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Method for treating salt-bearing waste sulfuric acid

A treatment method and technology for waste sulfuric acid, applied in the direction of sulfur trioxide/sulfuric acid, energy input, etc., can solve the problems of incomplete treatment of salt substances, low product quality, high treatment cost, and achieve good economic and social benefits, The effect of large waste acid treatment capacity and simple process operation

Inactive Publication Date: 2017-05-10
JIANGSU KERUI ENG DESIGN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These treatment methods have problems such as complicated process, high treatment cost, low product quality, and incomplete treatment of salt substances.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for cracking waste sulfuric acid containing salt with natural gas as fuel, comprising the following steps:

[0025] Step 1: After fully mixing the stabilized natural gas and the air preheated to 700°C in the burner, ignited by the ignition gun and sprayed into the furnace to form a spindle-shaped flame area;

[0026] Step 2: When the temperature of the furnace rises to 1000°C, the waste sulfuric acid containing salt with a concentration of 80% is transported by a high-pressure pump to transport mechanical atomization and compressed air-assisted atomization, so that the waste sulfuric acid is atomized to form an acid mist and then sprayed. into the cracking furnace. The atomized waste sulfuric acid is cracked in the high-temperature environment in the furnace to generate flue gas containing sulfur dioxide, sulfur trioxide, carbon dioxide, water smoke, etc., which enters the subsequent acid system after recovery of waste heat. The separation of salt is divided i...

Embodiment 2

[0029] A method for cracking waste sulfuric acid containing salt with natural gas as fuel, comprising the following steps:

[0030] Step 1: After fully mixing the stabilized natural gas and the air preheated to 700°C in the burner, ignited by the ignition gun and sprayed into the furnace to form a spindle-shaped flame area;

[0031] Step 2: When the temperature of the furnace rises to 1200°C, the waste sulfuric acid containing salt with a concentration of 89% is transported by a high-pressure pump to combine mechanical atomization with compressed air assisted atomization, so that the waste sulfuric acid is atomized to form an acid mist and then sprayed. into the cracking furnace. The atomized waste sulfuric acid is cracked in the high-temperature environment in the furnace to generate flue gas containing sulfur dioxide, sulfur trioxide, carbon dioxide, water smoke, etc., which enters the subsequent acid system after recovery of waste heat. The separation of salt is divided in...

Embodiment 3

[0034] A method for cracking waste sulfuric acid containing salt with natural gas as fuel, comprising the following steps:

[0035]Step 1: After fully mixing the stabilized natural gas and the air preheated to 700°C in the burner, ignited by the ignition gun and sprayed into the furnace to form a spindle-shaped flame area;

[0036] Step 2: After the temperature of the furnace rises to 1500°C, the waste sulfuric acid containing salt with a concentration of 90% is transported by a high-pressure pump to combine mechanical atomization with compressed air assisted atomization, so that the waste sulfuric acid is atomized to form an acid mist and then sprayed. into the cracking furnace. The atomized waste sulfuric acid is cracked in the high-temperature environment in the furnace to generate flue gas containing sulfur dioxide, sulfur trioxide, carbon dioxide, water smoke, etc., which enters the subsequent acid system after recovery of waste heat. The separation of salt is divided in...

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Abstract

The invention relates to a cracking technology for recovering and treating salt-bearing waste sulfuric acid. The cracking technology includes feeding the salt-bearing waste sulfuric acid, air and fuel for providing heat required by cracking into a cracking furnace, enabling the waste sulfuric acid to undergo cracking reaction in the cracking furnace to generate mixed furnace gas containing sulfur dioxide, molten salt droplets, sulfur trioxide, carbon dioxide, water vapor, nitrogen and smoke dust, removing part of the molten salt droplets in the furnace gas through the trapping effect of a retaining wall in the furnace, removing another part of the molten salt droplets in the furnace gas through phase change after a heat exchanger is cooled, and enabling desalted furnace gas to enter a subsequent acid preparation system after heat exchange so as to obtain a sulfuric acid finished product. According to the cracking technology, the cracking rate of the waste sulfuric acid is near 100%, and the salt separation recovery rate is near 100%. The method has good economic and social benefits.

Description

technical field [0001] The invention belongs to the technical field of chemical engineering and environmental protection, and in particular relates to a cracking process for recycling waste sulfuric acid containing salt. Background technique [0002] All kinds of related chemical devices in my country, such as esterification, sulfonation, hydration and hydrolysis, etc., will produce a large amount of waste sulfuric acid by-product every year, especially in the production process of dyestuffs and dyestuff intermediate devices of many domestic dyestuff manufacturers. A certain amount of waste sulfuric acid is produced. The waste sulfuric acid has high salt content and many types of salts, which are difficult to handle. In addition to 70-80% sulfuric acid, it also contains a small amount of organic matter and water. At present, the treatment methods of waste sulfuric acid mainly include the following types: 1. Alkali neutralization method, neutralizing waste sulfuric acid with v...

Claims

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Application Information

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IPC IPC(8): C01B17/90
CPCY02P20/129C01B17/90
Inventor 吴英来魏兰江碧清陈英斌赵建鑫徐晓燕张雪杰
Owner JIANGSU KERUI ENG DESIGN CO LTD
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