Dilute sulfuric acid vacuum concentration device and method

A technology of sulfuric acid concentration and vacuum concentration, which is applied in chemical instruments and methods, sulfur compounds, inorganic chemistry, etc., can solve the problems of high reliability requirements, and achieve the effects of good corrosion resistance, energy saving and electricity consumption reduction.

Active Publication Date: 2018-08-03
杭州东日节能技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 3. The sulfuric acid heater of the dilute sulfuric acid vacuum concentration device needs to be resistant to high temperature sulfuric acid corrosion, and has high reliability requirements

Method used

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  • Dilute sulfuric acid vacuum concentration device and method

Examples

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Comparison scheme
Effect test

Embodiment 1

[0035] refer to figure 1 , a dilute sulfuric acid vacuum concentration device, said device includes an acid-acid heat exchanger 1, a primary sulfuric acid concentration tank 2, a secondary sulfuric acid concentration tank 3, a concentrated sulfuric acid circulation tank 4, a circulating concentrated sulfuric acid cooler 5, a primary tail gas Condenser 6, secondary tail gas condenser 7, waste water collection tank 8, multi-stage steam jet vacuum pump unit 9, electric heating steam generating boiler 10 and steam condensed water circulation tank 11, the acid-acid heat exchanger 1 is concentrated with the primary sulfuric acid Groove 2 is connected, and described primary sulfuric acid concentration tank 2 is connected with secondary sulfuric acid concentration tank 3, and described secondary sulfuric acid concentration tank 3 is connected with acid-acid heat exchanger 1, and described acid-acid heat exchanger 1 is connected with The concentrated sulfuric acid circulation tank 4 is...

Embodiment 2

[0046] Refer to Example 1 for the dilute sulfuric acid vacuum concentration device.

[0047] refer to figure 1 , a dilute sulfuric acid vacuum concentration method, comprising the steps of:

[0048] (1) The 75% dilute sulfuric acid clear liquid enters the acid-acid heat exchanger 1 after being pressurized and metered by the dilute sulfuric acid feeding pump 14, and uses the secondary sulfuric acid concentration tank 3 to discharge the residual heat of high-temperature concentrated sulfuric acid to preheat the raw material dilute acid, and then enters a Stage sulfuric acid concentration tank 2. Under vacuum conditions, the acid liquid in multiple concentration chambers in the concentration tank boils and evaporates at a lower temperature, and the concentration increases step by step. The maximum average temperature difference between the acid liquid and the heating tube makes full use of the heating area on the surface of the tantalum tube, so that the sulfuric acid flowing ou...

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Abstract

The invention relates to a dilute sulfuric acid vacuum concentration device and method. The method comprises the following steps: performing metering control on 65-75% of dilute sulfuric acid, enabling the dilute sulfuric acid to enter an acid-acid heat exchanger, preheating the raw material acid by utilizing waste heat of acid discharged by a secondary sulfuric acid thickener, and treating in a primary sulfuric acid thickener; overflowing the treated acid in the secondary sulfuric acid thickener to be treated; enabling acid-containing water vapor produced by the primary sulfuric acid thickener to enter a primary tail gas condenser, overflowing condensed and separated water vapor to enter a wastewater collection tank, and discharging noncondensable gas, acid gas and a small amount of watervapor by a multistage steam jet vacuum pump set and feeding into an accident chlorine tail gas tower to be purified; enabling the acid-containing water vapor produced by the secondary sulfuric acid thickener to enter a secondary tail gas condenser, overflowing the condensed and separated water vapor to enter a wastewater collection tank, and discharging the noncondensable gas, acid gas and a small amount of water vapor by the multistage steam jet vacuum pump set and feeding into the accident chlorine tail gas tower to be purified. The dilute sulfuric acid vacuum concentration device disclosedby the invention has the advantages of being low in cost, low in energy consumption, good in treatment effect, high in reliability, stable in operation and the like.

Description

technical field [0001] The invention relates to a concentration device, in particular to a dilute sulfuric acid vacuum concentration device and method. Background technique [0002] As of December 2017, the total domestic production capacity of caustic soda was about 39 million tons / year (including capacity under construction), and the actual production capacity in 2017 was about 29 million tons / year. At present, domestic chlorine drying devices all adopt the sulfuric acid drying method, and 1 ton of caustic soda consumes about 12-16KG of 98% sulfuric acid. Based on the actual production of caustic soda in 2017, about 348,000 to 464,000 tons of waste sulfuric acid with 75% of the by-product is produced. [0003] In the synthesis of VCM by calcium carbide method, drying and dehydration of hydrogen chloride gas is a very important process. Traditional hydrogen chloride dehydration adopts cryogenic drying process. The main disadvantage of this method is that the hydrogen chlor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/88
CPCC01B17/88Y02P20/129Y02P20/10
Inventor 童新洋仇晓丰邱树锋姜思炜
Owner 杭州东日节能技术有限公司
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