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All Categories > ASTM Testing Apparatus > High Vacuum (HIVAC) Still, ASTM D5236 > Distillation System, with Stainless Steel Flasks, ASTM D5236 > View Items  
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Distillation System, with Stainless Steel Flasks, ASTM D5236

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Every fractionators reaches a limit above which it cannot operate. This limit is imposed by the pressure gradient in the packed column (10-15 mm Hg) which cause the vapors at the bottom of the tower to be hotter than those at the top. This difference, coupled with the temperature differential between the vapors and the liquid in the kettle is often 66°C. In the case of a crude oil distillation, the liquid is brought to the point of thermal cracking in a short period of time. Operating at 329°C for more than 30 minutes, significant cracking will take place altering the composition of the product taken off. This will correspond to an overhead cut off point of 343°C to 427°C AET depending on the gravity of the charge.

To overcome thermal cracking, the fractionating tower with its packing must be eliminated and a still in which no significant pressure gradient occurs during operation must be used. The H.S. Martin Hivac Still, which is a simple one-plate distillation, is ideally suited. The Hivac Still takes over where the fractionators leave off and can distill overhead fractions from crudes and similar mixtures up to a cut point of 565°C AET depending on the gravity of the residue and also limited by the heat tolerance of the charge. The 329°C temperature limit still applies, but the pressure drop in operation is less than 100 microns (0.1 mmHg) which permits the still to take over hotter vapors: i.e., heavier distillate.




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Part #

Item Name

Type

System Size

Charge Range

Recommended Flask Size

Joint

Voltage

500270-4025 Distillation System Type "J" 25 mm 1 to 2 L 2 to 3 L 35/25 115 V
500270-4036 Distillation System Type "J" 36 mm 2 to 4 L 3 to 6 L 65/40 115 V
500270-4050 Distillation System Type "J" 50 mm 4 to 8 L 6 to 12 L 75/50 115 V
500270-4070 Distillation System Type "J" 70 mm 8 to 16 L 12 to 24 L 102/75 115 V
500270-4225 Distillation System Type "J" 25 mm 1 to 2 L 2 to 3 L 35/25 230 V
500270-4236 Distillation System Type "J" 36 mm 2 to 4 L 3 to 6 L 65/40 230 V
500270-4250 Distillation System Type "J" 50 mm 4 to 8 L 6 to 12 L 75/50 230 V
500270-4270 Distillation System Type "J" 70 mm 8 to 16 L 12 to 24 L 102/75 230 V
500270-5025 Distillation System RTD 25 mm 1 to 2 L 2 to 3 L 35/25 115 V
500270-5036 Distillation System RTD 36 mm 2 to 4 L 3 to 6 L 65/40 115 V
500270-5050 Distillation System RTD 50 mm 4 to 8 L 6 to 12 L 75/50 115 V
500270-5070 Distillation System RTD 70 mm 8 to 16 L 12 to 24 L 102/75 115 V
500270-5225 Distillation System RTD 25 mm 1 to 2 L 2 to 3 L 35/25 230 V
500270-5236 Distillation System RTD 36 mm 2 to 4 L 3 to 6 L 65/40 230 V
500270-5250 Distillation System RTD 50 mm 4 to 8 L 6 to 12 L 75/50 230 V
500270-5270 Distillation System RTD 70 mm 8 to 16 L 12 to 24 L 102/75 230 V
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