Patent · US Active

Apparatus and method for treating waste water containing ammonium salts

US10829401B2 · kind B2 · utility

0Cited by

0References

27Claims

0Family size

Assignees

CHINA PETROLEUM & CHEMICAL CORPORATION · CN
Sinopec Catalyst Co., Ltd. · CN

Inventors

Xiping Yin · Beijing, CN
Ye Li · Beijing, CN
Songyuan Gu · Beijing, CN
Zhijian Liu · Lo Wu, CN
Tao Wang · Beijing, CN
Jin'ai Gao · Shandong, CN
Yuhua Chen · Palo Alto, US
Yan Zhou · Shandong, CN
Ling Yang · Lianyungang, CN
Zhiwei Yuan · Beijing, CN
Hongliang Yi · 东风镇, CN
Tao An · Shandong, CN
Fuzu Liu · Shandong, CN
Zhimin Zhang · Beijing, CN
Shupeng Xu · Shandong, CN
Hongqi Guo · Shandong, CN

Key dates

Filing date	Aug 28, 2018
Grant date	Nov 10, 2020
Priority date	—
Expiry date	Nov 29, 2038

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC02F2301/08
WIPO fieldEnvironmental technology
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.