Method for preparing chlorosulfonic acid by regenerating high COD (Chemical Oxygen Demand) salt-containing diluted acid
A technology of chlorosulfonic acid and dilute acid, which is applied in the direction of chlorosulfonic acid, sulfur-halogen-hydrogen-oxygen compounds, energy input, etc., can solve the problems of high cost, environmental pollution, resource waste, etc., and achieve equipment cost reduction and environmental protection Obvious advantages and obvious effects
Active Publication Date: 2018-12-21
泰兴锦汇化工有限公司
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[0005] The above-mentioned methods are not only costly, but also may cause environmental pollution or waste of resources.
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[0039] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0040] The invention discloses a method for regenerating high-COD salt-containing dilute acid to prepare chlorosulfonic acid, comprising three main steps of dilute acid concentration, dilute acid cracking and chlorosulfonic acid synthesis.
[0041] (1) Dilute acid concentration, if attached figure 1 Shown:
[0042] 20%-50% by-product dilute sulfuric acid and acid water provided by the production section are collected and temporarily stored in the dilute acid storage tank 1 . After clarification, it is sent to the concentration system by the dilute acid feed pump 2. After the first-stage preheater 3 and the second-stage preheater 4 are heated to 80-85°C, it enters the third-stage evaporation system 5 for concentration. The three-stage evaporation system 5 includes a first-effect heater 5a, a first-effect evaporator 5b, a first-effect forced circulatio...
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The invention relates to a method for preparing chlorosulfonic acid by regenerating a high COD (Chemical Oxygen Demand) salt-containing diluted acid. The method comprises the following steps: concentrating a diluted acid, namely carrying out evaporation concentration on waste liquids of dilute sulfuric acid provided by different production sections till a final concentration of sulfuric acid is greater than or equal to 70%; carrying out diluted acid pyrolysis, namely decomposing the sulfuric acid concentrated in the step (1) through heat generated when sulfur and natural gases are combusted, carrying out waste heat recycling and flue gas purification on a generated high-danger flue gas, carrying out twice conversion and twice absorption in a '3+2' mode so as to obtain 105% sulfuric acid and 98% sulfuric acid; synthesizing chlorosulfonic acid, namely evaporating the 105% sulfuric acid by using the waste heat generated in the step (2) to prepare a sulfur trioxide gas, and enabling the gas sulfur trioxide to react with a hydrogen chloride gas, so as to obtain a finished product of chlorosulfonic acid. The method is simple in process procedure, simple to operate and remarkable in effect, and treatment results can be optimized.
Description
technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a method for preparing chlorosulfonic acid by regeneration of high-COD salt-containing dilute acid. Background technique [0002] Sulfuric acid is widely used in chemical, steel and other industries. In many production processes, the utilization rate of sulfuric acid is very low, and a large amount of sulfuric acid is discharged along with acid-containing wastewater. If the waste water is discharged into the environment without treatment, it will not only acidify the water body or soil, cause harm to the ecological environment, but also waste a lot of resources. [0003] In many organic reactions, especially in the synthesis of dyes, concentrated sulfuric acid is often used as a catalyst or solvent. In these organic reactions, concentrated sulfuric acid itself does not participate in the reaction, and is finally discharged as 30-50%wt waste acid water,...
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IPC IPC(8): C01B17/46
CPCC01B17/466Y02P20/129
Inventor 赵卫国吴玉生
Owner 泰兴锦汇化工有限公司