Login Username or Email: Engineering controls which are incorporated into processes include reducing flammable vapour concentrations by ventilation, dilution and inerting. The valves 41 and 43 are closed during normal stripping operation of the system, and are only open during the heat exchanger cleaning operation. In catalytic hydrodesulphurization, the feedstock is de-aerated, mixed with hydrogen, preheated and charged under high pressure through a fixed-bed catalytic reactor. The two types of towers are counterflow and crossflow.
The following measures are considered effective safeguards in the materials selection process of pipes intended for sour applications: For instance, a high concentration of NaOH destroys the passive film on the heat transfer surface and exposes iron which reacts directly with sodium hydroxide to form the destructive. The main fractionator overhead goes to a depropanizer. Sodium stearate is often used for better release from mill rolls or molds. Other treatment methods include crude desalting, chemical sweetening, acid treating, clay contacting, hydrodesulphurizing, solvent refining, caustic washing, hydrotreating, drying, solvent extraction and solvent dewaxing. The sulfur stripper can be practically any sulfur stripper used or known by those of ordinary skill in the art for the removal of sulfur.
Login to access the Oil & Gas Journal Subscriber Premium features.
The solvent is recovered from the dewaxed raffinate by flashing and steam stripping, and recycled. Process temperatures, which affect sensor life, can be quite high in order to facilitate removal of the unwanted components. Moreover, an embodiment can have a single A or a plurality of A. During the degasification stage the sour water feed from the plant is cooled and fed to a degasser where dissolved hydrogen, methane and other light hydrocarbons are removed. Some of these liquid fractions are stripped of their lighter ends, which are returned to the tower as downflowing reflux streams. When sour high sulphur crudes are processed, there may be potential exposure to hydrogen sulphide in the preheat exchanger and furnace, tower flash zone and overhead system, vacuum furnace and tower, and bottoms exchanger. Dry-cleaning solvents Heavy naphthas Military jet fuel.
Inhalation of hydrocarbon gases and vapours, aromatic naphtha containing benzene, hydrogen sulphide and hydrogen-rich process gas is a hazard. Sign up for free if you are not a member already. Sour water stripping Stripping hydrogen sulfide and ammonia from refinery sour water prior to subsequent reuse or wastewater treatment calls for highly reliable, corrosion-resistant, low-fouling equipment. Moreover, higher grades of material are readily available upon request. Email - admin enggcyclopedia.