Advantages And Disadvantages Of Hot Melte Extrusion

The solid product was then collected from the funnel and added to a hot 95% ethanol solution in an Erlenmeyer flask and completely dissolved. Once the solid was dissolved completely, the solution was allowed to cool to room temperature. Once yellow crystals formed, the solution was placed into

While using the DigiMelt melting point apparatus to heat up the different crystalline substances, there was a specific point in time for each substance in which the crystals started

The vial was removed from the heat and cooled to room temperature. The spin vane was rinsed with 2-3 drops of warm water over the conical vial. The vial was cooled to room temperature then placed in an ice bath for 15 minutes. The liquid was decanted from the mixture and the resulting crystals were dried on filter paper. The crystals were then placed on a watch glass for further drying. The crystals were weighed and a small sample was placed into a capillary tube for melting point determination.

To tube 2 and tube 3 a boiling chip is added. The two tubes are boiled to remove any residual ether. Next, the tubes are cooled to room temperature and placed into an ice bath to allow for crystallization. The solution is then removed from the solid in each tube and discarded. To tube 2 and 3 ~0.5 ml of H2O is added for recrystallization, the tubes

The recrystallization technique utilizes the ability of a compound to dissolve within a hot solvent and produce a solution. As this solution cools, the solute reforms without impurities in a crystal lattice structure.1 For this to work properly, an appropriate solution that will not dissolve the solute at low temperatures, but will at high temperatures, must be used.1 There is no single solvent that will work well for every solute’s recrystallization; different solvents are better suited for some solutes than others.2 Some impurities that do not dissolve within the solvent can be filtered out while the solution is still hot, while other impurities that readily dissolve within the solvent shouldn’t recrystallize with the pure substance (as they are not concentrated enough to

17) Pour a small amount of the hot solvent into the flask containing the solid.

April 2000, the largest gypsum crystal in the world are found in Naica Mexico mine’s Cave of Crystals. Crystals can be made in many different ways. Earth can either make them or they can be made artificially. Crystals can be made out of salt or borax. The earliest crystal grower was Earth. For salt crystal the water starts to evaporate the solution of the amount of salt in the glass that it remains the same. There is not enough water left to keep the sodium and chlorine ions from joining together (What Controls Crystal Growth?). Salt crystals are formed. This experiment will conduct of the type of water will affect the growth of crystals.

Substances such as inorganic salts and minerals, semiconductors, and organic and biological compounds can form crystals under suitable and specific conditions. The method is beneficial in determining the structure of molecules, allowing researchers to characterize and understand their behavior and function. This method of structure determination has provided the most reliable evidence scientists have about the way molecules are shaped and what their bonds angles and lengths are. This also can be useful in education, since we can have more of an understanding as chemistry student or even future, nurses or

Cause: The molten material can become overly fluid when high injection temperatures are used. Thus, air and gases become trapped in the melt stream since the material is now very turbulent due to the high injection temperatures, and these trapped gases will appear in the molded part as voids, as shown in the figures above.

The mineral crystals can form in five ways. First, they can form by the solidification of a melt which the freezing of a liquid, such as ice crystals are a type of mineral made by freezing water. Second, they

By following the above procedure, it was determined that my hypothesis was accepted. Initially, I predicted that sugar will have the best solution for making crystals because the sugar dissolves better in water and will be able to make the best crystals in size and shape. During the experiment, I investigated which solution made the best crystals. However, there was some inconsistencies and consistencies. The inconsistencies and consistencies were finding the perfect spot to put the solutions,the crystals forming, and the right materials. The first inconsistency was finding the perfect spot to put my solutions. It was very difficult for me

Dissolve crude product of previous crystalinization in a clean 125 mL Erlenmeyer flask with ethyl acetate (2-3 mL). Gently heat the solution on a hot plate to dissolve the reagents and then allow the solution to cool down at room temperature. At this point crystals should form, if not add petroleum ether to the solution. Place the flask with the solution on an ice bath until crystallization is complete. Once again, set up the vacuum filtration that was used to collect crude crystal product and vacuum dry the crystals for 10 minutes. Perform the ferric chloride test by setting up four test tubes with salicylic acid, products of crystalinization, products of re-crystalinization and distilled water respectively in order to detect the presence of phenol. Finally, after placing the products of re-crystalinization in the oven for 5-10 min record its mass and its melting point.

The first step is the separation of the solid crystals back into separate ions, a positive ammonium ion and a negative nitrate ion. The break these ionic bonds requires a lot of energy which means heat must be taken from the surrounding water. The second step the water molecules, which are H2O, are attracted to the ions and attach themselves to the ions. The second step actually causes heat to be produced to the surrounding liquid mixture. .Even

Once cooled, the mixture was then transferred to a separatory funnel using the funnel while avoiding adding the boiling chip. 10 ml of water was then added to the mixture. The mixture was gently shaken and the phases were allowed to separate. The funnel was then unstopped and the lower aqueous phase was drained into a beaker. 5 ml of 5% aqueous NaHCO3 was added and then shaken gently. A great deal of caution was taken into consideration because of the production of carbon dioxide gas which caused pressure to develop inside the funnel. The pressure needed to be released so the funnel was vented frequently. The phases were allowed to separate and the lower aqueous phases was drained into the beaker. After draining, 5 ml of saturated NaCl was added to the funnel and then shaken gently. Once again, the phases were allowed to separate and the lower aqueous phase was drained into a beaker. An ester product was produced and was transferred into a 25 ml Erlenmeyer flask. This organic product was then dried over anhydrous Na2SO4 to trap small amounts of water in its crystal lattices thus removing it from the product. Finally the ester was decanted, so that the drying agent was excluded from the final product.

Crystals were collected in a Buchner funnel, washed with alcohol, then ether, then transferred into a sample tube for storage.