Sulfur compounds formed from effect

Organic acids, including carbon dioxide, lower the wort pH during fermentation. The principal acids formed are lactic, pymvic citric, malic, and acetic acids, at concentrations ranging from 100—200 ppm. The main sulfur compounds formed during fermentation and thek perception thresholds are as follows H2S (5—10 ppb) ethanethiol (5—10 ppb) dimethyl sulfoxide (35—60 ppb) and diethyl sulfide (3—30 ppb). At low levels, these may have a deskable flavor effect at higher levels they are extremely undeskable. Sulfur dioxide also forms during fermentation, at concentrations of 5—50 ppm its presence can be tasted at levels above 50 ppm. 

The corrosion of metals by non oxidising acids occurs when the metal is able to displace hydrogen ions from the solution. The corrosion effects that arise in the petroleum refining industry are connected with the presence of corrosive sulfur compounds formed by... 

The moist sulfide readily oxidises in air exothermally, and may reach incandescence. Grinding in a mortar hastens this [1]. The impure sulfide formed when steel processing equipment is used with materials containing hydrogen sulfide or volatile sulfur compounds is pyrophoric, and has caused many fires and explosions when such equipment is opened without effective purging. Various methods of purging are discussed [2], Formation of pyrophoric FeS in bitumen tanks is considered as a cause of spontaneous ignition and explosion in the head space [3], A detailed study of formation of possibly pyrophoric sulphides from rust in crude oil tankers has been made [4],... 

In a demonstration of the corrosive effect of fuming nitric acid on rubber tubing, soon after the initial vigorous reaction had subsided, a small explosion followed by ignition occurred. (The sulfur compounds used to compound the rubber were probably involved) [1], Leaded neoprene rubber gloves, (the lead present as red lead, Pb304) used in the nuclear industry, may form explosive compounds in contact with nitric acid. It is hypothesised this could be lead fulminate formation. Since mixtures of lead nitrate with organics, or with sulfur from vulcanisers, would be explosive, this seems unduly complicated [2]... 

If indeed S02 and S03 are effective in reducing the superequilibrium concentration of radicals in flames, sulfur compounds must play a role in NO formation from atmospheric nitrogen in flame systems. Since S02 and S03 form no matter what type of sulfur compound is added to combustion systems, these species should reduce the oxygen atom concentration and hence should inhibit NO formation. Wendt and Ekmann [46] have reported flame data that appear to substantiate this conclusion. 

Long-term poisoning of the NOx storage components by sulfur and phosphorus contained in fuel and lubricants leads to gradual decrease of the effective NOx adsorption capacity. The sulfates formed on the NOx storage sites are more stable than the nitrates, and special de-sulfurization techniques need to be applied from time to time to keep the NSRC effectiveness on a reasonable level (cf., e.g., Dieselnet, 2007). The NSRC poisoning by different sulfur compounds (S02, H2S and COS) was examined by Amberntsson et al. (2002). 

The organic compounds formed (e.g. thiolanes) may be unstable to pyrolysis and will release the isotopically heavy H20 which will mix with H2S released from the kerogen. The total sulfur isotope effects measure were very small, resulting in a total measured ... 

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