390results about "Preparation of metal alcoholates" patented technology

A method of synthesising gallium or indium alkoxide from the corresponding gallium or indium halide, the method comprising the step of reacting the gallium or indium metal halide with the alkoxide of an alkali earth metal, to produce the desired metal alkoxide essentially free of chlorine contamination. The method provides a composition comprising a solution of gallium or indium alkoxide of high purity, the composition having a chloride content of less than 30 ppm, a barium or strontium content of less than 30 ppm, and a sodium or potassium content of less than 30 ppm, without requiring any additional steps.

The invention provides a method for preparing amorphous spherical particle alkoxy magnesium. In the method for preparing the amorphous spherical particle alkoxy magnesium, magnesium powder and mixed alcohol are used as raw materials, halogen monomer and/or inorganic halide are/is used as a halogenating agent, an organic halogen-containing compound is used as a modifier, and one or more inertial organic solvents are used as a dispersing agent; and the obtained spherical particle alkoxy magnesium has higher stacking density, more perfect particle shape and higher particle size distribution uniformity. The alkoxy magnesium is particularly suitable to be used as an olefin polymerization catalyst carrier. The obtained catalyst has high activity, higher stacking density, good particle shape and uniform distribution and is suitable for devices for producing polypropylene by gas-phase processes.

A process for preparing sodium methoxde (or ethoxide) by alkali method includes reaction between excess methanol (or ethanol) and sodium hydroxide to obtain product, dewatering the vapour of methanol (or ethanol) by parallel two molecular sieves for alternative adsorption and desorption, and rectifying the solution of methanol (or ethanol) for reuse. Its advantage is no pollution.

The invention belongs to the field of a heat stabilizer for PVC (polyvinyl chloride) and relates to an environmental-friendly high-efficiency composite heat stabilizer for tribasic zinc PVC (polyvinyl chloride) and a preparation method of the environmental-friendly high-efficiency composite heat stabilizer. The environmental-friendly high-efficiency composite heat stabilizer for the tribasic zinc PVC (polyvinyl chloride) is prepared by performing a reaction of tribasic zinc, calcium stearate, a lubricant and an auxiliary heat stabilizer, wherein the tribasic zinc is prepared by mixing pentaerythritol and zinc oxide according to a weight ratio of 6-8:3 and performing a reaction for 4 to 6 hours at a temperature of 140 to 180 DEG C. The preparation method comprises the following steps of: adding the tribasic zinc and the calcium stearate into a reaction kettle for sufficiently mixing; adding the mixed materials into a kneading machine to knead for 15 to 25 minutes at a temperature of 100 to 120 DEG C; adding a lubricating agent and the auxiliary heat stabilizer in the kneading machine to knead and stir for 25-35min; and carrying out discharging, tabletting, sieving and packaging to obtain the finished product. The prepared environmental-friendly high-efficiency composite heat stabilizer for the tribasic zinc PVC (polyvinyl chloride) has the characteristics that the environmental-friendly high-efficiency composite heat stabilizer is difficult to separate out and has good stabilizing effect; the balancing torque can be reduced; and the processing property is improved. Moreover, the environmental-friendly high-efficiency composite heat stabilizer for the tribasic zinc PVC (polyvinyl chloride) has the advantages of high efficiency and environment protection.

Compounds, synthesis of, and methods for synthesizing metal alkoxide derivatives; and metal alkoxide derivatives for use as flame retardants are described. Group 13 metal alkoxides having flame retardant properties may be prepared by reacting the group 13 metal trihydroxide with an alcohol.

The invention relates to a dialkoxyl magnesium carrier, which is a product produced by a reflux reaction of magnesium, an alcohol and mixed halogenated agents under an inert atmosphere. The mixed halogenated agents are iodine and magnesium chloride, and the weight ratio between iodine and magnesium chloride is 0.05:1-1:0.01. The dialkoxyl magnesium carrier is spheroid with uniform particle size distribution, excellent particle morphology and high bulk density. A solid catalyst component and a catalyst based on this carrier for olefin polymerization are also provided, and olefin polymers having a wide molecular weight distribution, good stereoregularity, excellent particle morphology and a low content of fine powders can be obtained.

A magnesium compound represented by the formula (I):

Mg(OC₂H₅)_2−n(OR¹)_n  (I)

where R¹ is C_mH_2m+1 (where m is an integer of from 3 to 10), and n is a numerical value satisfying 0<n<0.35; a solid catalyst component for olefin polymer using the magnesium compound; a catalyst for olefin polymer; and methods of producing olefin copolymers such as a propylene-based random copolymer and propylene-based block copolymer by using the catalyst for olefin polymer.

The invention belongs to the technical field of chemical engineering, and particularly relates to an efficient composite heat stabilizer for pentaerythritol cerium-based PVC and a preparation method of the heat stabilizer. The efficient composite heat stabilizer is prepared from the following raw materials in weight part: 30-50 parts of pentaerythritol cerium, 10-15 parts of barium stearate, 20-30 parts of calcium stearate, 20-30 parts of a lubricant and 10-15 parts of an auxiliary heat stabilizer. The preparation method comprises the following steps: firstly the pentaerythritol cerium, barium stearate and calcium stearate are added into a reaction kettle for fully mixing, the well mixed material is added into a kneading machine and kneaded for 20-30 minutes at the temperature of 100-120 DEG C, then the lubricant and the auxiliary heat stabilizer are added into the kneading machine, and kneaded and mixed for 30-40 minutes, the material is discharged, and the tabletting, sieving and packing are performed, so that the efficient composite heat stabilizer is obtained. The efficient composite heat stabilizer prepared through the preparation method has the characteristics that the heat stabilizer is difficult to separate out, excellent in stability, low in cost, non-toxic and environmentally friendly, and the raw material is easy to obtain. The preparation method provided by the invention causes no pollution, is low in energy consumption, is scientific, reasonable and simple, and is easy to realize.

The invention relates to the field of fluorine-containing fine chemistry, in particular to a method for preparing a hexafluoropropylene oxide trimer. Hexafluoropropylene oxide is used as a raw material, hexafluoropropylene oxide dimer alkoxide and fluorinated alkali metal salt are used as composite catalytic initiators, a chain transfer polymerization inhibitor is added, and the hexafluoropropylene oxide trimer is prepared after a reaction. The conversion rate of hexafluoropropylene oxide and the selectivity of the hexafluoropropylene oxide trimer are high in the method, and the operation method is simple, feasible, easy to control industrially and suitable for mass industrial production.