198 results about "Alkyl bromide" patented technology

A process for converting gaseous alkanes to olefins and liquid hydrocarbons wherein a gaseous feed containing alkanes is reacted with a dry bromine vapor to form alkyl bromides and hydrobromic acid vapor. The mixture of alkyl bromides and hydrobromic acid are then reacted over a synthetic crystalline alumino-silicate catalyst, such as an X or Y type zeolite, at a temperature of from about 250° C. to about 500° C. so as to form olefins, higher molecular weight hydrocarbons and hydrobromic acid vapor. Various methods are disclosed to remove the hydrobromic acid vapor from the higher molecular weight hydrocarbons and to generate bromine from the hydrobromic acid for use in the process.

A process for converting gaseous alkanes to olefins, higher molecular weight hydrocarbons or mixtures thereof wherein a gaseous feed containing alkanes is thermally reacted with a dry bromine vapor to form alkyl bromides and hydrogen bromide. Poly-brominated alkanes present in the alkyl bromides are further reacted with methane over a suitable catalyst to form mono-brominated species. The mixture of alkyl bromides and hydrogen bromide is then reacted over a suitable catalyst at a temperature sufficient to form olefins, higher molecular weight hydrocarbons or mixtures thereof and hydrogen bromide. Various methods are disclosed to remove the hydrogen bromide from the higher molecular weight hydrocarbons, to generate bromine from the hydrogen bromide for use in the process, and to selectively form mono-brominated alkanes in the bromination step.

A process for converting gaseous alkanes to olefins, higher molecular weight hydrocarbons or mixtures thereof wherein a gaseous feed containing alkanes is reacted with a dry bromine vapor to form alkyl bromides and hydrobromic acid vapor. The mixture of alkyl bromides and hydrobromic acid is then reacted over a suitable catalyst at a temperature sufficient to form olefins, higher molecular weight hydrocarbons or mixtures thereof and hydrobromic acid vapor. Various methods are disclosed to remove the hydrobromic acid vapor from the higher molecular weight hydrocarbons, to generate bromine from the hydrobromic acid for use in the process, and to selectively form monobrominated alkanes in the bromination step.

The invention relates to a kind of arylenealkyne resin containing siloxanes. The said resin makes diethynylene benzene (DEB) and silicon alkyl chloride as raw materials, firstly make use of the reaction of magnesium and alkyl bromide to produce Grignard reagentú¼then react with DEB to produce alkyne Grignard reagent; then react with silicon alkyl chloride, finally hydrolyze and condense in alkaline water liquor, or extend chain with siloxanes chloride, to form a kind of arylenealkyne resin containing siloxanes of new-style structure. The resin designed and synthesized by the invention has good processing property, and can be solidified into crosslinked resin of good thermostability under heat, light or radiative condition. Besides it has good machine capability, electric insulation capability and ceramic performance. So it can be used as the base material of high performance compound material resin, insulation material, the ceramic precursors and so on, and also has wide application prospect in such high technology fields as spaceflight, aviation, navigation and so on.

The invention discloses an oil soluble built high effective antirust additive and preparing method, which comprises the following steps: allocating 12-30 wt polyhydroxy carboxylic acids, 40-60 wt oleic acid acetal amide boric acid ester, 3-6 wt bromide triethyl cetyl ammonium, 2-6 wt alkyl group bromine generation ammonium salt, 10-30 wt dioctyl regular sebacate, 20-30 wt trolamine, 0. 7-1. 3 wt wool alcohol; getting the product. This product possesses good oil solubility, which can be used as antirust agent for ferrous metal and non-ferrous metals.

The invention relates to a method for preparing hydrophobically modified xanthan. The method comprises the following steps: taking water/iso-propyl alcohol mixing liquid as a solvent, taking ammonium lauryl sulfate as an emulsifying agent, taking alkyl bromide as an etherifying agent, and carrying out reaction under the temperature of 30 to 120 DEG C and the pH of 6 to 9 to modify xanthan to obtain the hydrophobically modified xanthan. The conditions of a synthesis reaction are wild, raw materials are easy to obtain, monomer conversion is high, and products are convenient to process. The hydrophobically modified xanthan still has higher viscosity when the xanthan has lower molecular weights, has good salt resistance, has good degradable performance so as to be convenient to perform subsequent sewage treatment, and has good environment affinity. The method is suitable for the oil extraction production of high salinity oil reservoirs.

