43results about "Aluminium halides" patented technology

Disclosed is a clean method for preparing layered double hydroxides (LDHs), in which hydroxides of different metals are used as starting materials for production of LDHs by atom-economical reactions. The atom efficiency of the reaction is 100% in each case because all the atoms of the reactants are converted into the target product since only M²⁺(OH)₂, M³⁺(OH)₃, and CO₂ or H_nAⁿ⁻ are used, without any NaOH or other materials. Since there is no by-product, filtration or washing process is unnecessary. The consequent reduction in water consumption is also beneficial to the environment.

A method for preparation of iodizing agent for the use in the formulation of iodised salt that offers excellent stability of iodine in iodised salt is developed and the unrefined salt iodised with this compound was tested for its stability in presence of moisture, temperature and metal salts at higher temperature. The hydrotalcite type layered compound was used to prepare such compound and part of carbonate was substituted with iodate anion. The iodising agent exhibited excellent stability of iodine in iodised salt.

A method for producing halide brine wherein an alkali and a reducing agent are added to an aqueous fluid having a density greater than 8.30 lb/gal., (0.996 kg/L) water, waste water or sea water for example. The resulting fluid is then contacted with a halogen to form a halide brine. The reaction occurs in a conventional reactor such as a mixing tank.

The invention belongs to the field of comprehensive utilization of a low-grade bauxite or kaolin (siallitic soil) raw material, and in particular relates to processes such as wet-method alkalinizing calcination, separation of aluminum and silicon compounds and the like. The process comprises the following steps: mixing the ground siallitic soil raw material with a proper amount of strong alkali and water, drying and performing calcined activation; grinding the calcined material, and then adding the ground material and a proper amount of water into a reaction tank (reaction kettle) so as to bedissolved into NaAlO2 and Na2SiO3 solutions as well as a small amount of solid at a proper temperature within a period of time; filtering, separating and adjusting the pH value so as to separate out Al(OH)3 and H2SiO3; and filtering and adjusting the pH value once again so as to separate out AlCl3 and H2SiO3, wherein, the AlCl3 is used for synthesizing aluminium polychloride and the H2SiO3 is used for producing white carbon black. The process provided by the invention has the beneficial effects that the dissolution efficiency of the raw material can be obviously improved, the whiteness and yield of the aluminium polychloride are increased, the high-value white carbon black can be produced, and the heat consumption is lowered, thus achieving great economical and environmental benefits.

As population density increases, the transportation of hazardous chemicals, including acids and disinfectants, lead to an increased incidence of spills while the consequences of spills become more serious. While solutions of halide acids, hypohalites and halites are safer disinfectants for transportation, handling, storage and use than traditional gaseous chlorine, the manufacturing cost of these disinfectants has here-to-fore limited their use. Economical processes are presented for the manufacture of O₂, halogen oxides, halide acids, hypohalites, and halates; as well as polynucleate metal compounds, metal hydroxides and calcium sulfate hydrate (gypsum). The instant invention presents methods and processes that incorporate the use of sulfur. This is while environmental regulators, such as the US EPA, require an increased removal of sulfur from hydrocarbon fuels, thereby creating an abundance of sulfur, such that the refining industry is in need of a way to dispose of said abundance of sulfur.

The present invention provides a method for producing polycrystalline silicon. The method for producing polycrystalline silicon comprises the steps of (A), (B), and (C),

• (A) reducing a chlorosilane represented by the formula (1) with a metal at a temperature Ti to obtain a silicon compound;

SiH_nCl_4-n  (1)

wherein n is an integer of 0 to 3,

• (B) transferring the silicon compound to a zone having a temperature T2, wherein T1>T2; and
• (C) depositing polycrystalline silicon in the zone having a temperature T2,

wherein the temperature T1 is not less than 1.29 times of a melting point (Kelvin unit) of the metal, and the temperature T2 is higher than a sublimation point or boiling point of the chloride of the metal.

The present invention is drawn to a method for removing colloidal titanium dioxide and titanium oxychloride from by-product hydrochloric acid. The method includes adding phosphate ion source and quaternary amine to the by-product acid to cause the titanium dioxide and the titanium oxychloride to form a precipitate. The precipitate can then be separated from the acid, thus producing a decontaminated hydrochloric acid product with reduced levels of titanium.