顺酐产业链中上游主要为顺酐制备原料和相关设备，原料按照制备方法主要由正丁烷和苯等，设备包括固定床或流化床等制备设备和提纯设备等。中游主要为顺酐的制备，随着下游应用领域持续扩张，国内整体顺酐产能近两年持续扩张，竞争持续激烈，下游来看，顺酐应用广泛，在医药、涂料、油墨、润滑油添加剂、造纸化学品、纺织品整顿剂、食品添加剂以及表面活性剂等领域皆有应用。近几年，顺酐下游应用不断开发，需求总量也在逐步增长，叠加国内“限塑令”的逐步实施， PBS，PBAT 等可降解塑料制品的厂商日渐增多，这将大大地带动原料顺酐需求的增长。

　　The upstream of the maleic anhydride industry chain mainly consists of raw materials and related equipment for the preparation of maleic anhydride. The raw materials are mainly composed of n-butane and benzene according to the preparation method, and the equipment includes fixed bed or fluidized bed preparation equipment and purification equipment. The midstream mainly focuses on the preparation and production of maleic anhydride. With the continuous expansion of downstream application fields, the overall production capacity of maleic anhydride in China has continued to expand in the past two years, and competition has remained fierce. From the downstream perspective, maleic anhydride is widely used in various fields such as pharmaceuticals, coatings, inks, lubricant additives, papermaking chemicals, textile finishing agents, food additives, and surfactants. In recent years, downstream applications of maleic anhydride have been continuously developed, and the total demand is gradually increasing. Coupled with the gradual implementation of the domestic "plastic restriction order", the number of manufacturers producing biodegradable plastic products such as PBS and PBAT is increasing, which will greatly drive the growth of demand for raw material maleic anhydride.

　　正丁烷作为正丁烷氧化法的主要原料，而正丁烷氧化法相较苯法毒性较小，对环境污染小，随着国内压力越来越大，正丁烷法在满足要求以及发展前景更佳，叠加苯价近年波动剧烈，供给稳定性下降，正丁烷法顺酐理论产量比苯法高，国内整体正丁烷氧化法产能持续扩张，截止目前，国内正丁烷氧化法制备顺酐有效产能占比国内产能已近9成，正丁烷供需及费用对顺酐影响力持续走高，2021年以来地缘冲突加速，能源供需结构转差，原油费用持续走高，整体正丁烷费用持续走高，2022年二季度开始，供需持续回暖，正丁烷开始缓步下降，一定程度减轻顺酐成本压力，但截止2022年末，我国正丁烷费用较2020年仍居高位。

　　As the main raw material for n-butane oxidation method, n-butane oxidation method has less toxicity and less environmental pollution compared to benzene method. With the increasing pressure on environmental protection in China, n-butane method has better prospects for meeting environmental requirements and development. In addition, benzene price has fluctuated sharply in recent years, leading to a decrease in supply stability. The theoretical output of succinic anhydride produced by n-butane method is higher than that of benzene method. The overall production capacity of n-butane oxidation method in China continues to expand. As of now, the effective production capacity of succinic anhydride prepared by n-butane oxidation method in China has accounted for nearly 90% of the domestic production capacity. The impact of n-butane supply, demand and cost on maleic anhydride continues to increase. Since 2021, geopolitical conflicts have accelerated, energy supply and demand structure has deteriorated, crude oil costs continue to rise, and the overall cost of n-butane continues to rise. At the beginning of the quarter, supply and demand continued to rebound, and n-butane began to slowly decline, To some extent, the cost pressure of maleic anhydride has been alleviated, but as of the end of 2022, the cost of n-butane in China remains high compared to 2020.

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