作业帮救命呀,导师老说我的英文摘要不好,
来源：学生作业帮 编辑：作业帮 分类：英语作业 时间：2024/05/26 02:46:04
救命呀,导师老说我的英文摘要不好,
咖啡因是我国重要的出口创汇原料药品种之一，在国内已有50多年的发展历史，主要合成工艺已基本成熟。亚硝化反应是以二甲脲法合成咖啡因中的重要一步，虽然经过不断地改进，但仍存在着原料消耗过多(亚硝酸钠过量15.73%、硫酸过量18.52%)、反应中产生的废气（每年需排放300吨左右的含氮废气）与废水处理负担过重等问题，对成本控制和无害化处理产生不利影响。本文通过合理设计实验方案，使用密闭反应容器进行反应，从而优化亚硝酸钠用量，使其过量率大大降低；同时结合将反应初始温度降到45℃等措施，使得亚硝化反应过程中排放的含氮废气量大为减少。优化后的亚硝化工艺可大幅度降低原料消耗、减少废水、废气排放量，具有重要的环保意义。
咖啡因是我国重要的出口创汇原料药品种之一，在国内已有50多年的发展历史，主要合成工艺已基本成熟。亚硝化反应是以二甲脲法合成咖啡因中的重要一步，虽然经过不断地改进，但仍存在着原料消耗过多(亚硝酸钠过量15.73%、硫酸过量18.52%)、反应中产生的废气（每年需排放300吨左右的含氮废气）与废水处理负担过重等问题，对成本控制和无害化处理产生不利影响。本文通过合理设计实验方案，使用密闭反应容器进行反应，从而优化亚硝酸钠用量，使其过量率大大降低；同时结合将反应初始温度降到45℃等措施，使得亚硝化反应过程中排放的含氮废气量大为减少。优化后的亚硝化工艺可大幅度降低原料消耗、减少废水、废气排放量，具有重要的环保意义。
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Caffeine is China's important export in China,one of the drug varieties of 50 years of development history,the main synthetic process matured.Nitrosation reaction is urea synthesis of dimethyl caffeine,although it is an important step to constantly improve,but there is still much raw material consumption (sodium nitrite 15.73% excessive 18.52%),sulfuric acid,reaction in excess of exhaust emissions to 300 tons each year (or nitrogen gas) and wastewater treatment burden,the cost control and free-pollution disposal adverse impact.Through the experiment,the rational design scheme using closed reaction containers,thus optimize sodium nitrite dosage,make its excessive rate is greatly reduced,Combining the initial temperature to 45 ° c,makes the nitrosation reaction process of nitrogen gas emission reduction.After the optimization of nitrosation technology can greatly reduce raw material cost,reduce emissions of wastewater,and has important significance to the environmental protection.
Caffeine is China's important export in China,one of the drug varieties of 50 years of development history,the main synthetic process matured.Nitrosation reaction is urea synthesis of dimethyl caffeine,although it is an important step to constantly improve,but there is still much raw material consumption (sodium nitrite 15.73% excessive 18.52%),sulfuric acid,reaction in excess of exhaust emissions to 300 tons each year (or nitrogen gas) and wastewater treatment burden,the cost control and free-pollution disposal adverse impact.Through the experiment,the rational design scheme using closed reaction containers,thus optimize sodium nitrite dosage,make its excessive rate is greatly reduced,Combining the initial temperature to 45 ° c,makes the nitrosation reaction process of nitrogen gas emission reduction.After the optimization of nitrosation technology can greatly reduce raw material cost,reduce emissions of wastewater,and has important significance to the environmental protection.
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