49results about How to "Reduce isomerization" patented technology

A novel organophosphorus composition and synthesis thereof, the composition being characterized by one phosphite moiety, one phosoxophite moiety, and a plurality of sterically bulky substituents. The novel composition finds utility as a ligand in Group VIII transition metal phosoxophite complex catalysts and complex catalyst precursors that are used in carbonylation processes, preferably, hydroformylation processes. Additionally, there is disclosed a novel method of preparing a phosphoromonochloridite composition that finds utility as a precursor to the novel phosoxophite composition.

A pharmaceutical composition comprising as a first active ingredient an estrogen, such as estradiol or estradiol valerate, in sufficient amounts to treat disorders and symptoms associated with deficient endogenous levels of estrogen in women, and as a second active ingredient 6beta,7beta; 15beta; 16beta-dimethylene-3-oxo-17alpha-preg-4-ene-21,17-carbolactone (drospirenone, DRSP) in sufficient amounts to protect the endometrium from the adverse effects of estrogen is useful for, amongst others, treating peri-menopausal, menopausal and post-menopausal women. This composition may be used for hormone replacement therapy and may be administered as a multi-phased pharmaceutical preparation. This combination therapy may comprise continuous, sequential or interrupted administration, or combinations thereof, of DRSP and estrogen, each optionally in micronized form.

An improved hydroformylation process involving reacting one or more reactants, such as an olefin, with carbon monoxide and hydrogen in the presence of a hydroformylation catalyst, to produce a reaction product fluid comprising one or more products, preferably aldehydes; wherein said process is conducted in a region of the hydroformylation rate curve that is negative or inverse order in carbon monoxide, which is sufficient to prevent and / or lessen deactivation of the hydroformylation catalyst; and wherein total pressure is controlled at a predetermined target value and / or vent flow rate is controlled at a predetermined target value, by adjusting a flow of a carbon-monoxide containing inlet gas, so as to prevent and / or lessen cycling of process parameters, e.g., reaction rate, total pressure, vent flow rate, and / or temperature.

A novel bis-chelating composition characterized by formula I: wherein M is a Group VB element; R1 and R2 are each independently selected from hydrogen and monovalent hydrocarbyl radicals; or R1 and R2 are bonded together to form a diradical; or one of R1 or R2 is hydrogen or a monovalent hydrocarbyl radical, while the other of R1 or R2 is a hydrocarbyl radical bonded to an atom in Ar; wherein Ar is selected from 1,2-arylenes; Q is selected from 1,2-arylenes, 2,2′-bisarylenes and alkyl diradicals; and W is selected from II, III, IV, or V: wherein M is as defined hereinbefore; each R is independently selected from hydrogen and monovalent hydrocarbyl radicals; X is selected from alkyl and aryl diradicals; Ar1 and Ar2 are each independently selected from 1,2-arylenes;Ar3 and Ar4 are each independently selected from monovalent aryl radicals; and n in formula IV is 0 or 1. The composition finds utility as a ligand in catalysts for carbonylation processes

The invention relates to a preparation method of polycarboxylate water-reducing agent macromonomer methylallyl alcohol polyethenoxy ether, wherein the preparation method comprises the following process steps of: (1) adding oxirane in the presence of an acidic catalyst boron trifluoride-aether by taking methylallyl alcohol as an initial raw material for condensation reaction to obtain a methylallyl alcohol oligomer; (2) adding an alkali catalyst to the material, removing water or methanol under the condition of 100 DEG C for 1 hour, then adding the oxirane for condensation reaction, and then adding acetic acid for neutralization to obtain the methylallyl alcohol polyethenoxy ether. The preparation method disclosed by the invention is simple and safe in process, and the obtained product is high in relative molecular weight and high in iodine number.

The invention discloses a platinum complex catalyst as well as a preparation method and an application thereof, and relates to the field of platinum complex catalysts. The platinum complex catalyst comprises p-hydroxy benzaldehyde, citric acid, chloroplatinic acid hexahydrate and isopropyl alcohol, wherein a mole ratio of p-hydroxy benzaldehyde to citric acid to chloroplatinic acid hexahydrate is (1.2-1.3): (0.8-1): 1. The catalyst can be used for catalyzing hydrosilylation, particularly used for catalyzing hydrosilylation of allyl glycidyl ether and trimethoxy silane and used for synthesizing KH-560. On the basis of a Speier catalyst, a proper amount of p-hydroxy benzaldehyde and citric acid is added, compared with a conventional platinum complex catalyst, the platinum complex catalyst can maintain higher catalytic activity, shorten the induction period of the reaction, improve the catalytic efficiency of the reaction and increase the yield of KH-560 simultaneously when used for synthesizing KH-560, and in terms of trimethoxy silane, the yield is up to 91.2%.

The invention discloses a preparation method of a copolymer of sulfur dioxide and epoxy compounds; a novel polysulfone material is prepared by using SalenMX to catalyze the copolymerization of sulfur dioxide and epoxy compounds, adding epoxy compounds and SalenMX into a high-pressure reactor in sequence, and then injecting sulfur dioxide into the React at 50~100°C, react for 8~48 hours to obtain the product, namely sulfur dioxide and epoxy compound copolymer, dissolve the product in chloroform and precipitate with hydrochloric acid methanol mixture, filter the amber precipitate and wash it repeatedly with methanol for 2~4 times , the washed product is moved to a vacuum drying oven for 8 to 24 hours at room temperature and vacuum-dried to obtain a copolymer of sulfur dioxide and epoxy compounds with higher tacticity; the preparation method involved in the present invention is simple, the catalyst consumption is small, and the reaction The temperature is mild, the yield is high, the structure of the product is good, the cost is low, and industrial production is easy to realize.

The invention discloses a method for preparing a para-xylene catalyst by amino-modified methanol. The method adopts dioxane, mesitylene, glacial acetic acid, COF-1 nano material, FeSO4.7H2O and KBH4 as main raw materials. The method disclosed by the invention has the beneficial effects that unique processes and technical parameters are adopted, loads are generated by thermal expansion, amino modification and nano-iron reaction, and by thermal-expansion treatment, the surface adhesiveness of COF-1 is improved, and basis is provided for the following amino modification; by amino modification, the surface property is improved and the benefit for fully and uniformly loading the nano-iron generated in reaction onto porous carriers is achieved; by alkylation reaction of methanol, para-xylene isobtained, so that the steps of isomerization and the like in the traditional process are omitted, the process route is shortened and the once-through yield of the para-xylene is greatly increased.

This invention describes natural hop products that are stable solutions of alpha-acids, as well as their preparation and their use for post-fermentation addition to beer for the purpose of improving the foam quality, as measured by foam stability and foam cling. Improvements in the stability (both physical and chemical) of the alpha-acids are described by incorporation of iso-alpha-acids and tetrahydroiso-alpha-acids as well as various brewery-acceptable co-solvents. The alpha-acids also improve the physical stability of the reduced iso-alpha-acids, including tetrahydroiso-alpha-acids.