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Waste gas treatment method and waste gas treatment equipment in sodium hydrosulfite production

A technology for waste gas treatment and hydrosulfite, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles, can solve the problems of insufficient purification degree, low purification efficiency, and inability to effectively handle toxic substances, so as to improve efficiency and reduce pollution. Concentration, the effect of strong redox ability

Active Publication Date: 2016-12-07
茂名市广地化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the waste gas treatment methods in the production of hydrosulfite mainly use sodium hydroxide liquid absorption and oxidant oxidation, but such purification efforts are still unable to effectively treat toxic substances that are difficult to decompose, and there are still problems of insufficient purification degree and low purification efficiency. question

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  • Waste gas treatment method and waste gas treatment equipment in sodium hydrosulfite production

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Embodiment 1

[0043] A kind of waste gas processing method in the production of sodium hydrosulfite of the present embodiment, comprises the following steps:

[0044] Step 1, preprocessing:

[0045] (1) Methanol absorption: Pass the exhaust gas through a -50°C methanol solution to absorb sulfides, aldehydes, and ethylene oxide in the exhaust gas;

[0046] (2) Condensation: Use -60°C condensate to condense the gas in (1) to remove condensed substances, where the condensate is sulfur dioxide-methanol condensate;

[0047] (3) Alkali washing: wash the gas in (3) with lye to further remove sulfides, aldehydes, ethylene oxide, acidic substances and water-soluble substances in the gas to obtain pretreated gas;

[0048]Step 2, lye spray: introduce the gas obtained in step 1 into the purification alkali washing tower, and under the spray absorption of 2% sodium hydroxide solution, remove the gas soluble in water and neutralize the gas in the gas Acid gas, the gas whose concentration of toxic gas i...

Embodiment 2

[0054] A kind of waste gas processing method in the production of sodium hydrosulfite of the present embodiment, comprises the following steps:

[0055] Step 1, preprocessing:

[0056] (1) Methanol absorption: Pass the exhaust gas through a methanol solution at 10°C to absorb sulfides, aldehydes, and ethylene oxide in the exhaust gas;

[0057] (2) Condensation: Use -30°C condensate to condense the gas in (1) to remove the condensed substance, where the condensate is sulfur dioxide-methanol condensate;

[0058] (3) Alkali washing: wash the gas in (3) with lye to further remove sulfides, aldehydes, and ethylene oxide in the gas to obtain pretreated gas;

[0059] Step 2, lye spray: the gas obtained in step 1 is introduced into the purification alkali washing tower, and under the spray absorption of sodium carbonate solution, the gas soluble in water and the acid gas in the gas are removed to obtain The gas whose concentration of toxic gas drops, in addition, it is necessary to ...

Embodiment 3

[0065] A kind of waste gas processing method in the production of sodium hydrosulfite of the present embodiment, comprises the following steps:

[0066] Step 1, preprocessing:

[0067] (1) Methanol absorption: Pass the exhaust gas through a methanol solution at -20°C to absorb sulfides, aldehydes, and ethylene oxide in the exhaust gas;

[0068] (2) Condensation: Use 0°C condensate to condense the gas in (1) to remove condensed substances, where the condensate is sulfur dioxide-methanol condensate;

[0069] (3) Alkali washing: wash the gas in (3) with lye to further remove sulfides, aldehydes, and ethylene oxide in the gas to obtain pretreated gas;

[0070] Step 2, lye spray: introduce the gas obtained in step 1 into the purification alkali washing tower, and under the spray absorption of 2% sodium hydroxide solution, remove the gas soluble in water and neutralize the gas in the gas Acid gas, the gas whose concentration of toxic gas is reduced, in addition, it is necessary to...

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Abstract

The invention relates to the technical field of waste gas treatment, in particular to a waste gas treatment method and waste gas treatment equipment in sodium hydrosulfite production. The waste gas treatment method includes the steps of (1), pretreatment, (2) alkali liquor spraying, (3) photooxidation ion oxidation catalysis, (4) oxidation spray, and (5) adsorption. Through the waste gas treatment method, toxic substances difficult to decompose can be decomposed effectively, and efficiency of waste gas purification treatment is increased. The waste gas treatment equipment comprises a pretreatment device, a purification alkaline washing tower connected with the pretreatment device, a photooxidation ion oxidation catalysis reactor connected with the purification alkaline washing tower, an oxidation tower connected with the photooxidation ion oxidation catalysis reactor and a JS strong adsorption tower connected with the oxidation tower, and waste gas is treated via the pretreatment device, the purification alkaline washing tower, the photooxidation ion oxidation catalysis reactor, the oxidation tower and the JS strong adsorption tower in sequence. The equipment is high in automation level, easy to operate and low in production cost.

Description

technical field [0001] The invention relates to the technical field of waste gas treatment, in particular to a waste gas treatment method and waste gas treatment equipment in the production of sodium hydrosulfite. Background technique [0002] Sodium dithionite (Na 2 S 2 o 4 ), is a commonly used chemical reducing agent, which is often used in vat dyeing, reduction cleaning, printing, decolorization and bleaching of silk, wool and nylon fabrics in the textile industry. The waste gas in the production of hydrosulfite mainly comes from the tail gas in the synthesis process, the pressing gas in the drying process, and the non-condensable gas in the vacuum process. The above waste gas contains high concentrations of corrosive and toxic sulfides, VOC organic and inorganic substances. If the waste gas is directly discharged into the atmosphere, it will not only have an irritating stench, but also cause serious impact on the environment. So as to damage the living environment...

Claims

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Application Information

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IPC IPC(8): B01D53/75B01D53/78B01D53/86B01D53/74
CPCB01D53/74B01D53/75B01D53/78B01D53/86
Inventor 梁汉国
Owner 茂名市广地化工有限公司
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