Abstract: A method for preparing N,N?-bis(3-aminopropyl)-1,2-ethylenediamine uses a glycol ether based solution, such as a solution containing dipropylene glycol dimethyl ether (PM) to replace the traditionally used monol-based solvents, and performs hydrogenation in the presence of a Co—Mn—Al catalyst. The method improves the yield of N,N?-bis(3-aminopropyl)-1,2-ethylenediamine to 98.85-99.49% and effectively suppresses generation of by-products.

Abstract: A method for preparing N,N?-bis(2-cyanoethyl)-1,2-ethylenediamine involves using strongly acidic cation exchange resin as a catalyst for synthesis, and is advantageous for not only eliminating the need of distillation for purification and thereby reducing reaction time, but also improving the yield of N,N?-bis(2-cyanoethyl)-1,2-ethylenediamine to 97.70-98.08%; and the method benefits simplified process and reduced costs and helps to save water significantly, thereby minimizing environmental pollution.

Abstract: A method for preparing N,N?-bis(2-cyanoethyl-1,2-ethylenediamine involves using glycol ether as a catalyst for synthesis reaction in which ethylenediamine and acrylonitrile at a molar ratio of 1:1.9-2.1 are reactant that react at 20-70°C to prepare N,N?-bis(2-cyanoethyl)-1,2-ethylenediamine; the method improves the yield to 98.15-98.98%; and the used glycol ether may be filtered and recycled, thereby saving costs and reducing environmental pollution.

Abstract: A process for preparing PPE microspore dispersion includes steps of: dissolving a high-molecular polyphenylene ether in a first solvent at 45-110° C. to form a dissolution liquid; adding processing aids and well mixing the dissolution liquid into a dispersed phase; cooling the dissolution liquid to 42-80° C., and adding a second solvent to generate PPE microspores via PPE to wrap around the processing aids; cooling the dissolution liquid to 0-40° C. to obtain PPE microspore dispersions for use in application for impregnation processes performed below 40° C., thereby high-temperature impregnation equipment are no longer needed, and copper clad laminates made of using the PPE microspore dispersion enjoy excellent physical properties including high Tg, low Dk, low Df and high copper foil's peel strength.

Abstract: A process for producing polyphenylene ether involves to keep a combustible solvent at a gaseous concentration below the minimums of explosion, to keep oxygen gas supplied at a gaseous concentration below the limiting oxygen concentration (LOC) of the solvent, and to make use of a reactor having a rotary-sealed mixer sealed with magnetic rotary feedthroughs to prevent static electricity generated, and then to improve safety and yield thereof.

Abstract: A process for producing polyphenylene ether involves to keep a combustible solvent at a gaseous concentration below the minimums of explosion, to keep oxygen gas supplied at a gaseous concentration below the limiting oxygen concentration (LOC) of the solvent, and to make use of a reactor having a rotary-sealed mixer sealed with magnetic rotary feedthroughs to prevent static electricity generated, and then to improve safety and yield thereof.

Abstract: A method for preparing esters of cyclohexane polycarboxylic acids from esters of benzene polycarboxylic acids makes improvement to hydrogenation of esters of benzene polycarboxylic acids by using a reaction tank having a gas-introducing mixer capable of extracting and exhausting air and stirring to hydrogenate an ester of a benzene polycarboxylic acids into an ester of a cyclohexane polycarboxylic acid in the presence of a hydrogenation catalyst; resulted in that the method advantageously minimizes the operational pressure for hydrogenating esters of benzene polycarboxylic acids and significantly lowers the reaction temperature for hydrogenation while effectively improving the yield of esters of cyclohexane polycarboxylic acids made from the esters of the benzene polycarboxylic acids.

Abstract: A method for making a hindered phenolic antioxidant based on Octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate uses a methanol solution containing alkali metal methoxide as a catalyst solution, wherein the catalyst solution is filtered with a filter device with a filter pore diameter of less than 50 ?m to remove insoluble matters therefrom before used in a transesterification process where methyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate and 1-Octadecanol are taken as reactants to obtain a crude product of Octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate having high conversion rate and low color, and the crude product further undergoes a purification process for crystallization, filtering and drying to obtain a product of Octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate having high purity and low color.

Abstract: A hydrogenation process for hydrogenating bisphenol-A-based epoxy resin under low-temperature, low-pressure conditions includes using a hydrogenation reactor that has a gas-distributing agitator functional to introduce and exhaust hydrogen gas and stir liquid reactant, so that hydrogen gas introduced into the hydrogenation reactor can be evenly distributed into a liquid reactant placed into the hydrogenation reactor to make the liquid reactant contain a high level of dissolved hydrogen, which not only enhances activity of an involved hydrogenation catalyst and accelerates hydrogenation reaction, but also allows hydrogenation reaction to be performed in a low-temperature, low-pressure environment. The hydrogenation process improve yield of the hydrogenated bisphenol-A-based epoxy resin to 99.0-99.9%, while significantly reducing building and maintaining costs for the hydrogenation reactor, thus being an economic process.

Abstract: A method for preparing esters of cyclohexane polycarboxylic acids from esters of benzene polycarboxylic acids makes improvement to hydrogenation of esters of benzene polycarboxylic acids by using a reaction tank having a gas-introducing mixer capable of extracting and exhausting air and stirring to hydrogenate an ester of a benzene polycarboxylic acids into an ester of a cyclohexane polycarboxylic acid in the presence of a hydrogenation catalyst; resulted in that the method advantageously minimizes the operational pressure for hydrogenating esters of benzene polycarboxylic acids and significantly lowers the reaction temperature for hydrogenation while effectively improving the yield of esters of cyclohexane polycarboxylic acids made from the esters of the benzene polycarboxylic acids.

Abstract: A hydrogenation process for hydrogenating bisphenol-A-based epoxy resin under low-temperature, low-pressure conditions includes using a hydrogenation reactor that has a gas-distributing agitator functional to introduce and exhaust hydrogen gas and stir liquid reactant, so that hydrogen gas introduced into the hydrogenation reactor can be evenly distributed into a liquid reactant placed into the hydrogenation reactor to make the liquid reactant contain a high level of dissolved hydrogen, which not only enhances activity of an involved hydrogenation catalyst and accelerates hydrogenation reaction, but also allows hydrogenation reaction to be performed in a low-temperature, low-pressure environment. The hydrogenation process improve yield of the hydrogenated bisphenol-A-based epoxy resin to 99.0-99.9%, while significantly reducing building and maintaining costs for the hydrogenation reactor, thus being an economic process.

Abstract: A method for making a hindered phenolic antioxidant based on Octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate uses a methanol solution containing alkali metal methoxide as a catalyst solution, wherein the catalyst solution is filtered with a filter device with a filter pore diameter of less than 50 ?m to remove insoluble matters therefrom before used in a transesterification process where methyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate and 1-Octadecanol are taken as reactants to obtain a crude product of Octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate having high conversion rate and low color, and the crude product further undergoes a purification process for crystallization, filtering and drying to obtain a product of Octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate having high purity and low color.