Showing papers on "Sodium sulfide published in 1977"

Amorphous ferrous sulfide as a reducing agent for culture of anaerobes.

Abstract: Amorphous ferrous sulfide, prepared by reacting ferrous ammonium sulfate and sodium sulfide, is an excellent reducing agent for the culture of anaerobes. It reduces resazurin and reacts much more rapidly with O2 than does either soluble sulfide (HS)- or cysteine. One of the end products of the oxidation of ferrous sulfide with O2 is red and serves as an indicator for the oxygen contamination of a culture medium. Amorphous ferrous sulfide served as a suitable reducing agent for the growth of species of Methanobacterium or Clostridium. Its use is recommended for enrichment or culture of anaerobes (e.g. autotrophs, fermentative organisms) from sediments and other habitats were organic reducing agents are undesirable and where soluble sulfide might be toxic.

Hydroconversion of residua with potassium sulfide

Abstract: A process for the simultaneous desulfurization and hydroconversion of heavy carbonaceous feeds, including various sulfur-containing heavy petroleum oils, is disclosed. These feedstocks are contacted with potassium sulfide in a conversion zone maintained at elevated temperatures and in the presence of added hydrogen. In this manner, the feeds are substantially desulfurized, and significant upgrading of these feeds is also obtained as demonstrated by decreased Conradson carbon, increased API gravity, and the conversion of substantial portion of the 1,050° F.+ portion of these feeds. In a preferred embodiment, such a process is disclosed employing a combination of potassium sulfide and sodium sulfide, and in particular these processes include procedures for the regeneration of the sulfides and their recycle to the conversion zone.

Sodium sulfide pulping with hydrogen sulfide generation

Abstract: A process for pulping hardwood to produce cellulose pulp in good yield and of high quality, with a low requirement for causticized pulping liquor, which comprises in a first pulping stage pulping the hardwood in an alkaline pulping liquor containing sodium sulfide at a pH of about 10.5 to about 13 and at a temperature within the range from about 110° to about 170° C while generating hydrogen sulfide in situ by reaction of sodium sulfide with organic acids liberated in the pulping; and then in a second pulping stage, following directly after the first pulping stage, continuing the pulping at a pH higher than said first stage pH, within the range of about 12.5 to about 14 and at a temperature higher than said first stage temperature within the range from about 145° to about 190° C, in the presence of added alkaline pulping liquor comprising sodium hydroxide and sodium sulfide until cellulose pulp is produced.

Process for production of sodium thiosulfate and sodium hydroxide

Abstract: Sodium sulfide or sodium hydrosulfide is oxidized to form sodium polysulfide and sodium hydroxide which may be further oxidized to sodium thiosulfate and sodium hydroxide. The oxidant is air, oxygen or oxygen in mixture with other gases, the reductant is aqueous sodium sulfide or sodium hydrosulfide and the reaction is carried out with both reactants in non-flooded contact with a solid catalyst material, of which a typical example is a particulate carbon treated with polytetrafluoroethylene (PTFE). The reaction is typically conducted at atmospheric pressure and without the application of heat, with the oxidant and the reductant being in interfacial contact with each other, but only, insofar as possible, at sites where both are simultaneously in contact with a catalyst which is prevented from being flooded by either the oxidant or reductant.

Treating method for powdery substance containing chromium

Abstract: PURPOSE: To reduce hexavalent chromium to trivalent chromium simply, rapidly and, furthermore, economically, and thus to perform the treatment for preventing the environmental pollution, by adding sodium sulfide or sodium hydrogensulfide and a water-soluble ferrous salt to the powdery substance containing hexavalent chromium and kneading the mixture in the wet condition. COPYRIGHT: (C)1978,JPO&Japio

