SU18480A1 - The method of refining and dewatering camphor - Google Patents

Description

In the manufacture of synthetic camphor, it is technically special, the difficulty is caused by the operation of camphor cleaning by steam distillation.

dehydration operation. Usually

the distillation operation is carried out in cubes connected to a refrigerator, with a series of wide b-3 tubes. Couples of camphor, cooling, settle directly in the pipes and: thus j is strong. reduce the performance of the refrigerator, due to the extremely poor thermal conductivity of camphor. To eliminate this phenomenon, it is necessary to remove the camphor continuously separated on the walls, which is very: very difficult design, especially if you consider the need to supply each tube of the refrigerator with a shaft with scrapers that should fit very closely against the walls of the pipes, for even small gaps rarely reduce the performance of the refrigerator, since a 1-meter camphor layer usually reduces the heat transfer rate by about a factor of normal. At the same time, special accuracy is needed in centering the main (central) shaft, otherwise lagging of scrapers from the walls in some pipes and cutting them into the walls and others is possible.

The resulting camphor contains about 65% moisture production,

those who consume camphor, celluloid and powder, require absolutely moistureless camphor, because water drastically lowers the solubility of nitrocellulose in hundreds of the corresponding solvents. Camphor dehydration on centrifuges does not give the desired results and in most cases the residual moisture is about 12%. The most effective method, the extraction of camphor on hydraulic presses, is also far from being bumpy. As is known, with this method, pressed camphor is wrapped in napkins and subjected to a pressure of 150 atmospheres while being heated by steam. In addition to the fact that not all of the moisture is removed (residual moisture 1.5-2%) and that some amount of camphor is used, pressed camphor is obtained in the form of extremely dense plates that are difficult to remove from napkins when inevitable hitting individual filaments in camphor. In this form, campus for celluloid production cannot be used because they are extremely difficult to dissolve in the compressed state and to remove this difficulty, the camphor is crushed, although it improves the dissolution process somewhat, but still far from fully.

In order to eliminate (the above disadvantages and difficulties, in the proposed method, camphor recrystallization