摘要：Much attention has been paid for the synthesis of dimethyl carbonate(DMC) by urea indirect alcoholysis method, which had not been actually industrialized by now. The rigorous full process model was then necessary to optimize the process with heat integration. In this paper, a full process was designed and optimized for the DMC synthesis by urea indirect alcoholysis method based on Aspen Plus *** technological analysis was developed to find how the process was influenced by the three main recycled materials of methanol, 1,2-propylene glycol(PG) and mixture of DMC–methanol. Simultaneously,the thermal optimization was taken into account for energy saving and the optimized process was proposed with heat integration. Moreover, the economic evaluation was implemented for the optimized process with total annualized cost(TAC) and cost of product(COP) according to the plant investment and operations. It was found that the 11.6% decrease in TAC was obtained for the optimized process compared to the original designed process. The COP analysis showed that the process was economically efficient for the production of DMC from urea and methanol.

摘要：针对燃煤电厂烟道气,以PEHA型(R_1HMS_3-PEHA_(80))胺基吸附剂为基础,设计了一套CO_2捕集量为20 kt/a的固定床变温吸附工艺,通过投资成本和运行成本的计算对设计的工艺进行了经济性评价,并研究了吸附剂各性能参数和有效捕集能力对再生能耗和捕集成本的影响。实验结果表明,工艺总再生能耗为2.26 GJ/t(基于CO_2捕集量),比胺溶液吸收法再生能耗降低了30.7%;捕集成本为341.0元/t(基于CO_2捕集量),比胺溶液吸收法降低了13.5%;在工艺总捕集成本中,运行成本是主要组成部分,所占比例高达91.2%;在运行成本中,蒸汽成本所占比例为66.2%,是工艺运行中的最大消耗。参数分析结果显示,吸附剂的吸附热对再生能耗的影响最大;有效捕集能力和吸附热对捕集成本的影响最大。

摘要：以氯化钙为钙源,硝酸锌为添加剂,与二氧化碳鼓泡碳化反应制备碳酸钙,探究了各因素对鼓泡碳化法制备碳酸钙的影响,运用单一因素变量法对鼓泡碳化法做了优化。利用XRD,SEM研究了氨水含量、CO_2流量、碳化温度、碳化时间、硝酸锌添加量对碳酸钙形貌、结构的影响及机制。结果表明,当氨水体积分数为2.4%、CO_2流量为180mL/min、碳化时间为30min、碳化温度为30℃、硝酸锌添加量为0.002mol时,可制得形貌为球形,且为单一晶型、结晶完善的碳酸钙颗粒。并设计了正反滴实验,验证并完整提出了CaCl_2-CO_2-CaCO_3体系中碳化反应作用机理。