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A kind of treatment method of waste gas waste water in the production process of trichloroisocyanuric acid

A technology of trichloroisocyanuric acid and production process, applied in carbonate preparations, calcium/strontium/barium chloride, calcium/strontium/barium halide, etc., can solve the problem of environmental pollution of production waste gas and wastewater and comprehensive utilization of resources, etc. problem, to achieve the effect of clean production process, easy reaction and reduced evaporation cost

Active Publication Date: 2016-06-08
山东大明消毒科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a method for the treatment of waste gas and waste water in the process of producing trichloroisocyanuric acid from chlorine gas leading to cyanuric acid, calcium carbonate and water prepared calcium cyanurate solution, to solve the problems of production waste gas waste water polluting the environment and comprehensive utilization of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Step A: The waste liquid after centrifugation and dehydration of trichloroisocyanuric acid is pumped into the static mixer for acidification through the flow meter at a speed of 15000kg / h and 30% hydrochloric acid 80~100kg / h from the hydrochloric acid head tank at the same time, so that it can be mixed The pH value of the liquid is maintained at 1.2~1.3. The acidified solution in the static mixer enters from the upper part of the dechlorination tower at normal temperature, and the compressed air is sent from the bottom of the dechlorination tower at 1000m3 / h. The top of the chlorine tower is discharged and passed into the chlorination reaction kettle, the reaction liquid is suction filtered, and the obtained cyanuric acid filter cake is returned to production to continue to be used as raw materials for production, and the filtrate is collected and then pumped into the neutralization reactor.

[0044] Step B: Add about 15,000 kg of acidified dechlorinated mother liquor in...

Embodiment 2

[0047] Step A: The waste liquid after centrifugation and dehydration of trichloroisocyanuric acid is pumped into the static mixer for acidification through the flow meter at a speed of 15000kg / h and 30% hydrochloric acid 80~100kg / h from the hydrochloric acid head tank at the same time, so that it can be mixed The pH value of the liquid is maintained at 1.50. The acidified solution in the static mixer enters from the upper part of the dechlorination tower at normal temperature, and the compressed air is sent from the bottom of the dechlorination tower at 1000m3 / h. The compressed air sends the chlorine gas generated by the reaction from the dechlorination tower The top is discharged and passed into the chlorination reactor, and the reaction liquid is suction-filtered, and the obtained cyanuric acid filter cake is returned to production to continue to be used as a production raw material, and the filtrate is collected and then pumped into the neutralization reactor.

[0048] Step ...

Embodiment 3

[0051] Step A: The waste liquid after centrifugation and dehydration of trichloroisocyanuric acid is pumped into the static mixer for acidification through the flow meter at a speed of 15000kg / h and 30% hydrochloric acid 80~100kg / h from the hydrochloric acid head tank at the same time, so that it can be mixed The pH value of the liquid is maintained at 1.90~2.00. The acidified solution in the static mixer enters from the upper part of the dechlorination tower at normal temperature, and the compressed air is sent from the bottom of the dechlorination tower at 1000m3 / h. The top of the chlorine tower is discharged and passed into the chlorination reaction kettle, the reaction liquid is suction filtered, and the obtained cyanuric acid filter cake is returned to production to continue to be used as raw materials for production, and the filtrate is collected and then pumped into the neutralization reactor.

[0052] Step B: Add about 15,000 kg of the mother liquor after acidification ...

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Abstract

The invention discloses a method for treating a waste gas and wastewater in the trichloroisocyanuric acid production process. The method comprises the following steps of carrying out dechlorination reaction by using hydrochloric acid to generate cyanuric acid and chlorine, wherein cyanuric acid is fed back to production; thoroughly absorbing chlorine gas by using a calcium cyanurate solution, and absorbing residual carbon dioxide gas with an alkali solution to generate baking soda; and adding lime slurry in the excessive hydrochloric acid solution in the reaction to generate calcium chloride which is mixed with calcium chloride in the original wastewater so as to produce anhydrous calcium chloride. The method has the advantages that treatment on the waste gas and the wastewater of trichloroisocyanuric acid is achieved, not only is the environment pollution caused by the waste gas and the wastewater prevented, but also production benefits are made, the treatment process is simple, the reaction is easy to control and achieve, no secondary pollution is caused, the problem of discharging the wastewater and the waste gas in the process of producing trichloroisocyanuric acid from a cyanuric acid calcium solution which is prepared by introducing chlorine into cyanuric acid, calcium carbonate and water is solved, and an environmental-friendly production process of the trichloroisocyanuric acid without wastewater or waste gas is achieved.

Description

technical field [0001] The invention relates to the technical field of a method for treating waste gas and wastewater in organic chemical production, in particular to a method for treating waste gas and wastewater in the production process of trichloroisocyanuric acid. technical background [0002] At present, the production method of trichloroisocyanuric acid mainly adopts the liquid caustic method, that is, cyanuric acid and liquid caustic soda generate trisodium cyanurate, and then feeds chlorine gas to generate trichloroisocyanuric acid. However, during the production process of this method, there will be A large amount of wastewater contains a large amount of sodium chloride and trichloroisocyanuric acid, of which the recovery value of sodium chloride is low, and trichloroisocyanuric acid compounds are heterocyclic compounds containing triazine ring structures, which are difficult to degrade and treat. Only the mother liquor is diluted and discharged, which not only pol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D251/32C01F11/28C01D7/07
CPCC01D7/07C01F11/28C07D251/32
Inventor 邵长银李成顺刘尚玉程明峰郑文莉
Owner 山东大明消毒科技有限公司
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