In this paper,the preparation of phenylpyruvic acid by hydrolysis of 5-benzalhydantoin and its dynamic behavior were studied. The optimized condition of hydrolysis was: reaction in the presence of sodium hydroxide as ...In this paper,the preparation of phenylpyruvic acid by hydrolysis of 5-benzalhydantoin and its dynamic behavior were studied. The optimized condition of hydrolysis was: reaction in the presence of sodium hydroxide as hydrolyte proceeding for two hours at 100?℃.The degradation of 5-benzalhydantoin was close to 100%.展开更多
In this work,the effect of alcohols (including alcohols containing single, two, three hydroxyl groups, respectively) on the enzyme- catalyzed synthesis of Z-L-Asp-PheOMe (ZAPM) is investigated by using a new technique...In this work,the effect of alcohols (including alcohols containing single, two, three hydroxyl groups, respectively) on the enzyme- catalyzed synthesis of Z-L-Asp-PheOMe (ZAPM) is investigated by using a new technique of enzymatic catalysis in a heterogeneous pseudo-eutectic solid-to-solid mixture with thermolysin.The experimental result shows that the alcohols containing two hydroxyl groups are the most suitable adjuncts for the studied enzymatic synthesis system, and the yield of ZAPM for 1,4-butanediol as an adjunct reaches 95% at reaction time 2?h, which is better than the results in two-phase systems and other pseudo-eutectic solid-to-solid mixture reported in literature.展开更多
The mixing-precipitation process for producing phenylpyruvic acid sodium salt(PPNa) by neutralization of phenylpyruic acid(PPA) with aqueous sodium hydroxide in a semi-batch stirred tank was studied.The effects of mix...The mixing-precipitation process for producing phenylpyruvic acid sodium salt(PPNa) by neutralization of phenylpyruic acid(PPA) with aqueous sodium hydroxide in a semi-batch stirred tank was studied.The effects of mixing characteristics and chemical characteristics on the precipitation process were investigated experimentally.It was found that the crystals growth rate and morphology obviously changed due to ripening.Crystal redissolution agglomeration and solvent inclusion also changed the purity of PPNa product considerably.展开更多
文摘In this paper,the preparation of phenylpyruvic acid by hydrolysis of 5-benzalhydantoin and its dynamic behavior were studied. The optimized condition of hydrolysis was: reaction in the presence of sodium hydroxide as hydrolyte proceeding for two hours at 100?℃.The degradation of 5-benzalhydantoin was close to 100%.
基金国家自然科学基金 (No .2 9976 0 19)江苏省自然科学基金 (No .BK9912 3)资助项目~~
文摘In this work,the effect of alcohols (including alcohols containing single, two, three hydroxyl groups, respectively) on the enzyme- catalyzed synthesis of Z-L-Asp-PheOMe (ZAPM) is investigated by using a new technique of enzymatic catalysis in a heterogeneous pseudo-eutectic solid-to-solid mixture with thermolysin.The experimental result shows that the alcohols containing two hydroxyl groups are the most suitable adjuncts for the studied enzymatic synthesis system, and the yield of ZAPM for 1,4-butanediol as an adjunct reaches 95% at reaction time 2?h, which is better than the results in two-phase systems and other pseudo-eutectic solid-to-solid mixture reported in literature.
文摘The mixing-precipitation process for producing phenylpyruvic acid sodium salt(PPNa) by neutralization of phenylpyruic acid(PPA) with aqueous sodium hydroxide in a semi-batch stirred tank was studied.The effects of mixing characteristics and chemical characteristics on the precipitation process were investigated experimentally.It was found that the crystals growth rate and morphology obviously changed due to ripening.Crystal redissolution agglomeration and solvent inclusion also changed the purity of PPNa product considerably.
