Production method for preparing epsilon-caprolactone solution by using novel dehydrating agent

Abstract

The invention relates to a production method for preparing an epsilon-caprolactone solution by using a novel dehydrating agent; the production method comprises the specific steps: taking one of organic solvents butyl acetate, cyclohexane and ethyl propionate as a dehydrating agent, taking a Mg / Sn / W composite oxide as a catalyst, and oxidizing acetic acid by using hydrogen peroxide to obtain a peracetic acid solution; then adding cyclohexanone to the peracetic acid solution; and after completion of the reaction, cooling the reaction to room temperature, and thus obtaining the epsilon-caprolactone solution. The method provided by the invention can reduce water as far as possible before caprolactone is produced, so as to avoid the polymerization of caprolactone and improve the yield.

Description

Technical field [0001] The present invention uses a new type of dehydrating agent to prepare caprolactone. The method uses butyl acetate as the dehydrating agent, Mg / Sn / W composite oxide as the catalyst, and the peroxyacetic acid solution is prepared by oxidizing acetic acid with hydrogen peroxide. Caprolactone is prepared by adding hexanone to the peroxyacetic acid solution. Background technique [0002] At present, the global production capacity and demand for ε-caprolactone are growing rapidly at an average annual rate of about 6%. In 2011 alone, the global market demand for ε-caprolactone has exceeded 50,000 tons. According to customs statistics, In 2010, the domestic import growth rate of ε-caprolactone reached 41.9%, compared with 53.2% in 2011. At the same time, the domestic price of ε-caprolactone has been rising continuously with the tight supply and demand relationship. [0003] Commonly used at home and abroad H 2 O 2 Two-step synthesis of ε-caprolactone. In this produ...

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Problems solved by technology

[0003] Commonly used H at home and abroad 2 o 2 Two-step method to synthesize ε-caprolactone. In this production process, the by-product water cannot be completely removed, which in turn triggers the self-polymerization reaction of ε-caprolactone to generate PCL with a low degree of polymerization, and its content accounts for 10% of the total output of ε-caprolactone. About 30%, however, its polymerization is too low, its shape is irregular, its performance is unstable, and its commercial value is not high, so it is of great significance to choose a suitable dehydrating agent

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