随着顺酐生产技术不断提高，被广泛应用于各种制造行业，主要包括医药行业、油脂树脂行业以及润滑油添加剂行业等。基于此，顺酐生产厂家就顺酐生产工艺路线进行简要分析，希望可以提共一个有效的借鉴。

With the continuous improvement of maleic anhydride production technology, it is widely used in various manufacturing industries, mainly including the pharmaceutical industry, grease resin industry, and lubricant additive industry. Based on this, maleic anhydride manufacturers have conducted a brief analysis of the production process route of maleic anhydride, hoping to provide an effective reference.

苯氧化法:

Benzene oxidation method:

苯法生产顺酐是在固定床反应器中，使原料苯经过催化剂V-MO-_P碳化硅的催化，与空气接触完成氧化反应生成顺酐气体。然后顺酐气体经水的吸收以及恒沸脱水，减压连续精馏后，得到顺酐。苯法顺酐的生产工艺中，通过对催化剂的装填、反应器压力、反应器进口气温度、空速和熔盐温度的优化来完善整个工艺。

The production of maleic anhydride by the benzene method is carried out in a fixed bed reactor, where the raw benzene passes through the catalyst V-MO-_ The catalysis of P silicon carbide, in contact with air, completes the oxidation reaction to generate maleic anhydride gas. Then, the maleic anhydride gas is absorbed by water and subjected to azeotropic dehydration, followed by continuous distillation under reduced pressure to obtain maleic anhydride. In the production process of benzene based maleic anhydride, the entire process is improved by optimizing the loading of catalysts, reactor pressure, reactor inlet temperature, space velocity, and molten salt temperature.

目前，在我国顺酐的生产厂家大部分均采用的是苯法工艺，其装置小部分从国外引进。大部分采用仍国内技术。例如常州亚邦化工集团采用的就是苯工艺法。基本原理是采用苯原料依托固定床氧化，使用二甲苯恒沸脱水、加入冷凝器加水吸收的回收工艺、反应热的回收利用等工艺。

At present, most manufacturers of maleic anhydride in China use the benzene process, and a small portion of their devices are imported from abroad. Most of them still use domestic technology. For example, Changzhou Yabang Chemical Group adopts the benzene process method. The basic principle is to adopt advanced processes such as benzene raw material relying on fixed bed oxidation, xylene azeotropic dehydration, adding water to the condenser for absorption, and the recovery and utilization of reaction heat.

在苯法生产工艺中，原料来源可以得到保障与支持;其次苯法采用的连续精馏可使顺酐质量更加稳定且提高收率降低能耗;另外，近年来采用背压式汽轮机新装置利用余热产生蒸汽使得热平衡得到更大的完善，不仅充分利用热能，可降低生产成本，增加经济效益。

In the benzene production process, the source of raw materials can be guaranteed and supported first; Secondly, the continuous distillation used in the benzene method can make the quality of maleic anhydride more stable, improve the yield, and reduce energy consumption; In addition, in recent years, the use of back pressure steam turbines to generate steam from waste heat has greatly improved the heat balance, not only making full use of heat energy, but also reducing production costs and increasing economic benefits.

由于原材料等原因，我国基本上采取苯氧化法，但是弊端是对苯的利用率低，污染了环境，其主要污染物为废气、废水、废渣。

Due to reasons such as raw materials, China basically adopts the benzene oxidation method, but the disadvantage is that the utilization rate of benzene is low, which pollutes the environment. The main pollutants are exhaust gas, wastewater, and waste residue.

顺酐生产工艺

Maleic anhydride production process

正丁烷氧化法C4馏分中成本低且易得到原料是正丁烷。与氧气混合氧化产生顺酐是三种方式中成本低。正丁烷氧化法由于污染小、成本低的特征，在近年来得到广泛的应用，随着混合C4馏分为原料固定床氧化工艺发展并成熟，逐渐占据生产工艺中主导地位。正丁烷生产顺酐方式主要有两大优势:

The low cost and easily obtainable raw material in C4 fraction of n-butane oxidation method is n-butane. Mixed oxidation with oxygen to produce maleic anhydride is one of the three low-cost methods. The n-butane oxidation method has been widely used in recent years due to its characteristics of low pollution and low cost. With the development and maturity of the fixed bed oxidation process using mixed C4 fractions as raw materials, it gradually occupies a dominant position in the production process. The production of maleic anhydride using n-butane has two main advantages:

正丁烷原料以苯原料更为便宜，由于苯原料被各生产行业厂泛使用，使得苯不断上浮更是加剧苯与正丁烷单价差异;正丁烷原材料生产中所释放的有市副产物比苯原材料更少，很大程度上减少了环境的污染，并且正丁烷氧化生产工艺所需要装置与苯氧化生产工艺装置相同，差别仅在于将催化剂环节更换为正丁烷氧化设备。

The price of n-butane raw material is cheaper than that of benzene raw material. Due to the widespread use of benzene raw material by various production factories, the price of benzene continues to rise, exacerbating the price difference between benzene and n-butane; The production of n-butane raw materials releases fewer commercial by-products than benzene raw materials, greatly reducing environmental pollution. Moreover, the equipment required for n-butane oxidation production process is the same as that for benzene oxidation production process, with the only difference being that the catalyst link is replaced with n-butane oxidation equipment.

因此，顺酐生产相关科研人员加大对正丁烷氧化生产顺酐工艺研究力度，在一-定程度上推动了正丁烷氧化法发展。正J烷氧化生产顺酐是非常复杂氧化还原反应，生产环节为氧化反应环节和后处理回收环节。

Therefore, researchers related to the production of maleic anhydride have increased their research on the process of n-butane oxidation to produce maleic anhydride, which has to some extent promoted the development of n-butane oxidation method. The production of maleic anhydride by n-J alkane oxidation is a very complex oxidation-reduction reaction, which involves oxidation reaction and post-treatment recovery.

苯法及正丁烷法生产工艺比较

Comparison of Production Processes between Benzene Method and n-Butane Method

在顺酐生产工艺方面苯法及正丁烷法大致相同，其共性主要体现在选择使用固定床与空气进行氧化、部分冷凝过程中用水进行吸收、利用二甲苯间歇沸脱水精制的工艺路线上。这两种生产工艺除了原料不同，生产工艺路线基本上是一致的，除此之外它们之间大的区别:

In terms of the production process of maleic anhydride, the benzene method and the n-butane method are roughly the same, and their commonalities are mainly reflected in the selection of a fixed bed for oxidation with air, water absorption during partial condensation, and the use of xylene intermittent boiling dehydration and refining process route. These two production processes, apart from different raw materials, have basically the same production process route. In addition, there are significant differences between them:

正丁烷生产工艺中需要增加包括正丁烷分离、反应器的压力提高废气焚烧系统在内的三套气分装置;正丁烷氧化法在原料上更省、生产成本更低、产出量更高，催化剂使用更好、环境污染更轻、技术上更新的特点使得正丁烷法成为了目前国内企业生产顺酐的发展新趋势。更多相关内容就来我们网站http://www.jnjhhg.cn咨询！

In the production process of n-butane, it is necessary to add three sets of gas separation devices, including n-butane separation, reactor pressure increase, and waste gas incineration system; The n-butane oxidation method has become a new trend in the production of maleic anhydride by domestic enterprises due to its advantages such as lower raw materials, lower production costs, higher output, better catalyst use, lighter environmental pollution, and updated technology. For more related content, come to our website http://www.jnjhhg.cn consulting service