Abstract: The energy consumption of 200 kt/a sulfuric acid alkylation unit in SINOPEC Luoyang Company was analyzed, and the corresponding measures for energy saving and consumption reduction were put forward in view of the large energy consumption of steam, circulating water and desalinated water in the unit. Through optimizing the compressor speed, the flow rate of isobutane and n-butane removal column and feed process of light hydrocarbon removal column, the total saving of 3.5 MPa and 1.0 MPa steam was 11.75 t/h and 5.32 t/h, respectively. The steam energy consumption was reduced by 3 334.09 MJ/t. By shutting down the circulating water supply of some sampler and cooler and adjusting the water consumption of each equipment in time, the circulating water quantity was saved by 119.55 t/h, and the energy consumption was reduced by 16.63 MJ/t. Through the adjustment of the desalinated water used in the washing of air cooler, alkline tank and all pumps, the demineralized water was saved by 1.58 t/h. Through the implementation of the above energy saving measures, the total energy consumption for the unit was reduced by 3 354.38 MJ/t, and the economic benefit was 34.0947 million Yuan/a

Key words: sulfuric acid alkylation, steam, circulating water, desalinated water, saving energy and reducing consumption