顺酐无色块状或扣状晶体．可燃，毒性大，具有刺激性气味，所以不管是在生产时还是在使用时都应该做好防护措施，下面为了让大家更好的了解产品，下面氢氧化钾厂家为您解说下顺酐的主要生产方法。

Maleic anhydride is a colorless block or button crystal. It is flammable, toxic and has an irritating smell. Therefore, safety protection measures should be taken both in production and in use. In order to let everyone better understand the product, the following potassium hydroxide manufacturer will explain the main production methods of maleic anhydride for you.

1.苯氧化法。

1. Benzene oxidation method.

苯在V-Mo-P系催化剂作用下，在固定床中发生氧化反应，生成顺丁烯二酸酐，反应温度为365℃（反应床层也可用沸腾床，但消耗高）。然后用水吸收生成顺丁烯二酸，再经共沸脱水和精馏，刮片得到成品。

Under the action of v-mo-p catalyst, benzene undergoes oxidation reaction in a fixed bed to produce maleic anhydride. The reaction temperature is 365 ℃ (the reaction bed can also be a fluidized bed, but the consumption is high). Then, maleic acid is formed by water absorption, and then the finished product is obtained by azeotropic dehydration and rectification and scraping.

反应器在V、MO、Ti、P系催化剂存在下空气氧化成顺丁烯二酸酐，用水吸收为顺丁烯二酸水溶液，然后用二甲苯进行共沸蒸馏脱水得顺酐，后减压精馏得成品。

In the reactor, air is oxidized to maleic anhydride in the presence of V, Mo, Ti and P catalysts, water is absorbed into maleic acid aqueous solution, and then azeotropic distillation dehydration is carried out with xylene to obtain maleic anhydride, and then the finished product is obtained by vacuum rectification.

2.丁烷（或丁烯）氧化法。

2. Butane (or butene) oxidation method.

丁烷（或丁烯）在V-Mo催化剂作用下，经空气或氧气氧化生成顺酐，反应温度350-400℃。然后再经水吸收，脱水和精制得到成品。

Butane (or butene) is oxidized by air or oxygen to maleic anhydride under the action of v-mo catalyst, and the reaction temperature is 350-400 ℃. And then the product is obtained by water absorption, dehydration and refining.

水吸收反应气体经过喷水文氏管骤冷，再进入直径1400mm、高7000mm的水循球喷淋吸收塔，反应气体中的顺丁烯二酸酐蒸气被水吸收，成为含量约30%的顺丁烯二酸溶液。

The water absorption reaction gas is quenched by water spray venturi, and then enters the water circulating spray absorption tower with a diameter of 1400mm and a height of 7000mm. The maleic anhydride vapor in the reaction gas is absorbed by water to become a maleic acid solution with a content of about 30%.

在共沸脱水塔的塔釜内先加混合二甲苯3000kg加热温高于136℃,釜内二甲苯沸腾，此时将30%的顺丁烯二酸溶液自塔中部送入，每小时流量约为350kg，酸溶液中的水与二甲苯形成共沸物自顶部蒸出，顺丁烯二酸失水成酐后溶于二甲苯中，下流塔釜内。

Add 3000kg of mixed xylene into the tower kettle of the azeotropic dehydration tower and heat it to a temperature higher than 136 ℃. The xylene in the kettle boils. At this time, 30% maleic acid solution is sent from the middle of the tower at a flow rate of about 350kg per hour. The water in the acid solution and xylene form an azeotrope and evaporate from the top. The maleic acid loses water to form an anhydride, which is dissolved in xylene and flows down to the tower kettle.

待送入酸液总量达6000kg时，釜内二甲苯中的顺丁烯二酸酐含量约为30%，此溶液输减压精馏釜，先在釜温100℃、塔顶温110℃、真空度93.3kpa的条件下业精馏得顺丁烯二酸酐。水吸收精馏的收率为90%

When the total amount of acid liquid fed reaches 6000kg, the content of maleic anhydride in xylene in the kettle is about 30%. This solution is sent to the vacuum rectification kettle. First, maleic anhydride is obtained by commercial rectification under the conditions of kettle temperature of 100 ℃, tower top temperature of 110 ℃ and vacuum degree of 93.3kpa. The yield from water absorption to rectification is 90%

另外，还应了解，与松香酸合成后，再与多元醇酯化，得到的顺酐松香是油性漆的优良改性树脂。

In addition, it should be understood that maleic anhydride rosin synthesized with rosin acid and then esterified with polyol is an excellent modified resin for oil-based paint.

实际上顺酐的主要生产方法有苯氧化法、丁烯氧化法和正丁烷氧化法，但仍以苯氧化法为主。更多关于此类产品的了解，就来我们网站http://www.jinhao360.com进行咨询吧！

In fact, the main production methods of maleic anhydride are benzene oxidation, butene oxidation and n-butane oxidation, but benzene oxidation is still the main one. For more information about such products, please visit our website http://www.jinhao360.com Let's consult!