101 results about "Hexachlorobenzene" patented technology

A method for recovering much of the carbon and chlorine value in the heavy ends and other undesired by-products formed during the production of a C3 or higher polychlorinated alkane through the reaction of carbon tetrachloride with an olefine or chlorinated olefine, the improvement comprising the step of first separating the heavy ends and any other higher or lower boiling chlorohydrocarbon impurities from most of the desired product, and subjecting the separated heavy ends and impurities therewith to a high temperature exhaustive chlorination to produce carbon tetrachloride, tetrachloroethene, and minor amounts of hexachlorobutadiene and hexachlorobenzene by-products.

The invention discloses a preparation method for green slow-release-type nanometer zero-valent iron particles. The nanometer zero-valent iron particles serve as the core of a material, and the surface of the nanometer zero-valent iron particles is wrapped with polyaspartic acid (PASP). A reduction method is adopted, in a PASP aqueous solution, KBH4 or NaBH4 or other reducing agents are used for reducing Fe2+ to obtain Fe0. The preparation method is simple and free of secondary pollution. The obtained nanometer zero-valent iron particles have better dispersity and reactivity, and are higher than common iron powder by more than 174% and 148% respectively on the aspect of the effects of removing Cr6+ and hexachlorobenzene. The nanometer zero-valent iron particles have good stability in air, can be stored for a longer time, have good slow-release performance and can effectively control pollutants for a long time. Compared with common nanometer zero-valent iron, the action duration time can be improved by more than 40%, and the slow-release-type nanometer zero-valent iron particles have good market potentials.

The invention discloses a solid pesticide identification method based on terahertz spectroscopy. The method comprises the following steps: (1) detecting a solid pesticide standard sample with the purity of greater than 99 percent by using a terahertz time-domain spectroscopy system, acquiring a terahertz time-domain signal of each sample, and calculating an absorption spectrum of each sample, wherein the solid pesticides refer to hexachlorobenzene, diphenylsulfon, phosmet and dipterex; (2) normalizing the absorption spectrum of each sample, wherein the influence on noise and drift is eliminated, and the absorption spectrum is used for spectral classification of each sample; and (3) identifying the terahertz absorption spectrum of each sample by utilizing a C-support vector machine (C-SVM). The method disclosed by the invention can realize rapid and nondestructive detection of pesticides and has the advantages of simple pretreatment of experimental samples, simplicity in operation, high repeatability, data processing simplicity, accurate detection result and the like.

The present invention discloses a production method of chlorothalonil with low hexachlorobenzene content. Said production method includes the following steps: firstly, vapourizing m-dicyanobenzene, using nitrogen gas to carry out the vapourized m-dicyanobenzene from the vapourizer, making the vapourized m-dicyanobenzene be mixed with chlorine gas, and making them be fed into fluidized bed to make first-step reaction, making the reaction product be further mixed with chlorine gas and feeding them into fixed bed to make chlorination, condensing and collecting the outputted mixed gas so as to oblain the invented chlorothalonil product.

The invention discloses a computer coolant which is prepared from the following raw materials: 50-55 parts of glycerol, 40-45 parts of methanol, 32-35 parts of ethanol, 10-15 parts of phosphoric acid, 3-5 parts of aether, 2-3 parts of acetic acid, 3-4 parts of acetone, 3-4 parts of salicylic acid, 1-3 parts of oleic acid, 2-4 parts of n-octanoic acid, 3-5 parts of heptylic acid, 1-2 parts of isopelargonic acid, 3-4 parts of glycollic acid, 3-4 parts of phenol, 2-5 parts of benzoic acid, 3-4 parts of m-phthalic acid, 3-5 parts of trimethylolpropane, 2-5 parts of benzimidazole, 1-2 parts of hexachlorobenzene, 2-3 parts of polyether defoamer, 8-10 parts of silicon oil and 180-220 parts of deionized water. The computer coolant has the advantages of environmental protection, high safety and high cost performance, can effectively protect the metal materials of the computer cooling system, has higher compatibility for rubber and other sealing elements, prevents the dirt from generation, enhances the heat transfer capability of the cooling system, can prevent the computer cooling system from corrosion, avoids leakage, is harmless and pollution-free, and ensures the safe operation of the computer system.

The invention provides a separation system for by-product high-boiling matter in tetrachloroethylene production and a separation method. The system comprises a decompression sublimation device, a desublimation device, a first rectifying tower, a hexachloroethane separation system and a hexachlorobenzene separation system, wherein a gas material outlet of the decompression sublimation device is connected with a feeding port of the desublimation device, a light-component material outlet of the desublimation device is connected with a feeding port of the first rectifying tower, a heavy-componentmaterial outlet of the desublimation device is connected with a feeding port of the hexachloroethane separation system, and a solid material outlet of the decompression sublimation device is connectedwith the hexachlorobenzene separation system. According to the method, the byproduct high-boiling matter in the tetrachloroethylene production is separated and purified one by one through processes such as decompression sublimation, washing by using a solvent, recrystallization and rectification, and high-efficiency separation of hexachloroethane, hexachlorobutadiene and hexachlorobenzene is realized; and by adopting a mode of the decompression sublimation, a sublimation temperature of the product is reduced, energy consumption of the whole technological process is effectively reduced, and production costs are greatly reduced.

A composition and method for extracting, recovering, removing, and / or reducing at least one harmful compound selected from a harmful polycyclic aromatic hydrocarbon (PAH), bisphenol A (BPA), a harmful phthalate, a harmful polychlorinated biphenyl (PCB), a harmful dioxin, a harmful hexachlorobenzene, or a harmful organotin from a harmful compound-containing material using harmful compound-extracting composition comprising a turpentine fluid.

The invention relates to a method for refining isophthalonitrile. The method comprises the following steps: introducing an isophthalonitrile crude product raw material into a distillation kettle, cooling the distilled isophthalonitrile steam by a heat exchanger, introducing the isophthalonitrile into a receiving kettle, keeping the temperature, and finally, slicing by a slicer to obtain the refined isophthalonitrile finished product. Compared with the prior art, the method provided by the invention can enhance the isophthalonitrile content in the product and lower the meta-cyanobenzamide content, thereby reducing the hexachlorobenzene content in the chlorothalonil product and lowering the residue mass in the melter in the chlorothalonil production device.