Sir, please come in. What material would be suitable?
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Approximately 12 m3 is produced at a time, containing 6–8% liquid alkali; the phenol content (based on phenol) is around 10–11%, with a temperature of 40–50°C. The mixture is then acidified using 98% sulfuric acid to a pH of 3. The upper phenol oil layer is separated and recovered, while the liquid remaining after acidification is cooled and crystallized to yield sodium sulfate. The liquid left after this separation is then evaporated and concentrated. 1. What material should be used for the acidification tank? Can 316L handle it? 2. Can sodium sulfate used for acid adjustment and phenol be precipitated?
At this temperature, fiberglass-reinforced plastic or plastic lining on carbon steel can be considered.
Lining with plastic isn’t feasible; moreover, phenol oil is released – could this dissolve the plastic?
Thank you for sharing; giving roses leaves a pleasant fragrance in one’s hands
1. It is appropriate to use 316L stainless steel for acid digestion reactors, as 316L possesses excellent corrosion resistance and high-temperature tolerance, enabling it to withstand the erosion of strong acids such as sulfuric acid. 2. After acidification, sodium sulfate and phenol can be precipitated out. When the pH value is reduced to 3, it facilitates the separation of phenol; meanwhile, sodium sulfate also precipitates under certain conditions. The specific effects still need to be verified based on operating conditions and concentration. .
1. Selection of material for the acidification tank (whether 316L is suitable). Operating conditions: An initial solution containing 6–8% liquid alkali (NaOH), which is later adjusted to pH=3 (strongly acidic) using 98% sulfuric acid. Contains 10-11% phenol; temperature: 40-50°C. Sodium sulfate crystals and possible by-products (such as small amounts of sulfonated organic compounds) are present in the system. Applicability of 316L stainless steel: Advantages: 316L in dilute sulfuric acid at room temperature (
Why not consider using an enamel kettle?