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制冷工程中常用制冷剂为氨、氟立昂等。在国外某油田联合站设计中，根据制冷要求选用正丁烷、异丁烷各占５０％的混合冷剂进行单级冷剂循环制冷。其特点为：有节能效果、混合冷剂的组成可以根据工况需要人为地调整、可降低节流过程的不可逆损失及增加制冷量、冷剂循环量少、经济效益高等。丁烷混合冷剂在油田气处理工程中是可行的，具有推广价值。
Refrigerants commonly used in refrigeration engineering ammonia, fluorine Leon and so on. In a foreign oilfield joint station design, according to the cooling requirements of the use of n-butane, isobutane accounted for 50% of the mixed refrigerant single-stage refrigerant circulation refrigeration. The utility model has the advantages of energy-saving effect, the composition of the mixed refrigerant can be artificially adjusted according to working conditions, the irreversible loss of the throttling process can be reduced, the cooling capacity can be decreased, the circulating amount of the refrigerant can be reduced, and the economic benefit can be higher. Butane mixed refrigerant is feasible in oilfield gas treatment project, which has the promotion value.