Reduction of sodium sulfate to sodium sulfide

Abstract: Methods and apparatus pertaining to reduction of sodium sulfate to sodium sulfide include the feeding of sodium sulfate into a combustion chamber in which the sodium sulfate is exposed to a reducing atmosphere while at the same time being exposed also to a temperature above the melting point of sodium sulfide. Thus, a liquid accumulates at the bottom of the combustion chamber and this liquid will of course contain a considerable amount of sodium sulfide reduced from the sodium sulfate. The exhaust gases of the combustion chamber are utilized in a steam generator the exhaust gases of which may in turn be returned to the combustion chamber where these exhaust gases from the steam generator serve as an inert gas which is directed through the collected liquid to increase the turbulence thereof while at the same time additional reducing agents may be introduced into the liquid, in some cases with additional sodium sulfate, for improving the purity of the collected liquid as well as for decreasing the amount of non-reduced sodium sulfate in the liquid. Secondary air is supplied to the steam generator for burning therein the exhaust gases from the combustion chamber.

Utilization of inorganic sulfur sources by Staphylococcus aureus strains

Abstract: Staphylococcus aureus strains of different host-adapted variants (Meyer 1966) have been tested for their ability to use inorganic sulfur sources. All the 25 strains tested were able to utilize sodium sulfide as sulfur source in a medium similar to that described by Kloos and Pattee (1965). Using S. aureus strain 116/74 grown in a medium containing Na2-35S as the only sulfur source we studied incorporation and insertion of inorganic sulfide into sulfur containing amino acids. In disintegrated and fractionated cellular material we could find 35S labelled homocystine and methionine as major compounds, and cystine, cysteic acid, homocysteic acid, and beta-sulphopyruvate as minor compounds. The occurrence of homocystine and the sulfonic acids in bacterial proteins is rather uncommon.

Process for recovery of chemicals from pulping waste liquor

Abstract: A process for recovery of chemicals from a sodium sulfite pulping waste liquor is disclosed in which a smelt obtained from the waste liquor is introduced into an aqueous slurry containing solidified smelt while make up water and a weak aqueous slurry are supplied to effect incomplete dissolution of the smelt into the aqueous slurry to maintain the content of total solid and the temperature of the slurry at constant levels, the resulting aqueous slurry is subjected to a solid-liquid separation to obtain a wet cake having the molar ratio of S/Na2 O substantially equal to that of the smelt, the wet cake is mixed with hot particles of sodium carbonate and sodium sulfite while hot air is supplied to effect oxidation of sodium sulfide in the wet cake to sodium sulfite and then the oxidized product is dissolved in aqueous medium and sulfur dioxide-containing gas, preferably the exhaust gas from the recovery boiler, is contacted with the resulting aqueous solution to convert sodium carbonate into sodium sulfite, whereby the overall process is carried out in a closed system and the sulfur component and the sodium component present in the waste cooking liquor are recovered and regenerated into a cooking liquor.

Separate recovery of silver and gold from cyanide solutions

Abstract: Silver and gold are selectively recovered from cyanide solutions by addition of lime, and precipitation of the silver as sulfide by means of sodium sulfide, followed by electrowinning of gold from the filtrate.

Method of stabilizing sludge containin heavy metals and making it harm less

Abstract: PURPOSE:In caking sludge containing heavy metals such as total Hg, hexavalent Cr, Cd, etc. with cement, by kneading the sludge with cement, sodium sulfide, Fe3O4 etc., outflow of the sludge is prevented and the heavy metals are stabilized and made harmless.

Preparation of pentachlorothiophenolthiophenol

Abstract: PURPOSE: To obtain pentachlorothiophenol in a high yield industrially advantageously, by reacting hexachlorobenzene with sodium sulfide or sodium hydrosulfide in a specific solvent under specific conditions. COPYRIGHT: (C)1979,JPO&Japio

Trialkoxysilylalkanethiols and bis(trialkoxysilylalkyl) sulfides

Abstract: 1. Trialkoxyalkanethiols have been synthesized by the reaction of chloroalkyltrialkoxysilanes with NaHS, as well as by the sodium-methoxide-catalyzed splitting of the thioacetates (RO)3Si(CH2)n·SCOCH3. 2. Bis(trialkoxysilylalkyl)sulfides have been synthesized by reacting chloroalkyltrialkoxysilanes with sodium sulfide.