顺酐是世界上三大酸酐原料之一(醋酐、顺酐、苯酐)，且其下游产品有着相当广泛的开发和应用前景，可用于合成树脂、涂料、农药、润滑油添加剂、医药、纸张处理剂、食品添加剂、稳定剂等方面。

Maleic anhydride is one of the three major anhydride raw materials in the world (acetic anhydride, maleic anhydride, phthalic anhydride), and its downstream products have a wide range of development and application prospects, which can be used in the synthesis of resins, coatings, pesticides, lubricant additives, pharmaceuticals, paper processing agents, food additives, stabilizers, and other aspects.

目前顺酐技术主要有丁烷法工艺和苯法工艺。我国目前顺酐产能以传统苯法工艺居多，但随着碳四资源利用的推进，丁烷法顺酐装置也逐渐形成规模。

At present, the main production technologies for maleic anhydride include butane process and benzene process. At present, the production capacity of maleic anhydride in China is mainly based on the traditional benzene process, but with the promotion of the utilization of C4 resources, the butane process maleic anhydride plant is gradually forming a scale.

顺酐技术采用正丁烷为原料，与空气反应顺酐。氧化反应是强放热反应，反应过程中需要将反应热移走，因而顺酐装置能往外输出大量蒸汽。因为这个特点，顺酐装置特点适合与一些高耗汽的装置联合设置，如乙苯苯乙烯装置，这样能达到蒸汽互补的目的，提高两套装置的经济性。

Maleic anhydride technology uses n-butane as the raw material and reacts with air to produce maleic anhydride. The oxidation reaction is a strong exothermic reaction, during which the reaction heat needs to be removed, so the maleic anhydride device can output a large amount of steam to the outside. Due to this characteristic, the maleic anhydride unit is suitable for joint installation with some high steam consuming units, such as the ethylbenzene styrene unit, which can achieve the goal of steam complementarity and improve the economic efficiency of the two units.

与传统的苯法顺酐技术相比，RHMA技术能完全苯对环境的污染、顺酐收率高、低能耗、外输蒸汽量高、装置操作周期长的特点。

Compared with traditional benzene based maleic anhydride technology, RHMA technology can completely eliminate the environmental pollution caused by benzene, with high yield of maleic anhydride, low energy consumption, high output of steam, and long operating cycle of the device.

工艺过程

Process

丁烷经蒸发后与空气混合，然后进入氧化反应器。氧化反应器为列管式固定床反应式，催化剂置于反应管内，丁烷和空气与催化剂接触后反应生成顺酐，同时放出大量的反应热，由壳侧的熔盐移走。被加热的熔盐用于产汽后，再回到反应器中。在氧化反应器，丁烷单程转化率可达82~85%，顺酐的重量收率97~103%。

Butane is evaporated and mixed with air before entering the oxidation reactor. The oxidation reactor is a tubular fixed bed reactor, with the catalyst placed inside the reaction tube. Butane and air react with the catalyst to generate maleic anhydride, while releasing a large amount of reaction heat, which is removed by the molten salt on the shell side. The heated molten salt is used for steam production and then returned to the reactor. In the oxidation reactor, the one-way conversion rate of butane can reach 82-85%, and the weight yield of maleic anhydride is 97-103%.

反应后的气体经两级冷却后进入后处理系统，顺酐技术的后处理系统采用溶剂吸收工艺，溶剂选用邻苯二甲酸二丁酯。反应气经吸收、解吸、精制等操作后得到产品顺酐，纯度达到99.5%。

After two stages of cooling, the reacted gas enters the post-treatment system. The post-treatment system of maleic anhydride technology adopts a solvent absorption process, and the solvent is dibutyl phthalate. The reaction gas undergoes absorption, desorption, refining and other operations to obtain the product maleic anhydride, with a purity of 99.5%.

进料要求

Feed requirements

用于顺酐的正丁烷纯度应>=99%，烯烃总量<=0.3%，硫、氯含量<=10ppm。

The purity of n-butane used for the production of maleic anhydride should be= 99%, total olefin content&lt= 0.3%, sulfur and chlorine content&lt= 10ppm.

正丁烷可从混合丁烷、醚后碳四等含正丁烷的C4物料中进行分离得到，也可以用异丁烷正构化工艺将异丁烷制成正丁烷后使用。

N-butane can be separated from C4 materials containing n-butane such as mixed butane and etherified C4, and can also be converted into n-butane using isobutane normalization process for use.

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This article is a friendly contribution from maleic anhydride manufacturers. For more related knowledge, please click: http://www.jnjhhg.cn We will provide you with comprehensive service with a sincere attitude. We will gradually contribute more relevant knowledge to everyone. Stay tuned