- 生产国中国
O-Dihydroxybenzene Plant
Proprietary Technology and Plants
Technology Introduction:
There are over 10 methods for hydroquinone production, and among them the prevailings are Aniline Oxidation Process, p-DIPB Excess Oxidation Process and Phenol Hydroxylation Process. Their comparisons are shown in the following table. SL TECH's technology is based on Phenol Hydroxylation Process, in which phenol feedstock reacts with hydrogen peroxide in presence of catalyst to yield o-dihyoxybenzene and p-dihyoxybenzene. After removing water, high boiling point substances, phenol and separating out o-dihydroxybenze, crude p-dihyoxybenze is obtained and then charged for dissolving, discoloring, recrystallization before getting hydroquinone product.
Technical Features:
S/N |
Production Process |
Technical Advantages/Disadvantages |
|
Aniline Oxidation Process |
easy operation, but high consumption and low yield |
|
p-DIPB Excess Oxidation Process |
Less side products, high conversion yield, but difficult in selecting the catalyst system |
|
Phenol Hydroxylation Process |
Low production cost, high yield, less pollution but with complicated separation |
Performance:
Product Specification
S/N |
Item |
Index |
|
Superior Grade |
Acceptable Grade |
||
1 |
p-dihyoxybenzene, wt% |
99.0-100.5 |
|
2 |
o-dihyoxybenzene, wt%, ≦ |
0.05 |
|
3 |
finished melting point, oC, ≦ |
171-175 |
|
4 |
Burning residue, wt%, ≦ |
0.10 |
0.30 |
5 |
Heavy metal(as per Pb), wt5, ≦ |
0.002 |
- |
6 |
Iron(as per Fe), wt%, ≦ |
0.002 |
- |
7 |
Solubility Test |
Passed test |
- |
Specific Consumption
S/N |
Item |
Consumption Rate |
1 |
Phenol (mt/mt @ per ton of 99.0% p-dihyoxybenzene) |
1.07 |
2 |
70% Hydrogen Peroxide |
0.634 |
3 |
Catalyst (kg / kg @ per ton of 99.0% p-dihyoxybenzene) |
15 |
4 |
3.8MPa Steam ((mt/mt @ per ton of 99.0% p-dihyoxybenzene) |
16 |