37results about How to "Reduce phenol content" patented technology

The invention discloses a preparation method of alkali lignin modified sulfamate highly effective water reducing agent, which includes the steps that: firstly, alkali lignin, phenol and water are evenly mixed, and an alkaline regulator is used to adjust the pH value of a reaction system to 8.0-10.0 and heat the temperature to 80-100 DEG C for half an hour to two hours; secondly, the pH value is adjusted to 9.0-11.0, and aminobenzene sulfonic acid sodium is added to react under the temperature of 60 to 80 degrees for half an hour to one hour; thirdly, the temperature is heated to 75-95 DEG C, and condensing agent is dropped. After that, the reaction continues for three to six hours and then the temperature is lowered. The obtained water reducing preparation, having low cost and small content of free formaldehyde and phenol, can improve the fluidity of concrete and compressive strength significantly. The preparation method is a simple technique without the discharge of three wastes in production.

The invention discloses condensation mother liquid waste water pretreatment and a resource system and a method in a compound neutralization reactor in a disperse blue 56 production process, which belongs to the waste water treatment field. The method comprises the following steps: highly basic condensation mother liquid waste water in the disperse blue 56 production process and a mixed acid solution (sulfuric acid and sulfamic acid) in the compound neutralization reactor are neutralized, three purposes of reducing the pH value of waste water, precipitating phenol and removing nitrite can be simultaneously realized; the neutralized waste water passes through a fixed bed adsorption column filled with adsorption resin, so that residual phenol in the waste water can absorb on the resin column. Resin after adsorption saturation is carried out with desorption and regeneration by using a NaOH solution and then the resin is repeatedly usable, and the desorption liquid passes through the processes of acidity adjusting and vacuum distillation of phenol to realize recycling of phenol. According to the condensation mother liquid waste water which is pretreated in the disperse blue 56 production process, CODCr value is decreased from about 55000mg/L to less than 500mg/L, the phenols substance concentration is decreased from about 19000mg/L to less than 20mg/L, the nitrite ion is decreased from 87000mg/L to less than 20mg/L; thereby the treatment and resource utilization of waste water can be effectively realized.

The invention relates to a compound additive for reducing the release amount of phenol in flue gas and a preparation method and application thereof. The compound additive comprises, by weight, 1-20 parts of polymers, 0.1-5 parts of acid compounds, 0.1-5 parts of polyol and 20-50 parts of solvents; and the polymers are one or more of polyvinyl pyrrolidone and vinyl pyrrolidone-maleic acid copolymers with the molecular weight of 1,000 to 1,000,000. Suitable ligands are selected to be mixed with PVP, the amount of phenol in the flue gas is quickly and selectively reduced, the effect is obvious, the smoke flavor of cigarettes is not obviously affected, and the irritation is relieved. The preparation method is simple, the cost is low, and the harm reduction effect is obvious.

The invention discloses modified activated carbon for adsorbing phenol as well as a preparation method and an application of the modified activated carbon. The preparation method of the modified activated carbon for adsorbing phenol comprises the following steps: firstly, oxidizing activated carbon by adopting an oxidizing agent to obtain oxidized activated carbon; secondly, dipping the obtained oxidized activated carbon into an aqueous solution containing nitrogen-containing small molecules to obtain activated carbon adsorbed with the nitrogen-containing small molecules; and thirdly, carryingout microwave irradiation treatment on the obtained activated carbon adsorbed with the nitrogen-containing small molecules to obtain the modified activated carbon for adsorbing phenol. The surface ofthe prepared activated carbon has stable nitrogen-containing functional groups such as pyridine, pyrrole and amino, the pore structure and the specific surface area of the activated carbon are not greatly changed, the mass transfer process of phenol in the activated carbon particles is not influenced, and the adsorption capacity of the activated carbon to phenol can be effectively improved. Meanwhile, when the prepared modified activated carbon for adsorbing phenol is applied to a cigarette rate filter tip, the content of phenol in cigarette smoke is remarkably reduced, and no adverse effectis caused to cigarette aroma and smoking taste.

The present invention relates to a composite material for reducing phenol emission from flue gas and a preparation method and application thereof. The preparation method comprises the following stepsof (1), preparation of polymer solution, (2), preparation of surfactant solution and (3), preparation of composite materials. The composite material for reducing phenol emission from flue gas is combined with PVP and activated carbon, the contact area between the PVP and the flue gas is effectively improved, the adsorption efficiency and capacity of phenol in the flue gas by the composite materialfor reducing phenol emission from flue gas are improved. The phenol content in the flue gas is quickly and selectively reduced, and the phenol content in the flue gas can be obviously reduced, and obvious influence on the smoking of cigarettes is not produced, and at the same time the irritation is improved. Besides, the composite material for reducing phenol emission from flue gas is simple in preparation and low in cost.