The invention discloses a simple preparation method of benzothiazole salt ionic liquid and application thereof to organic catalytic synthesis. In the invention, the benzothiazole salt ionic liquid has a novel structure, benzothiazole N-alkyl quaternary ammonium salt is used as cations (alkyl is one of n-C4H9, n-C5H11 and n- C6H13), BF4<-> or PF6<-> is used as anions. In the preparation method, benzothiazole, chloralkane, alkyl bromide and alkali metal salt or ammonium salt which contains the target anions react in one step under a solvent-free condition. In the invention, the one-step method is used for preparing the benzothiazole salt ionic liquid, therefore, the preparation yield is greatly increased, the use of substrates with high toxicity and high price is avoided, the consumption of organic solvents is reduced, the excessive use of a certain reaction component is avoided, the preparation process is simplified and high product yield is ensured. Therefore, the method has god economy and environmental friendliness and is suitable for mass preparation. The benzothiazole salt ionic liquid can be used as a mild, exclusive and efficient catalyst in benzoin condensation and Biginelli condensation and can be recycled and reused many times.

The present invention relates to hexa-alkyl guanidine salt ion liquid and its preparation process. The materials 1 ,3-dimethyl-2-imidazolinone and tetra-alkyl urea are produced into intermediate Wilsman salt under the action of phosphorus oxychlooride, oxalyl chloride, thiophosgene, phosgene or dichluoro sulfoxide; the intermediate is then reacted with C10 below aliphatic amine to produce penta-alkyl guanidine; and penta-alkyl guanidine is finally reacted with alkyl bromide or alkyl iodide and methyl or ethyl ester to produce hexa-alkyl guanidine salt ion liquid. The bromine salt and iodine salt may further reacted with various inorganic salt to produce hexa-alkyl guanidine salt ion liquid containing various negative ions. The present invention lays down foundation for the research and development of ionic liquid and provides systemic technology for the industrial production of hexa-alkyl guanidine salt ion liquid..

Processes and systems for synthesizing hydrocarbon products, such as high molecular weight hydrocarbons, olefins or mixtures thereof, from alkyl bromides wherein one or more streams of alkyl bromides may be reacted in sequential or concurrent stages at different temperatures. The catalyst used in the synthesis stages may be the same or different and at least in one instance is chosen to form hydrocarbon products having a significant C₆₊ paraffin content. The stages may be conducted in one or more reactors and the catalyst may be deployed in fixed beds or fluidized beds.

The process of preparing polyether with end capping alkyl group belongs to the field of polyether synthesis technology. The process includes the reaction of polyether with sec hydroxyl group in the end of molecular chain and strong nucleophilic reagent alkali, the further reaction with alkyl halide, neutralizing with alkali, water washing and filtering to obtain polyether with end capping alkyl group. The strong nucleophilic reagent alkali is alcohol solution of sodium methoxide, alcohol solution of potassium methoxide, solid sodium methoxide, solid potassium methoxide or their mixture; and the alkyl halide is C1-C4 alkyl chloride or alkyl bromide. The present invention has very high reaction activity and effectively raised end capping rate.

The invention relates to a synthesis method of hyperbranched polymers and modification of an epoxy curing product by the hyperbranched polymers. The hyperbranched epoxy polymers are prepared by two reaction steps. In the first step, triatomic phenol and bifunctional alkyl bromides with different carbon chain lengths used as raw materials react to obtain the hyperbranched polymers of which the terminal group is phenolic hydroxyl group. The phenolic hydroxyl group is modified to obtain the polyether-type hyperbranched epoxy polymers of which the terminal group is epoxy group. The modified epoxy material is implemented by introducing different mass percents (3-20%) of hyperbranched polymers into the bisphenol A epoxy resin curing system; and the impact strength and tensile strength of the obtained material are greatly enhanced, and the glass transition temperature is increased.

The invention relates to a pyridylurea biquaternary ammonium salt as well as a preparation method and application thereof. The preparation method of the pyridylurea biquaternary ammonium salt comprises the following steps: using 3-aminopyridine as a staring material, conducting reaction on 3-aminopyridine and triphosgene to obtain 1,3-bi(3-pyridyl)urea, and conducting reaction on 1,3-bi(3-pyridyl)urea and alkyl bromide under the solvent-free condition to prepare the pyridylurea biquaternary ammonium salt. According to the method, a solvent-free method is adopted to prepare the pyridylurea biquaternary ammonium salt, so that the environment can be protected, and the yield is relatively high. The provided pyridylurea biquaternary ammonium salt can be used as a plant growth regulator to promote plant cell division, and the problem that the traditional phenylurea plant growth regulator is poor in water solubility is solved.

