30 results about "Brominated hydrocarbon" patented technology

The invention provides a stainless steel degreasing agent, which comprises the following components in percentage by weight: 5 to 25 percent of organic solvent, 2 to 5 percent of corrosion inhibitor, 10 to 25 percent of surfactant, 5 to 10 percent of inorganic salt, 1 to 3 percent of defoaming agent and the balance of deionized water, wherein the organic solvent is bromohydrocarbon; the corrosion inhibitor is sodium benzoate, ammonium benzoate, triethanolamine, ethanolamine or benzotriazole; the surfactant is one or more of alkylphenol polyoxyethylene ether and fatty alcohol-polyoxyethylene ether; the inorganic salt is alkaline salt; and the defoaming agent is tributyl phosphate, organic silicon, oleic acid or sodium oleate. The stainless steel degreasing agent can replace the currently used ODS cleaning agents, can achieve the cleaning effect of the ODS cleaning agents, does not damage the surface of the stainless steel, has obvious cleaning effect, can clean a large number of products, and does not harm a human body; and the preparation method is simple, safe, and environment-friendly.

The invention provides a method for synthesizing quaternary ammonium salt ionic liquid by microwave radiation heating, which comprises the following steps: mixing tertiary amine compounds (N,N-dimethylethanolamine, trimethylamine or triethanolamine) and halohydrocarbon compounds (allyl chloride, n-butyl chloride, n-butyl bromide, octadecyl chloride) with a molar ratio of 1:1.05-1:2 under a microwave radiation heating condition, putting the mixture into a microwave reactor to perform a microwave reaction with an adjusted microwave power of 100 W-400 W, a heating temperature of 30 DEG C-80 DEG C, and reaction time of 1 min-15 min so as to obtain a crude product, removing residual halohydrocarbon compounds in the crude product to obtain quaternary ammonium salt ionic liquid with halogens as anions; the halohydrocarbon compounds are chlorinated hydrocarbon compounds or brominated hydrocarbon compounds. The preparation method of the invention is simple, does not require the addition of any solvent except reaction raw materials, and can prepare high-purity quaternary ammonium salt ionic liquid simply, efficiently, rapidly, and economically.

A fire retardant material is described that includes a polyamide and a brominated hydrocarbon. The brominated hydrocarbon makes up between about two percent and about 25 percent of the fire retardant material.

The invention discloses a series of alkynyl quaternary ammonium salt multifunctional surfactants and a preparation method thereof. A structural formula of quaternary ammonium salt is shown in the description, wherein R represents a C4-C22 linear, branched or cycloalkyl, aryl or alkenyl group. The preparation method comprises the following steps: (1) carrying out alkylation on ethanol amine under alkaline and acetonitrile reflux conditions by virtue of bromo-hydrocarbon; and (2) carrying out further alkylation on tertiary amine under an ethanol reflux condition by virtue of propargyl bromide, so as to obtain alkynyl quaternary ammonium salt, namely reddish brown semitransparent viscous liquid or solid. The alkynyl quaternary ammonium salt multifunctional surfactants have very high surface activity, good corrosion resistance and excellent viscoelasticity, the preparation method is simple and feasible, the raw material cost is low, the operation is easy, the yield is high, and the surfactants are environmentally friendly.

The invention discloses a method for preparing a solvent system capable of dissolving cellulose under a room temperature condition. The solvent system is composed of ionic liquid and dimethyl sulfoxide, wherein anions in the ionic liquids are acetate ions, cations are N-R1 and N-R2 imidazole cations; in the formula, R1 is methyl or ethyl, R2 is ethyl, allyl or butyl. The method comprises the following preparation steps: mixing and fully dissolving N-methylimidazole or N-ethylimidazole and the dimethyl sulfoxide; slowly dripping bromo-hydrocarbon R2Br under an ice bath condition to react; heating to carry out a reflux reaction at a temperature of 40-70 DEG C; and adding a saturated lead acetate or silver acetate solution, stirring to react, filtering precipitate, and removing water in filtrate through a rotary evaporation method to prepare the solvent system. The method disclosed by the invention has the advantages that the preparation method is short in reaction time, free of pollution and high in synthesis efficiency and conversion rate; and the solvent system can dissolve a large amount of non-activated or non-pretreated cellulose under the room temperature condition.

A method for separating aromatic hydrocarbon and sulfur-containing aromatic hydrocarbon from heavy aromatic hydrocarbon. The method comprises the steps of: separating aromatic hydrocarbon components from heavy oil; adding an organic solution of PdCl2 into the separated aromatic hydrocarbon components and by fully mixing and reacting; then adding saturated hydrocarbon for liquid phase extraction; adding the saturated hydrocarbon solution obtained from liquid phase extraction into an extraction column filled with a stationary phase, so that the aromatic hydrocarbon components and aromatic sulfur-containing hydrocarbon components absorbed by the stationary phase; washing the stationary phase with saturated hydrocarbon to obtain a solution containing aromatics; then flushing the stationary phase with a polar solvent to obtain a solution containing sulfur-containing aromatic solution; respectively evaporating solvents in the solution containing aromatic hydrocarbon and the sulfur-containing aromatic solution, so as to obtain the aromatic hydrocarbon and sulfur-containing aromatic hydrocarbon. The solvent in the organic solution of PdCl2 is methanol and / or cetonitrile, and the stationary phase is aminopropyl silica gel and / or mercapto propyl silica gel. The method can effectively separate aromatic and aromatic hydrocarbon and sulfur-containing aromatic hydrocarbon in the aromatic hydrocarbon components, and has simple convenient and quick operation.