The invention belongs to the field of waste gas treatment and particularly relates to a method for reducing the content of phenol in waste gas. The method for reducing the content of phenol in the waste gas comprises a step of treating the waste gas by using an absorbent, and the absorbent is quaternary ammonium salt or a eutecticevaporate solvent containing the quaternary ammonium salt; the quaternary ammonium salt is selected from choline chloride and has a structure shown as a formula (1); in the formula (1), R1, R2, R3 and R4 are independently selected from C1-4 alkyl groups; and the eutecticevaporate solvent containing the quaternary ammonium salt is composed of a hydrogen bond acceptor and a hydrogen bond donor, the hydrogen bond acceptor is the quaternary ammonium salt, and the hydrogen bond donor is selected from one of glycerin, 1, 2-propylene glycol, citric acid, malic acid and levulinic acid. According to the method for reducing the phenol content in the waste gas, the quaternary ammonium salt or the eutecticevaporate solvent containing the quaternary ammonium salt is used as the adsorbent for treating the waste gas, the content of phenol in the waste gas can be effectively reduced, and emission poison of the phenol-containing waste gas is reduced.

The invention provides a method for reducing the content of phenol in water through unburnt carbon in solid waste fly ash. The method includes the steps of fly ash flotation, unburnt carbon stirring and adsorption, centrifugal solid and liquid separation, detection and the like. Industrial solid waste fly ash is subjected to flotation to obtain the foam product, namely unburnt carbon; the unburnt carbon is added into sewage containing phenol to be adsorbed, solid and liquid separation is conducted by means of a centrifugal machine after adsorption is finished, and supernate is purified water obtained after treatment; the unburnt carbon removal rate of unburnt carbon in water is calculated. Fine granularity, large specific surface area and a rich porous structure of unburnt carbon are used for adsorbing and removing phenol in water, accordingly the content of phenol in water is reduced, and the effect of reducing waste by means of waste is achieved.

The invention discloses a synthesis method of fluorene-9-bisphenol, in particular to a green synthesis method of 9, 9-bis (4-hydroxy) fluorine. The method comprises the steps of enabling phenol and 9-fluorenone to react in an organic solvent in a concentrated sulfuric acid acidic medium condition under the catalysis of 3-thiohydracrylic acid, wherein the mole ratio of the phenol to the concentrated sulfuric acid to the 3-thiohydracrylic acid to the 9-fluorenone is (2-8): (0.1-0.6): (0.01-0.1): 1, the reaction temperature is -5 to 80 DEG C, and the reaction time is 2-8h; after the completion of the reaction, cooling to room temperature, filtrating, and washing a filter cake with the organic solvent; combining filtrate, and then adding the 9-fluorenone, the phenol, the concentrated sulfuric acid and the 3-thiohydracrylic acid into the filtrate sequentially to carry out circular reaction. In the synthesis process, since the organic solvent is used, the dosage of the phenol can be greatly reduced, the excessive phenol can be directly recycled through the filtrate, the efficiency of the system can be improved, and the discharge of acidic wastewater and the phenol can be reduced; meanwhile, the fluorene-9-bisphenol can be synthesized with high yield and high selectivity.

The invention provides a method for treating desalted water generated in a MDA preparation process. According to the method, before catalytic oxidation treatment, a phenol content is controlled not toexceed 0.8 mg/L and/or a sodium bromide content is controlled not to exceed 0.2 mg/L. According to the treatment method provided by the invention, the impurity components of the desalted water are deeply analyzed, the phenol content and the sodium bromide content in the desalted water are effectively controlled, deep purification effect can be achieved, the TOC content and the bromophenol contentin the treated desalted water are relatively low, organic matters are thoroughly removed, and environmental pressure is reduced; and the treatment method provided by the invention is strong in pertinence, simple and convenient in process, convenient for industrial implementation and stable in operation, does not need a large amount of manpower and equipment investment, and has a very good application prospect.

The invention discloses a cigarette filter additive capable of lowering phenol content in mainstream smoke and a preparation method and application of the cigarette filter additive. The cigarette filter additive is a composite formed by loading curcumin formaldehyde resin on a solid carrier. The preparation method includes dispersing the curcumin formaldehyde resin in water and adding in the carrier for soaking prior to filtering and drying to obtain the cigarette filter additive. The cigarette filter additive is good in chemical stability and safe to human bodies, the phenol content in the mainstream smoke can be lowered effectively by adding the cigarette filter additive to a cigarette filter; in addition, the preparation process and operation of the cigarette filter additive are simplified, and industrial production is satisfied.