51 results about "Chlorinated solvents" patented technology

The invention provides methods of producing colloids of nanoscale metallic particles particularly useful in the in situ environmental remediation of chlorinated solvents. The methods include ball milling an elemental metal to form a colloid of nanoscale metallic particles having ideal size and metallurgical properties to enhance the reductive dehalogenation of halogenated hydrocarbons.

A radiographic contrast medium is disclosed, comprising a liposome which is comprised of vesicles including a water- and soluble nonionic iodine compound, and the contrast medium containing substantially no chlorinated solvent. There is also disclosed a method of preparing the radiographic contrast medium using supercritical or subcritical carbon dioxide.

The induction of reducing conditions and stimulating anaerobic process through the addition of dried micro-blue green algae (Spirulina, Arthorospira Platensis, Arthrospria Maxima, Aphanizomen flos-aquae, and chlorella) and seaweed (Dulse, Nori, and Kelp) to accomplish accelerated dechlorinization of soil and groundwater contaminated with chlorinated solvents and heavy metals.

The invention relates to a method for preparing dihydroquercetin from larches, which is characterized by comprising the following steps: carrying out reflux extraction on larch wood flour as raw material by using an alcohol solution for one time and filtering to obtain an extraction liquid; adding strong acid ion exchange resin and a chlorinated solvent to the extraction liquid; carrying out reflux hydrolysis to convert bound dihydroquercetin into free dihydroquercetin; separating a chlorinated solvent phase after the reaction is ended; concentrating to dryness; and recrystallizing to obtain the product. The operation process is mainly characterized in that the energy consumption is less, the hydrolysis and the extraction are simultaneously completed, the production cost is low and the yield is high; the catalytic hydrolysis process of the strong acid ion exchange resin does not generate pollution, and all solvents can be recycled, and thereby, the industrial scale production becomes convenient.

The invention discloses a heat vulcanized adhesive for adhering a vulcanized rubber or a thermoplastic rubber with a hard panel. The heat vulcanized adhesive comprises a crosslinking agent N,N'-dinitroso-p-phenylene dihydroxy disodium, halogenated rubber, metal oxide such as zinc oxide or magnesium oxide, inertia stuffing such as carbon black or titanium dioxide, a solvent such as aromatic hydrocarbon, chloride solvent or ketone solvent, a polybismaleimide compound such as N,N'-m-phenylene bismaleimide or diphenylmethane bismaleimide, and a vulcanizing agent such as sulphur, selenium or tellurium. The heat vulcanized adhesive has the characteristics that the heat vulcanized adhesive does not comprise aromatic polynitroso compound, adduct of perhalogenated cyclic conjugated diene/olefinic unsaturated dienophile, and copolymer formed by halogenated butadiene monomer/alpha-halogen substituted monomeric compound, and also does not comprise any one of alkoxy silane/polymer of nitrosobenzene or nitrosobenzene precursor combination; meanwhile, the heat vulcanized adhesive has pre-heating-resistance or is suitable for the requirement of injection molding process, and has the slat mist resistance and boiled water resistance.

The present invention relates to a process for the production of (-)3,4-divanillyl tetrahydrofiran of formula (2) which comprises (a) isolating) (-) secoisolariciresinol of formula (1) from the heartwood and roots of Taxus wallichiana by an improved process which consists of partitioning of the alcoholic extract of the heartwood and roots of T. wallichiana between water and chlorinated solvent, (b) extracting the chlorinated solvent extract with alkali and (c) isolating (-) secoisolariciresinol from the alkali extract upon neutralization with mineral acid and extracting with organic solvent and (d) crystallizing it from suitable organic solvent, (e) dissolving the isolated (-) secoisolariciresinol in suitable organic solvent and (f) reacting with triphenyl phosphine halide at 0-80° C. for 1-10 hours and (g) isolating (-) 3,4-divanillyl tetrahydrofuran by column chromatography.

The invention discloses a method for preparing 7-phenylacetamido-3-chloromethyl-4-carboxylic acid p-meth-oxybenzyl ester. The method comprises the following steps of: adding nitrogen heterocyclic butanone sulfinic acid which is a primary standard substance, a chlorinated solvent and a catalyst which is 1 to 5 percent of the primary standard substance by weight into a reaction kettle; starting a recycle pump to cycle materials through a film chlorinator; aerating chlorine gas into the film chlorinator by using air as a carrier to perform a chlorination reaction; stopping the aeration of the chlorine gas, and withdrawing and reclaiming chlorinated solvent, when the reaction is completed; adding a ring closure solvent and dropping a ring closed agent into the film chlorinator, and adding a pH regulator into the film chlorinator at a temperature of between 20 and 25 DEG C to regulate the pH value to between 4 and 6; keeping on stirring, feeding, centrifugalizing the materials, washing the materials with solvent, and drying to produce the product. The whole process is performed at normal temperature, thereby avoiding a harsh condition of deep cooling below 40 DEG C below zero, and facilitating the industrial operation. The method reduces the investment of a deep cooling unit, reduces the equipment investment, reduces electrical load, reduces the production cost of the product, and improves market competitiveness.

