7117 results about "Sodium salt" patented technology

A composition useful for nitrate removal, and treatment of water, selected from mining, agriculture industries, military operations, or others water stream, or industrial waters, livestock wastewater and a livestock water stream or from other sources, which comprises a sufficient amount of organic modified clay, a highly crosslinked carbohydrate polymer with branched-chain structure and having present sulfide or disulfide group, or alloy or blend with triazine-trithione sodium salt, high swelling sodium bentonite or calcium bentonite, and activated carbon, without pH adjustment, and/or presents of electropositive metals inorganic acid or alkaline compounds.

The invention relates to a method for preparing lithium carbonate by extracting lithium from lepidolite. The method comprises the following steps of: a. calcination and defluorination at a high temperature; b. grinding; c. autoclaving; d. impurity removal; e. condensation; f. sodium separation by freezing; g. ithium precipitation by carbonization, wherein, in the step c, the grinded lepidolite, calcium oxide and sodium salt are thrown into a high-pressure kettle for autoclaving; the lepidolite is decomposed in the continuous stirring state; and alkali metal in the lepidolite is subject to ion exchange, turned into salt and dissolved out. In the step d, an autoclaving mother solution and autoclaving residues are obtained after separation and autoclaving; sodium hudroxide with slightly excess amount according to the Lithia content in the autoclaving mother solution is added and evenly stirred, then activated carbon is added for filtering and impurity removal. In the step g, CO2 is led to a sodium separation mother solution till the PH value of the solution is equal to between 9 and 10; the mother solution is heated, stirred, carbonized and subject to centrifugal water spinning and separation to obtain coarse lithium carbonate; backwashing and drying are carried out to the coarse lithium carbonate, thereby obtaining a product of lithium carbonate. The method has the advantages that: the method has high lithium yield rate; residues can be utilized; and sodium salt can be recycled, etc.

The above-described and other deficiencies of the art are met by a method of making a polycarbonate polymer comprising isosorbide carbonate units, comprising melt reacting a dihydroxy compound comprising an isosorbide of the general formula (2a):

and an activated carbonate, in the presence of a catalyst consisting essentially of a sodium salt capable of providing a hydroxide ion, wherein the polycarbonate polymer comprises greater than or equal to 50 mol % isosorbide carbonate units, and wherein the polycarbonate polymer has a Mw of greater than or equal to about 40,000 g/mol as determined by gel-permeation chromatography relative to polystyrene standards. Polycarbonates comprising the isosorbide carbonate unit, including isosorbide homopolycarbonate and an isosorbide-based polyester-polycarbonate, are also disclosed, as are a thermoplastic composition and an article including the isosorbide-based polycarbonate polymer.