探索醋酸乙烯生产工艺优化提高副产品乙醛收率

四川维尼纶厂乙炔法醋酸乙烯工艺流程净化工段存在乙醛收率低、萃取负荷重的难题。在理论分析的基础上,采用流程模拟方法对VAc脱轻组分系统进行了数值计算,确定了乙醛跑损的主要位置。模拟结果与实际生产数据吻合良好。研究结果表明,二级、三级冷凝器效率低、萃取塔操作条件不理想是影响VAc精馏工序平稳运行的主要因素。提出了工艺改进方案,并进行了流程模拟。现场初步运行结果表明,采用优化后的流程和操作参数后,乙醛收率大于80%。

醋酸乙烯精馏异常诊断和生产优化

针对醋酸乙烯精馏过程控制存在的主要问题,提出一种用于DCS平台的异常诊断和生产优化方法。该方法基于大量的运行数据和丰富的操作经验,通过程序设计并用于DCS平台实现对醋酸乙烯精馏过程的异常诊断和生产优化。采用该方法后,醋酸乙烯精馏工艺参数平稳率提高、能耗降低,获得较好经济效益。

醋酸乙烯装置乙醛精馏塔中乙醛聚合原因分析及改造措施

研究了醋酸乙烯合成反应器换触媒后开车初期乙醛精馏塔D1运行恶化问题,发现生成的一种较强酸促使乙醛聚合生成三聚乙醛,三聚乙醛引起醋酸乙烯和水形成W/O型微乳而将水带至醋酸乙烯精馏塔,使醋酸乙烯水解生成乙醛,导致精醋酸乙烯产品中乙醛超标。进一步深入探讨了这种强酸的可能种类是盐酸或丙炔酸。采取在D1进料中加碱中和酸从而破坏乙醛发生聚合反应的条件,防止该塔堵塞,减少带到醋酸乙烯精馏塔中的水量,确保精醋酸乙烯产品中乙醛含量达标。

Steady State Simulation of a Novel Process for the Co-production of Vinyl Acetate and Acetic Acid

A new process for the co-production of vinyl acetate monomer and acetic acid from ethane feedstock was studied. Various configurations were proposed and simulation results were given for each case to optimize process variables. This new process offers an overall yield values above 70% with minimum separation steps involved and the possibility of utilities integration. The process does not involve any CO production, thus becoming environmentally more favorable. The initial capital investment of the proposed process is much lower compared to the conventional route.