The paper studied the synthesis of allontoin with glyoxaic acid,urea and filter liquor.Mixed acid as the catalyst,vacuum distilling condensation,the yield could be 53.1%.

 
  • 采用乙醛酸、尿素和回收滤液为原料,混酸为催化剂,经真空蒸馏缩合制得尿囊素。收率达53.1%25。
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