Method for preparing anhydrous sodium hydrogen sulfate by using ethephon production waste liquid

• Main Authors: DING CHENGRONG, YANG HUADONG, JI XIAOYING, JI GUOYAN, JI GUOYAO, LV JIANHUI, ZHANG GUOFU
• Format: Patent
• Language: Chinese; English
• Published: 17.08.2011
• Subjects: CHEMISTRY; COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM,RUBIDIUM, CAESIUM, OR FRANCIUM; INORGANIC CHEMISTRY; METALLURGY

The invention provides a method for preparing anhydrous sodium hydrogen sulfate by using ethephon production waste liquid. The method comprises the following steps of: in the section of producing hydrogen chloride from ethephon, steaming out the residual hydrogen chloride from the waste liquid discharged during production of the hydrogen chloride by using sodium chloride and concentrated sulfuric acid which serve as raw materials at the temperature of 70 to 85 DEG C and the vacuum degree of 0.05 to 0.08MPa and under reduced pressure, and adjusting the acidity of the waste liquid to 38 to 41 percent by using anhydrous sodium sulphate; distilling to remove and dissolve free water at the temperature of 90 to 120 DEG C and the vacuum degree of 0.08 to 0.09MPa and under reduced pressure, and removing crystal water at the temperature of 130 to 195 DEG C and the vacuum degree of 0.09 to 0.099MPa; and finally granulating by atomizing so as to obtain spherical anhydrous sodium hydrogen sulfate. By the method, the prod