Chung Shan Institute of Science and Technology

Shean-Jeng Jong

Chun-Hsu Lin

Chung-Chien Chang

Yu-Sheng Lin

Chang-Chih Lin

Chong Ma

Tseng-Rong Wu

Ming-Te Shih

Chung-Mou Liang

Chao-Chou Tu

Chao-chou Tu

Wang-Tsae Guu

A method and a device for purifying 1,4-bis(bromodifluoromethyl)benzene are disclosed. In order to solve the problem of hard to purify and separate 1,4-bis(bromodifluoromethyl)benzene crude products, diphenylmethane that has a higher boiling point and does not interact with 1,4-bis(bromodifluoromethyl)benzene is mixed with the 1,4-bis(bromodifluoromethyl)benzene crude products for evaporation. Afterwards, the purity of the vaporized product is detected and only that reaching an expected purity is collected to obtain high-purity 1,4-bis(bromodifluoromethyl)benzene.

Method and device for purifying 1,4-bis (bromodifluoromethyl) benzene

A method for purifying Piribedil includes mixing Piribedil solid having a purity of 98% by weight with water, boiling the mixture, adding slowly 95% ethanol to the boiling mixture to form a clear liquid, filtering the hot clear liquid, cooling the filtrate to obtain a white crystal having a purity of 99.8% by weight of Piribedil.

Method for the purification of Piribedil

A method of synthesizing a high purity product of &#x3b1;,&#x3b1;,&#x3b1;',&#x3b1;&#x2032;-tetrachloro-p-xylene is disclosed. The method includes carrying out a first stage reaction of terephthaldicarboxaldehyde with a mixture of SOCland dimethylformamide (DMF) to obtain a product mixture containing &#x3b1;,&#x3b1;,&#x3b1;&#x2032;,&#x3b1;&#x2032;-tetrachloro-p-xylene as a major product and 4-dichloromethyl benzaldehyde as a side product; adding SOCland DMF to the product mixture of the first stage reaction to undergo a second stage reaction; and to a cool water adding the resulting product mixture from the second stage reaction to obtain a solid product of &#x3b1;,&#x3b1;,&#x3b1;&#x2032;,&#x3b1;&#x2032;-tetrachloro-p-xylene with a purity of 90-99 mol %.

Method for the preparation of &#x3b1;,&#x3b1;,&#x3b1;',&#x3b1;&#x2032;-tetrachloro-p-xylene with high purity

A synthesis method of &#x3b1;,&#x3b1;,&#x3b1;',&#x3b1;&#x2032;-tetrachloro-p-xylene is disclosed. The method includes reacting terephthaldicarboxaldehyde with a mixture of SOCland dimethylformamide (DMF) to obtain a product mixture containing &#x3b1;,&#x3b1;,&#x3b1;&#x2032;,&#x3b1;&#x2032;-tetrachloro-p-xylene as a major product and 4-dichloromethyl benzaldehyde as a side product, which can be separated by silica column chromatography.

Method for the preparation of &#x3b1;,&#x3b1;, &#x3b1;',&#x3b1;&#x2032;-tetrachloro-p-xylene

A method for synthesizing a pentafluorophenyl acrylate polymer includes bulk polymerizing a pentafluorophenyl acrylate monomer in the presence of a free radical initiator. The reactant mixture was subjected to an ultrasonication treatment, so that the mixing of the initiator and the monomer is enhanced; carried out the bulk polymerization at 25-99&#xb0; C. for a period of time, and at 100-200&#xb0; C. under a vacuum pressure for another period of time to complete the bulk polymerization, so that residue amounts of the initiator, unreacted monomer and oligomer of the monomer are reduced in the resulting reaction mixture.

Method for the preparation of pentafluorophenylacrylate polymer

Ferrocenecarbonyl and toluene bromide are reacted in an ether solvent and in the presence of magnesium metal as a catalyst. The liquid portion of the reaction mixture is introduced into a silica gel column, wherein the weak acidity of the silica gel is able to dehydrate the reaction intermediate ferrocenyl alcohol product. The column is eluted with ethyl acetate/n-hexane, and after evaporating the solvent from the eluate collected, a purified ferrocenyl substituted styrene is obtained.

Method for the preparation of ferrocenyl substituted styrene

The method for preparing 2,2,3,4,4,4-hexafluoro-1-butanol includes reacting methanol and hexafluoropropene in the presence of a free radical initiator such as di-isopropyl peroxydicarbonate at 25-50&deg; C. and a pressure of 100-300 psi in an autoclave. An inert gas such as nitrogen and argon is added to the autoclave when the pressure is lower than 100 psi in the course of the reaction.

Method for the preparation of 2, 2, 3, 4, 4, 4-hexafluoro-1-butanol

A solvent-free, catalyst-free and contamination-free method of synthesis of polyimides is disclosed. The method includes polymerizing a diamine with 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA) at a pressure of 0.1-760 mm Hg, preferably a reduced pressure at about 36 mm Hg, and a temperature of 90-400&deg; C., preferably 10-240&deg; C.

Method of synthesizing polyimides

A compound capable of efficiently cutting off light in the near infrared region, copper (meth)acryloyloxyethyl phosphate coordination complex, is synthesized including reacting (meth)acryloyloxyethyl phosphate and copper acetate monohydrate in water.

Method for the preparation of copper (meth) acryloyloxyethyl phosphate coordination complex

Ferrocenaldehyde or ferrocenyl methyl ketone and allyl bromide are reacted in an ether solvent and in the presence of magnesium metal as a catalyst. The liquid portion of the reaction mixture is introduced into a silica gel column, wherein the weak acidity of the silica gel is able to dehydrate the reaction intermediate 1-ferrocenyl-3-buten-1-ol product. The column is eluted with n-hexane, and after evaporating the solvent from the eluate collected, a purified ferrocenyl-1,3-butadiene product is obtained.

Method for the preparation of ferroceny1-1,3-butadiene

A chlorotrifluoroethylene homopolymer is prepared by polymering chlorotrifluoroethylene monomers in an ester solvent and in the presence of t-butyl peroxypivalate as a radical initiator. The polymerization application can be carried at about 60&deg; C., and the resulting chlorotrifluoroethylene homopolymer has a number average molecular weight of about 1700.

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Tao-Yuan, Taiwan

Shean-Jeng Jong