Sulphur, use

Obtain a rough estimate of the cost of a plant to produce 750 tonnes per day of sulphuric acid, from sulphur. Use the costs given by Garrett (1989) reproduced in Figure 6.2. 

The chemistry involved in this explosively unstable system is reviewed [1]. The mechanism of the trigger reactions that initiate the exothermic decomposition of chlorate-sulfur mixtures has been studied. Mixtures containing 1-30% of sulfur can decompose well below the m.p. of sulfur, and addition of sulfur dioxide, the suspected chemical trigger, causes immediate onset of the reaction [2], Autoignition of stoichiometric mixtures can be as low as 115°C, with frictional sensitivity at 5N, the lowest load the test apparatus permitted. Both were dependent upon the history of the sulphur used [3],... 

A magnesium carbonate coated grade of sulphur used in curing nitrile mbber. 

The reaction product was identified as a-sulphur using XRD and SEM analysis. Sanchez and Hiskey (1991) reinvestigated the oxidation reaction of arsenopyrite and a two-step reaction sequence was suggested by the electrochemical measurements. The initial step was described by... 

Table I Indicates a comparison of synthetic crude yields and product sulphur using various processing schemes. Should synthetic crude production rise to 500,000 barrels/day from the Athabasca region in the Nineties, by-product sulphur could exceed...

Table 3 Plasma treatment conditions for sulphur using various monomers...

For the manufacture of blackpowder the sulphur used should be of highest purity, refined by distillation. Crude sulphur (which usually contains 2-5% of impurities) is distilled from retorts heated to a temperature of400°C. The receiver should be maintained at a temperature above 115°C (120-130°C), i.e. above the melting point of sulphur (114-115°C). Under these conditions the distillate condenses to a liquid which is then cast into sticks or blocks. This is the only form of sulphur suitable for the manufacture of blackpowder. If the receiver temperature is lower, the sulphur distilled from the retort condenses as flowers of sulphur which always contain a little S02) and even traces of H2S04 (the substance is easily oxidized due to its large surface area). Sulphur in this form is therefore slightly hygroscopic and acidic, and is unsuitable for the manufacture of blackpowder. 

Mr. Gossage surmounted the pentethlonic acid difficulty, by causmg the reaction to take place at a high temperature. H1b process is peculiarly applicable to the reproduction of the sulphur contained in the lime compound or alkali waste thrown away by the soda manufacturers. As is web known the whole of the sulphur used in the manufacture of the alkali finds... 

In spite of a high proportion of sulphur used, blooming does not occur in fully cured ebonite vulcanizates. 

Low sulphur stocks have better ageing resistance. Normally the oxidation rate increases with the amount of sulphur used in the cure. The increased rate may be due to the activation of adjacent C-H groups by high levels of combined sulphur. Saturated sulphides are inert to oxidation. 

Products Derived from the Sulphur Used in Vine Treatment... 

Wadleigh M. A. and Blake D. M. (1999) Tracing sources of atmospheric sulphur using epiphytic lichens. Environ. Pollut. 106, 265 - 271. 

Atomic weight 32 06. There are two or three allotropes The sulphur used at ordinary temperature and pressure is OL, which has yellowish rhombic crystals and has a specific gravity of 2 07 sulphur makes a... 

Prectoltated sulphur 43S1 A milk of sulphur, used In treating skin affections and as a mild laxative. 

Sulphur. - Useful reviews that have appeared this year include a... 

The properties of the vulcanized product vary with the amount of sulphur used. In the preparation of rubber for most purposes from 5 to 7 per cent of the weight of the rubber is used. In making ebonite, or hard rubber, up to 30 per cent is employed. It is probable that in vulcanization a part of the sulphur unites chemically with the rubber and a part is held by physical adsorption. The exact nature of the process is not yet understood. 

Nitrating Acid Mixture. Mixture of nitric and sulphuric used for the nitration of glucose, cellulose or other organic substances. This acid mixture coming in contact with organic matter commonly causes fire, unless the mixture contains much water. lATA App. A... 

Figure 10.46 represents the Raman spectra of sulphur calculated by Fourier transformation of the interferogram of the file SULPHUR using no apodization (boxcar) and the apodization fiuiction Norton-Beer weak, respectively, a zerofilling factor of 2, and the power spectrum for the phase correction. See if you obtain the same spectra. 

ELECTROWINNING OF LEAD BATTERY PASTE WITH THE PRODUCTION OF LEAD AND ELEMENTAL SULPHUR USING BIOPROCESS TECHNOLOGIES... 

The level of impurities in the sulphur used in sulphonation operations should normally not exceed 0.5% and a target minimum sulphur content of 99.7% is preferred. The types of impurity and their effect on sulphonation operations are summarised below. Generally, sulphur analysis is performed very infrequently but in cases where new suppliers appear or processing problems occur, it is advisable to have the sulphur quality checked to ensure that die specification is being met. Because of the low specified levels of some of the impurities, the expertise available in specialised laboratories should be employed for this analysis. 

Follow steps 1-3 of the method for sulphur, using a nickel crucible and a sample containing 0.03-0.04 g phosphorus. 

Olper, M, Maccagni, M, Buisman, C J N and Schultz, C E, 2000. Electrowinning of lead battery paste with the production of lead and elemental sulphur using bioprocess technologies, in Proceedings Lead-Zinc Symposium, pp 803-813 (The Minerals, Metals and Materials Society (TMS) Warrendale). 

If CS2 and cyanolysis are used with subsequent reaction with iron(///), the S concentration is determined from a standard additions curve (at 460 nm) by adding different amounts of sulphur using different volumes of the standard solution (Section 6.3.2.3). For procedure see Section 6.3.4. 

Production by Use of Concentrated Oleum (65 %) and Solid Sulphur Using Compression and Refrigeration (Batch Process)... 

The new radical is less sterically impeded thus facilitating coupling but the situation is made complicated by the fact that similar reactions occur at the site of the P - and P" radicals and by the fact that the new radicals can also be the precursor of scission reactions (which would not have otherwise occurred with the P and P"-radicals). For this reason the optimum amount of sulphur used is critical and varies from one polymer to another according to the ethylene propylene ratio. 

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