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Is it possible to separate two chemicals with slightly different melting points? Can this be done with the use of a lab freezer? As MP is -44 and The other is -61 - -59 °C.

Will it solidify these two substances separately? Or each becoming a separate layer?

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    $\begingroup$ Depends, see: Eutectic $\endgroup$ – A.K. Aug 24 '18 at 1:41
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The process of separating chemicals by their melting points is called fractional freezing. In zone refining, it is used to produce some of the most pure chemicals, for example Si 99.999999999% (11N, meaning 11 9's) pure.

However, your question per se is far too general to be answered. Some substances can be more easily separated than others. For example, an attempt to separate $\ce{DHO}$ and $\ce{D2O}$ from $\ce{H2O}$ did not succeed under the test conditions.

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  • $\begingroup$ Physicochemical Information of unwanted chemical is Boiling point 119 - 121 °C (1013 hPa) Density 0.913 g/cm3 (20 °C) Explosion limit 1.8 %(V) Flash point 18 °C Ignition temperature 329 °C Melting Point -61 - -59 °C Vapor pressure 21.3 hPa (20 °C) Solubility 5.1 g/l. $\endgroup$ – Mr G Aug 24 '18 at 2:02
  • $\begingroup$ And the desired in is. Molar mass 86.09 g·mol−1 Appearance Colorless liquid Density 1.1286 g/mL (15 °C), 1.1296 g/mL (20 °C) Melting point −43.53 °C (−46.35 °F; 229.62 K) Boiling point 204 °C (399 °F; 477 K) log P -0.76[3] Acidity (pKa) 4.5 Refractive index (nD) 1.435, 1.4341 (20 °C) Viscosity 1.7 cp (25 °C $\endgroup$ – Mr G Aug 24 '18 at 2:05
  • $\begingroup$ What if I buy a HPLC Chromatography machine. Will this work? $\endgroup$ – Mr G Aug 24 '18 at 5:22
  • $\begingroup$ With the difference in boiling points you quote (120C v 204C) distillation loooks a good bet. $\endgroup$ – Waylander Aug 24 '18 at 15:12

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