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Continuous process for the removal of hydrogen sulfide from a gaseous stream - Patent 4765873 Thereafter, the enriched aqueous solution of ammonium sulfide, ammonium hydroxide, and hydrogen sulfide is introduced into the anode compartment of an electrolytic cell operated at ambient temperature and pressure containing an anode and anolyte in said anode compartment, a cell membrane, and a cathode and catholyte in a cathode compartment. Ammonium hydroxide together with ammonium polysulfide produced in the anode compartment are withdrawn from the cell through line 32 and pass either through line 34 or through line 28, respectively, back to the contact zone or to a heating zone supplied with an oxygen containing gas through line 25. When the aqueous solution of ammonium hydroxide and ammonium sulfide is led to the electrolysis zone, the sulfide ions are electrolytically oxidized to polysulfide at the anode and at the same time hydrogen and hydroxide ions are produced at the cathode. www.freepatentsonline.com /4765873.html   (4431 words)

Ammonium sulfide - Wikipedia, the free encyclopedia Ammonium sulfide, (NH, is obtained, in the form of micaceous crystals, by passing hydrogen sulfide mixed with a slight excess of ammonia through a well-cooled vessel; the hydrosulfide NH •HS is formed at the same time. The common "stink bomb" consists of a solution of ammonium sulfide in water, sealed inside a glass ampoule. When the glass is broken, ammonia and hydrogen sulfide gases, both of which have a powerful unpleasant smell, are released from the solution. en.wikipedia.org /wiki/Ammonium_sulfide   (219 words)

U.S. Patent: 5637206 - Process for the electrochemical production of ammonium polysulfide - June 10, 1997 The ammonium polysulfide is produced in at least one electrochemical cell, to which an aqueous ammonium sulfide solution is supplied as electrolyte. An aqueous ammonium sulfide solution is supplied to the electrolyte chamber, where the content of (NH.sub.4).sub.2 S lies in the range from 0.1 to 200 g/l, and preferably is at least 10 g/l. Sulfide is reacted in an amount of 6.8 g/h, of which 93% are determined to be APS by means of a sulfur analysis. www.everypatent.com /comp/pat5637206.html   (3803 words)

naming of binary compounds S is potassium sulfide because you have a potssium atom bonded to a sulfur atom. We now find that the ammonium radical, NH is considered as a simple positive ion, and even though it is not a metal, it would go at the front of a compound name. Cl is ammonium chloride because you have an ammonium radical bonded to a chlorine atom. library.thinkquest.org /19957/nomen/binarybody.html   (1103 words)

Ammonium Bisulfide Page Ammonium bisulfide corrosion of reactor effluent air coolers (REAC) and stripper overhead is a reliability issue for the refining industry. Organic sulfur and nitrogen compounds are converted to hydrogen sulfide and ammonia in hydrotreater reactors. Downstream from the point of injection, the equipment is then subjected to a sour alkaline solution with high concentration of hydrogen sulfide, ammonium bisulfide, and contaminants such as chloride, cyanide, and dissolved oxygen. www.setlaboratories.com /ammonium-bisulfide.htm   (804 words)

Sulfides, Inorganic   (Site not responding. Last check: 2007-09-17) Simple salts of sulfides (such as sodium, potassium, and ammonium sulfide) react vigorously with acids to release hydrogen sulfide gas. Hydrogen sulfide is a toxic gas that irritates the eyes and mucous membranes at concentrations of around 50 ppm (sensitivity varies considerably from person to person). Ammonium hydrosulfide, sodium hydrosulfide, ammonium sulfide, antimony sulfide, arsenic sulfide, arsenic trisulfide, lead sulfide, hydrogen sulfide, mercuric sulfide, phosphorus heptasulfide, potassium hydrosulfite, potassium sulfide, selenium disulfide, sodium sulfide. www.epa.gov /ceppo/cameo/help/chapte31.htm   (225 words)

PT J   (Site not responding. Last check: 2007-09-17) Adsorption and biological degradation of ammonium and sulfide on peat. The rate of biological degradation of ammonium on peat was found to vary between 10 and SO (mg NH4+) (kg dry peat)(-1) h(-1), depending on the alkalinity of the liquid phase. It is suggested that aerobic sulfide removing biofilters and biotrickling filters may remove sulfide by a two step process involving initial chemical oxidation to elemental sulfur followed by slower biological oxidation to sulfate. www-rcf.usc.edu /~bfilter/f332.html   (281 words)

