Title:
SYSTEM AND METHOD FOR RESOURCE RECYCLING OF SULFUR DIOXIDE
Document Type and Number:
WIPO Patent Application WO/2021/114561
Kind Code:
A1
Abstract:
Provided are a system and a method for resource recycling of sulfur dioxide. The system comprises a charcoal reduction furnace (1), a high temperature dust remover (2), a cooling separator A (3), a liquid sulfur tank (4), a cooling separator B (5), a tail gas absorption tower (6), a gas stripping tower (7) ), a hypo reactor (8), a centrifuge (9), a mother liquor tank (10) and a thickener (11). The method comprises the following steps: (1) preparing elemental sulfur, (2) removing dust from a process gas containing gaseous sulfur, (3) separating elemental sulfur, (4) reabsorbing residual SO 2 gas, (5) purifying sulfur powder, (6) preparing a slurry of cured hypo, (7) performing liquid-solid separation, and (8) preparing an absorption slurry. According to the method, SO 2 gas is reduced into liquid sulfur and sulfur powder, and sodium thiosulfate is coproduced. As such, the method avoids the problem of pollution resulting from a by-product in the process of producing sulfur from SO 2 and generates no wastewater. The method also solves the problem of low primary conversion rate in the production of sulfur from SO 2 gas. Further, the method can reduce overall investments on the system and increase operational flexibility of the system, making possible the practical application of the technology of sulfur production from SO 2.
Inventors:
XU HAITAO (CN)
XU YANZHONG (CN)
LI MINGBO (CN)
CHEN RENYUAN (CN)
LIU DAHUA (CN)
WU ZHENSHAN (CN)
SONG JING (CN)
XU MENG (CN)
XU YANZHONG (CN)
LI MINGBO (CN)
CHEN RENYUAN (CN)
LIU DAHUA (CN)
WU ZHENSHAN (CN)
SONG JING (CN)
XU MENG (CN)
Application Number:
PCT/CN2020/089515
Publication Date:
June 17, 2021
Filing Date:
May 10, 2020
Export Citation:
Assignee:
NANJING GEKOF INSTITUTE OF ENVIRONMENTAL PROTECTION TECH & EQUIPMENT CO LTD (CN)
NANJING UNIVERSITY OF TECHNOLOGY (CN)
JIANGSU DEYITONG ENVIRONMENTAL PROTECTION TECH CO LTD (CN)
NANJING LIUYAN ENVIRONMENTAL PROTECTION TECH CO LTD (CN)
NANJING UNIVERSITY OF TECHNOLOGY (CN)
JIANGSU DEYITONG ENVIRONMENTAL PROTECTION TECH CO LTD (CN)
NANJING LIUYAN ENVIRONMENTAL PROTECTION TECH CO LTD (CN)
International Classes:
C01B17/04; C01B17/64; C01D5/14
Domestic Patent References:
| WO2017004712A1 | 2017-01-12 |
Foreign References:
| CN104071759A | 2014-10-01 | |||
| CN106809807A | 2017-06-09 | |||
| CN106467293A | 2017-03-01 | |||
| CN105271132A | 2016-01-27 |
Other References:
HAN JIANLING: "Sulfur recovery from sulfur refinery waste gas", HUAXUE SHIJIE (CHEMICAL WORLD), vol. 03, 7 March 1960 (1960-03-07), pages 148, XP055822726
Attorney, Agent or Firm:
NANJING RUIZHIBO INTELLECTUAL PROPERTY AGENCY CO., LTD. (CN)
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