| 摘要 |
FIELD: organic chemistry, chemical technology. ^ SUBSTANCE: invention relates to a method for preparing 1,4-naphthoquinone that is used in medicine in producing vitamin K and different industrial catalysts. Method is based on isolation of 1,4-naphthoquinone from waste in phthalic anhydride manufacturing wherein these waste are diluted with scrubber liquid and stirred. Mixture is heated up to the complete dissolving phthalic acid and distillation of 1,4-naphthoquinone is carried out at temperature 90-110°C with feeding live steam. Prepared vapor-like phase is cooled up to crystallization of 1,4-naphthoquinone followed by filtration of its aqueous solution and the following drying of the ready product by indirect heating. Method provides utilization of waste and preparing 1,4-naphthoquinone of the high purity degree. ^ EFFECT: improved preparing method. ^ 2 tbl |
