Levels of isobutane polymerization solvent

Levels polymerization solvent polymerization solvent isobutane isobutane is oil hydrocracking process, the by-product of the liquefied petroleum gas fractions, hydrofining, desulfurization and distillation technology, has high purity, low sulfur and low olefin, mainly used in slurry with loop method in the production of high density polyethylene used as a polymerization solvent, and can be used to replace CFC refrigerants. At present, the typical isobutane production process there are three main kinds of the common ground is in hydrocracking liquefied petroleum gas as raw material, one is from liquefied petroleum gas using Y type molecular sieve adsorption removal of impurity separation of high purity isobutane method; The second is the desulfurization and isobutane gas separation device production; 3 it is temperature swing adsorption purification isobutane processes. Three production processes each have advantages and disadvantages. Using Y type molecular sieve adsorption process is simple, the separation process are normal temperature operation, convenient operation, process safety reliability. Defect product purity of isobutane is not high. Using desulfurization and gas separation device production butyl liuheyuan advantage is can use an existing gas separation device, save investment, but the disadvantage is that the product high olefin content problem cannot be solved. Purity of temperature swing adsorption purification technology advantage is available for 99. 599. 9% of isobutane products, but because of the lack of desulfurization and olefin process, lead to the total sulfur and olefin content of isobutane still cannot meet the requirements of the polymerization solvent level. In recent years, in view of the above advantages and disadvantages of several kinds of production technology, in terms of technology, there is no improvement.

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