Paraffin was first invented in 1830 by The German

1. Paraffin was first invented in 1830 by The German chemist Karl von Reichenbach as he tried to develop methods for efficiently separating and refining the waxy substance naturally present in petroleum. Paraffin was a big step forward in candle manufacturing because it burned cleanly and reliably and cost less to make than any other candle fuel. Paraffin wax has a low initial melting point; However, this was later compensated for by the addition of harder stearic acid. Paraffin production boomed in the early 20th century as petroleum and meat processing industries developed and paraffin and stearic acid became by-products. Make The raw material of paraffin wax is paraffin wax, which is a mixture of oil and wax and is a by-product of lubricating oil refining. The first step in making paraffin wax is to remove the oil (deoiling or dewaxing) from the slack wax. Oil is separated by crystallization. Most commonly, the relaxation wax is heated, mixed with one or more solvents, such as ketones, and then cooled. As it cools, the wax crystallizes out of the

2. solution, leaving only the oil. The mixture is filtered into two strands: solid (wax with some solvent) and liquid (oil and solvent). After the solvent is recovered by distillation, the resulting product is called "product wax" (or "press wax") and "foot oil". The lower the percentage of oil in a wax, the more refined it is considered (semi-refined vs. fully refined). Product waxes can be further processed to remove color and odor. Waxes can eventually be mixed together to obtain certain desired properties, such as melting point and permeability. Paraffin wax is sold in liquid or solid form. Application In industrial applications, it is often useful to alter the crystalline properties of paraffins by adding branches to existing carbon chains. The modification usually uses additives such as EVA copolymers, microcrystalline waxes or polyethylene. The branch chain properties of modified paraffins lead to higher viscosity, smaller crystal structure and modified functional properties. During dewaxing, pure paraffin is rarely used to sculpt raw models of cast metals and other materials because of its relative fragility at room

3. temperature and the risk of debris and breakage during processing. Soft and flexible waxes, such as beeswax, may be preferred for sculpture, but "investment cast waxes", often paraffin-based, are clearly formulated for purpose. In histology or pathology laboratories, paraffin wax is used to impregnate tissue prior to sectioning a thin tissue sample. Water is removed from tissues by increasing the alcohol concentration (75% to absolute) and tissue is removed in organic solvents such as xylene. The tissue is then placed in paraffin wax for several hours before being cooled and solidified in a wax-containing mould; The slices are then cut on a slicer.