【摘 要】
：
4-nitrochlorobenzene and 2-nitrochlorobenzene are important raw materials for the chemical industry.The present actual production condition,4 main production methods of them in China and abroad are zo
【机 构】
：
College of Chemical Engineering,Beijing University of Chemical Technology,Beijing,100029,China
【出 处】
：
The 6th International Conference on Separation and Technolog
论文部分内容阅读
4-nitrochlorobenzene and 2-nitrochlorobenzene are important raw materials for the chemical industry.The present actual production condition,4 main production methods of them in China and abroad are zones melting process,stepped crystallization process,catalytic hydrogenation method and dynamic crystallization process.Recently,many types of column crystallizers have been used in order to separate and purify organic compounds in chemical industries.And its process is continuous multistage countercurrent fractional crystallization.That is a new and potential technique for separation and purification,and the evolvement of exploitation work in foreign countries has been rather active in recent years.The principle of colunm crystallization is based on the use of a tower crystal container operated in a continuous multistage countercurrent mode,which makes effective contacting and mass transport between the crystals and melt possible [1-3].Compared with stepped crystallization process and the dynamic crystallization,it has many advantages,not only it has higher separation efficiency,lower energy consumption,fewer investment for equipment and higher product purity,but also it deals with the difficulty for distillation to separate the azeotropic and thermo sensitive mixtures.Australia [4] has been developed Brodie crystallizer to purify 4-nitrochlorobenzene and 2-nitrochlorobenzene.
其他文献
通过调整原料沥青的组成及控制中间相转化过程,宝钢化工实现了在一条延迟焦化生产线上可切换生产同性焦、沥青焦、针状焦三种煤沥青基碳素产品.由于其各具独特的微观结构和宏观性质,而广泛应用于特种石墨、石墨电极、锂离子电池负极材料等领域.特别是同性焦以其均匀、独特的显微结构和类球形颗粒形态可简化特种石墨生产工艺流程,显著降低生产成本.
针对现有陶瓷管过滤器除油效果不持续的问题,对比几种传统的处理形式,引入纤维床两相分离器对剩余氨水进行处理,取得良好效果.现场环境得到改善,可实现自动化控制,劳动强度明显降低.
近年来,尽管甲醇合成催化剂的研发在不断进步,其活性逐渐增加,甲醇合成塔的结构也在不断改进,但是,在甲醇实际的生产过程中,甲醇合成中CO和C02的单程转化率还是远远小于平衡转化率.为了进一步提高CO和C02的转化率和合成过程的推动力,甲醇分离技术的改进已经成为了必然,低压甲醇分离装置的作用就是抛开了常规思维中的仅仅考虑液态甲醇的分离效果,更着眼于液态、气态甲醇的进一步分离和回收.在经济效益、节能降耗
在神华乌海能源有限责任公司对技术创新工作的大力推进下,西来峰甲醇厂针对焦炉气中杂质较多的问题进行研究后,经过自主研发,设计了焦炉气压缩机入口过滤器在线清洗装置和焦炉气压缩机冷却器清洗装置.通过两套装置的使用,很大程度上解决了焦炉气中带有较多杂质造成的焦炉气压缩机入口压力低与出口温度高的问题,应用效果良好.
通过对山东潍焦集团薛城能源有限公司焦炉煤气制LNG生产系统自2015年9月投产运行后所暴露出煤气处理净化单元存在制约生产的过滤器堵塞和预加氢催化剂短期使用失活的问题的原因分析,提出技改措施.
In this study,a volumetric method was used to measure the adsorption/desorption isotherms [1].The free volume (void volume) of the adsorption cell excluding adsorbents was measured at room temperature
针对山西焦化股份有限公司甲醇厂配套环保设施存在的缺陷,分析原因并制定升级改造措施,有效解决了问题,提高并优化了环保设施的运行水平,确保了现场污染物的达标排放,取得了环保效益和经济效益的双丰收.
The PSA process is one of the potentially viable options for CO2 capture from large CO2 generating sources.It is generally known that a two-stage PSA process is required to recover 99% CO2 from flue g
Enantiomer separation is one of the most important prerequisites for the investigation of environmental enantioselective behavior for chiral pesticides [1-2].In the present study,HPLC is one of the mo
The extraction of caffeine from Korean green tea was performed by various extraction methods such as dipping,stirring,ultrasonic and supercritical CO2 extraction.The extracts were analyzed by reversed