OSHA warning about sour water (ammonium bisulfide) corrosion - Corrosionsource Discussion Boards Sulfur and nitrogen compounds are converted by a catalyst in the first stage reactor to hydrogen sulfide and ammonia. Ammonium bisulfide, also called ammonium hydrogen sulfide (NH(4)HS), is a metal reagent. Concentrated ammonium bisulfide is highly corrosive to carbon steel. www.corrosionsource.com /discuss2/ubb/Forum57/HTML/000001.html   (684 words)

What is ammonium sulfide ?   (Site not responding. Last check: 2007-09-17) Aitch-two-ess is also used in analytical chemistry as a test for the presence of certain metallic ions in a solution (don't ask me, this bit of knowledge was gained 40 years ago), and the stuff is flammable in the presence of oxygen. *Ammonium Sulfide is a FLAMMABLE LIUQID and a FIRE HAZARD. Hydrogen sulfide is "sewer gas", an overwhelming rotten egg smell as a trace gas and highly toxic in moderate concentrations. www.freerepublic.com /focus/f-news/599850/posts   (1760 words)

CR Scientific: Chemistry / Biochemistry Experiments: Preparation of Ammonium Sulfide Ammonium sulfide is a very useful reagent in mineral analysis. Vinyl or polyethylene gloves are necessary when handling ammonium sulfide reagent, and all work with it must occur in a well-ventilated area. The ammonium sulfide solution, prepared as outlined above, can be used to precipitate certain metal cations as sulfides (some, such as iron, precipitate as hydroxides if the pH is adjusted toward alkalinity). www.crscientific.com /nh4sulfide.html   (1088 words)

Guide to specification for: General notices; General analytical techniques; Identification tests; Test solutions and ...   (Site not responding. Last check: 2007-09-17) Sodium hydroxide TS decomposes ammonium salts with the evolution of ammonia, recognizable by its odour and its alkaline effect upon moistened red litmus paper. Solutions of magnesium salts in the presence of ammonium chloride yield no precipitate with ammonium carbonate TS, but a white, crystalline precipitate, which is insoluble in ammonia TS, is formed upon the subsequent addition of sodium phosphate TS. Zinc salts, in the presence of sodium acetate, yield a white precipitate with hydrogen sulfide. apps3.fao.org /jecfa/additive_specs/docs/t0368e/T0368e13.htm   (1390 words)

Corrosion Protection & Resistance: Brown Statuary Finishes In conversion coatings, the metal surface is either converted into a protective film, usually an oxide or sulfide of the metal involved, or a compound is precipitated which forms a surface film. Modifications of these formulas called for the use of sodium, potassium, barium, and ammonium sulfides, which were claimed to produce different shades, but almost all sulfide colors are now produced from solutions of polysulfides which are sold in concentrated form under a number of trade names, usually called "oxidizing liquid." Solutions of 2%-l0% aqueous ammonium sulfide, potassium sulfide (liver of sulfur) or sodium sulfide (liquid sulfur) are swabbed or brushed on. www.copper.org /resources/properties/protection/brown.html   (1510 words)

Processing of ammonium paratungstate from tungsten ores - Patent 4115513 At least one of ammonium sulfide and thioacetamide is and the heated solution is acidified to a pH in the range from about 2 to 3 to precipitate any molybdenum as MoS.sub.3. This invention relates to the production of lamp filament grade ammonium paratungstate from tungsten ores and, more particularly, to a purification process which is operable to produce lamp grade ammonium paratungstate from any of a variety of tungsten ores. The amount of ammonium sulfide or thioacetamide added is not critical provided there is more than that amount required to react with the molybdenum present to form the trisulfide. www.freepatentsonline.com /4115513.html   (4034 words)

Nitrogen, Carbon, and Sulfur Metabolism in Natural Thioploca Samples -- Otte et al. 65 (7): 3148 -- Applied and ...   (Site not responding. Last check: 2007-09-17) Nitrite and ammonium in the supernatant were determined colorimetrically (as described in references 14 and 5, respectively). sulfide were oxidized to sulfate then a ratio of 1 would be expected. sulfide is oxidized to sulfur and that further oxidation of sulfur aem.asm.org /cgi/content/full/65/7/3148   (7078 words)

