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Cleaning and recycling process for by-product sodium sulfite of cartap

A technology of by-product sodium sulfite and sodium sulfite, applied in the preparation of alkali metal sulfite, purification of alkali metal sulfite/sulfate, heating water/sewage treatment, etc., can solve resource waste, high energy consumption, environmental pollution, etc. problem, to achieve the effect of solving pollution, high yield and low energy consumption

Inactive Publication Date: 2008-12-10
JIANGSU TIANRONG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Invention patent 98111505.5 The preparation method of cartap does not involve the recycling of sodium sulfite and wastewater treatment method
Its technology has serious deficiencies in the current promotion of circular economy and the discharge of three wastes: ① high energy consumption
The original cyanide-containing wastewater is simply concentrated in a reactor and then desalted, which requires a large amount of steam (3 tons of steam is required for each ton of product wastewater treatment)
② Waste of resources
Because the waste water cannot be biochemically treated without recovery of sodium sulfite, it can only be simply treated or discharged, causing environmental pollution

Method used

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  • Cleaning and recycling process for by-product sodium sulfite of cartap

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Collect 1000kg of cyanide-containing waste water in the production process of saquat and store it in a container with slightly positive pressure, wherein the weight content of sodium sulfite is 18%, CN - The weight content of water is 2500ppm; the water weight content is 78%. Adjust the pH value of the cyanide-containing wastewater to 11-12 with 30% aqueous sodium hydroxide solution, add it to the evaporation kiln, heat and pressurize at 85°C and 0.07Mpa for condensation, impurities CN - It is carried out with water vapor and collected by multi-stage condensation, and the recovery rate reaches 98%. The collected evaporative condensed CN-containing - The water of the cyanide is broken at a high temperature at a temperature of 110 ° C and a pressure of 0.4 MPa, so that the CN - The content decreased, and the wastewater contained CN after the cyanide was broken. - It is 2 to 5ppm and ammonia nitrogen is 200ppm. The cyanide-broken wastewater enters the wastewater treatm...

Embodiment 2

[0020] Collect the cyanide-containing waste water 1000kg and the 115kg filtrate of Example 1 in the production process of cyanide, store in the container with a little positive pressure, wherein the weight content of sodium sulfite in the cyanide-containing waste water is 18%, CN - The weight content of water is 2500ppm; the water weight content is 78%. Adjust the pH value of the cyanide-containing wastewater to 11-12 with 25% aqueous sodium hydroxide solution, add it to the evaporation kiln, and heat and condense it at 90 ° C, impurities CN - It is carried out with water vapor and collected by multi-stage condensation, and the recovery rate reaches 98%. The collected evaporative condensed CN-containing - The water of the cyanide is broken at high temperature at a temperature of 100 ° C and a pressure of 0.5 MPa, so that the CN in it - The content decreased, and the wastewater contained CN after the cyanide was broken. - It is 2 to 5ppm and ammonia nitrogen is 200ppm. The ...

Embodiment 3

[0022] Collect the cyanide-containing waste water 1000kg and the 110kg filtrate of Example 2 in the production process of cyanide, be stored in the container with a little positive pressure, wherein the weight content of sodium sulfite in the cyanide-containing waste water is 18%, CN - The weight content of water is 2500ppm; the water weight content is 78%. Adjust the pH value of the cyanide-containing wastewater to 11-12 with 35% sodium hydroxide aqueous solution, add it to the evaporation kiln, heat and pressurize at 80 ° C and 0.08 Mpa for condensation, impurities CN - It is carried out with water vapor and collected by multi-stage condensation, and the recovery rate reaches 98%. The collected evaporative condensed CN-containing - The water of the cyanide is broken at a high temperature at a temperature of 120 ° C and a pressure of 0.3 MPa, so that the CN - The content decreased, and the wastewater contained CN after the cyanide was broken. - It is 2 to 5ppm and ammonia ...

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Abstract

The invention discloses a clean recovery process of a cartap by-product sodium sulfite which comprises the steps as follows: cyanide waste water in the cartap production process is collected and adjusted; then the adjusted cyanide waste water is heated and condensed by an evaporator or condensed by heating and pressurization, the CN<-> and water obtained from the evaporation and condensation are collected, and the remaining concentrated solution is crystallized and separated to obtain sodium sulfite. The clean recovery process of a cartap by-product sodium sulfite in the invention is characterized by low energy consumption, high yield, and no pollution, meanwhile the clean production is realized, the environmental pollution caused by cyanide waste water is thoroughly eliminated and the industrial-grade sodium sulfite is obtained.

Description

technical field [0001] The invention belongs to the field of environmental protection and resource recovery, and in particular relates to a method for purifying and recovering cyanide-containing wastewater during cyanide synthesis, and further solves the problem of biochemical treatment of cyanide-containing wastewater. Background technique [0002] Nere poison derivative insecticide is a kind of high-efficiency, low-toxicity, broad-spectrum biomimetic insecticide, and fentan is the most widely used, more efficient, and more broad-spectrum variety in this series of products. It was invented and commercialized by Takeda in Japan. Since the 1960s and 1970s, many research institutes in China have started research and development, but no breakthrough has been achieved. It was not until the end of the last century that the synthesis process was basically determined. After nearly ten years of continuous optimization, it has now reached the international level. Judging from the cu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/14C01D5/16C02F1/04C02F103/34
Inventor 许网保魏明阳周国平王良虞国新毛建新
Owner JIANGSU TIANRONG GROUP
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