順酐無色塊狀或扣狀晶體．可燃，毒性大，具有刺激性氣味，所以不管是在生產(chǎn)時(shí)還是在使用時(shí)都應(yīng)該做好防護(hù)措施，下面為了讓大家更好的了解產(chǎn)品，下面氫氧化鉀廠家為您解說下順酐的主要生產(chǎn)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系催化劑作用下，在固定床中發(fā)生氧化反應(yīng)，生成順丁烯二酸酐，反應(yīng)溫度為365℃（反應(yīng)床層也可用沸騰床，但消耗高）。然后用水吸收生成順丁烯二酸，再經(jīng)共沸脫水和精餾，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.

反應(yīng)器在V、MO、Ti、P系催化劑存在下空氣氧化成順丁烯二酸酐，用水吸收為順丁烯二酸水溶液，然后用二甲苯進(jìn)行共沸蒸餾脫水得順酐，后減壓精餾得成品。

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催化劑作用下，經(jīng)空氣或氧氣氧化生成順酐，反應(yīng)溫度350-400℃。然后再經(jīng)水吸收，脫水和精制得到成品。

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.

水吸收反應(yīng)氣體經(jīng)過噴水文氏管驟冷，再進(jìn)入直徑1400mm、高7000mm的水循球噴淋吸收塔，反應(yīng)氣體中的順丁烯二酸酐蒸氣被水吸收，成為含量約30%的順丁烯二酸溶液。

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%.

在共沸脫水塔的塔釜內(nèi)先加混合二甲苯3000kg加熱溫高于136℃,釜內(nèi)二甲苯沸騰，此時(shí)將30%的順丁烯二酸溶液自塔中部送入，每小時(shí)流量約為350kg，酸溶液中的水與二甲苯形成共沸物自頂部蒸出，順丁烯二酸失水成酐后溶于二甲苯中，下流塔釜內(nèi)。

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.

待送入酸液總量達(dá)6000kg時(shí)，釜內(nèi)二甲苯中的順丁烯二酸酐含量約為30%，此溶液輸減壓精餾釜，先在釜溫100℃、塔頂溫110℃、真空度93.3kpa的條件下業(yè)精餾得順丁烯二酸酐。水吸收精餾的收率為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，還應(yīng)了解，與松香酸合成后，再與多元醇酯化，得到的順酐松香是油性漆的優(yōu)良改性樹脂。

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.

實(shí)際上順酐的主要生產(chǎn)方法有苯氧化法、丁烯氧化法和正丁烷氧化法，但仍以苯氧化法為主。更多關(guān)于此類產(chǎn)品的了解，就來我們網(wǎng)站http://www.tjxjw.com進(jìn)行咨詢吧！

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.tjxjw.com Let's consult!