Phenols have variety of compounds, with the most important ones incl. phenol (carbonic acid), and cresol (o-cresol, m-cresol and p-cresol); among them, phenol is mainly used as the feedstock for di-phenol A production and phenol formaldehyde production; o-cresol is widely used in the synthesis of resin, pesticide, medicine, perfume, dyes, antioxidant and etc. M-cresol is an very important feedstock for the production of Vitamin E. P-cresol is widely applied in the synthesis of BHT, the most employed antioxidant in the world.SL-TECH offers the technology of crude phenol purification with phenol either from coking phenol, gasified phenol or alkylation liquid.
Technical Features
In the traditional crude phenol purification process, usually water removing, residue removing, phenol purification units in batch are involved to separate and purify phenol, cresol and other products. In this batch production, the intermediate distillate between adjacent components requires repeated rectification to increase the yield, thereby the productivity is low, the energy consumption is low and only suitable for small production capacity. In addition, as the phenol products have certain heat sensitivity, the repeated heating not only decreases the total yield but also results in the unstable product quality. While SL-TECH provides a technology based on the achievements by cooperation with Tianjin University. It is based on continuous vacuum distillation, uses DCS control system to optimize operation. Its advantages include the followings:
● The yield and the product quality is obviously advanced.
● Thanks to the auto-protection and chain shutdown system, the production is very stable, the product quality is also stable and the production flexibility is big.
● It successfully separates sulfuric acid and heavy components phenol to realize the 100% recovery of the sulfuric acid, thereby the consumption is largely reduced. Meanwhile graphite reactor and glamel reaction equipment are employed, which avoid the corrosive of sulfuric acid catalyst to the equipment and therefore decreases the equipment investment.
Product Specification
Phenol product
S/N |
Item |
Index |
1 |
Crystallization Point, ℃ |
40.6 |
2 |
Solubility Test [(1+2) absorbance] |
0.03 |
3 |
Moisture, wt% |
0.1 |
Cresol product
S/N |
Item |
Index |
|
|
o-cresol |
m-cresol and p-cresol |
Industrial Cresol |
1 |
Appearance |
White to light tawny crystal |
Colorless to brown transparent liquid |
Colorless to chocolate-brown transparent liquid |
2 |
Density @20℃,g/cm³ |
/ |
1.03-1.04 |
1.03-1.05 |
3 |
Moisture, wt% ≤ |
0.3 |
0.3 |
1 |
4 |
Neutral Oil Test (Turbidimetric method), # ≤ |
2 |
10 |
10 |
5 |
Phenol content, wt% ≤ |
/ |
5 |
/ |
6 |
o-cresol, wt% ≥ |
99 |
/ |
/ |
7 |
2,6-xylenlo, wt% ≤ |
/ |
/ |
/ |
8 |
m-cresol,wt% ≥ |
/ |
50 |
41 |
9 |
Cresol+Xylenlo,wt% ≥ |
/ |
/ |
60 |
10 |
Tricresol,wt% ≤ |
/ |
/ |
5 |
Note 1: In liquid state, o-cresol is colorless or slightly colored transparent liquid. |
Note 2: Cresol includes all isomers of C7H8O, and xylenol includes all isomers of C8H10O.
|
Note 3: Tricresol includes all isomers of C9H12O.
|