Dairen Chemical Corporation

Darien Chemical Corp.

June Yen Chou

Shien Chang Chen

Fu Shen Lin

Cheng Chang Chu

Ming Hui Chu

Hsing Yun Wang

Liang An Hsu

Ming Hsiung Shao

Nan Min Chen

Chine Chung Huang

Disclosed are a modified polyester fiber and a process for producing the same. The modified polyester fiber comprises the component of alkoxylated 2-methyl-1,3-propanediol and has the properties of easy dyeability at low temperatures and good colorfastness to laundering. The modified polyester fiber can be produced by undergoing a polymerization reaction of alkoxylated 2-methyl-1,3-propanediol, alkanediol, and terephthalic acid or an alkyl ester thereof, and then spinning. The modified polyester fiber can be dyed at low temperature and has excellent dyeability and colorfastness to laundering. Therefore, this modified polyester fiber can be widely used in the application of synthetic fiber product.

Modified polyester fiber and process for producing the same

The present invention is related to a method for preparing polyether polyol or copolymerized polyether polyol, which uses an acid catalyst consisting of heteropoly acidic salts and oxides and/or binders. It allows tetrahydrofuran and/or cyclic ether compounds to carry out the ring-opening polymerization or ring-opening copolymerization with/without telogen, and obtains polyether polyol or copolymerized polyether polyol. An acid catalyst is used in the present invention because of its low solubility in organic solvent, so its process is simpler and the catalyst is easy to recycle for repeated use. As well, its preparation process is highly advantageous.

Method for preparing polyether polyol and copolymer thereof

This invention is directed to a process for producing cyclic ethers by liquid phase reaction, which comprises using a crystalline aluminosilicate zeolite as the catalyst, and subjecting an alkanediol to cyclodehydration at a temperature less than the boiling point of the alkanediol to obtain the corresponding cyclic ether.

Process for producing cyclic ethers by liquid phase reaction

1,4-butanediol is prepared from allyl alcohol containing allyl acetate and water. The allyl alcohol is subjected to a hydroformylation reaction in the presence of an organic solvent, a rhodium complex, and a phosphorous compound under an atmosphere of carbon monoxide and hydrogen, to produce a hydroformylation product, which is extracted with an alkaline aqueous solution in the presence of carbon monoxide and/or hydrogen. After the extraction, an extracted raffinate solution containing the rhodium complex in the organic solvent is recycled through the same hydroformylation process, while the extracted aqueous solution containing the hydroformylation product is subjected to a hydrogenation reaction in the presence of hydrogen, with a hydrogenation catalyst added, to produce 1,4-butanediol.

Process for preparing 1,4-butanediol

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Kaohsiung, Taiwan

June Yen Chou