A process for converting gaseous alkanes to olefins, higher molecular weight hydrocarbons or mixtures thereof wherein a gaseous feed containing alkanes may be thermally or catalytically reacted with a dry bromine vapor to form alkyl bromides and hydrogen bromide. Poly-brominated alkanes present in the alkyl bromides may be further reacted with methane over a suitable catalyst to form mono-brominated species. The mixture of alkyl bromides and hydrogen bromide may then be reacted over a suitable catalyst at a temperature sufficient to form olefins, higher molecular weight hydrocarbons or mixtures thereof and hydrogen bromide. Various methods and reactions are disclosed to remove the hydrogen bromide from the higher molecular weight hydrocarbons, to generate bromine from the hydrogen bromide for use in the process, to store and subsequently release bromine for use in the process, and to selectively form mono-brominated alkanes in the bromination step. One or more of the reactions of the processes of the present invention may be conducted in a microchannel reactor.

The invention provides a preparation method of a novel polyphosphazene alkaline membrane for a fuel cell. The preparation method of the polyphosphazene alkaline membrane comprises the following steps of: performing a quaternary phosphatization reaction on polyphosphazene loaded with benzyl bromide or alkyl bromide at the tail end of a branch chain and a quaternary phosphatization reagent to obtain quaternary phosphatization polyphosphazene; dissolving into an organic solvent, and performing curtain coating and membrane forming; and soaking with an alkaline liquor, wherein triaryl phosphine or trialkyl phosphine can be taken as the quaternary phosphatization reagent. A preparation method of a polyphosphazene crosslinked alkaline membrane comprises the following steps of: doping a crosslinking agent into the quaternary phosphatization reagent; reacting with polyphosphazene loaded with benzyl bromide or alkyl bromide at the tail end of a branch chain to obtain crosslinked quaternary phosphatization polyphosphazene; dissolving into an organic solvent, and performing curtain coating and membrane forming; and soaking with an alkaline liquor, wherein the crosslinking agent can be a polyethylene glycol sodium salt or diamine. A preparation method of a polyphosphazene coblended alkaline membrane comprises the following steps of: doping a polyalcohol into quaternary phosphatization polyphosphazene; performing curtain coating and membrane forming; and soaking with an alkaline liquor, wherein the polyalcohol can be polyethylene glycol or polyvinyl alcohol.

The invention relates to N, N-dimethyl-N [3-(carbohydrate amide group)] propyl group-N-alkyl ammonium bromide of which the general formula of structure is as follows: wherein the R is a long chain alkyl of the C8-C14; and the glycosyl is a single-glycosyl or a dual-glycosyl. The synthetic method provided by the invention has the advantages that the synthetic process is simple, the requirement to equipment is low, the method is suitable for industrialization, the required reaction temperature is low, pressure and catalyst are not required, the reaction positions on the glycosyl are certain, the reaction is balanced, the amount of generated substitution products is not large, and the productivity is high.

The invention discloses a dog-bone-shaped gold nanocrystal preparing method. The dog-bone-shaped gold nanocrystal preparing method includes the steps of adding an aqueous cetyl ammonium bromide solution in an aqueous chloroauric acid solution, adding a silver nitrate solution, mixing fully, adding ascorbic acid, and mixing with stirring to obtain a growth solution; mixing the aqueous cetyl ammonium bromide solution with the aqueous chloroauric acid solution, adding a sodium borohydride solution, and stirring until the mixed solution turns into claybank so as to obtain a seed solution; adding the seed solution in the growth solution, mixing with stirring, and standing for growing to obtain dog-bone-shaped gold nanocrystals. The dog-bone-shaped gold nanocrystal preparing method has the advantages of easily-available raw materials, simplicity in operation, good repeatability, low cost, high controllability and capabilities of obtaining stable and efficient dog-bone-shaped gold nanocrystal and obtaining different sizes of dog-bone-shaped gold nanocrystals by means of reacting condition adjustment, has important application value for synthesis of large-scale dog-bone-shaped gold nanocrystals and is of important guiding significance to gold nanocrystal preparing method research.

Process and system that include the conversion of alkyl bromides to higher molecular weight hydrocarbons in circulating catalyst reactor-regenerator systems. Alkyl bromides may be reacted over a catalyst in at least one conversion reactor to produce at least an effluent stream comprising higher molecular weight hydrocarbons and hydrogen bromide. A portion of the catalyst may be removed from the conversion reactor. The portion of the catalyst may be contacted with a stripping gas to displace hydrocarbons from the portion of the catalyst. The portion of the catalyst may be contacted a first inert gas. The portion of the catalyst may be contacted with oxygen to form a regenerated catalyst by removal of coke. The regenerated catalyst may be contacted with a second inert gas. At least a portion of the regenerated catalyst may be introduced into the conversion reactor.