Method for processing acid gas alkali-wash waste liquor

The invention relates to a method for recycling materials in rubber antioxidant TMQ production wastewater. The method includes the steps that after the neutralized wastewater is subjected to standing layering, an extracting agent is added into a water phase containing floccules, standing layering is carried out after extracting, the water phase enters a wastewater treatment system to be unitedly treated, and an oil phase returns to a condensation polymerization kettle to be recycled. Phenylamine or TMQ synthesis monomers or TMQ synthesis fluid serves as the extracting agent; raw materials used in the TMQ product synthesis process or intermediates in the synthesis process are mainly selected and used to achieve internal recycling of the materials. According to the method, the purposes of removing pollutants and reducing consumption can be achieved just by extracting the floccules through the extracting agent after the wastewater is neutralized, the extracting recycling rate of active substances reaches 33% or above, and about 1/3 of active ingredients in the floccules are completely recycled; the TMQ yield is increased, the concentration of pollutants in the wastewater is reduced, and thus the purposes of consumption reduction, waste reduction and environment protection are achieved; treatment of the TMQ salt-containing wastewater is achieved.

Method for recycling materials in rubber antioxidant TMQ production wastewater

The invention discloses a process and device for the recycling comprehensive treatment of alkyd resin wastewater. The process comprises the steps of: extracting benzoic acid, phthalic anhydride and other raw materials from the alkyd resin wastewater into dimethylbenzene, and then distilling to concentrate the raw materials and separate the dimethylbenzene, wherein the separated dimethylbenzene isrecycled as an extracting solvent, and because the dimethylbenzene is also used as a solvent for esterification, a feed solution obtained after distillation concentration is free from further purification and can be directly reused in an alkyd resin esterification kettle. Meanwhile, the invention designs the device for the recycling comprehensive treatment of the alkyd resin wastewater according to the process. According to the device and the method, on the one hand, the wastewater is recycled and more than 95% of the benzoic acid and the phthalic anhydride in the wastewater are recovered, and on the other hand, the chemical oxide demand (COD) value of the wastewater is obviously reduced, the posttreatment difficulty is greatly reduced and the operation cost is reduced.

Process and device for recycling comprehensive treatment of alkyd resin wastewater

The invention relates to the field of washing wastewater treatment of industrial equipment, and particularly relates to a method for treating high sulfur gas field equipment washing wastewater. First, the high sulfur gas field equipment washing wastewater enters an emulsion destabilization separation system, and is heated, and the emulsion stability is damaged so as to separate oil from water; sulfur ions in the lower part of water are converted into elemental sulfur, sulfate, and sulfite that are hard to dissolve due to add of an oxidant and a divalent metal ion salt, so that the sulfur is removed; the upper part of clear liquid enters a buffer tank, is filtered through a precise filter and then is stored in a clear water tank to be used for reuse and liquid preparation of equipment washing liquid; and the lower part of precipitate enters a press filter and is filtered under pressure, then solid waste is carried away to be retreated, and press filtrate enters the buffer tank and is filtered by the precise filter and then enters the clear water tank to be used for reuse and liquid preparation of the equipment washing liquid. The method can rapidly and efficiently remove harmful substances like oil-soluble substances, sodium sulfide, and suspended matters in wastewater.

Method for treating high sulfur gas field equipment washing wastewater

A method is disclosed for use in reducing chemical oxygen demand (COD) of alkaline wastewater generated from an aldol condensation reaction during a process for preparing 2-ethylhexanol, which teaches both high-boiling-point aldol mixtures and low-boiling-point aldol mixtures are used to serve as an extractant for reducing COD in the wastewater, and further to perform a stripping treatment, thereby a removal rate of COD in the wastewater of 89-93% is then achieved.

Method for reducing chemical oxygen demand of wastewater from preparation of 2-ethylhexanol

The invention relates to a method for treating waste lye discharged by the reaction system when octanol is produced The recycled lye part discharged by an octanol production device is sent to an acidification mixer, inorganic acid and fusel are added for acidification mixture, demixing fluid is clear and separated by quiescence; extraction phase returns to a fusel tank for recycling, wastewater after neutralization is discharged to sewage farms for carrying out biological treatment; the mixing time is 3-15 minutes, the proportion by volume between the extraction agent and the wastewater is 1:1-8, the pH value after acidification is 20-45, the proportion by volume between the wastewater and 93% of concentrated sulphuric acid is 40-80:1, normal temperature and normal pressure are kept, the separated time is 30-120 minutes, the pH value of the treated water by neutralization is 6-9, the deoiling ratio is over 82%, the ratio of CODcr removal reaches 50%, biodegradability of the wastewater after treatment is improved from 40% to over 90%, the wastewater after treatment can directly enter chemical sewage farms for carrying out biological treatment, and the extraction agent does not need be regenerated

Method for treating octanol waste lye by miscellaneous alcohol acidization-extraction method

The invention relates to a pollution-free processing method of sulfur-containing waste alkaline solution. The method comprises the following steps: removing the floating oil, dispersed oil, and emulsified oil in the sulfur-containing waste alkaline solution through steps of solvent extraction, agglomeration, vortex separation, and mechanical oil removing; adding a metal sulfate desulfurizer to carry out reactions, carrying out solid-liquid separation through centrifugation, settlement, and filtration; adding a hydrogen peroxide solution into the desulfurized waste alkaline solution to carry out reactions; adding desalinated water into the reaction precipitate or filtrate cake to prepare slurry, and transporting the slurry into a pressurized reactor to carry out wet oxidation regeneration. After the wet oxidation regeneration, the obtained metal sulfate desulfurizer can be reused, the obtained desulfurized waste alkaline solution can be used to neutralize acidic wastewater, or the desulfurized waste alkaline solution can be neutralized, and then transported to a sewage processing factory to mix with other sewage to carry out bio-treatment so as to meet the discharge standards. The desulfurization is carried out at a common temperature, thus the energy consumption is reduced, moreover, the volume of the waste alkaline solution needed to be processed by the wet oxidation treatment is reduced, and the secondary pollution caused by the volatilization of organic substances during the process of direct wet oxidation treatment of sulfur-containing waste alkaline solution is avoided.

Pollution-free processing method of sulfur-containing waste alkaline solution

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Method for treating octanol waste lye by miscellaneous alcohol acidization-extraction method

Pollution-free processing method of sulfur-containing waste alkaline solution