Table 1 Summary of the results obtained
Solvent evaporation method | |||
|---|---|---|---|
Concentration (g sulphanilamide/ml solvent) | Stirring rate (rpm) | Time (h) | Result |
Methanol solvent system | |||
Irrespective of the concentration, no needles or crystals were observed when the solution was evaporated for 12 h | |||
0.04 | 0 | 24 | Needles |
0.05 | 0 | 24 | Needles |
0.058 | 0 | 24 | Small cube-shaped crystals |
0.065 | 0 | 24 | Small cube-shaped crystals |
0.04 | 0 | 48 | Short needles |
0.05 | 0 | 48 | Long needles |
0.058 | 0 | 48 | Cube-shaped crystals |
0.065 | 0 | 48 | Large crystals |
0.04 | 0 | 72 | Needles |
0.05 | 0 | 72 | Needles |
0.058 | 0 | 72 | Large cube-shaped crystals |
0.065 | 0 | 72 | Large cube-shaped crystals |
Irrespective of the concentration and time, no needles or crystals were observed when the solution was evaporated with a stirring speed of 100 rpm | |||
Ethanol solvent system | |||
Irrespective of the concentration, no needles or crystals were observed when the solution was evaporated for 12 h | |||
0.019 | 0 | 24 | No crystals |
0.024 | 0 | 24 | No crystals |
0.032 | 0 | 24 | Needles |
0.041 | 0 | 24 | Needles |
0.019 | 0 | 48 | Very small needles |
0.024 | 0 | 48 | Very small needles |
0.032 | 0 | 48 | Small needles |
0.041 | 0 | 48 | Very small crystals |
Irrespective of the concentration and time, no needles or crystals were observed when the solution was evaporated with a stirring speed of 100 rpm | |||
Solvent evaporation method | |||
Concentration(g sulphanilamide/ml solvent) | Stirring rate(rpm) | Time (h) | Result |
Acetone solvent system | |||
Irrespective of the concentration, no needles or crystals were observed when the solution was evaporated for 12 h with and without stirring | |||
0.1016 | 0 | 24 | Needles |
0.1383 | 0 | 24 | Needles |
0.1826 | 0 | 24 | Small cuboidal crystals |
0.218 | 0 | 24 | Small cuboidal crystals |
0.102 | 100 | 24 | Needles |
0.138 | 100 | 24 | Needles |
0.183 | 100 | 24 | Needles |
0.218 | 100 | 24 | Very small crystals |
Cooling method | |||
Methanol solvent system | |||
0.04 | 0 | 4 | No crystals |
0.05 | 0 | 4 | No crystals |
0.058 | 0 | 4 | No crystals |
0.065 | 0 | 4 | Very small crystals |
0.04 | 0 | 6 | No crystals |
0.05 | 0 | 6 | No crystals |
0.058 | 0 | 6 | Very small crystals |
0.065 | 0 | 6 | Very small crystals |
Irrespective of the concentration and time, no needles or crystals were observed when the solution was cooled with a stirring speed of 100 rpm | |||
Ethanol solvent system | |||
No needles or crystals were observed | |||
Acetone solvent system | |||
No needles or crystals were observed | |||