Excuse me, 98 of the sulfuric acid crystallized in the pipeline in winter, what is the solution?

1. Install steam heating pipes. It's a good workaround and doesn't consume much steam. The sulfuric acid storage tank can be used 200 meters away, and the coldest weather will not crystallize and block the pipe after using steam heating and insulation.

2. Thermal insulation layer is added. The same principle is the same as installing steam heat trace pipes, except that one is internal and the other is external, both by increasing the temperature to prevent sulfuric acid crystallization.

3. Reduce the distance of transportation. Reducing the distance transported can also reduce the crystallization of sulfuric acid, because sulfuric acid can provide a part of its own heat and not crystallize.

The freezing point of sulfuric acid varies with concentration, and at 0 100% by weight concentration, there are several lowest freezing points:

1 When the concentration is 38%, the freezing point is -degrees.

2 When the concentration is, the freezing point is -degrees.

3 When the concentration is, the freezing point is -degrees.

4 When the concentration is 100%, the freezing point is degrees.

5 When the concentration is 98%, the freezing point is -degrees.

Because sulfuric acid can be seen as a combination of 3+1 = 4 simple eutectic phase diagrams.

h2o h2so4·4h2o h2so4·2h2o h2so4·h2o h2so

The temperature-composition of the three stable compounds of 4H2SO4·H2O, H2SO4·2H2O, and H2SO4·4H2O is shown as follows. It can be seen as a combination of 3+1 = 4 simple eutectic phase diagrams.

solution, H2O(S)+ solution, H2SO4·4H2O(S)+ solution.

H2SO4·4H2O(S)+ solution, —H2SO4·2H2O(S)+ solution.

H2SO4·2H2O(S)+ solution, —H2SO4·H2O(S)+ solution.

H2SO4(S)+ solution, —H2O(S)+H2SO4·4H2O(S)).

h2so4·4h2o（s）+ h2so4·2h2o（s），ⅻh2so4·2h2o（s）+ h2so4 ·h2o（s）, h2so4·h2o（s）+ h2so4（s）

As can be seen from the figure: concentrated sulfuric acid is 98%, the crystallization temperature and very low only, as the product output is easy to crystallize out H2SO4 solids to block the pipeline. The concentration is commonly known as 93% acid) sulfuric acid because its freezing point is about -35 for product transportation safety, will not encounter the problem of filling the pipeline.

The freezing point of about 90% of sulfuric acid varies greatly with concentration. 93% acid--35, while 91% acid-, 89% acid-4In the winter it is easy to have solids folded out.

Therefore, it is not possible to use the same pipeline to output different concentrations of sulfuric acid in winter, so as not to cause pipeline blockage due to concentration changes. Therefore, more than 98% of enterprises that need to use concentrated sulfuric acid should pay special attention to heat preservation.

The melting point of sulfuric acid is 10 and it crystallizes easily in winter.

If it flows all the time, it is not easy to crystallize, and in winter, it is generally used to use the method of dilution (dilution to a certain concentration, the melting point drops significantly) and then transported by pipeline.

If it is partially crystalline, the diluted sulfuric acid is transferred instead. If it is completely crystallized, it can only be used by heating.

Method:1Conveying pipeline plus heat tracing and insulation, 2After the sulfuric acid is transported in the pipeline, it should be replaced or purged, and the pipeline should be replaced with a low freezing point acid (low concentration).

The concentrated sulfuric acid pipeline is blocked and crystallized, and it is suspected that the crystallization is ferrous sulfate, how to solve the blockage.

Hello, Zheng Xing next to the very high branch to answer your questions, has found the answer for you, the way to solve the blockage of ferrous sulfate pipes are: 1. Qi Zheng added anti-blocking agent: such as using heat stabilizers, reducing the content of heat stabilizers, changing the type of anti-blocking agents, adding ion regulators, etc., can reduce the generation of crystals, thereby reducing pipeline blockage.

2. Increase the temperature: Increasing the temperature appropriately can prevent the formation of crystals, but if the temperature is too high, the pipeline will be damaged, so the temperature should be controlled. 3. Increase the flow rate

Increasing the flow rate can improve the fluidity of the concentrated sulfuric acid, so that the crystals cannot be deposited inside the pipe, thus preventing clogging. 4. Cleaning the pipeline: Cleaning the pipeline in time can remove the crystals in the pipeline, so as to avoid the blockage of the pipeline.

5. Use decrystallizer: adding decrystallizer in the pipeline, such as benzene, cyclohexanol, ethanol, etc., can inhibit the formation of crystals and prevent the pipeline from being blocked.