The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 10, 2020
Filed:
Aug. 28, 2018
China Petroleum & Chemical Corporation, Beijing, CN;
Sinopec Catalyst Co., Ltd., Beijing, CN;
Xiping Yin, Beijing, CN;
Ye Li, Beijing, CN;
Songyuan Gu, Beijing, CN;
Zhijian Liu, Beijing, CN;
Tao Wang, Beijing, CN;
Jin'ai Gao, Shandong, CN;
Yuhua Chen, Shandong, CN;
Yan Zhou, Shandong, CN;
Ling Yang, Shandong, CN;
Zhiwei Yuan, Beijing, CN;
Hongliang Yi, Beijing, CN;
Tao An, Shandong, CN;
Fuzu Liu, Shandong, CN;
Zhimin Zhang, Shandong, CN;
Shupeng Xu, Shandong, CN;
Hongqi Guo, Shandong, CN;
China Petroleum & Chemical Corporation, Beijing, CN;
Sinopec Catalyst Co., Ltd., Beijing, CN;
Abstract
In a method for treating waste water containing ammonium salts, sodium sulfate crystal is obtained by freezing crystallization, then the pH value of the waste water is adjusted to a specific range, and next sodium chloride crystal and ammonia water is obtained by evaporation. Alternatively, the pH value of the waste water is adjusted to a specific range, then sodium chloride crystal and ammonia water is obtained by evaporation, and next sodium sulfate crystal is obtained by freezing crystallization. This method can recover ammonia, sodium sulfate, and sodium chloride from the waste water.