反应详情

To 135 parts of the above-prepared polyester, 110 parts of a concentrated hydrochloric acid was added, and the resulting mixture was heated to 80° C. to decompose the polyester. The resulting mixture was separated by filtration, and was washed to yield 123 parts of a crude sorbic acid. A sodium hydroxide aqueous solution was added to the crude sorbic acid to yield a sodium sorbate aqueous solution, and to the solution 6 parts of active carbon was added, and the resulting mixture was stirred for 30 minutes. The mixture was filtrated to remove the active carbon, and a neutralization amount of a concentrated hydrochloric acid was added to the filtrate and the mixture was cooled to precipitate sorbic acid. The precipitated sorbic acid was separated by filtration, was washed, and was dried in vacuo to yield 114 parts of sorbic acid. The yield of sorbic acid was 84.7% on the basis of the polyester.