Guide to specification for: General notices; General analytical techniques; Identification tests; Test solutions and ...   (Site not responding. Last check: 2007-09-17) Dissolve 67.5 g of ammonium chloride (NH C1) in water, add 570 ml of ammonium hydroxide (28%) and dilute with water to 1,000 ml. Dissolve 50 g of chloral hydrate in a mixture of 15 ml of water and 10 ml of glycerol. Dissolve 90 g of manganese sulfate in 200 ml of water, 175 ml of phosphoric acid and 350 ml of diluted sulfuric acid (1 in 2). apps3.fao.org /jecfa/additive_specs/docs/t0368e/T0368e16.htm   (8283 words)

Boiler alerts and hazard bulletins Sulfur and nitrogen compounds are converted by a catalyst in the first stage reactor to hydrogen sulfide and ammonia. Concentrated ammonium bisulfide is highly corrosive to carbon steel. To reduce corrosion, wash water is introduced in the system since ammonium bisulfide is highly soluble in water. www.saftek.com /boilerhib7.html   (726 words)

Basic Tests for Pharmaceutical Substances: 5. Reagents Dissolve 0.5 g of ammonium molybdate R in sufficient sulfuric acid (~ 1760 g/l) TS to produce 10 ml. Ammonium thiocyanate (75 g/l) TS must be freshly prepared. Dissolve 5 g of ceric ammonium sulfate R in sufficient nitric acid (~ 130 g/l) TS to produce 100 ml. www.who.int /medicinedocs/library.fcgi?e=d-0edmweb--00-1-0--010---4----0--0-10l--1en-5000---50-about-0---01131-0011cbMB3ocm9ee80ca70000000044c8ab49-0utfZz-8-0-0&a=d&c=edmweb&cl=CL2.1.1&d=Jh1803e.6   (2336 words)

Safety (MSDS) data for ammonium sulfide solution   (Site not responding. Last check: 2007-09-17) Safety data for ammonium sulfide solution (typically 46-52%) The information on this web page is provided to help you to work safely, but it is intended to be an overview of hazards, not a replacement for a full Material Safety Data Sheet (MSDS). This compound readily releases hydrogen sulfide, which is a serious poison. physchem.ox.ac.uk /MSDS/AM/ammonium_sulfide_solution.html   (340 words)

topic12B Note the dark brown precipitate of bismuth sulfide that is insoluble in either yellow ammonium sulfide or in sodium hydroxide. The sulfides of cobalt and nickel dissolve in concentrated hydrochloric acid in the presence of potassium chlorate or in aqua regia. Oxidation by the free sulfur in the ammonium sulfide occurs, so the S in the equation come from the ammonium sulfide. www.uq.edu.au /_School_Science_Lessons/topic12B.html   (10655 words)

No Title   (Site not responding. Last check: 2007-09-17) They were applied in studies of the distribution of dissolved oxygen, ammonium, nitrate, sulfide, pH and redox potential in environmental biofilms with stratified microbial communities. Heterotrophic, nitrifying and sulfate reducing biofilms were developed in laboratory-based rotating drum reactors fed with synthetic wastewaters containing different COD and nutrition levels according to the specific requirements of bacteria. All the microsensors used in the studies had tip diameters of less than 5um except for the sulfide microsensor which had a tip diameter of 15um. www.ececs.uc.edu /~mcahay/bishop2.html   (354 words)

Penetron | Technical Information   (Site not responding. Last check: 2007-09-17) Sulfides leaching from damp coal may oxidize to sulforous or sulfuric acid, or ferrous sulfate Ammonium salts seldom present in sufficient quantity to disintegrate Sulfides, sulfates, or acids present disintegrate concrete and attack steel in porous or cracked concrete www.penetron.com /_html2/testdata_chem.htm   (207 words)

Sciencemadness Discussion Board - Powered by XMB The reaction should evolve toxic hydrogen sulfide but considering iron sulfide is insoluble and I'll be using dilute acids I wouldn't expect it to be very rapid at all. Anyway this is done in a stoppered flask with a tube running into another stoppered flask filled with ammonium hydroxide solution to bubble the H2S through it. I've found that my method won't work anyway because ammonium sulfide decomposes into ammonia and H2S from heating at lowish temperatures so I wouldn't be able to remove the excess ammonium hydroxide. www.sciencemadness.org /talk/viewthread.php?tid=837   (502 words)

