Showing papers on "Sodium sulfide published in 1978"

Physiological and morphological observations on Thiovulum sp.

Abstract: Cell suspensions of Thiovulum sp., collected from enrichment cultures, were grown, maintained, and harvested for periods up to 7 months. In open-flow cultures run with aerated seawater, a continuous supply of hydrogen sulfide was provided by diffusion through a semipermeable membrane from either a live culture of Desulfovibrio esturaii, neutralized sodium sulfide, or a N2-H2S gas mixture. Attempts to grow Thiovulum in pure culture failed despite variation in concentrations of dissolved oxygen and hydrogen sulfide in stratified as well as in completely mixed systems. Uptake of 14CO2 and some organic compounds by purified cell suspensions was measured, and values were corrected for the activity of heterotrophic as well as autotrophic contaminants as determined in control experiments. Cell populations exhibited maximum uptake activities during formation of the characteristic veils. Substantial uptake of CO2 in air-saturated seawater was coincident with an optimal concentration of hydrogen sulfide of about 1 mM. Glutamate and a selection of vitamins (B12M biotin, and thiamine) did not significantly affect the uptake of CO2. No substantial uptake of carbon from acetate, glutamate, mannitol, and Casamino Acids was found. Within the range of error indicated, the data are consistent with acceptance of a chemolithotrophic nature of Thiovulum. Images

Lubricant composition containing sulfurized olefin extreme pressure additive

Abstract: An additive for improving extreme pressure properties of lubricating oil is made by reacting sulfur monochloride with a monoolefin (e.g. isobutene) in the presence of a promoter amount of a lower alkanol (e.g. methanol) to form an adduct, reacting the adduct with sulfur and sodium sulfide in an aqueous alkanol made at a ratio of 0.1-0.4 gram atom of sulfur per gram mole of sodium sulfide and then recovering the reaction product.

Oxygen trapping composition

Abstract: PURPOSE: To provide an oxygen absorbent having no sulfureous odor with expanded the range of applications by incorporating deodorant, e.g. alkali metal sulfides, silica. CONSTITUTION: A composition consists of alkali metal sulfide such as sodium sulfide as a composition which absorbs oxygen and generates heat, one or more selected from the group consisting of silica, alumina, and an adsorbent such as active carbon capable of adsorbing sulfur compounds physically in amount of 10wt% or less basing on the amount of to the metallic sulfide. The composition eliminates odor originated from sulfur and provides an economical oxygen absorbent having wide applications in medical and food industry field. COPYRIGHT: (C)1980,JPO&Japio

Existence and stability of a simple sulfide of iron(III)

Abstract: Iron(III) sulfide was prepared in an amorphous form by treating stoichiometric quantities of iron(III) with aqueous sodium sulfide at 0/sup 0/C or lower. Examination of the material with a scanning electron microscope equipped with an energy dependent x-ray spectrometer confirmed that sodium and chloride were not present, and that the atomic ratio of Fe : S is 1 : 1.5. Empirically, the material prepared is Fe/sub 2/S/sub 3/. The Moessbauer spectrum at 78/sup 0/K is different from that of any of the known iron sulfides or compounds such as NaFeS/sub 2/. The spectrum was analyzed using a nonlinear least-square fitting program assuming Lorentzian line shapes. The results indicate that there are two different environments for the iron ions in the compound, both with a symmetry lower than cubic. The observed center shift is consistent with iron(III) or low spin iron(II). In order to characterize fully the charge state of the iron ion, Moessbauer measurements were carried out at 4.2/sup 0/K. A six-line pattern with relatively broad line widths was obtained. The hyperfine magnetic field at the /sup 57/Fe nucleus is 253 +- 6 kOe. The presence of a magnetic splitting at 4.2/sup 0/K completely excludes the presence of iron(II), confirmingmore » the formation of the compound as a sulfide or iron(III). The infrared spectrum of iron(III) sulfide exhibits bands at 795 (sh), 485 (br), and 390 and 320 cm/sup -1/. The spectrum appears to be clearly different from that of FeS/sub 2/ and other iron sulfide minerals.« less

Pulmonary Excretion of Hydrogen Sulfide, Methanethiol, Dimethyl Sulfide and Dimethyl Disulfide in Mice

Abstract: Neither hydrogen sulfide nor any other volatile sulfur metabolites were found in the expired breath of mice given sodium sulfide intraperitoneally in doses up to the LD50. The detection system was sensitive to less than 0.1% of the sulfur in the given dose. The intraperitoneal administration of dimethyl disulfide resulted in its appearance in the expired breath of mice as well as much smaller amounts of both methanethiol and dimethyl sulfide. The intraperitoneal administration of methanethiol resulted in its pulmonary excretion as well as that of dimethyl sulfide. Administration of dimethyl sulfide led to its appearance alone in expired breath. Mice pretreated with ammonium acetate and then injected with dimethyl disulfide excreted the same three compounds via the lungs as above, but there were complex changes in the proportions and in the time sequence of their appearance. The absolute amounts of all three were increased, and the peak excretion for each was delayed. The amount excreted as dimethy...