The invention discloses amino-acid ester bromide type chiral ionic liquid and a preparation method thereof. The general formula of the amino-acid ester bromide type chiral ionic liquid is A<+>Br<->, wherein A<+> is an amino-acid ester positive ion. The preparation method comprises the following steps: performing reaction on amino acid, methyl alcohol and thionyl chloride under low temperature to obtain amino-acid ester hydrochloride; performing mannich reaction on amino-acid ester hydrochloride, paraformaldehyde and acetone to obtain amino-acid ester mannich base; performing reaction on amino-acid ester mannich base and bromo-hydrocarbon to obtain the amino-acid ester chiral ionic liquid. The chiral amino-acid ester ionic liquid prepared through the preparation method disclosed by the invention has the advantages of high selectivity and chiral induction effect of a chiral substance, and non-volatilization, non-toxicity and no pollution of ionic liquid and is suitable for scale production of the fine chemical industry.

The invention provides a synthesis method of dimethyl octenone. The method comprises the following steps: (1) adding 3-pentanone, 50 wt% of basic catalyst, and a phase transfer catalyst into a four-neck flask with a stirring function, and heating to 20-50 DEG C while stirring; (2) dropwise adding 3, 3-dimethyl allyl bromide, continuously stirring for 1 hour after dropwise adding, sampling and detecting, stopping stirring when the 3, 3-dimethyl allyl bromide is completely reacted, and standing for layering to obtain an organic phase and a water phase; and (3) extracting the water phase obtainedin the step (2) by using 3-pentanone to obtain an organic phase, combining the organic phase with the organic phase obtained in the step (2), and distilling to obtain a dimethyl octenone finished product. According to the synthesis method of the dimethyl octenone, a bimolecular nucleophilic substitution reaction (SN2) of halogenated hydrocarbon is carried out, and a-site hydrogen of carbonyl is substituted with long-chain branched chain brominated hydrocarbon; the method is simple in process route, capable of being completed in one step and mild in condition.

The invention discloses a method for industrially producing dialkyl dialkoxy silane, which comprises the following steps: in the presence of a catalyst and a solvent A, heating brominated hydrocarbonA and metal magnesium to reflux, and initiating reaction to obtain a first reaction solution; synchronously and dropwise adding chlorinated hydrocarbon and brominated hydrocarbon B which are diluted by a solvent B into the first reaction solution, and continuing reaction to obtain a second reaction solution; dropwise adding the second reaction solution into alkyl trialkoxy silane, and carrying outreflux reaction to obtain a third reaction solution; and cooling the third reaction solution, carrying out solid-liquid separation, and finally, carrying out washing and rectifying to obtain the dialkyl dialkoxy silane. The Grignard reaction of the chlorinated hydrocarbon is promoted by utilizing the high activity of the brominated hydrocarbon, so that on one hand, the overall conversion rate ofthe Grignard reaction can be remarkably improved, byproducts are reduced, the yield of a final product is improved, and on the other hand, the production cost can be reduced.

The present invention provides a method of converting a brominated hydrocarbon to a chlorinated hydrocarbon that involves contacting together the brominated hydrocarbon and a chlorinated ion exchange resin that has a water content of less than or equal to 30 percent by weight, based on the total weight of the chlorinated ion exchange resin and the water. The brominated hydrocarbon includes at least one replaceable bromo group, where each replaceable bromo group is independently covalently bonded to an sp³ hybridized carbon. Contact between the brominated hydrocarbon and the chlorinated ion exchange resin results in replacement of at least one replaceable bromo group of the brominated hydrocarbon with a chloro group, and correspondingly conversion of at least a portion of the brominated hydrocarbon to the chlorinated hydrocarbon.

The invention discloses a method which is characterized in that methane is converted into bromohydrocarbon by bromine oxidation reaction, and bromohydrocarbon is further prepared into acetyl bromide, acetic acid and acetic ester. Firstly, methane, HBr/H2O and oxygen react to generate bromo-alkane and CO; the catalyst is a composite catalyst prepared by mixed hydrolysis, drying and roasting of silicon precursor and metallic compound precursor capable of dissolving in water; then, bromo-alkane and CO react to prepare acetyl bromide; then, acetyl bromide and water react to generate acetic acid, or the acetyl bromide reacts with alcohol to generate acetic ester.