基于Aspen Plus的氯气干燥工艺模拟分析

采用Aspen Plus流程模拟软件对某电解装置氯气干燥工艺流程进行了模拟计算,模拟结果与设计数据基本一致。为提高装置的经济效益,采用Aspen Plus流程模拟软件对氯气干燥装置氯气洗涤塔和硫酸洗涤塔工艺参数进行了模拟分析。该优化不涉及设备改造,仅通过改变工艺参数实现。模拟及分析结果显示：降低氯水循环量、提高氯水循环温度、降低氯气冷却器温度,可节约运行成本。     

一种新型多效四塔精馏甲醇工艺流程研究

提出一种新型多效四塔精馏甲醇工艺,采用热集成技术,用加压塔塔顶蒸气和中压塔塔底部分液体换热,中压塔塔顶蒸气和常压塔塔底部分液体换热,有效利用冷热流,形成两个双效精馏。通过PRO/Ⅱ化工模拟计算软件对流程进行稳态模拟和分析,对操作参数进行优化。结果表明：甲醇四塔多效工艺方案合理,产品质量优良,流程操作稳定,能源消耗显著减小,具有良好的社会意义。     

低温甲醇洗PSRK热力学方程改进与全流程模拟

低温甲醇洗工艺广泛应用于酸性气体净化,但在Aspen Plus软件中,软件自带的热力学方程不能准确模拟该流程。为了提高热力学方程计算的精确度,文中首先使用Aspen Plus软件内置的PENG-ROB,PK-ASPEN,PSRK热力学方程,模拟低温甲醇洗工艺中的脱硫塔和脱碳塔。模拟结果表明:这3个方程的模拟结果和实际数据均存在差距,但PSRK方程的模拟结果和实际数据最接近。在此基础上,文中修正了PSRK方程中部分二元交互作用参数,修正后的PSRK方程能够准确模拟脱硫塔和脱碳塔,关键流股中关键组分的模拟结果与实际数据吻合良好。另外,为了增加模拟的实用性,文中设置了撕裂流股和收敛模块,模拟了低温甲醇洗全流程,为低温甲醇洗流程的设计计算提供了可靠的技术支持。     

连续精馏分离氰乙酸甲酯工艺

针对氰乙酸甲酯传统的间歇精馏分离过程,提出了连续精馏分离氰乙酸甲酯的三塔、四塔和五塔工艺流程,并对3种分离流程进行工艺分析,确定了连续精馏五塔分离工艺.利用ASPEN PLUS软件中的RADFRAC精馏模型和WILSON方程对五塔精馏分离流程进行优化模拟计算,得到了该流程的最佳工艺操作参数及相关的设备参数.生产数据表明,与目前普遍采用的间歇精馏工艺相比,能耗降低了近30%,产品收率提高了2.4%,为氰乙酸甲酯的连续分离开辟了一条新的工艺技术路线.     

DMF萃取精馏法分离丁二烯的工艺流程模拟

利用ASPEN PLUS化工流程模拟软件,对DMF法丁二烯装置中的第一萃取精馏塔进行了模拟,与实际生产装置的工艺参数对比表明:模拟计算的结果是准确的。根据模拟计算的结果,分析了溶剂烃比、回流比、溶剂进塔温度等工艺参数对分离过程的影响,并提出了优化的工艺条件。     

乙醇、二氧六环、甲醇和水的共沸精馏模拟

针对含有甲醇和二氧六环的乙醇-水体系,提出采用共沸精馏两塔流程的方法实现脱水,选择环己烷为共沸剂,分析了体系中各组分间的共沸特点,利用流程模拟软件Aspen plus对流程进行模拟计算。结果表明,采用两塔流程的方法可以将进料中的水脱除到0.05%(质量分数)以下,进料中的甲醇可从回收塔塔釜排出,模拟结果与实际工业数据基本吻合。     

合成氨一段转化炉增湿烟气工艺模拟

利用流程模拟系统对某大型合成氨企业的节能减排技改项目--一段转化炉增湿烟气余热回收工艺进行了模拟分析.该工艺在原流程的基础上,通过增加饱和增湿塔,利用尿素水解废液增湿原料天然气,大幅降低了一段转化炉排烟温度,达到节能减排的目的.计算结果显示:采用该工艺可节约中压工艺蒸汽14t/h;模拟计算结果与实施后的现场实测数据基本...     