Preparation of keratin hydrolyzate

Abstract: PURPOSE: To obtain a keratin hydrolyzate, useful as a cold waving agent for hair, and having a specific average molecular weight and a mercapto group, by reducing keratin with a mercaptan or a sulfide in an alkaline region, and hydrolyzing the reduction product with an enzyme. CONSTITUTION: Keratin is reduced with a mercaptan, e.g. mercaptoethanol, or a sulfide, e.g. sodium sulfide, in an alkaline region, preferably pH8W11. The reduction product thus obtained is then hydrolyzed with an acidic proteolytic enzyme, e.g. pepsin, or a neutral proteolytic enzyme, e.g. bromelin, to give a keratin hydrolyzate having an average molecular weight <2,000 and a mercapto group. The hydrolyzate maintains the excellent waving effect and setting effect for a long time without doing damage to hair because of the chemical structure and peptide linkage similar to those of the hair. Therefore, the hydrolyzate is useful as the cold waving agent and a setting COPYRIGHT: (C)1981,JPO&Japio

A new approach to the synthesis of thiophenophanes. Synthesis of [n.1.1]paracyclo(2,5)thiophenoparacyclophanes.

Abstract: A new method for the synthesis of thiophenophanes which consists of cyclization of bischloroacetyl compounds with sodium sulfide and condensation of the resulting keto sulfides with glyoxal was developed. As an application a series of [n.1.1]paracyclo(2,5)thiophenoparacyclophanes (n=3,4,5,6,7,8,10) were synthesized.

Prevention of corrosion in hydrodesulfurizer air coolers and condensers.

Abstract: In a laboratory test conducted at 93/sup 0/C in an oxygen-free environment, carbon steel and Type 316 stainless steel exposed to aqueous ammonium bisulfide (AB) solutions were severely corroded at > 35% AB, whereas Incoloy 800, titanium, and aluminum were resistant at up to 45% AB. Oxygen and sodium sulfide increased the corrosion rate of carbon steel but inhibited the corrosion of Type 316 steel. These results suggested that at < 35% AB, the corrosion was due to hydrogen sulfide attack, whereas at higher AB concentrations, it involved the formation of iron-ammonium complexes which destroyed the protective surface scales. The available field experience on corrosion in hydrosulfurizers by AB (formed from streams rich in hydrogen sulfide and ammonia) showed that stream velocities and the solution pH should be controlled at < 9 m/sec and 8.3-8.9, respectively, and that air cooler design should ensure balanced flow to minimize the corrosion. Water injection can be used effectively if the AB concentration is below 35%. Continuous water injection cannot be used, however, with feedstocks such as naphthas, which contain insufficient nitrogen to produce an 8.3-9.0 pH buffered draw-water at the separator. Tables and graphs.

Method for oxidizing malodorous sulfur compounds in kraft cooking liquor

Abstract: A method for oxidizing and removing remaining sodium sulfide as well as generated sulfur compounds by introducing oxygen into cooking liquor at high temperature and high pressure in the end stage of kraft cooking.

Method of treating chromiummcontaining powdery substance

Abstract: PURPOSE:To provide the subject method comprsing, in treating a powdery substance containing chromium (VI) with sodium sulfide or the like while preventing elution of sodium sulfide or the like added in excess using a water-soluble iron salt at the same time, a water-soluble ferric iron salt is used as the above described iron salt, thereby making it possible to treat the powdery substance in the acidic region.

Production of flake like material

Abstract: PURPOSE:To cool in specific water-contg. conditions a concentrated aq. solution contg. multicomponent inorganic sodium salt mainly composed of sodium sulfide etc. discahrged from pulmmills, and to convert it to easily-handling flake like material without change in its composition.

Preparation of dibenzyltrithiocarbonate

Abstract: PURPOSE:To prepare the title cpd., useful as lubricant additives and agrichemicals, by reaction of a specific aq. soln. of sodium sulfide with carbon disulfide, followed by reaction with benzyl chloride.

Condensation product from phenothiazine and p-nitrosophenol, process for the production of the condensation product, process for the production of sulfur dyestuffs using the condensation product and the sulfur dyestuffs prepared therewith

Abstract: Green sulfur dyestuff is produced by reacting phenothiazine in sulfuric acid with an oxidizing agent, condensing the oxidized phenothiazine with p-nitrosophenol and thionating with sulfur and sodium sulfide the condensate in a bake or reflux process.

Process for the preparation of 1-amino-4-bromoanthraquinone-2-sulfonic acid II

Abstract: A process for the preparation of 1-amino-4-bromoanthraquinone-2-sulfonic acid or an alkali metal salt thereof by converting 1-aminoanthraquinone (which can be obtained by reduction of 1-nitroanthraquinone with sodium sulfide and/or sodium bisulfide or reaction of the 1-nitroanthraquinone with ammonia) by contacting the same with oleum at a temperature in the range of 90° to 150° C. optionally in the presence of an alkali metal sulfate and thereafter treating the so-sulfonated composition with bromine at a temperature in the range of from 60° to 100° C. 1-amino-4-bromoanthraquinone-2-sulfonic acid or an alkali metal salt thereof can be precipitated from the reaction mixture either by adjusting the sulfuric acid concentration thereof to 60 to 85 percent by weight or by stirring the reaction mixture into water, which optionally contains an alkali metal sulfate.

Treating method for sulfiding solution

Abstract: PURPOSE:To enalbe to recover hydrogen sulfide and to extract sodium in a useful form, by treating the sulfiding solution containing sodium sulfide, etc. using the specified ion exchange resin.

Concentrating method of aqueous sodium sulfide solution

Abstract: PURPOSE:To concentrate an aq. sodium sulfide soln. without forming any scaling, to carry out a continuous operation, by supplying a soln. with a concn. of more than 45%, when an aq. sodium sulfide soln. is concentrated using a centrifugal thin film evaporator.