摘要:
A novel process is described for the preparation of novel organic solutions of organooxy magnesium compounds of low viscosity, which solutions are formed in the presence of at least 5 mol % based on the magnesium compound of an organooxy compound of a transition metal of Groups IV through VI of the Periodic Table.
摘要:
DOUBLE METAL ALKOXIDES OF THE FORMULA M(AI(OR)4)2 ARE CONVERTED BY PYROLYSIS, OR HYDROLYSIS AND PYROLYSIS, TO ULTRA-PURE COMPOUNDS CORESSPONDING TO THE FORMULA MAI2O4 WHEREIN M IS MAGNESIUM OR CALCIUM AND R IS AN ALKYL GROUP CONTAINING FROM 1 TO 7 CARBON ATOMS.
摘要:
Tetravalent titanium alcoholate-beta diketone complexes, e.g. titanium isopropylate-triacetylacetonate, are reacted with an alkali metal amalgam in a non-polar solvent to reduce the titanium to trivalent state, forming, for example, titanium triacetylacetonate and sodium isopropylate. The sodium isopropylate is a crystalline precipitate which can be removed by filtration; the amalgam can be decanted off and reused, as in alkali metal chloride electrolysis, to restore its alkali metal content so as to be ready for re-cycling.
摘要:
The present disclosure relates to the formation of dimethyl terephthalate (DMT). The present invention also relates to the depolymerization of polyethylene terephthalate (PET) and the recovery of terephthalic acid and ethylene glycol.
摘要:
The invention provides a metal alkoxide complex of Formula (I), wherein X, M, R1, R2, R3, m, n, y and z are as defined in the Description. The invention also provides a catalyst composition comprising the metal alkoxide complex and a hydroxy-containing compound, wherein the molar ratio of the metal alkoxide complex to the hydroxy-containing compound is 1:0.1-1000. The invention also provides a production method of poly-ε-caprolactone or polyactide, wherein an ε-caprolactone monomer or a lactide monomer is reacted in the presence of the metal alkoxide complex or catalyst composition to obtain poly-ε-caprolactone or polylactide. The metal alkoxide complex and the catalyst composition thereof can be used to catalyze the synthesis of poly-ε-caprolactone or polylactide with a high efficiency. The molecular weight of polycaprolactone or polylactide can be controlled by the molar ratio of the metal alkoxide complex and the hydroxy-containing compound, and is adjustable in the range of 1000-600,000, and wherein the molecular weight distribution is from 1.03 to 1.50. [Xn-mM(OCR1R2R3)m]y.(organic solvent)z (I)