合成氨装置甲醇洗净化工艺模拟计算的研究(Ⅳ)

<正> 4115C4和4115C5塔模拟计算 在甲醇洗工艺中,脱除了CO_2和H_2S的气体送到氮洗塔进一步净化,而吸收剂经4115C2和4115C3两个塔解吸CO_2后,最终要再生分离以循环使用。4115C4塔便是甲醇再生塔,4115C5塔为甲醇-水分离塔。这两个塔是典型的精馏塔,本文用泡露点法圆满地解决了这两个塔的模拟计算。 根据某厂工艺设计,为了计算机程序的     

用MH-81′状态方程模拟液氮洗涤塔

本文采用MH-81′状态方程和与密度无关的局部组成型混合法则,从二元汽-液平衡数据得到的二元相互作用参数,预测了部分液氮洗过程中的二元体系的混合焓,结果满意。采用三对角矩阵方法,对两种不同工况的液氮洗涤塔进行了模拟,计算结果与设计值和实测值符合较好。     

乙醇胺精馏过程五塔流程模拟分析

用ASPEN11.1化工流程模拟软件,对乙醇胺分离工艺中的蒸氨塔、脱水塔、一乙醇胺塔、二乙醇胺塔、三乙醇胺塔进行了模拟计算,采用非随机双液体(NRTL)热力学计算模型,并进行了热力学参数修正,通过调整各塔的理论板数、进料位置和回流比,以及后二塔的塔顶回路质量流量等操作参数,得出各塔的最佳工艺条件。在最佳工艺条件下,分析了此分离过程的能耗问题。模拟结果表明:五塔流程分离得到的乙醇胺均能达到产品质量要求,工艺流程合理、可靠,对工程设计和工艺操作具有较强的指导作用。     

壳聚糖-聚乳酸接枝共聚物多孔支架制备

天然聚合物壳聚糖,生物可降解材料聚乳酸,都有着良好的生物相容性,在生物医学领域有着广泛的用途。但是,壳聚糖与聚乳酸各自的性能缺陷导致了这两者单独使用有着很大的局限性。为了改善这两者的缺点,可以利用将聚乳酸接枝共聚到壳聚糖主链上。这样既可以改善壳聚糖不易于加工的缺点,而壳聚糖本身碱性多糖的结构也可以中和乳酸降解过程中所产生的酸性。本文介绍了壳聚糖-聚乳酸接枝共聚体系的制备方法。     

二甲醚-甲醇体系二元交互参数的拟合与评价

本文通过化工模拟软件AspenPlus,液相采用NRTL模型,气相采用PR方程,对二甲醚-甲醇二元体系进行汽液平衡计算时涉及到的二元交互作用参数进行了研究。首先分别选用AspenPlus自带的三个数据库VLE—LIT、VLE—RK和VLE—HOC中二元交互参数进行计算,结果表明,选用数据库VLE—ILK和VLE—Hoc中模型参数时,计算值与实验值吻合较好,并且数据库vLE—RK的计算结果更好。其次利用文献实验数据拟合参数,进行气液平衡计算,与实验结果对比表明本文拟合参数最为适合,即对NRTL模型：a12=1．486,a21=-1．1496,b12=-28．06,b21=194．7,C12=0．0172;PR方程：k12=k21=-0．0605。     

Models describing the behavior of new carbon fiber packings inn rectification processes

Many rectification processes are used to separate corrosive substances with high boiling points. This reports deals with a new type of structured column pacing mode of corrosion-resistant carbon fiber material. These column internals allows for low pressure drop at high throughput rated with reasonable column efficiency. Experiments in columns of 50 and 100 mm diameter have been carried out to investigated separation efficiency, pressure drop and liquid holdup of the packing even at low operation pressures. In the respective columns twp geometrical different types of packing have been tested using binary mixtures of chlorobenzene/ethylbenzene with a packing geometry similar to the Sulzer EX packing, the 100 mm diameter column was filled with elements of rougher structure and smaller specific surface. Basing on the experimental results, model equations are presented, which allow the calculation of the investigated performance characteristics.     

