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Sulfur dioxide acid manufacturing

Sulfur dioxide Acid manufacture, sulfide ore roasting, plant frimigation, power generation (coal or oil), black shale oxidation in iron ore mines... [Pg.310]

In view of the concern about air quality, the recovery and disposal of sulfur dioxide has been the subject of many investigations, though none has yet been really successful (see Table 7.8). It should be mentioned that the options giving rise to highly concentrated sulfur dioxide suitable for liquefaction, or a gas stream sufficiently rich in sulfur dioxide to manufacture sulfuric acid, presuppose the existence of available markets for either liquid sulfur dioxide or sulfuric acid. [Pg.770]

In some cases a catalyst consists of minute particles of an active material dispersed over a less active substance called a support. The active material is frequently a pure metal or metal alloy. Such catalysts are called supported catalysts, as distinguished from unsupported catalysts, whose active ingredients are major amounts of other substances called promoters, which increase the activity. Examples of supported catalysts are the automobile-muffler catalysts mentioned above, the platinum-on-alumina catalyst used in petroleum reforming, and the vanadium pentoxide on silica used to oxidize sulfur dioxide in manufacturing sulfuric acid. On the other hand, the platinum gauze for ammonia oxidation, the promoted iron for ammonia synthesis, and the silica-alumina dehydrogenation catalyst used in butadiene manufacture typify unsupported catalysts. [Pg.585]

Sulfur dioxide is manufactured on a large scale by burning sulfur (the most important process) or H2S, by roasting sulfide ores (e.g. equation 15.81), or reducing CaS04 (equation 15.82). Desulfurization processes to limit SO2 emissions (see Box 11.2) and reduce acid rain (see Box 15.5) are now in use. In the laboratory, SO2 may be prepared by, for... [Pg.453]

Manufacture of 3-hydroxy-4-amino-l-naphthalenesulfonic acid involves the nitrosation of 2-naphthalenol, bisulfite addition, and reduction of the nitroso to the amino group by sulfur dioxide generated in situ (47). 3-Hydroxy-4-amino-l-naphthalenesulfonic acid is obtained in 80% yield. [Pg.500]

Nickel sulfate also is made by the reaction of black nickel oxide and hot dilute sulfuric acid, or of dilute sulfuric acid and nickel carbonate. The reaction of nickel oxide and sulfuric acid has been studied and a reaction induction temperature of 49°C deterrnined (39). High purity nickel sulfate is made from the reaction of nickel carbonyl, sulfur dioxide, and oxygen in the gas phase at 100°C (40). Another method for the continuous manufacture of nickel sulfate is the gas-phase reaction of nickel carbonyl and nitric acid, recovering the soHd product in sulfuric acid, and continuously removing the soHd nickel sulfate from the acid mixture (41). In this last method, nickel carbonyl and sulfuric acid are fed into a closed-loop reactor. Nickel sulfate and carbon monoxide are produced the CO is thus recycled to form nickel carbonyl. [Pg.10]

Sulfuric acid is the most important sulfur-containing intermediate product. More than 85% of the sulfur consumed in the world is either converted to sulfuric acid or produced direcdy as such (see Sulfuric acid and sulfur trioxide). Worldwide, well over half of the sulfuric acid is used in the manufacture of phosphatic fertilizers and ammonium sulfate for fertilizers. The sulfur source may be voluntary elemental, such as from the Frasch process recovered elemental from natural gas or petroleum or sulfur dioxide from smelter operations. [Pg.125]

Paper Products. Paper (qv) products account for about 2% of sulfur demand. The largest single segment of demand is in the manufacture of wood pulp by the sulfite process (see Pulp). In this process, the main sulfur intermediate is sulfur dioxide, which is generally produced at the plant site by burning elemental sulfur. Some sulfur dioxide, however, is produced as a by-product at smelter operations, purified andUquefied, and shipped to the pulp mills. The sulfur dioxide is converted to sulfurous acid, and the salt of this acid is a principal component of the cooking Hquor for the sulfite process. [Pg.125]

Oxidation of sulfur dioxide in aqueous solution, as in clouds, can be catalyzed synergistically by iron and manganese (225). Ammonia can be used to scmb sulfur dioxide from gas streams in the presence of air. The product is largely ammonium sulfate formed by oxidation in the absence of any catalyst (226). The oxidation of SO2 catalyzed by nitrogen oxides was important in the eady processes for manufacture of sulfuric acid (qv). Sulfur dioxide reacts with chlorine or bromine forming sulfuryl chloride or bromide [507-16 ]. [Pg.144]

Commercial manufacture of methyl bromide is generally based on the reaction of hydrogen bromide with methanol. For laboratory preparation, the addition of sulfuric acid to sodium bromide and methanol has been used (80). Another method involves the treatment of bromine with a reducing agent, such as phosphoms or sulfur dioxide, to generate hydrogen bromide (81). [Pg.294]

Catalytic Sulfur Dioxide Oxidation, Sulfuric acid [7664-93-9] is the largest volume chemical manufactured woddwide and is produced by... [Pg.202]

