中國是順酐生產(chǎn)廠家大國，那么今天就一起了解一下順酐和順?biāo)醿烧卟煌幎俭w現(xiàn)在哪些方面？
China is a big manufacturer of maleic anhydride, so let's understand the differences between maleic anhydride and maleic acid in what aspects?
1、稱取大約相同的量，用水溶解后，再用堿滴定，消耗堿多的是酐，消耗堿少的是酸。
1. Weigh about the same amount, dissolve it with water, and then titrate it with alkali. The one that consumes more alkali is anhydride, and the one that consumes less alkali is acid.
2、或取少量相同量的樣品溶解于水，用pH計(jì)檢測，pH值低的是酐，pH稍高的是酸。
2. Or take a small amount of the same amount of sample to dissolve in water, and use pH meter to detect. The lower pH value is anhydride, and the higher pH value is acid.
3、用熔點(diǎn)檢測也可以，酐與酸的熔點(diǎn)不同。順酐約52~53℃，順?biāo)峒s130℃。
3. It can also be detected by melting point. The melting point of anhydride is different from that of acid. Maleic anhydride is about 52-53 ℃, and maleic acid is about 130 ℃.
4、簡單的辦法，找一小塊不銹鋼片，將兩種樣品各放一點(diǎn)于鋼片兩側(cè)，用打火機(jī)在兩個(gè)樣品中間加熱，先液化并揮發(fā)的是順酐。
4. In a simple way, find a small piece of stainless steel sheet, place two samples on both sides of the sheet, heat them in the middle of the two samples with a lighter, and the first thing that liquefy and volatilize is maleic anhydride.
制作方式：
Production method:
1. 苯氧化制山東順酐
1. Oxidation of benzene to Shandong maleic anhydride將苯與空氣混合(苯為1%-1.4% )經(jīng)換熱器預(yù)熱后，進(jìn)人列管式催化反應(yīng)器。在壓力為0.1-0.2MPa、溫度為350-400℃的反應(yīng)條件下進(jìn)行氧化反應(yīng)，所得產(chǎn)物經(jīng)兩臺換熱器、一臺冷卻器后，冷卻到接近露點(diǎn)(55―65℃)。冷卻后的反應(yīng)物進(jìn)入分離器，分離器底部得粗順酐，進(jìn)入粗順酐罐。分離器頂部流出物進(jìn)人洗滌塔，用水洗滌，塔頂為多余空氣和未反應(yīng)的苯，苯可用吸附回收。洗滌塔塔底水溶液進(jìn)人脫水器，分離出水，所得粗順酐進(jìn)人粗順酐罐。粗順酐進(jìn)一步進(jìn)人蒸餾塔進(jìn)行蒸餾精制，得順酐。所得山東順酐可進(jìn)行異構(gòu)化得富馬酸和蘋果酸。
The mixture of benzene and air (benzene is 1% - 1.4%) is preheated by heat exchanger and then put into the tubular catalytic reactor. The oxidation reaction was carried out at the pressure of 0.1-0.2mpa and the temperature of 350-400 ℃. The product was cooled to the dew point (55-65 ℃) by two heat exchangers and one cooler. The cooled reactant enters the separator, and the crude maleic anhydride is obtained at the bottom of the separator and enters the crude maleic anhydride tank. The effluent from the top of the separator enters into the washing tower and is washed with water. The top of the tower is redundant air and unreacted benzene, which can be recovered by adsorption. The bottom water solution of the washing tower enters into the human dehydrator, the separated water, and the obtained crude maleic anhydride enters into the human crude maleic anhydride tank. Crude maleic anhydride is further distilled into a distillation tower to obtain maleic anhydride. The maleic anhydride can be isomerized to fumaric acid and malic acid.
2.C4餾分部分氧化制順酐
2. Partial oxidation of C4 fraction to maleic anhydride工業(yè)上用不經(jīng)分離的C4餾分或分離異丁烯和丁二烯后的C4餾分為原料生產(chǎn)順酐。C4餾分與空氣混合后進(jìn)人流化床氧化反應(yīng)器，在300―500℃溫度下，與反應(yīng)器中的催化劑接觸生產(chǎn)順酐。氧化反應(yīng)器頂部流出的反應(yīng)生成物進(jìn)人吸收塔，用水作為吸收劑，塔頂氣體經(jīng)廢水Maleic anhydride is produced from C4 fraction without separation or C4 fraction after separation of isobutylene and butadiene. C4 fraction is mixed with air and then enters the fluidized bed oxidation reactor. At 300-500 ℃, it contacts with the catalyst in the reactor to produce maleic anhydride. The reaction products from the top of the oxidation reactor enter the absorption tower, and water is used as the absorbent. The gas from the top of the tower flows through the waste water以上就是對順酐和順?biāo)醿烧卟煌幎俭w現(xiàn)在哪些方面的詳細(xì)介紹，想要了解更多，請點(diǎn)擊官網(wǎng)http://www.paimaizhe.com
The above is a detailed introduction of the differences between maleic anhydride and maleic acid. To learn more, please click http://www.paimaizhe.com
