Nonsteady-state mathematical modelling of H2SO4-catalysed alkylation of isobutane with alkenes

IF 1.8 4区工程技术 Q4 ENERGY & FUELS

Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles Pub Date : 2021-01-01 DOI:10.2516/OGST/2021017

E. Ivashkina, E. Ivanchina, I. Dolganov, V. Chuzlov, A. Kotelnikov, I. Dolganova, R. Khakimov

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引用次数: 2

Abstract

H2SO4-catalysed isobutane alkylation with alkenes is an important industrial process used to obtain high-octane alkylate. In this process, the concentration of H2SO4 is one of the main parameters. For alkylation, sulphuric acid containing 88%–98% monohydrate is typically used. However, only a H2SO4 concentration of 95%–96% enables alkylate with the maximum octane number to be obtained. Changes in H2SO4 concentration due to decontamination are the main cause of process variations. Therefore, it is necessary to maintain the reactor acid concentration at a constant level by regulating the supply of fresh catalyst and pumping out any spent acid. The main reasons for the decrease in the H2SO4 concentration are accumulation of high-molecular organic compounds and dilution by water. One way to improve and predict unsteady alkylation processes is to develop a mathematical model that considers catalyst deactivation. In the present work, the formation reactions of undesired substances were used in the description of the alkylation process, indicating the sensitivity of the prediction to H2SO4 activity variations. This was used for calculation the optimal technological modes ensuring the maximum selectivity and stability of the chemical–technological system under varying hydrocarbon feedstock compositions.

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硫酸催化异丁烷与烯烃烷基化反应的非稳态数学模型

硫酸催化异丁烷与烯烃的烷基化反应是制备高辛烷烷烃的重要工业工艺。在此过程中，H2SO4的浓度是主要参数之一。对于烷基化，通常使用含有88%-98%一水化合物的硫酸。然而，只有当H2SO4浓度为95% ~ 96%时，才能得到辛烷值最高的烷基酸盐。净化引起的H2SO4浓度变化是工艺变化的主要原因。因此，有必要通过调节新鲜催化剂的供应和泵出任何废酸来维持反应器酸浓度在恒定水平。H2SO4浓度降低的主要原因是高分子有机物的积累和水的稀释。改进和预测不稳定烷基化过程的一种方法是建立考虑催化剂失活的数学模型。在本工作中，不需要的物质的形成反应被用于描述烷基化过程，表明预测对H2SO4活性变化的敏感性。利用该模型计算了在不同烃原料组成下保证化学工艺系统最大选择性和稳定性的最佳工艺模式。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles 工程技术-工程：化工

CiteScore

2.70

自引率

0.00%

发文量

审稿时长

2.7 months

期刊介绍： OGST - Revue d''IFP Energies nouvelles is a journal concerning all disciplines and fields relevant to exploration, production, refining, petrochemicals, and the use and economics of petroleum, natural gas, and other sources of energy, in particular alternative energies with in view of the energy transition. OGST - Revue d''IFP Energies nouvelles has an Editorial Committee made up of 15 leading European personalities from universities and from industry, and is indexed in the major international bibliographical databases. The journal publishes review articles, in English or in French, and topical issues, giving an overview of the contributions of complementary disciplines in tackling contemporary problems. Each article includes a detailed abstract in English. However, a French translation of the summaries can be provided to readers on request. Summaries of all papers published in the revue from 1974 can be consulted on this site. Over 1 000 papers that have been published since 1997 are freely available in full text form (as pdf files). Currently, over 10 000 downloads are recorded per month. Researchers in the above fields are invited to submit an article. Rigorous selection of the articles is ensured by a review process that involves IFPEN and external experts as well as the members of the editorial committee. It is preferable to submit the articles in English, either as independent papers or in association with one of the upcoming topical issues.