Sulfur Dioxide, Spray Towers Flue gases and offgases from sulfuric acid plants contain less than 0.5 percent SO9 smelter gases like those from ore processing plants may contain 8 percent. The high-concentration streams are suitable for the manufacture of sulfuric acid. The low concentrations usually are regarded as contaminants to be destroyed or recovered as elemental siilfur by, for example, the Claus process. [Pg.2110]

The cellulose fiber in paper is attacked and weakened by sulfur dioxide. Paper made before about 1750 is not significantly affected by sulfur dioxide (11). At about that time, the manufacture of paper changed to a chemical treatment process that broke down the wood fiber more rapidly. It is thought that this process introduces trace quantities of metals, which catalyze the conversion of sulfur dioxide to sulfuric add. Sulfuric acid causes the paper to become brittle and more subject to cracking and tearing. New papers have become available to minimize the interaction with SO2. [Pg.132]

Phosphate fertilizer complexes often have sulfuric and phosphoric acid production facilities. Sulfuric acid is produced by burning molten sulfur in air to produce sulfur dioxide, which is then catalytically converted to sulfur trioxide for absorption in oleum. Sulfur dioxide can also be produced by roasting pyrite ore. Phosphoric acid is manufactured by adding sulfuric acid to phosphate rock. The... [Pg.68]

Sulfuric acid is, by far, the most widely manufactured chemical. Burning sulfur, in air produces sulfur dioxide, which, when combined with water, gives sulfurous acid. Combining the dioxide with oxygen forms the trioxide which, when combined with water forms sulfuric acid. When this process take place in a chamber, it is called the chamber process. [Pg.263]

One step in the manufacture of sulfuric acid is to burn sulfur (formula, Sa) in air to form a colorless gas with a choking odor. The name of the gas is sulfur dioxide and it has the molecular formula S02. On the basis of this information ... [Pg.45]

The calcium bisulfite acid used in the manufacture of sulfite cellulose is the product of reaction between gaseous sulfur dioxide, liquid water, and limestone. The reaction is normally carried out in trickle-bed reactors by the so-called Jenssen tower operation (E3). The use of gas-liquid fluidized beds has been suggested for this purpose (V7). The process is an example of a noncatalytic process involving three phases. [Pg.76]

Two successive stages in the industrial manufacture of sulfuric acid are the combustion of sulfur and the oxidation of sulfur dioxide to sulfur trioxide. From the standard reaction enthalpies... [Pg.381]

Example 4.5 Suppose the recycle reactor in Figure 4.2 is used to evaluate a catalyst for the manufacture of sulfuric acid. The catal5Tic step is the gas-phase oxidation of sulfur dioxide ... [Pg.128]

In the manufacture of sulfuric acid, a mixture of sulfur dioxide and air is passed over a series of catalyst beds, and sulfur trioxide is produced according to the reaction ... [Pg.119]

Oxidation of sulfur dioxide so2 - - o2 V205 or Pt S03 used in manufacture of oleum and sulfuric acid... [Pg.167]

Sulfur dioxide is an economically important gas that is used as a refrigerant, disinfectant, and reducing atmosphere for preserving food. Although it is also used in the manufacture of many other sulfur compounds, the most important use of S02 is as a precursor in producing sulfuric acid. It can be obtained by burning sulfur, but it is also produced in numerous other reactions. Sulfites react with acids by liberating so2. [Pg.529]

Holst A batch process for making chlorine dioxide by reducing sodium chlorate with sulfur dioxide in the presence of sulfuric acid. The sodium hydrogen sulfate byproduct can be used in the Kraft papermaking process. Developed by Moch Domsjo in Sweden, in 1946. Partridge, H. de V., in Chlorine, Its Manufacture, Properties, and Uses, Sconce, J. S., Ed., Reinhold Publishing, New York, 1962, 275. [Pg.131]

Longmaid-Henderson A process for recovering copper from the residue from the roasting of pyrites to produce sulfur dioxide for the manufacture of sulfuric acid. The residue was roasted with sodium chloride at 500 to 600°C the evolved sulfur oxides and hydrochloric acid were scrubbed in water and the resulting solution was used to leach the copper from the solid residue. Copper was recovered from the leachate by adding scrap iron. The process became obsolete with the general adoption of elemental sulfur as the feedstock for sulfuric acid manufacture. [Pg.166]


See other pages where Sulfur dioxide acid manufacturing is mentioned: [Pg.496]    [Pg.389]    [Pg.526]    [Pg.511]    [Pg.144]    [Pg.145]    [Pg.147]    [Pg.193]    [Pg.295]    [Pg.291]    [Pg.161]    [Pg.139]    [Pg.132]    [Pg.273]    [Pg.252]    [Pg.263]    [Pg.465]    [Pg.5]    [Pg.13]    [Pg.206]    [Pg.96]    [Pg.47]    [Pg.71]   
See also in sourсe #XX -- [ Pg.83 ]




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