A multi-fluid nonrandom lattice fluid model: Mixtures

A multi-fluid nonrandom lattice fluid model with no temperature dependence of close packed volumes of a mer, segment numbers and energy parameters of pure systems and its consistent method for phase equilibrium calculation were presented in the previous paper. In this work, the model was extended to mixtures by using consistent method for phase equilibrium calculation with fugacity coefficients derived from the present equation of state and it was applied to vapor-liquid equilibrium. We consistently tested the present model on 17 phase equilibrium data sets of vapor-liquid equilibria and compared it with the MF-NLF model and the SAFT model. The present model (3 pure parameters for pure component and one binary interaction parameter) showed better results for most systems than the MF-NLF model (6 adjustable pure parameters and one binary interaction parameter) and the SAFT model (3 pure parameters and one binary interaction parameter).     

ASPEN PLUS在氯碱工程设计中的应用—氯氢处理流程模拟开发

ASPENPLUS 10 .0版中有较为全面的气液平衡回归出来的二元交互作用参数 ,文中主要介绍了用该流程模拟软件对离子膜烧碱氯氢处理工序进行物料平衡和热量平衡的计算 ,并与工厂实际数据进行比较 ,获得满意的结果。     

Industrial application of an extended fully thermally coupled distillation column to BTX separation in a naphtha reforming plant

Aromatic compounds are yielded from naphtha reforming in a petrochemical plant, and the products are separated with binary distillation columns for benzene, toluene, xylene and heavy components in sequence. In this study, the first three columns of the fractionation process in the naphtha reforming unit are replaced with an extended fully thermally coupled distillation column (EFTCDC) also known as the extended Petlyuk column. An industrial-sized application of the EFTCDC is examined to compare the performance of the column with a conventional system. From a structural design giving the optimum structure of the column, a practical column structure is derived and used in the HYSYS simulation to find the optimal operation condition for a given set of product specifications. The EFTCDC gives an energy saving of 9.7% over a conventional three-column process. In addition, it is proved that the design procedure is good for an industrial process of 18 components.     

Hybrid Simulated Moving Bed Processes for the Purification of p‐Xylene

Abstract

A parallel two‐zone and four‐zone SMB hybrid process was developed for p‐xylene purification. By placing a high‐productivity parallel two‐zone SMB in front of an existing four‐zone SMB, feed was enriched in the parallel two‐zone SMB before it was fed to the four‐zone SMB, which allows a higher feed rate to the four‐zone SMB. A general design procedure for hybrid SMB‐SMB process was developed. Simulations were done with Aspen Chromatography and Aspen Plus. Overall adsorbent productivity was increased by more than 100%, but with 3–5% lower overall p‐xylene recovery. With overall recovery of the hybrid process matching the base case, the feed rate was doubled and the overall adsorbent productivity was 50% higher than the base case. The heat duties of distillation columns per unit product were similar for these hybrid processes compared to the base case. If a two‐feed raffinate distillation column was used, the heat duty of distillation columns per unit product in the hybrid process was 2–4% lower than the base case. Both parallel two‐zone and four‐zone SMBs were also developed for use in a hybrid SMB‐crystallization process for p‐xylene purification. SMB productivity can be increased from 31% to 75% by adding additional pumps between columns to operate columns at their pressure limits. Although additional pumps are useful for both systems, the productivities of the parallel two‐zone SMBs were 9% and 16% higher than the corresponding four‐zone SMBs with the same number of recycle pumps. For a four‐zone SMB with two columns per zone and eight recycle pumps, a 114% increase of productivity was achieved, which is 22% higher than a parallel two‐zone with one column per zone and four recycle pumps.     

Recommended operating range for a rotating disc contactor

Influences of different parameters on diameter and height of RDC column and on mass transferred from unit column volume were investigated. The results of the calculation can assist designers in making proper choice for the operating range of RDC columns.     

二元交互参数化PC-SAFT在超临界乙烯配位聚合体系相平衡计算中的应用

超临界烯烃配位聚合技术是近年来国际聚烯烃工业领域中的重要进展之一,超临界体系相平衡计算则是该聚合工艺设计与优化操作的基础。本文以链扰动统计缔合流体理论（PC-SAFT）状态方程描述工业级超临界乙烯配位聚合体系的相平衡,得到了适用于该复杂体系的PC-SAFT二元交互参数。与公开报道的实验数据比较表明,获得的二元交互参数可准确描述该超临界体系在较宽温度、压力范围的相平衡。基于上述二元交互参数,针对2个不同双峰聚乙烯产品牌号,计算了工业装置内多组分的相平衡状态,结果表明,反应器内的[H₂]/[C₂H₄]摩尔比、淤浆密度的计算值与工业数据吻合较好,验证了二元交互参数的适用性。研究结果为进一步的工艺流程模拟与优化奠定了基础。