The present disclosure relates to sulfur-containing zerovalent iron nanoparticles and the use of same for transforming chlorinated solvent pollutants and which may therefore be useful as water treatment technology for restoration of groundwater resources contaminated with toxic, chlorinated solvent pollutants.

A prediction and assessment tool for bioremediation performance based on a comprehensive understanding of the link between chemical flow and microbial community interactions includes linking molecular microbial ecology data with electron and alkalinity balances to make it possible to understand dechlorinating microbial communities and their metabolic processes. The interactions of biological processes and site mineralogy result in changes to alkalinity and pH that can lead to incomplete reductive dechlorination resulting from suboptimal pH. Understanding these interactions allows for strategies to predict expected bioremediation outcomes and/or to mitigate incomplete reductive dechlorination.

A process for preparing 4,6-dichloropyrimidine from 4,6-dihydroxypyrimidine in the presence of a tertiary amine base characterised in that phosgene is added to a mixture of 4,6-dihydroxypyrimidine and a tertiary amine of formula R<1>R<2>R<3> N (wherein R<1>, R<2>, R<3> are, independently C1-10 alkyl, phenyl, a 3-7 membered carbon nitrogen heteroaryl group or phenyl(C1-4)alkyl) in a chlorinated solvent, wherein the molar ratio of 4,6-dihydroxy-pyrimidine:base:phosgene is in the range 1:(0.8 to 2.5):(2.5 to 3.6).

Disclosed are semiconducting polythiophenes comprising a repeating unit of Formula (A) or a copolythiophene of Formula (B):

wherein A and B are each alkyl having from 1 to about 25 carbon atoms; and a, b, c, d, e, f, g, x, and y are as defined herein. These polythiophenes have high mobility and are soluble in common organic solvents, so that chlorinated solvents do not need to be used. They are useful for depositing semiconducting layers, particularly in organic thin-film transistors.

The invention relates to a two-stage method and one-pot synthesis method for preparing aliphatic diisocyanate. The two-stage method or the one-pot synthesis method is adopted for preparing aliphatic diisocyanate through aliphatic diamine and diaryl carbonic ester. Also, aliphatic polyamine and diaryl carbonic ester also can be used for preparing polyisocyanates. According to the synthesis method provided by the invention, phosgene or highly toxic reagents and a chlorinated solvent are not adopted during the whole process.

The invention discloses a process for the preparation of the polymorh A of doxazosin meylate, consisting essentially of reacting doxazosin base with methanesulfonic acid in a mixture of solvents containing an alcohol and a chlorinated solvent, subsequently removing the chlorinated solvent by distillation and precipitating the desired product in an alcohol, after heating the suspension formed to the reflux temperature of the solvent.

Described is a low-emission adhesive, whose polymers are dissolved in a mixture of acetone and ethanol. The adhesive is characterized by very low emissions of solvents, with otherwise equally good properties compared to standard solvent-synthetic resin based adhesives. In particular with respect to viscosity and spreadability, surface tension, depth of penetration, wettability, simplicity and speed of processing, as well as adhesion, gluing strength and adhesive spectrum, the adhesive of the invention is equal to other adhesives based on solvents and thus superior to dispersion-adhesives that are based on aqueous solutions. Due to its low solvent emissions and absence of chlorinated solvents, the present adhesive is suitable for applications for which only dispersion-adhesives that are based on aqueous dispersions were reserved until now. This is true in particular for applications in enclosed spaces. The adhesive is very suitable for gluing of wooden floors in internal construction work.

A composition of matter and a solvent system for use in providing a water resistant coating to basement walls is disclosed. The solvent system comprises a chlorinated solvent blend. The solvent system and coating composition have no flash point, are non-flammable and provide an improved consistent coating when applied to walls.

A process of bioremediation of chlorinated solvents is provided. The process involves stimulating a microbial biomass of bacteria having oxygenase activity through the introduction of natural organic matter, such as a soluble humate, into a contaminated aquifer. The resulting increase in bacterial biomass results in the cometabolism of chlorinated solvents. The process allows remediation of a contaminated aquifer under aerobic conditions.

A composition of matter and a solvent system for use in providing a water resistant coating to a surface of a roof is disclosed. The solvent system comprises a chlorinated solvent blend which includes a vegetable oil. The solvent system and coating composition are non-flammable, environmentally friendly and provide an improved, consistent coating when applied to the surface of a roof.

The invention provides a method for extracting isofraxidin from acanthopanax roots. According to the method disclosed by the invention, by virtue of extraction in combination hydrolysis in situ, glycosides prepared by binding isofraxidin and glucose, namely binding state isofraxidin, can be totally transformed into free state isofraxidin, so that the content of the isofraxidin in the extracting solution is increased, wherein an H<+> type ion exchange resin serves as a catalyst for promoting hydrolysis of the binding state isofraxidin, and a chlorinated solvent serves as an extraction agent forextracting the free state isofraxidin. Therefore, in the process of extraction in combination hydrolysis in situ, hydrolysis of the binding state isofraxidin and extraction of the free state isofraxidin are simultaneously completed. Moreover, the in-situ hydrolysis extraction method provided by the invention effectively avoids onerous two-step operations of hydrolysis and extraction, the operating procedures and the usage amount of the solvent are reduced, the production cost is low, and the yield of the isofraxidin is high.