目前，工业上顺酐的工艺路线按原料可分为苯氧化法、正丁烷法氧化法、C4烯烃法和苯酐副产法4种。下面顺酐厂家来讲讲顺酐工艺的比较与选择：

At present, the production process routes of maleic anhydride in industry can be divided into four types based on raw materials: benzene oxidation method, n-butane oxidation method, C4 olefin method, and phthalic anhydride by-product method. Below, maleic anhydride manufacturers will discuss the comparison and selection of maleic anhydride production processes:

以前，苯氧化法应用为广泛，但由于苯资源有限，C4烯烃和正丁烷为原料顺酐的技术应运而生，尤其是富产天然气和油田伴生气的，拥有大量的正丁烷资源，因此近年来正丁烷氧化法顺酐的技术发展迅速，已经在顺酐中占主导地位。C4烯烃氧化法因副产物较多已被淘汰，而苯酐副产法顺酐产量有限。

Previously, the benzene oxidation method was widely used, but due to limited benzene resources, the technology of producing maleic anhydride using C4 olefins and n-butane as raw materials emerged, especially in countries rich in natural gas and oilfield associated gas, which have a large amount of n-butane resources. Therefore, in recent years, the technology of producing maleic anhydride using n-butane oxidation method has developed rapidly and has taken a dominant position in the production of maleic anhydride. The C4 olefin oxidation method has been phased out due to its high number of by-products, while the production of maleic anhydride from the phthalic anhydride by-product method is limited.

苯氧化法及正丁烷法是目前各国顺酐普遍采用的工艺。我国主要采用苯氧化法，经过多年的开发应用，工艺比较成熟，同时具有工艺简单、操作容易、投资省、收率高等特点。

The benzene oxidation method and n-butane method are currently commonly used processes in the production of maleic anhydride in various countries. China mainly adopts the benzene oxidation method. After years of development and application, the process is relatively mature, and has the characteristics of simple process, easy operation, low investment, and high yield.

顺酐产品成本50%左右是原料费用，已工业化的顺酐技术都是以控制大收率来确定工艺条件。与传统苯法相比，正丁烷氧化法具有原料价廉、污染小等优点。

About 50% of the cost of maleic anhydride products is the cost of raw materials, and the industrialized production technology of maleic anhydride determines the process conditions by controlling the high yield. Compared with traditional benzene method, n-butane oxidation method has advantages such as low cost of raw materials and low pollution.

正丁烷法每吨顺酐产品消耗1.l～1.2吨正丁烷，而苯法每吨顺酐产品消耗1.1～1.3吨苯。而且正丁烷法顺酐理论产量为1：1.69，苯法为1：1.256，因此正丁烷的顺酐理论产量比苯法高许多。

The n-butane method consumes 1-1.2 tons of n-butane per ton of maleic anhydride product, while the benzene method consumes 1.1-1.3 tons of benzene per ton of maleic anhydride product. Moreover, the theoretical yield of maleic anhydride produced by the n-butane method is 1:1.69, and that by the benzene method is 1:1.256. Therefore, the theoretical yield of maleic anhydride produced by n-butane is much higher than that by the benzene method.

随着技术的不断发展，正丁烷作原料其单耗将比苯法低得多，正丁烷不仅消耗少，而且与苯法相比，其毒性也小，同时正丁烷法顺酐对环境污染小，随着全球压力越来越大，正丁烷法在满足要求以及发展前景方面比苯法更具有生命力。

With the continuous development of technology, the unit consumption of n-butane as raw material will be much lower than that of the benzene method. n-butane not only consumes less, but also has less toxicity compared to the benzene method. At the same time, the production of maleic anhydride using n-butane method has less environmental pollution. With the increasing global environmental pressure, the n-butane method has more vitality than the benzene method in meeting environmental requirements and development prospects.

正因为如此，目前全球新建顺酐能力约80%采用正丁烷路线，而且还有不断增加的趋势。由正丁烷氧化制顺酐，自1974年美国孟山都等公司实现工业化以来得到迅速的发展，丁烷来自炼厂气、裂解气或油田伴生气等。

Because of this, about 80% of the global newly built production capacity of maleic anhydride adopts the n-butane route, and there is a continuous increasing trend. The oxidation of n-butane to maleic anhydride has undergone rapid development since the industrialization of companies such as Monsanto in the United States in 1974. Butane comes from refinery gas, cracking gas, or oilfield associated gas.

在固定床工艺中，由于正丁烷氧化选择性和反应速率均比苯法低，正丁烷-空气混合物中正丁烷浓度可高达1.6%～1.8%（摩尔分数），顺酐收率按正丁烷计约为50%，故对于同样规模的装置需求较大的反应器和压缩机；采用流化床反应器可使正丁烷在空气中的浓度提高到3%～4%（摩尔分数）。流化床反应器传热效果好，且投资较少，但流化床用的催化剂磨损较多，对大型顺酐装置（2万吨/年以上），如能获得价廉且供应有保障的正丁烷原料，宜选用流化床反应器。

In the fixed bed process, due to the lower selectivity and reaction rate of n-butane oxidation compared to the benzene method, the concentration of n-butane in the n-butane air mixture can reach as high as 1.6% to 1.8% (molar fraction), and the yield of maleic anhydride is about 50% based on n-butane. Therefore, there is a greater demand for reactors and compressors for production units of the same scale; The use of a fluidized bed reactor can increase the concentration of n-butane in air to 3% to 4% (mole fraction). The fluidized bed reactor has good heat transfer efficiency and less investment, but the catalyst used in the fluidized bed is more worn. For large maleic anhydride production units (over 20000 tons/year), if affordable and guaranteed supply of n-butane raw materials can be obtained, it is advisable to choose a fluidized bed reactor.

目前正丁烷氧化工艺以固定床为主，顺酐回收工艺除我国两套装置采用水吸收法，其他装置均采用溶剂吸收法。溶剂采用DBP要多于DIBE。

At present, the n-butane oxidation process is mainly based on a fixed bed, and the maleic anhydride recovery process uses solvent absorption method except for two units in China that use water absorption method. The solvent uses DBP more than DIBE.

综上所述，正丁烷氧化工艺后处理，溶剂吸收法具有产品质量稳定、装置收率高、副产物少、腐蚀性弱、成本低、公用工程消耗小、蒸汽输出平稳且连续等优点，所以后处理工艺采用溶剂吸收工艺更经济、更，同时这也符合我国国情和环境政策的要求。您有需求就来我们网站http://www.jnjhhg.cn咨询吧！

In summary, the solvent absorption method for the post-treatment of n-butane oxidation process has the advantages of stable product quality, high device yield, fewer by-products, weak corrosiveness, low cost, low utility consumption, stable and continuous steam output, etc. Therefore, the solvent absorption process is recommended for future treatment processes to be more economical and environmentally friendly, which also meets the requirements of China's national conditions and environmental policies. Come to our website if you have any needs http://www.jnjhhg.cn Consult!