Phenols have a 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 TEC
offers the technology of crude phenol purification with the phenol either from
coking phenol, or gasified phenol or alkylation liquid. Based on the facts that
the boiling points of the main product and the by-products are quite different @
certain condition and the boiling points will decrease with the reducing of the
pressure, SL TEC's technology lowers the separation temperature by reducing the
system system, distill, separate and purify to get high purity phenol
separately.
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 TEC 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:
1.
The yield and the product quality is obviously advanced.
2. Thks 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.
3. It
successfully separates sulfuric acid and heavy components phenol to realize the
100% recovery of sulfuric acid, thereby the consumption is largely redyced;
meanwhile graphite reactor and glamel reaction equipment are employed, which
avoids the corrosion of sulfuric acid catalyst to the equipment and therefore
decreases the equipment investment.
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