The alfamethylstyrene fraction is a by-product of the production of phenol and acetone via isopropylbenzene hydroperoxide (cumene method). It is used for the production of commercial α-methylstyrene and other purposes.
| PARAMETER NAME | FRACTION SORTS | Top grade | First grade | Second grade |
|---|
| Looks of the substance | Colourless or pale yellow transparent liquid | A colourless or yellow transparent liquid | A colourless or yellow transparent liquid |
| α-methylstyrene content, %, min. | 99.0 | 95.0 | 90.0 |
| N-propylbenzene and styrene content, % wt. max | 0.2 | 0.5 | 0.7 |
| Phenol content, % wt. max. | – | 0.001 | 0.002 |
| Presence of polymer for stabilised α-methylstyrene fraction shall withstand the test | Not regulated | Not regulated | Not regulated |
| Light refraction index at 20°C | 1.580-1.5390 | 1.5360-1.5388 | 1.5320 |
| Note | If a phenolic stabiliser is added, the total phenol and stabiliser content in terms of phenol for the top grade must not exceed 0.002%, for grades 1 and 2 not more than 0.003%. |
| Packaging, transport and storage: | Alfamethylstyrene fraction is transported in bulk in tank wagons and bunker wagons for the transport of petroleum bitumen. |
