid to the bromate-aqueous acid mixture results in an easily controlled, smooth reaction and an easily stirred reaction mixture. The stirring rate should be regulated such that splashing is minimized and solids do not accumulate on the walls or roof of the reaction vessel. Any solids which adhere to the sides or roof of the reaction vessel above the level of the liquid should be washed back into the reaction mixture with the minimum amount of 2M sulfuric acid. Addition... 

Sodium. Aqueous hydrochloric acid reacts explosively with sodium.3 Sulfuric Acid. Addition of concentrated hydrochloric acid to concentrated sulphuric acid dehydrates the hydrochloric acid to release 250 times its volume of gas.4,5... 

Sulfuric Acid. Addition of KC103 in portions to H2S04 below 60°C and above 200°C causes brisk effervescence between these temperatures, explosions are caused by the C102 produced.18... 

Sulfuric Acid. Addition of concentrated H2S04 causes explosion of C102 generated.9 Wood. Wood in contact with the chlorate over a period of time may ignite or explode.9... 

Procedure Simply place 50 grams (1.8 oz.) of concentrated sulfuric acid into the addition funnel, and then place 60 grams (2.1 oz.) of pickling salt, into the reaction flask. Thereafter, slowly drip the concentrated sulfuric acid onto the pickling salt. During the sulfuric acid addition, hydrogen chloride gas will be steadily evolved. Once the gas has been dried, it can be used in the manufacture of anhydrous aluminum chloride, in the preparation of hydrochloride salts, and/or the preparation of anhydrous metal chlorides. 

Materials. Solvents were the best commercial grades available and were not purified further. Feist s acid was prepared by the method of Goss et al. (2). The methyl ester was prepared in the normal Fisher manner with methanol and sulfuric acid. Addition of water, ether extraction, removal of ether, and distillation yielded a colorless liquid (bp 78°-80°C at 1.5 mm Hg) which crystallized upon standing, mp 30 °C (lit. value 30°C) (8). 

Pure or alloyed lead may be employed as anode in sulfuric acid addition of 1% silver, 0.3% tin, and a little cobalt raises its resistance toward corrosion. Other metals may improve the yield of a given electrode process. Thus, addition of antimony and cadmium to a lead anode [152] is advantageous in the oxidation of o-toluenesulfonamide to o-benzoylsulfonimide (saccharin). The same effect may be obtained, however, by using an uncoated, unalloyed lead anode if Sb203 is added to the anolyte [153]. It seems possible that the dissolution of some antimony from the alloyed lead anode takes place and produces the same effect as the Sb203 in the anolyte. 

A common batch system for chromium reduction with sodium bisulfite consists of a collection tank and a reaction tank with a 4-h retention time. Sodium bisulfite solution is metered into the reaction tank and the pH is controlled by sulfuric acid addition. 

To get an idea of the adsorption capacity or adsorption strength of the different sediment samples the recovery of a methylmercury spike of 100 ppb was tested for a number of samples without adding sulfuric acid It appeared very clearly, that the adsorption power is strongly dependent on the kind of sediment considered. In the case of sample 1 for instance, almost 50% of the CH3HgCl signal is recovered without ai f sulfuric acid addition. 

Purification this step features the second innovation of the process which, to eliminate the by-product acrolein, favors the formation of cyanohydrin by means of the hydrogen cyanide which is also present This operation takes place at low temperature (20 Q in agitated reactors, either continuously in the presence of a copper-based catalyst, or semi-continuously with a reaction phase in basic medium (caustic soda addition), followed by a neutralization period (sulfuric acid addition). The cyanohydrin obtained is then removed by vacuum distillation. The withdrawal may be sent to a thin layer evaporator to recover entrained acrylonitrile. These treatments must be conducted in the presence of a polymerization inhibitor and at a temperature below 55 C to prevent the rede-composition of cyanohydrin.... .. ... 

Sample Preparation. The procedure described by Milner et al. (12), based on wet ashing with sulfuric acid and incineration in a Vycor dish, was adopted without modification for the decomposition of middle and heavy distillates. For light distillates (i.e., gasolines) the decomposition time was shortened considerably by evaporating the sample in a stream of nitrogen after the sulfuric acid addition but before the incineration. 

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