Takeda Chemical Industries, Inc.

Takeda Chemical Ind., Ltd.

Katsuhiko Ogino

Yoshio Kamatani

Hisayoshi Okazaki

Yoshio Yamazaki

Ko Imai

Noriaki Fujita

Itsuo Furuoya

Atsuo Kobayashi

A solid catalyst comprising (1) silver ion, (2) aluminum oxide and (3) silicon oxide, which may further comprise, as the fourth ingredient(s), the oxide and/or ion of one or more of transition elements, alkaline earth metals, boron, thallium, tin, lead and phosphorus gives a high yield of isoprene in the reaction of isobutylene and formaldehdye and has a prolonged catalytic activity.

Catalyst for the production of isoprene

Calcium cis-epoxysuccinate whose average particle size is not larger than 100 micron is converted into calcium L(+)-tartarate by a microorganism in a high concentration and in a better yield. This process is accelerated in the presence of a nonionic type surfactant of the medium.

Method for producing L(+)-tartaric acid

Calcium cis-epoxysuccinate is converted into calcium L(+)-tartarate by a microorganism in a high concentration and is a better yield. This process is accelerated in the presence of a nonionic type surfactant of the medium.

Production of L(+)-tartaric acid

L(+)-tartaric acid is produced in a high efficiency from cis-epoxysuccinic acid by a microorganism belonging to the genus Pseudomonas, Agrobacterium or Rhizobium.

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Osaka, Japan

Katsuhiko Ogino