4 results about "Chlorinated phenols" patented technology

The invention discloses a desorption regeneration method of chlorinated phenol adsorption resin, which comprises the following steps: adsorbing 2, 4-dichlorophenol by using macroporous adsorption resin to obtain a byproduct 5-crude hydrochloric acid, then respectively carrying out desorption regeneration by using a first regenerant and a second regenerant, washing the obtained resin with water, and recycling to adsorb impurities in the crude hydrochloric acid. And the first regenerant and the second regenerant can be uniformly collected, separated and recycled. According to the method, methylbenzene and alcohol substances are respectively used as regenerant, efficient desorption and regeneration of the macroporous adsorption resin containing impurities such as chlorophenol are realized, and the method is simple, low in cost and capable of meeting environmental protection requirements.

The invention provides a polymethyl methacrylate and polyethylene glycol blended asymmetric nanofiltration membrane and application, and the polymethyl methacrylate and polyethylene glycol blended asymmetric nanofiltration membrane is prepared by the following steps: stirring and dissolving two polymers, namely polymethyl methacrylate (PMMA) and polyethylene glycol (PEG), in an N, N-dimethylformamide solvent to form a membrane casting solution; the preparation method comprises the following steps: preparing a nanofiltration membrane with a specific thickness through a membrane scraper, then placing the prepared nanofiltration membrane in a fuming cupboard for standing, forming a blended asymmetric nanofiltration membrane with a compact structure based on different volatilization speeds of a solvent on the upper layer and at the bottom of the nanofiltration membrane, completely immersing the blended asymmetric nanofiltration membrane in deionized water, removing the solvent through a phase transfer method, and drying to obtain the asymmetric nanofiltration membrane. Further curing the film; in the membrane preparation process, polymethyl methacrylate is used as a main supporting material, polyethylene glycol is used as a pore-foaming agent and a hydrophilic material, and the membrane realizes efficient separation and removal of neutral chlorinated phenol disinfection byproducts with the molecular weight of less than or equal to 200 in water.

The preparation method specifically comprises the following steps: calcining MCM-41 at a high temperature through a direct carbonization method to obtain a Si-rich doped carbon precursor, and regulating the relationship between the specific surface area and a pore structure by adopting a NaOH activation method to obtain the immobilized laccase preparation. An immobilized carrier material with a large specific surface area and a complex pore structure is obtained through dopamine auto-polymerization-crosslinking surface functionalization, and the immobilized laccase preparation is obtained through the combined action of physical adsorption of the carrier material and laccase and chemical crosslinking of glutaraldehyde. The prepared immobilized laccase preparation is used for efficiently catalyzing and degrading phenol, polyphenol, chlorinated phenol, polyamine, dye, aromatic substrates and part of inorganic compounds in polluted sites and underground water. According to the method, the laccase immobilization rate is increased, the reaction conditions are mild, the preparation process is simple, and industrialization is easy.

The application discloses a method for synthesizing chlorinated phenol by catalytic chlorination, which comprises the following steps: reacting phenol with mixed gas of chlorine and air in water in the presence of a catalyst to obtain a chlorination reaction liquid, and then performing liquid separation and distillation dehydration on the chlorination reaction liquid to obtain a chlorinated phenol product. The method uses phenol as a raw material, and the reaction of the phenol with the mixed gas of chlorine and air in the presence of the catalyst can obviously improve the reaction rate while obtaining a higher reaction selectivity. After the improvement, pure oxygen and concentrated hydrochloric acid are no longer used, and a large amount of phenol-containing hydrochloric acid by-product is no longer generated, and the product quality and the product yield are greatly improved, and the method is more suitable for industrial large-scale production.