Maleic anhydride, also known as maleic anhydride, is mainly used in the manufacture of polyester resin, alkyd resin, coatings, pharmaceuticals, oil additives, etc. Then, what conditions should be paid attention to when using radar level gauge to measure the liquid level of maleic anhydride storage tank?

在化工厂，顺酐储罐有两种，即精酐酐和粗酐罐，这两种储罐主要是圆柱形的拱顶罐，于高度和直径，有高6米，直径6米的，也有其它尺寸的，具体要看自家工况情况。一般情况下，精酐储罐的操作温度大约为60摄氏度，粗酐储罐的操作温度则约为70摄氏度。

In the chemical plant, there are two kinds of maleic anhydride storage tanks, i.e. refined anhydride tank and crude anhydride tank. These two kinds of storage tanks are mainly cylindrical dome roof tanks. As for the height and diameter, there are 6m high, 6m diameter and other sizes. The specific conditions depend on your own working conditions. Generally, the operating temperature of refined anhydride storage tank is about 60 ℃, while that of crude anhydride storage tank is about 70 ℃.

以上是从储罐角度而言的。接下来，再来看看顺酐这种介质，在常压的情况下，顺酐的结晶点是52.8℃。60℃时，液体顺酐的相对介电常数大约是50;20℃时，顺酐呈固态，相对介电常数大约是2.1.

The above is from the perspective of storage tank. Next, let's look at the medium maleic anhydride. Under normal pressure, the crystallization point of maleic anhydride is 52.8 ℃. At 60 ℃, the relative dielectric constant of liquid maleic anhydride is about 50; At 20 ℃, maleic anhydride is solid and its relative dielectric constant is about 2.1

顺酐在化工厂运行过程中，由于微量杂质(反应副产物)的存在，会有结晶出现。曾经有工厂使用过双法兰液位计和吹气式液位计。结果由于结晶，都无法正常测量，且维护量大。

During the operation of maleic anhydride in chemical plant, there will be crystallization due to the existence of trace impurities (reaction by-products). Double flange liquid level gauge and air blowing liquid level gauge have been used in some factories. As a result, due to crystallization, it can not be measured normally, and the amount of maintenance is large.

同时，顺酐也容易出现挥发，形成酐气，酐气有腐蚀性。也曾有工厂采用人工检尺对液位进行测量，结果在有防护的前提下，皮肤黏膜仍有强烈刺激。

Meanwhile, maleic anhydride is also easy to volatilize and form anhydride gas, which is corrosive. There were also factories that used manual ruler to measure the liquid level. The results showed that under the premise of protection, there was still strong irritation to the skin and mucous membrane.

雷达液位计

Radar level gauge

鉴于这种情况的存在，有的厂子开始采用雷达液位计进行液位测量。投入使用后，发现测量效果很理想，而且维护成本也大大降低。从这个实例中，不难看出，雷达液位计可以测量顺酐储罐，但是什么样的雷达液位计合适，还需要大家根据自家实际情况选择。

In view of this situation, some factories began to use radar liquid level gauge for liquid level measurement. After putting into use, it is found that the measurement effect is very ideal, and the maintenance cost is greatly reduced. From this example, it is not difficult to see that the radar level gauge can measure the maleic anhydride storage tank, but what kind of radar level gauge is suitable still needs to be selected according to your own actual situation.

对于雷达液位计而言，顺酐的介电常数虽不影响测量，但是挥发和结晶的情况，大家也应多加重视。

For radar level gauge, although the dielectric constant of maleic anhydride does not affect the measurement, we should pay more attention to the volatilization and crystallization.