Original title: What should we pay attention to when using the reactor for
cooling? When using the reactor cooling device, the user needs to pay attention
to its refrigeration and heating operation, and pay attention to the operation
within a reasonable temperature range, so as to avoid the reactor cooling
failure caused by excessive temperature and pressure. Therefore, we need to
understand clearly some points for attention in use. The heat transfer jacket
for temperature reduction and cooling of the reaction kettle is generally made
of common carbon steel, and is a container which is sleeved outside the barrel
of the reactor to form a sealed space, so that the heat transfer jacket is
simple and convenient. The jacket is provided with an inlet and an outlet for
water vapor,
50l
rotovap, cooling water or other heating and cooling media. (If the heating
medium is water vapor, the inlet pipe shall be close to the upper end of the
jacket, and the condensate shall be discharged from the bottom; if the heat
transfer medium is liquid,
rotovap
distillation, the inlet pipe shall be placed at the bottom, and the liquid
shall enter from the bottom and flow out from the top, so that the heat transfer
medium can fill the whole jacket space. Sometimes, for larger vessels, in order
to obtain better heat transfer effect,
jacketed
glass reactor ,
wiped film
distillation, a spiral guide plate is installed in the jacket space to
reduce the flow area of the fluid in the jacket, improve the flow speed of the
fluid and avoid short circuit, but the structure is more complex. When the
diameter of the kettle is large or the pressure of the heat transfer medium is
high, the welded semi-circular spiral pipe or spiral angle steel structure is
often used to replace the jacketed structure. In this way, not only the flow
velocity of the heat transfer medium can be increased and the heat transfer
effect can be improved, but also the compressive strength and rigidity outside
the reactor can be improved. After the cooling operation of the reaction kettle,
water cooling (exothermic reaction) or air cooling can be carried out. The
needle valve system is sealed. Only by slightly rotating the valve needle and
pressing the cover tightly, good sealing can be achieved. It is forbidden to use
excessive force to avoid damaging the sealing surface. After the reaction is
finished, cooling is firstly carried out, then the high-pressure gas in the
kettle is released, the pressure is reduced to normal pressure, and then the
bolts are symmetrically and equally unscrewed and disassembled. Special
attention shall be paid to the protection of the sealing surface during the
removal of the cover. After each cooling operation of the reaction kettle, the
residues on the kettle body and the kettle cover shall be removed. All sealing
surfaces on the reaction kettle shall be cleaned frequently and kept dry. It is
not allowed to use hard objects or soft objects with rough surface for cleaning.
The agitator shall be disassembled for cleaning. The height of the cooling
jacket of the reactor is determined by the heat transfer area, which is
determined by the process requirements. However, it should be noted that the
height of the jacket is generally not lower than the height of the feed liquid,
and it should be about 50 ~ 100 mm higher than the liquid level in the reactor
to ensure sufficient heat transfer. Various types of reactors are available for
reactor cooling, so users must select the model according to their own working
conditions in the early stage of selection, so as to avoid the situation of too
large or too small selection. This article source network,
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