Asahi Kasei Chemicals Corporation

Asahi Kasei Kabushiki Kaisha

Hideki Date

Makoto Okamoto

Nobuyuki Uematsu

Akitake Nakamura

Teruyoshi Shimoda

Yasuhiro Nagato

Kenichi Yakigaya

The present disclosure is directed to provide a vinylsulfonic anhydride which is useful as a synthetic intermediate for synthesis of a fluorinated monomer. It is also directed to efficiently produce the vinylsulfonic anhydride. It is further directed to efficiently produce a fluorinated monomer using the vinylsulfonic anhydride. A vinylsulfonic anhydride of the present disclosure is expressed by the general formula (1). Further, a process for producing a vinylsulfonic anhydride of the present disclosure includes making a vinylsulfonic acid compound represented by the general formula (2) come in contact and be mixed with an anhydridization agent. Further, a process for producing a vinylsulfonyl fluoride of the present disclosure includes a step (b) of making a vinylsulfonic anhydride represented by the general formula (1) come in contact and be mixed with a fluorinating agent to prepare a reaction mixture including a vinylsulfonyl fluoride represented by the general formula (3) and a vinylsulfonic acid compound represented by the general formula (2).

Vinylsulfonic anhydride, method for producing same, and method for producing vinylsulfonyl fluoride

An object of the present invention is to provide a production process of an &#x3b1;-hydroxy acid having a sufficient quality as a polymer raw material, which process does not produce a large amount of waste as a byproduct and is economical. The present invention provides a production process of an &#x3b1;-hydroxy acid having a step of adding a basic metal to an &#x3b1;-hydroxy acid ammonium salt to yield an &#x3b1;-hydroxy acid metal salt and a step of desalting the &#x3b1;-hydroxy acid metal salt to yield the &#x3b1;-hydroxy acid.

Production process of &#x3b1;-hydroxy acids

A polycarboxylic acid mixture comprising 80% by weight or more of 1,3,6-hexanetricarboxylic acid, wherein the polycarboxylic acid mixture has a psychometric lightness L-value of 98 or more, a psychometric chroma a-value of from &#x2212;2.0 to 2.0 and a psychometric chroma b-value of from &#x2212;2.0 to 3.0, and has a nitrogen content of 5,000 ppm by weight or less.

Polycarboxylic acid mixture

Growing community of inventors

Tokyo, Japan

Hideki Date