Sinochem New Network News
Just after the Spring Festival, Jiangsu Helen Chemical Co., Ltd. sent the banner to the Shengu Group. He Hui, general manager of Helen Company, said that the Drum Group has completed the first large-scale PTA air compressor turnkey project in China, marking the localization of 1.2 million tons of PTA units with an international advanced level.
From Jiangsu Helen Chemical Co., Ltd., the air compressor unit of this project is composed of steam turbine, air compressor and exhaust gas expander. The whole unit is supplied by means of the whole unit, that is, all equipment within 1 meter outside the factory, from installation to commissioning. The completion of all is carried out by Shen drum, which is the turnkey project, which was commissioned in January this year. At present, among the two sets of PA2 developed by the Drum Group, the A unit is fully loaded, and the mechanical performance and aerodynamic performance have reached the design index; the B unit has 90% operating conditions, and the mechanical and aerodynamic performances have reached the design index.
It is understood that at present, almost all air compressor units for PTA installations in China are imported from abroad. Due to the special process, high price and long delivery time, the localization of the core equipment has been a major problem for petrochemical enterprises.
It is reported that when the PTA unit is installed, the 30,000 kW test motor + hydraulic coupler + product reducer + centrifugal compressor + centripetal expander are connected in series, the total length is nearly 30 meters, the total height is nearly 15 meters, creating more The most important items are: designing and manufacturing the largest multi-axis compressor; designing and manufacturing the largest multi-stage expander unit; the trial technical solution is the most difficult, and the motor starting scheme is the most complicated; the unit adopts precise adjustment method and scientific test. The circuit, the compressor and the expander are simultaneously tested to become the most efficient aerodynamic performance test; the first truly complete turnkey project. As the core component of the PTA exhaust expander, the safety and reliability of the nozzle adjustment mechanism is the top priority of the project. The team members solved the difficulties in research and development of high temperature and corrosion resistant oil-free lubricating parts, transmission torque component strength check, etc., and broke through the development of PA2 first-stage nozzle adjustment mechanism. In June 2010, no-load debugging was successful, and all indicators were completely Meet design requirements and international standards. In September 2011, the project entered the commissioning phase and was successfully commissioned before the Spring Festival in 2012.
Su Yongqiang, chairman and general manager of the Drum Group, said that after the successful operation of the unit, it will not only be of great significance to the development of the PTA equipment market, but also have a groundbreaking significance for China’s occupation of the large-scale air separation assembled compressor market, and will further enhance China. The overall competitiveness of the PTA unit.
Thiocyanate (also known as rhodanide) is the anion [SCN]−. It is the conjugate base of thiocyanic acid. Common derivatives include the colourless salts potassium thiocyanate and sodium thiocyanate. Organic compounds containing the functional group SCN are also called thiocyanates. Mercury(II) thiocyanate was formerly used in pyrotechnics.
Thiocyanate is analogous to the cyanate ion, [OCN]−, wherein oxygen is replaced by sulfur. [SCN]− is one of the pseudohalides, due to the similarity of its reactions to that of halide ions. Thiocyanate used to be known as rhodanide (from a Greek word for rose) because of the red colour of its complexes with iron. Thiocyanate is produced by the reaction of elemental sulfur or thiosulfate with cyanide
Thiocyanate[4] is known to be an important part in the biosynthesis of hypothiocyanite by a lactoperoxidase.[5][6][7] Thus the complete absence of thiocyanate[8] or reduced thiocyanate[9] in the human body, (e.g., cystic fibrosis) is damaging to the human host defense system.[10][11]
Thiocyanate is a potent competitive inhibitor of the thyroid sodium-iodide symporter.[12] Iodine is an essential component of thyroxine. Since thiocyanates will decrease iodide transport into the thyroid follicular cell, they will decrease the amount of thyroxine produced by the thyroid gland. As such, foodstuffs containing thiocyanate are best avoided by Iodide deficient hypothyroid patients.[13]
In the early 20th century, thiocyanate was used in the treatment of hypertension, but it is no longer used because of associated toxicity.[14] Sodium nitroprusside, a metabolite of which is thiocyanate, is however still used for the treatment of a hypertensive emergency. Rhodanese catalyzes the reaction of sodium nitroprusside with thiosulfate to form the metabolite thiocyanate
Our main Thiocyanates are Sodium Thiocyanate, Potassium Thiocyanate, Ammonium Thiocyanate.
Sodium Thiocyanate, Potassium Thiocyanate,ammonium thiocyanate
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