Daicel

The enantiomeric excess of 3.10c has been determined by HPLC analysis using a Daicel Chiracel OD column and eluting with a 60 / 1 (v/v) hexane(HPLC-grade) / 2-propanol(p.a.) mixture. At a flow of 1 ml per minute the rentention times for the different isomers of 3.10c were 6.3 min. (exo, major enantiomer) 7.1 min. (exo, minor enantiomer) 7.7 min. (endo, major enantiomer) 10.7 min. (endo, minor enantiomer). 

Of these producers, Atochem, Degussa, and Daicel are reported to be in the merchant acrolein business. Union Carbide suppHes only the acrolein derivative markets. Rhc ne-Poulenc also produces acrolein, primarily as a nonisolated intermediate to make methionine. A number of other small scale plants are located worldwide which also produce acrolein as an intermediate to make methionine. 

Jptt Piit. 1,087,621 (1987), I. Takahashi andT. Sugano (to Daicel Chem. Ind.). 

Jpii Kokai Tokkyo Koho 58 125 718 (July 26,1983) (to Daicel Chemical Ind.). 

The world s manufacturers of aHyl alcohol are ARCO Chemical Company, Showa Denko K.K., Daicel Chemical Industries, and Rhc ne-Poulenc Chimie total production is approximately 70,000 tons per year. 

Jptt Kokai Tokkyo Koho 63 300,768 (Dec. 7, 1988) (to Daicel Chemical Industries, Ltd.). 

Although this process has not been commercialized, Daicel operated a 12,000-t/yr propylene oxide plant based on a peracetic acid [79-21-0] process during the 1970s. The Daicel process involved metal ion-catalyzed air oxidation of acetaldehyde in ethyl acetate solvent resulting in a 30% peracetic acid solution in ethyl acetate. Epoxidation of propylene followed by purification gives propylene oxide and acetic acid as products (197). As of this writing (ca 1995), this process is not in operation. 

The ketene—crotonaldehyde route through polyester with various modifications and improvements is reportedly practiced by Hoechst Celanese, Cheminova, Daicel, Ueno, Chisso, Nippon Gohsei, and Eastman Chemical Company. Differences in thein processes consist mosdy in the methods of polyester splitting and first-stage purification. Production of the potassium salt can be from finished sorbic acid or from a stream in the sorbic acid production route before the final drying step. Several patents on the process for producing sorbic acid and potassium sorbate from this route are given in the hterature. 

Manufacturing plants for thioglycolic acid and derivatives are found in Europe, the United States, and Asia. Producers in Europe are B. Bock (Germany), Elf Atochem (Erance), and Merck (Germany) in the United States Elf Atochem, Hampshire, and Witco and in Japan, Daicel. Production capacity is expected to be sufficient to supply world demand for five years. 

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