Faced with the problems of insufficient isobutane and lack of alkylation oil in the initial start-up of alkylation plant by sulphuric acid catalysis,the danger of"runaway temperature"will occur according to the traditional start-up standard.The simulation and sensitivity analysis of the reaction process were carried out by Aspen Plus software.The results showed that the maximum reaction temperature was 17 ℃ when the starting material contained 12.7％C4 olefin component.Therefore,a new start-up method of using n-butane to replace part of isobutane and all alkylated oil was put forward,which greatly reduced the requirements for start-up isobutane and alkylated oil,and a new"five step method"scheme for the initial start-up of the unit was established,making the initial start-up of the plant successful.The application results indicated that the new method was safe,reliable and stable,and had has a guiding significance for the initial start-up of alkylation units under non-standard conditions.
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