Sodium sulfide

About: Sodium sulfide is a research topic. Over the lifetime, 2851 publications have been published within this topic receiving 27733 citations. The topic is also known as: disodium sulfide.

Methods for the recovery of sulfur components from flue gas and recycle sodium sulfite by reduction-smelting and carbonating to strip hydrogen sulfide

Abstract: An improved method for recovering sulfur from flue gas which contains sulfur dioxide formed from burning sulfur containing fuels. The method first involves the reduction burning of auxilary fuel in the presence of sodium sulfite to convert it to smelt containing sodium sulfide and sodium carbonate. The smelt is dissolved, and the solution reacted with carbon dioxide, hydrogen sulfide and water vapor forming sodium hydrosulfide. The sodium hydrosulfide is reacted with a high concentration of recycled sodium bicarbonate and stripped with carbon dioxide to form sodium carbonate and release the sulfides as hydrogen sulfide from the stripper. The hydrogen sulfide released is then converted to sulfur dioxide, sulfuric acid or elemental sulfur. Pressurized carbon dioxide is used for pressure carbonation of recycled solution from the stripper to convert the sodium carbonate to the high concentration of recycled sodium bicarbonate used for stripping. The sodium carbonate and sodium bicarbonate from the stripper are reacted under pressure with sodium bisulfite in a decarbonator to form sodium sulfite and release carbon dioxide under pressure for use in the pressure carbonation. A portion of the sodium sulfite formed by decarbonation is then reduced in the smelter. The balance of the sodium sulfite is then used for absorption of the sulfur dioxide from the flue gas forming the sodium bisulfite used for decarbonation.

Synthesis of new triphenodithiazine- and indolocarbazolediones of biological interest

Abstract: Tetrabromo-p-benzoquinone reacted with excess aromatic amines to give 2,5-dirylamino-3,6-dibromo-p-benzoquinones. The latter molecules on heating with sodium sulfide in alcohol in the presence of air gave triphenodithiazinediones. Heating with copper powder in nitrobenzene transformed these compounds into the respective indolocarbazolediones. Comparative antimicrobial and antifungal activities of the studied compounds were determined and discussed.

Process for comprehensively treating sulfur dye waste water

Abstract: The invention relates to a process for comprehensively treating sulfur dye waste water. The process of the invention uses a split-flow scheme which comprises that dye bath strong liquor with high concentration can be recycled and the comprehensive waste water with low concentration can be collected. The process of the invention comprises the following steps: acidifying the dye bath strong liquor with high concentration, blowing and recovering sodium sulfide, filtering and recovering the sulfur dye, wherein the recovery rate of the sodium sulfide and the sulfur dye can respectively reach more than 85% and 95%, collecting a filtrate into a waste water treatment system for treating; pretreating the comprehensive waste water with low concentration by an electrocoagulation process and discharging or carrying out biochemical treatment. Compared with the current art, the process of the invention has the advantages of high resource recovery rate, simple flow, less equipment, less land occupation, simple operation and maintenance and the like, and is suitable for recycling and treating the sulfur dye waste water.

Applications of specific restraining agent in complicated sulfuration mine

Abstract: The invention discloses a specific inhibitor application in complex sulfide ore. The inventive organic compound contains mineral-philic group -SH, hydrophilic group -COOH, -OH, -SO3, etc. in molecular structure, which fully shows the inhibiting property against pyrrhotite, pyrite and chalcopyrite in complex sulfide ore flotation separation, and is a high selectivity desulphurizing inhibitor. Compared with the prior inorganic inhibitors such as cyanide, lime, zinc sulfate, trisodium phosphate, dichromate, potassium permanganate, sodium sulfide, sulfite, etc., the inventive inhibitor has the advantages of low usage amount, good index and no pollution.

Culture Methods for Obtaining m-Cresol-degrading Methanogenic Consortia

Abstract: Studies of the metabolism of m-cresol under methanogenic conditions have been hampered by difficulties in enriching and maintaining active consortia. With anaerobic sewage sludge as an inoculum, m-cresol degradation was shown to be inhibited by sodium sulfide at concentrations typically used to pre-reduce culture medium. In enrichment cultures, the acclimation time for m-cresol degradation was shortened from 61 days to 37 days by using diluted (24% vol/vol) sludge rather than concentrated (96%) sludge, which contained 0.8 mM total sulfide. The m-cresol degrading activity of enrichment cultures transferred to fresh medium was greater when iron nails or amorphous ferrous sulfide were used as a reducing agent in place of sodium sulfide.