Abstract:
A process is described for the catalytic removal of H2S gas from a sour gas stream in the presence of a chelate ligand of the formula (I) 1 where: X is hydrogen, an alkali metal or NH4null, n is 1, 2 or 3, and at least one of the radicals R1 to R6 is alkyl, aryl, alkyloxy, aryloxy, carboxyl or hydroxyl, the remaining radicals being hydrogen, and the metal in the metal chelate complex is a polyvalent metal, which can occur in more than one oxidation state. A mixture is also described for removing H2S gas from a sour gas stream, the mixture comprising an aminocarboxylate-containing metal chelate complex, and the use is also described of an aminocarboxylate-containing metal chelate complex for removing H2S gas from a sour gas stream.
Abstract:
A coagulant which is the reaction product of a trivalent metal salt, excluding chromium salts, an acid phosphorous compound and an aluminum hydroxy chloride, and a process for preparing such coagulant. This coagulant may be effectively used to remove suspended solids and various impurities in most water treatment applications.
Abstract:
Compounds of the formula (I) and (Ia) in the form of racemates, mixtures of diastereomers or in essentially enantiomerically pure form, (I), (Ia), where R is hydrogen, C1-C8alkyl, C5-C12cycloakyl, phenyl or phenyl substituted by from 1 to 3 C1-C4alky or C1-C4alkoxy groups; n is 0 or an integer from 1 to 4 and R1 are identical or different subtitutuents selected from the group consisting of C1-C4alkyl, C1-C4fluoroalkyl and C1-C4alkoxy; X1 and X2 are each, indenpendently of one another, secondary phosphino; T is C6-C20arylene or C3-C16heteroarylene; and X2 is bound in the ortho position relative to the T-cyclopenitadienyl bond. The compounds are ligands for complexes of metal selected from transition groups (I) and (VIII) of the Periodic Table of the Elements, and these metal complexes are valuable catalysts for the asymmetric addition of hydrogen, boron hydrides or silanes onto carbon-carbon or carbon-heteroatom multiple bonds in prochiral organic compounds or the asymmetric addition of carbon nucleophiles or amines onto allyl compounds. 1
Abstract:
An improved catalyst based on cobalt and/or rhodium dissolved in a non-aqueous ionic solvent which is liquid at a temperature of less than 90null C. More particularly, the catalyst comprises at least one complex of cobalt and/or rhodium coordinated with at least one nitrogen-containing ligand and the non-aqueous ionic solvent comprises at least one quaternary ammonium and/or phosphonium cation and at least one inorganic anion.
Abstract:
An S,S-ethylenediamine-N,Nnull-disuccinic acid iron alkali salt which contains a lactam compound represented by the following general formula (1): 1 wherein M is an ammonium ion or an alkali metal ion, and an ethylenediaminemonosuccinic acid represented by the following general formula (2): 2 wherein M is an ammonium ion or an alkali metal ion, in an amount of 7 wt % or less, respectively.
Abstract:
The invention relates to a novel class of ligands, complexes comprising such ligands and a metal ion, and adducts of these metal complexes and a macromolecule. Pharmaceutical compositions and methods of making and using the ligand-metal complexes are also described. The invention also relates to the use of macromolecular adducts for enhancement of diagnostic imaging. In particular, the invention relates to (ethylene)-(propylene)-triaminepentaacetic acid (EPTPA) derivatives, a process for their production, and their use for the production of pharmaceutical agents for NMR diagnosis or radiodiagnosis or radiotherapy.
Abstract:
A method of preparing metal mesoporphyrin halide compounds is described. The metal mesoporphyrin halide compound may be formed by forming a novel mesoporphyrin IX intermediate compound and then converting the mesoporphyrin IX intermediate to the metal mesoporphyrin halide through metal insertion. The novel intermediate compound may be formed by a catalytic hydrogenation of hemin in acid and subsequent recovery.
Abstract:
A process for producing ferrous picrate and a fuel additive containing ferrous picrate involving placing wire composed of an alloy of iron in any solution of picric acid in a solvent that is known in the art for reacting with iron to produce ferrous picrate. The wire can be suspended in the solution or placed upon the bottom of a reaction vessel that holds the solution. Preferably the wire is loosely coiled, at least when placed upon the bottom of a reaction vessel. Also preferably, after a concentrated fuel additive has been prepared, to the concentrate is added so much of a pre-mix solution produced by the steps of (a) dissolving picric acid in the same kind of solvent that was utilized to produce the solution into which the steel wool was placed and (b) removing water from the precursor to the pre-mix solution thus produced and so much of the same kind of alcohol that was utilized to produce the solution into which the steel wool was placed that the final product produced thereby contains approximately 1.9 percent free picric acid and 15 to 16 percent of the alcohol.
Abstract:
Mixed bis-imine pyridine ligands of formula (I), wherein Z1, which is different from Z2, is an optionally substituted aryl group; and Z2 comprises an optionally substituted heterohydrocarbyl moiety, or an optionally substituted aryl group in combination with a metal, said optionally substituted aryl group being null-co-ordinated to the metal; 1 mixed bis-imine pyridine complexes comprising a ligand of formula (I); mixed ionic bis-imine pyridine complexes comprising a ligand of formula (I); and processes for the production of alpha olefins from ethylene, using said complexes.
Abstract:
Compounds able to chelate bi- and trivalent paramagnetic metal ions, their chelated complexes with said metal ions and the physiologically compatible salts thereof, as well as the use thereof as contrast agents in the technique known as nullMagnetic Resonance Imagingnull (M.R.I.).