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順酐是世界上三大酸酐原料之一(醋酐、順酐、苯酐)，且其下游產(chǎn)品有著相當廣泛的開發(fā)和應用前景，可用于合成樹脂、涂料、農(nóng)藥、潤滑油添加劑、醫(yī)藥、紙張?zhí)幚韯?、食品添加劑、穩(wěn)定劑等方面。

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.

目前順酐技術主要有丁烷法工藝和苯法工藝。我國目前順酐產(chǎn)能以傳統(tǒng)苯法工藝居多，但隨著碳四資源利用的推進，丁烷法順酐裝置也逐漸形成規(guī)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.

順酐技術采用正丁烷為原料，與空氣反應順酐。氧化反應是強放熱反應，反應過程中需要將反應熱移走，因而順酐裝置能往外輸出大量蒸汽。因為這個特點，順酐裝置特點適合與一些高耗汽的裝置聯(lián)合設置，如乙苯苯乙烯裝置，這樣能達到蒸汽互補的目的，提高兩套裝置的經(jīng)濟性。

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.

與傳統(tǒng)的苯法順酐技術相比，RHMA技術能完全苯對環(huán)境的污染、順酐收率高、低能耗、外輸蒸汽量高、裝置操作周期長的特點。

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.

工藝過程

Process

丁烷經(jīng)蒸發(fā)后與空氣混合，然后進入氧化反應器。氧化反應器為列管式固定床反應式，催化劑置于反應管內(nèi)，丁烷和空氣與催化劑接觸后反應生成順酐，同時放出大量的反應熱，由殼側(cè)的熔鹽移走。被加熱的熔鹽用于產(chǎn)汽后，再回到反應器中。在氧化反應器，丁烷單程轉(zhuǎn)化率可達82~85%，順酐的重量收率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%.

反應后的氣體經(jīng)兩級冷卻后進入后處理系統(tǒng)，順酐技術的后處理系統(tǒng)采用溶劑吸收工藝，溶劑選用鄰苯二甲酸二丁酯。反應氣經(jīng)吸收、解吸、精制等操作后得到產(chǎn)品順酐，純度達到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%.

進料要求

Feed requirements

用于順酐的正丁烷純度應>=99%，烯烴總量<=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.

正丁烷可從混合丁烷、醚后碳四等含正丁烷的C4物料中進行分離得到，也可以用異丁烷正構(gòu)化工藝將異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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