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Method for purifying and regenerating copper element in quinolinic acid production wastewater to prepare quinolinic acid copper salt

A technology for oxidizing wastewater and copper quinolinate, applied in organic chemistry and other fields, can solve problems such as discharge and water pollution, and achieve the effect of solving discharge and improving utilization rate

Active Publication Date: 2019-08-09
FUJIAN TAIFENG PHARMA & CHEM CO LTD
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Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of method that copper element purification regeneration prepares quinolinic acid copper salt in quinolinic acid oxidation waste water, to solve the discharge of quinolinic acid oxidation waste water, cause copper element to pollute the actual technical problem of water body

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  • Method for purifying and regenerating copper element in quinolinic acid production wastewater to prepare quinolinic acid copper salt

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Embodiment 1

[0024] Pump the collected wastewater with a volume of 4 cubic meters into a 6000L reaction kettle, adjust the pH to 6.8-7.2 with 30% sodium hydroxide liquid alkali, add sodium sulfide in batches, take samples and filter from time to time, measure the pH value to 10, and the filtrate Use 1% silver nitrate reagent to check whether there is excess sulfide ion, silver sulfide Ksp1.09×10 -49 , stop adding sodium sulfide until there is black precipitate, react for 15 minutes, check again for black precipitate, and press filter to obtain copper sulfide, dry and store for future use or store the wet product for future use after measuring the moisture content.

[0025] Put 900kg of measured water, 7kg of recovered copper sulfide (dry basis) and 12.5kg of sodium chlorate into the zinc oxide according to the original process, heat up to 50°C and react for 2 hours, add 244kg of 80% sulfuric acid measured by the process 1. 1 kg of copper sulfate pentahydrate, 88 kg of copper hydroxide (dry...

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Abstract

The invention discloses a method for purifying and regenerating a copper element in quinolinic acid production wastewater to prepare quinolinic acid copper salt and belongs to the technical field of quinolinic acid production wastewater treatment. The method comprises the following steps: (1) regulating the pH value of wastewater by using alkali, then slowly adding sodium sulfide while stirring, detecting the value by using a pH reagent, and carrying out filter pressing to collect black CuS precipitate; (2) adding the recycled CuS and water into an oxidation reaction kettle, and then executingstirring and adding a sodium chlorate water solution for oxidation reaction; (3) adding copper sulfate pentahydrate, recycled copper hydroxide, quinoline and sulfuric acid into the oxidation reactionkettle, dropwise adding the sodium chlorate water solution, heating the reaction kettle, carrying out heat preservation reaction, then executing cooling after heat preservation, executing crystallizing to separate out solid, and executing filtration to obtain a quinolinic acid copper salt. According to the method, the copper in the wastewater is reduced to below 2ppm, the utilization rate of thecopper is improved, the waste can also be changed into wealth, and the discharge problem of high-copper ion wastewater is solved.

Description

technical field [0001] The invention belongs to the technical field of quinolinic acid oxidation wastewater treatment, and in particular relates to a method for preparing quinolinic acid copper salt by purifying and regenerating copper elements in quinolinic acid oxidation wastewater. Background technique [0002] The production process of quinolinic acid is as follows: add copper sulfate pentahydrate, copper hydroxide (regenerated paste) and water into the reaction kettle, then slowly add concentrated sulfuric acid, raise the temperature to 55°C, keep stirring for 1h; add quinolinic acid Then slowly add sodium chlorate aqueous solution dropwise, and the reaction kettle starts to heat up. When the temperature of the reaction kettle rises to 90-95°C, keep the heat for 22 hours. A solid precipitated out. Then filter to obtain quinolinic acid copper salt and waste water; the quinolinic acid copper salt is neutralized with alkali to obtain quinolinic acid sodium salt, and at th...

Claims

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Application Information

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IPC IPC(8): C07D213/80C07D213/803C22B15/00C22B7/00
CPCC07D213/80C07D213/803C22B7/00C22B15/00
Inventor 史小鸣杨鹏
Owner FUJIAN TAIFENG PHARMA & CHEM CO LTD
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