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Technology for concentrating dilute sulfuric acid with multi-effect evaporation

A technology of multi-effect evaporation and dilute sulfuric acid, which is applied in the field of multi-effect evaporation and concentration of dilute sulfuric acid, can solve the problems of environmental pollution, high energy consumption for sulfuric acid concentration, and reduction of sulfuric acid concentration.

Inactive Publication Date: 2012-02-08
钱尉兵
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The concentration of used sulfuric acid is usually reduced and cannot be used for production. This part of waste acid is often treated as waste water, which wastes resources.
In the past, there was also a sulfuric acid concentration process, but due to the strong corrosiveness of sulfuric acid, the concentration process was often unfeasible, and because of the high energy consumption of sulfuric acid concentration, the recovery value was not high, causing most users to prefer to treat it as waste. Some enterprises even discharge directly without treatment, polluting the environment

Method used

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  • Technology for concentrating dilute sulfuric acid with multi-effect evaporation
  • Technology for concentrating dilute sulfuric acid with multi-effect evaporation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] For example, 10 tons / hour of 30% sulfuric acid is concentrated to 70% sulfuric acid. The 30% sulfuric acid can be concentrated to about 40% in the first effect heater, and then further concentrated to 70% by the second effect. Heating to above 140 degrees Celsius, and the vacuum degree of the second effect is below -0.08MPa. The steam consumption of the second effect is about 3.2 tons / hour, and about 3 tons / hour of secondary steam is generated as the heat source of the first effect, so that the evaporation capacity of the first effect is 2.7 tons / hour, and the generated secondary steam of about 2.2 tons / hour is used as The heat source of the preheater heats the raw material to above 100 degrees Celsius. Considering the entrainment loss of materials, the final product acid yield is about 95%, and 4 tons / hour of 70% sulfuric acid can be obtained. The acid is cooled with water at 20 degrees Celsius through a cooler to obtain a product acid at about 35 degrees Celsius. S...

Embodiment 2

[0016] For example, 50 tons / hour of 25% sulfuric acid is concentrated to 70% sulfuric acid. The 25% sulfuric acid can be concentrated to about 39% in the first effect heater, and then further concentrated to 70% by the second effect. Heating to above 140 degrees Celsius, and the vacuum degree of the second effect is below -0.08MPa. The steam consumption of the second effect is about 19 tons / hour, and about 18 tons / hour of secondary steam is generated as the heat source of the first effect, so that the evaporation capacity of the first effect is 17 tons / hour, and the generated secondary steam of about 14 tons / hour is used as the heat source of the first effect. The heat source of the preheater heats the raw material to above 100 degrees Celsius. Considering the entrainment loss of materials, the final product acid yield is about 95%, and 17 tons / hour of 70% sulfuric acid can be obtained. The acid is cooled with water at 20 degrees Celsius through a cooler to obtain a product ...

Embodiment 3

[0018] For example, if 50 tons / hour of 20% sulfuric acid is concentrated to 70% sulfuric acid, the 25% sulfuric acid can be concentrated to about 31% in the first effect heater, and then further concentrated to 70% by the second effect, and the raw steam gauge pressure of the second effect At about 0.5Mpa, the temperature is close to 160°C, the material is heated to above 140°C in the second effect, and the vacuum degree of the second effect is below -0.08MPa. The steam consumption of the second effect is about 20 tons / hour, and about 18.7 tons / hour of secondary steam is generated as the heat source of the first effect, so that the evaporation capacity of the first effect is 17.5 tons / hour, and about 17 tons / hour of secondary steam is generated as The heat source of the preheater heats the raw material to above 100 degrees Celsius. Considering the entrainment loss of materials, the final product acid yield is about 95%, and 13.5 tons / hour of 70% sulfuric acid can be obtained. ...

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Abstract

The invention discloses a technology for concentrating dilute sulfuric acid with multi-effect evaporation. The method comprises the following steps: 1, heating with a first-effect heater after preheating dilute sulfuric acid with a preheater, and heating with a second-effect heater to prepare concentrated sulfuric acid; and 2, cooling by allowing generated concentrated sulfuric acid to go through a cooler to prepare products concentrated sulfuric acid. Sulfuric acid is concentrated with graphite equipment. Energy consumed by multi-effect evaporation adopted in the invention accounts for 40% of energy consumed by single-effect evaporation. The degree of the sulfuric acid concentration of the technology reaches 70%.

Description

technical field [0001] The invention relates to a dilute sulfuric acid multi-effect evaporation concentration process. Background technique [0002] Sulfuric acid, known as "industrial petroleum", is one of the main chemical raw materials. It is often used as a dehydrating agent and intermediate reaction in industry. The concentration of used sulfuric acid is usually reduced and cannot be used for production. This part of waste acid is often treated as waste water, which wastes resources. In the past, there was also a sulfuric acid concentration process, but due to the strong corrosiveness of sulfuric acid, the concentration process was often unfeasible, and because of the high energy consumption of sulfuric acid concentration, the recovery value was not high, causing most users to prefer to treat it as waste. Some enterprises even discharge directly without treatment, polluting the environment. Contents of the invention [0003] Purpose of the invention: In order to sol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/88B01D1/26
Inventor 唐正勇
Owner 钱尉兵
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