scholarly journals Analysis of Different Pressure Thermally Coupled Extractive Distillation Column

2014 ◽  
Vol 8 (1) ◽  
pp. 12-18 ◽  
Author(s):  
Lanyi Sun ◽  
Kang He ◽  
Yuliang Liu ◽  
Qiuyuan Wang ◽  
Dingding Wang
Keyword(s):  
Sensitivity Analysis ◽  
Distillation Column ◽  
Extractive Distillation ◽  
Total Annual Cost ◽  
Operating Parameters ◽  
The Novel ◽  
Economic Aspects ◽  
Distillation Process ◽  
Aqueous Acetonitrile ◽  
New Process

In this contribution, a different pressure thermally coupled extractive distillation process has been applied on the separation of propylene and propane with aqueous acetonitrile (ACN) solution as entrainer. The novel distillation pro-cess integration is the combination of different pressure thermally coupled distillation (DPTCD) and extractive distillation (ED). Both the new process and the conventional process have been simulated in Aspen Plus. Sensitivity analysis has been conducted to select an appropriate compression ratio and other operating parameters based on the priority that the propylene product purity is 99.2 wt % and less energy consumption. The influence of the proposed distillation column on energetic and economic aspects is evaluated through intensive comparison against the conventional stand-alone column, and better performance is achieved with up to 46.02% energy saving and close to 9.7% saving in total annual cost (TAC).

scholarly journals Batch extractive distillation of mixture methanol-acetonitrile using aniline as a asolvent

2012 ◽  
Vol 14 (3) ◽  
pp. 48-53 ◽  
Author(s):  
Guangzhong Li ◽  
Yang Yu ◽  
Peng Bai
Keyword(s):  
Sensitivity Analysis ◽  
Distillation Column ◽  
Extractive Distillation ◽  
Energy Requirements ◽  
Minimal Energy ◽  
Distillation Process ◽  
Optimal Parameters ◽  
Vle Data ◽  
Simulation Results

Methanol and acetonitrile form a minimum azeotrope at 336.74 K, which contains methanol 76.89 mas%. The simulation and the experiment to separate the mixture by batch extractive distillation using aniline as entrainer is performed. Based on the experimental and simulative VLE data, aniline is chosen to be the suitable solvent. The sensitivity analysis about the number of stages, the refl ux ratio, the solvent feed stage and the solvent fl ow rate is conducted to obtain the optimal parameters and confi guration of the extractive distillation column with minimal energy requirements. The most appropriate confi guration is 30 theoretical stages. The optimal entrainer feeding stage is 8 with a solvent fl ow rate of 20kg/h and the refl ux ratio of 2.0, respectively. The simulation results show the effect of the main variables on the extractive distillation process. The experiment is carried out to corroborate the feasibility of the separation of methanol-acetonitrile by batch extractive distillation.

scholarly journals Process of separating acetonitrile and water using LTTMs as entrainer

2021 ◽  
Vol 23 (4) ◽  
pp. 1-9
Author(s):  
Chengshuai Li ◽  
Wencheng Ma
Keyword(s):  
Sensitivity Analysis ◽  
Glycolic Acid ◽  
Distillation Column ◽  
Molar Mass ◽  
Choline Chloride ◽  
Extractive Distillation ◽  
Separation Process ◽  
Ternary Mixtures ◽  
Acid Mixture ◽  
Consumption Energy

Abstract New extractive distillation configurations, which use low transition temperature mixtures (LTTMs) as entrainers, have attracted widespread attention among scholars due to their green processes. Furthermore, the design and comparison of different processes can promote the application of new solvents in the future. In this study, two extractive distillation processes, the extractive distillation column (ED) and the extraction dividing wall column (EDW), were selected from previous work. The separation process of acetonitrile (ACN)-water ternary mixtures was studied, and GC3:1(choline chloride/glycolic acid mixture (molar mass 1:3)) and EC2:1((choline chloride/ethylene glycol 1:2 molar mass) were used as entrainers. Minimum consumption energy and the purity of ACN and water were set as the goals, and our sensitivity analysis and economic evaluation results showed that both ED and EDW were effective. As a result, LTTMs can be used in extractive distillation for azeotrope separation.

New process for separating propylene and propane by extractive distillation with aqueous acetonitrile

2001 ◽  
Vol 84 (3) ◽  
pp. 581-586 ◽  
Author(s):  
Bo Liao ◽  
Zhigang Lei ◽  
Zheng Xu ◽  
Rongqi Zhou ◽  
Zhanting Duan
Keyword(s):  
Extractive Distillation ◽  
Aqueous Acetonitrile ◽  
New Process

Inferential Control of a Distillation Column Using an Online Estimator

2008 ◽  
Vol 3 (1) ◽  
Author(s):  
Vijander Singh ◽  
Indra Gupta ◽  
Hari Om Gupta
Keyword(s):  
Data Acquisition ◽  
Product Quality ◽  
Control Strategy ◽  
Distillation Column ◽  
Measurement Techniques ◽  
Data Acquisition System ◽  
Distillation Process ◽  
Present Scheme ◽  
Inferential Control ◽  
Control Scheme

The time to measure and maintain distillate quality in the presence of disturbances is the main objective of the distillation process. To maintain the product quality, a suitable tray temperature is kept constant with the help of a control strategy near its set point. As the controlled variables cannot be measured online easily due to measurement lags and sampling delays, the secondary measurement techniques are used to estimate the distillate quality by adjusting the values of manipulated variables (inferential control). This paper presents an inferential control scheme for a distillation column using an Ethernet-based data acquisition system to provide a standard online estimator. In the present scheme the distillation parameters are acquired from a client PC connected to the network and the distillate composition is estimated online by a developed ANN-based estimator. The above estimator is used for an inferential control strategy to control distillate composition. The inferential control scheme is exercised for various disturbances and the effect of the disturbances is observed on distillate quality.

New Process for Etherification of Glycerol with Isobutene

2015 ◽  
Vol 737 ◽  
pp. 33-37 ◽  
Author(s):  
Jing Jun Liu ◽  
Yong Yuan ◽  
Hang Zhang ◽  
Bo Lun Yang
Keyword(s):  
Distillation Column ◽  
Product Yield ◽  
Thermodynamic Study ◽  
Stirred Tank ◽  
Continuous Stirred Tank Reactor ◽  
Stirred Tank Reactor ◽  
Tank Reactor ◽  
New Process ◽  
Continuous Stirred Tank ◽  
Kinetic And Thermodynamic Study

A process was designed for etherification of glycerol with isobutene based on latest results of kinetic and thermodynamic study. A continuous stirred tank reactor was employed to carry out the reaction. Fresh glycerol was used to extract mono-ethers (ME) of glycerol in the reaction product and then returned to the reactor. Residual glycerol and ME were recovered by water washing and distillation. Isobutene and isobutene dimers were separated from high-ethers in a side draw distillation column. The new process was optimized, and a product yield of 97 wt% was obtained.

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