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Dilute sulfuric acid vacuum concentration system

A vacuum concentration and vacuum system technology, applied in the direction of sulfur trioxide/sulfuric acid, sulfur compounds, inorganic chemistry, etc., can solve problems such as high safety requirements, increased process costs, and incomplete removal of organic matter, so as to avoid blockage, Effect of increasing circulation absorption efficiency

Active Publication Date: 2020-10-16
QINGDAO DOUBLE PEACH SPECIALTY CHEM GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, a variety of methods for recycling industrial waste acid have been developed in the prior art. Among them, the "vacuum concentration method" is a method that is relatively mature, safe, reliable, energy-saving, environmentally friendly and most widely used in industrial applications in dilute sulfuric acid recovery technology. However, for dilute sulfuric acid containing soluble and high-freezing organic matter, organic matter often condenses during the condensation process of the concentrated gas phase, resulting in blockage of scrubbers, condensers and related pipelines, which is still an industrial problem.
[0003] At present, although some anti-clogging methods have been proposed one after another, such as the pre-adsorption method, which reduces the content of organic matter in dilute sulfuric acid, the removal of organic matter in this method is not complete, and it can only slightly improve the concentration process, and has not fundamentally improved the concentration process. Eliminate the clogging phenomenon, and in some schemes use ion resin adsorption, which increases the cost of treatment; another method is the pre-concentration method, which belongs to the pre-treatment category, and can only deal with dilute sulfuric acid containing low-boiling organic matter. Mixed waste acids with high or wide boiling range cannot be effectively treated
[0004] The Chinese patent with the application number 200810025334.9 discloses a dilute sulfuric acid vacuum process containing high freezing point organic matter. Organic reaction raw materials are added to the spray liquid of the washing tower to reduce the freezing point of the mixture of dilute sulfuric acid and organic matter. However, the raw material of this method is mostly formazan , Class B hazardous chemicals, which have high requirements for safety, need to increase the design level of the plant, increase the process cost, and have poor applicability to organic substances with a freezing point greater than 80°C

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  • Dilute sulfuric acid vacuum concentration system
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Embodiment 1

[0043] In this embodiment, a dilute sulfuric acid vacuum concentration system is provided, including a concentration tank, a washing tower and a spray tower connected to the gas phase outlet of the concentration tank in sequence; the washing tower is provided with a first circulation pipeline to realize the dilute sulfuric acid in the liquid phase Circulation spraying in the washing tower; the spraying tower is provided with a second circulation pipeline to realize condensation of the gas phase passing into the spraying tower from the washing tower; the second circulation pipeline is connected with the first circulation pipeline, As the supplementary water of the first circulation line, to keep the content of dilute sulfuric acid in the circulation liquid constant.

[0044] In this embodiment, the vacuum concentration system provided by the present invention adopts a double-tower structure in which the washing tower and the spray tower are separated. There is no solid phase at...

Embodiment 2

[0067] This embodiment is a further improvement made on the basis of Embodiment 1, and its difference from Embodiment 1 is:

[0068] In this embodiment, a regulating valve is provided at the connection between the second circulation pipeline and the first circulation pipeline. The water in the circulation pipeline is sent into the first circulation pipeline, or the connection between the second circulation pipeline and the first circulation pipeline is closed, so that the condensed water in the waste water tank is only used as the spray liquid of the spray tower. The second circulation pipeline is unidirectionally connected to the first circulation pipeline through the regulating valve.

[0069] Other implementation modes of this embodiment are the same as embodiment 1.

Embodiment 3

[0071] Such as figure 2 As shown, this embodiment is a further improvement made on the basis of embodiment 1, and its difference with embodiment 1 is:

[0072] The bottom of the washing tower is also provided with a gas phase equilibrium pipeline connected to the feed port of dilute sulfuric acid, the raw material of the concentration tank. When the concentration of the liquid phase dilute sulfuric acid in the washing tower rises, part of the liquid phase sulfuric acid is discharged from the washing tower system to maintain the washing process. The concentration of dilute sulfuric acid in the tower and the operating temperature of the scrubber. The discharged liquid-phase sulfuric acid is returned to the raw material dilute sulfuric acid feed port of the concentration tank to increase the output of finished acid.

[0073] Other implementation modes of this embodiment are the same as embodiment 1.

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Abstract

The invention discloses a dilute sulfuric acid vacuum concentration system, which comprises a concentration kettle, and a washing tower and a spraying tower, which are sequentially connected with thegas phase outlet of the concentration kettle, the washing tower is provided with a first circulating pipeline, so that circulating spraying of liquid-phase dilute sulfuric acid in the washing tower isrealized; the spraying tower is provided with a second circulating pipeline, so that a gas phase introduced into the spraying tower from the washing tower is condensed; and the second circulating pipeline is connected with the first circulating pipeline and is used for supplementing water to the first circulating pipeline so as to keep the content of dilute sulfuric acid in the circulating liquidconstant. In the vacuum concentration system, the operating temperature of the washing tower is higher than the melting point of organic matters contained in waste acid, so that the materials in thewashing tower only exist in a gas phase and a liquid phase, and the situation that the washing tower and a process pipeline are blocked after the organic matters with high freezing points are condensed into solids due to entrainment is avoided.

Description

technical field [0001] The invention belongs to the technical field of dilute sulfuric acid vacuum concentration, and in particular relates to a dilute sulfuric acid vacuum concentration system. Background technique [0002] In the chemical industry, it is usually necessary to use sulfuric acid as a reaction raw material or medium, but a large amount of industrial waste acid is usually produced after the reaction, which greatly increases the burden on the environment. Therefore, a variety of methods for recycling industrial waste acid have been developed in the prior art. Among them, the "vacuum concentration method" is a method that is relatively mature, safe, reliable, energy-saving, environmentally friendly and most widely used in industrial applications in dilute sulfuric acid recovery technology. However, for dilute sulfuric acid containing soluble and high freezing point organic matter, organic matter often condenses during the condensation process of the concentrated ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D1/00B01D1/30C01B17/88C01B17/90
CPCB01D1/00B01D1/30C01B17/88C01B17/905C01P2006/80
Inventor 罗芳王炳强王永康王守满王蒙吴丹丹
Owner QINGDAO DOUBLE PEACH SPECIALTY CHEM GRP