Organic 2 Review Problem 448

Organic 2 Review Problem 448 - 432 PRACTICAL ORGANIC...

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432 PRACTICAL ORGANIC CHEMISTRY first until P is held in position, and then more firmly until the material in C has formed a compact pellet. The cylinder C is then removed from F, and the pellet ejected from the lower end by thrusting P completely down the circular bore. NOTE. For most compounds, the circular bore in C should have a diameter of not less than i cm.: otherwise the final ejection of the pellet may prove very difficult. Some powdered substances do not "bind" well in the press however, and for these compounds a cylinder having*a narrower bore (3-5 mm.) is desirable. It is of great advantage, however, to have available a second cylinder similar to, but much shorter than, C, and of wider internal bore. When the pellet has been formed inside C, the plunger S is released and the shorter cylinder inserted between C and the base B. The plunger S is again screwed down, and the pellet is thus slowly forced out of C into the shorter cylinder below. In this way the pellet, even if originally firmly fixed in C, can be removed
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This note was uploaded on 09/19/2011 for the course CHM 2211 taught by Professor Castalleano during the Fall '06 term at University of Florida.

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