Treatment method for acid pickling water and neutralized waste water in tetrabromobisphenol A producing process
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A tetrabromobisphenol and treatment method technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of limitation, incomplete oxidation, easy carbon deposition, etc. Achieve the effects of improving water production efficiency, realizing salt recycling, and reducing toxicity
Inactive Publication Date: 2014-12-10
天津长芦汉沽盐场有限责任公司
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Problems solved by technology
Therefore, the current treatment of pickling water and neutralization wastewater cannot meet the standards.
[0013] In the prior art, methods for treating tetrabromobisphenol A wastewater also include catalytic oxidation, photochemical oxidation, electrochemical oxidation, ultrasonic chemical oxidation, absorption, stripping, and biological treatment, all of which have deficiencies. , are subject to varying degrees of limitations in practical applications
Advanced chemical oxidation treatment of chlorobenzene-containing organic wastewater has the characteristics of strong oxidation ability, high removal efficiency, and fast oxidation speed, but it has disadvantages such as harsh reaction conditions, high equipment investment, and high operating costs, making it difficult to scale and industrialize applications; catalytic oxidation
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[0031] Example 1: Neutralization wastewater treatment
[0032] The pH of the neutralized wastewater was adjusted to 1.5 with sulfuric acid to generate tribromophenol precipitation. After adding polyacrylamide flocculant, the tribromophenol was separated by a centrifuge. The separated clear liquid was heated to 60°C and flashed at -0.09MPa Evaporate and flash out 10% condensate, and the residual liquid will be steam heated to concentrate and crystallize, and the crystalline solid is recovered.
[0033] According to the above experimental parameters, the experimental conditions are shown in Table 2.
[0034] Table 2: Water quality of neutralization wastewater treatment
[0035]
[0036] From the experimental results in Table 2, it can be seen that the concentration of chlorobenzene in the flashed 10% condensate is 436.4~510.4mg / L, the salinity is 0, and the 10% condensate can be recycled; the concentration of chlorobenzene in the condensate is 0 ~0.8mg / L, the salinity is 0, the condens...
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[0037] Example 2: Treatment of pickling wastewater
[0038] The pickling wastewater directly enters the flash evaporation device, flashes at 80°C and -0.09MPa, flashes 10% condensate, the residual liquid vapor is heated to concentrate and crystallize, and the crystalline solid is recovered. According to the above experimental parameters, the experimental conditions are shown in Table 3.
[0039] Table 3: Water quality of pickling wastewater treatment
[0040]
[0041] From the experimental results in Table 3, it can be seen that the concentration of chlorobenzene in the flashed 10% condensate is 37.16-105.5mg / L, the salinity is 0, and the 10% condensate is recycled; the concentration of chlorobenzene in the condensate is 0.34~ 0.48mg / L, the salinity is 0.05~0.13mg / L,
[0042] The condensate can also be recycled.
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Abstract
The invention relates to a treatment method for acid pickling water and neutralized waste water in the tetrabromobisphenol A producing process. The existing problems of the enterprise are solved. After the waste water is treated, the resource comprehensive utilization of the waste water is realized, chlorobenzene is reclaimed, and the waste water meets the emission requirements of environment protection burea. The treatment method comprises the following steps: adding acid into the neutralized waste water, regulating the pH to 1-2, precipitating out tribromophenol, and then adding a polyacrylamide flocculant; filling the neutralized waste water treated by the flocculant into a centrifuge, separating by the centrifuge, mixing clear liquid and the acid pickling waste water, and separating out and reclaiming tribromophenol precipitates; entering a flash evaporation procedure after mixing the clear liquid separated in a centrifugal way with the acid pickling waste water, carrying out flash evaporation at a temperature of 60-80 DEG C under the pressure of subzero 0.09 MPa, realizing the azeotropy of the chlorobenzene and the water, evaporating the chlorobenzene with water steam, condensing, enabling the evaporated chlorobenzene to enter condensate, and reclaiming the chlorobenzene with the condensate; controlling the temperature of the waste water at 60-80 DEG C after flash evaporation, feeding in an MVR (Mechanical Vapor Recompression) system, reclaiming the condensate, and reutilizing crystallized solid salt.
Description
technical field [0001] The invention belongs to a method for treating chemical waste water, in particular to a method for treating pickling water and neutralized waste water in the process of producing tetrabromobisphenol A. Background technique [0002] Tetrabromobisphenol A (TBA) is a new type of flame retardant, which is widely used in plastics, rubber, textile, fiber and papermaking industries, and has broad application prospects. In the production process of tetrabromobisphenol A, a large amount of high-concentration organic wastewater is produced, which are pickling wastewater, neutralization water, first-wash wastewater, second-wash wastewater, and third-wash wastewater. These wastewaters contain a large amount of toxic and non-biodegradable chlorobenzene, bisphenol A and other organic substances, which pose a threat to human health and the environment. Wastewater is typical chemical wastewater, mainly containing chlorobenzene, a large amount of sodium sulfate, sodiu...
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