CHEMICALS from Ukraine   (Site not responding. Last check: 2007-09-17) Ammonium nitrate, ammonium chloride, iron sulfate 7-hydrous, basic zinc carbonate, zinc sulfate, and manganese sulfate. Ammonium nitrate, ammonium rhodanide, ammonium chloride, barium carbonate, hydroxylamine hydrochloride, hydroxylamine sulfate, potassium ferricyanide, potassium rhodanide, zirconium oxide, potassium nitrite. Ammonium nitrate, ammonium sulfate, aluminum hydroxide, barium carbonate, barium nitrate, potassium nitrate, potassium carbonate, calcium carbonate, lead oxide, zirconium dioxide, sodium sulfate, 10-hydrous, sodium sulfate anhydrous, sodium biborate, sodium rhodanide, lead nitrate, potassium acetate, potash alum, etc. www.trade-intermediary.com /ukrainechemicals.htm   (372 words)

AMMONIUM SULFIDE SOLUTIONS The flashpoint of a 20-24% solution of ammonium sulfide is 60C (140F) (closed cup). May lose integrity with age; ammonium sulfide slowly produces hydrogen sulfide and ammonia in the presence of moisture. Emits toxic fumes of sulfur oxides, nitrogen oxides, hydrogen sulfide, ammonium bisulfite, and ammonia when heated to decomposition. www.jtbaker.com /msds/englishhtml/a6204.htm   (1145 words)

New Page 1 These control the downward transport of nitrate and the upward transports of ammonium and sulfide near the interface zone. However, it is most easily studied in the Black Sea owing to the great physical stability of the water column, which enabled accurate resolution of the oxygen and sulfide gradient structure. Observed, and simulated profiles of dissolved oxygen, hydrogen sulphide, nitrate and ammonium within the Suboxic Layer and onset of the sulfide zone. www.ims.metu.edu.tr /cv/oguz/bio-pump.htm   (1108 words)

Aqueous ammonium sulfide to modify the surface of low @k dielectric thin films Aqueous ammonium sulfide to modify the surface of low @k dielectric thin films Since most of the polymer surfaces are hydrophobic and relatively inert, it is often the goal to functionalize their surface without damaging the underlying sub-surface material. This study focuses on the use of ammonium sulfide to modify the surface of low @k thin-film materials utilized as interlayer dielectrics for ultra-large-scale integrated (ULSI) devices. www.aapspharmaceutica.com /search/view.asp?ID=37651   (276 words)

Balancing Problems cadmium phosphate (c) + ammonium sulfide (aq) --> cadmium sulfide (c) + ammonium phosphate (aq) zinc chloride (aq) + ammonium sulfide (aq) --> ammonium sulfide (aq) + iron (II) nitrate (aq) --> www.sciencebyjones.com /balancing_problems.htm   (507 words)

Ammonium_sulfide_solution(Fisher) Synonyms: Diammonium sulfide; Ammonium monosulfide; Ammonium sulfide ((NH4)2S). Ammonium sulfide: No OSHA Vacated PELs are listed for this chemical. Contact with incompatible materials may release poisonous and flammable hydrogen sulfide gas. www.ecsu.ctstateu.edu /depts/env_saf/msdshtml/Ammonium_sulfide_solution(Fisher).html   (959 words)

Wired 14.06: DIY Science Pour 15 grams of ammonium dichromate through the funnel into the center of the beaker to create a cone-shaped pile of crystals. Afterward, use a spatula to tap the beaker and loosen the lava from its sides. Warning: Ammonium sulfide is toxic and irritating to the respiratory tract. www.wired.com /wired/archive/14.06/lab.html   (552 words)

Regents Prep Chemistry: Multiple-Choice Question Archive Ammonium sulfate has 3 kinds (N, H, S). Ammonium sulfate has 4 kinds (N, H, S, O). This question may require the use of the Chemistry Reference Tables or the Periodic Table of Elements. regentsprep.org /Regents/core/questions/questions.cfm?Course=CHEM&TopicCode=02   (1485 words)

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