Sulfur dioxide description

Descriptions of field studies of power-plant stack plumes were given by Davis et al. The ozone concentration appears to be lower in regions of high sulfur dioxide content. At 32 km downwind from the stacks, it was claimed that the ozone concentration in the plume (now 11 km wide) is higher than the ambient concentration ( 0.08 ppm) by approximately 0.02 ppm. Simultaneous measurements of nitric oxide and nitrogen dioxide were integrated across the plume. Values of the ratio of nitric... 

Description Sulfur dioxide (S02) is a gas resulting from the combustion of coal, mainly in power plants, and certain types of liquid fuels that contain sulfur. In addition, it is produced during the manufacture of paper and smelting of metals. It may cause respiratory problems and permanent damage to the lungs when inhaled at high levels. It plays a major role in the production of acid rain (EPA site). Carbon disulfide (CS2) has many industrial... 

A plant is to manufacture butadiene sulfone at the rate of 1250 lb/hr from liquid sulfur dioxide and butadiene to be recovered from a crude C4 mixture as starting materials. Construct a flowsheet for the process according to the following description. 

There continue to be many absorbers for the removal of water-soluble gases. Acid gases and some volatile organic compounds can be absorbed readily in water by the types of equipment previously discussed. These processes are essentially absorption with chemical reaction. For a discussion of absorption in air pollution control and a description of several absorption systems for sulfur dioxide and nitrogen oxide removal, see Schnelle and Brown. A more detailed discussion of many more processes for flue gas desulfurization employing absorption is given by Lunt and Cunic. ... 

Kawaguchi and coworkers at Teijin have prepared a series of polymers based on poly(diallyl amine), its copolymer with sulfur dioxide, and various terpolymers.39 The chemistry of this polymer synthesis is shown below. The patent description shows the diallylamine polymers to be polypiperidine (six-membered ring) derivatives, but there are a number of publications that show this monomer to produce preferably polypyrrolidine (five-membered ring) structures ... 

A brief description of a typical copper smelter operation will help in understanding the extremely variable nature of the sulfur dioxide gas stream to be processed. The copper concentrates delivered to the smelter are a mixture of copper and iron sulfides. In current practice these are processed in two or three steps to produce 99% blister copper. In some smelters the concentrates are first partially roasted, removing 20-50% of the sulfur. This produces a relatively strong, steady gas stream containing 4-14% sulfur dioxide, depending on the type of roaster used. 

Physical Description Brown crystals with a slight, sulfur dioxide odor, [insecticide] [Note Technical product is a tan, waxy, isomer mixture.] ... 

Physicai Description White crystals or powder with a slight odor of sulfur dioxide. 

Physicai Description Colorless liquid or gas (above 84 F) with an odor like sulfur dioxide. 

Physicai Description Colorless to yellow to reddish liquid with a puhgent odor like sulfur dioxide. [Note Fumes form when exposed to moist air.] ... 

In the context of a food additive, sulfur dioxide refers to a mixture of oxospecies of sulfur in an oxidation state of (h-4), i.e., SO2, HSOJ, SO3, S2O5. Sulfite and hydrogen sulfite ions are formed by the ionization of the species H2SO3, which is more correctly written as SO2 H2O. In practice it is very difficult to provide a quantitative description of these ionic and nonionic forms in foods. To avoid ambiguity the term S(1V) is used to describe the mixture of sulfur species when it is not necessary or possible to identify the detailed composition. 

Write the chemical formula for each substance mentioned in the following word descriptions (use the front inside cover to find the symbols for the elements you don t know), (a) Zinc carbonate can be heated to form zinc oxide and carbon dioxide. (b) On treatment with hydrofluoric acid, silicon dioxide forms silicon tetrafluoride and water, (c) Sulfur dioxide reacts with water to form sulfurous acid, (d) The substance phosphorus trihydride, commonly called phosphine, is a toxic gas. 

The SO3 gas, directly produced from the combustion of elonental sulfur and subsequent oxidation of the formed sulfur dioxide (SOj) with dry air to yield sulfur trioxide (SO3), is nowadays the most widely used sulfonating agent, therefore, it deserves a deeper description. 

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