How to Phase-transfer catalyst?

Preparation of 2,2-bi-[4-(4-aminophenoxy)phenyl]propane,Process for producing fluoroolefins,Natural fiber composite material and preparation method thereof,Powder coating fluoropolymer compositions with aromatic materials,Phosphaphenanthrene flame-retardant compound containing s-triazine structure, and preparation and use thereof

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2908 results about "Phase-transfer catalyst" patented technology

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In chemistry, a phase-transfer catalyst or PTC is a catalyst that facilitates the migration of a reactant from one phase into another phase where reaction occurs. Phase-transfer catalysis is a special form of heterogeneous catalysis. Ionic reactants are often soluble in an aqueous phase but insoluble in an organic phase in the absence of the phase-transfer catalyst. The catalyst functions like a detergent for solubilizing the salts into the organic phase. Phase-transfer catalysis refers to the acceleration of the reaction upon the addition of the phase-transfer catalyst.

Preparation of 2,2-bi-[4-(4-aminophenoxy)phenyl]propane

InactiveCN1472193AEasy to operateImprove working environmentOrganic compound preparationAmino-hyroxy compound preparationActivated carbonAlcohol

A process for preparing 2,2-bis-[4-(4-aminophenyloxy)phenyl] propane includes such steps as reflux reacting between 4,4'-dihydroxydiphenyl propane (BPA), 1-chloro-4-nitrobenzene (CNB) and salting agent in the mixture of non-protonic transferring polar solvent and dewatering agent at 110-150 deg.C to obtain 2,2-bis-[4-(4-nitrophenyloxy)phenyl] propane (BNPP), and reducing in alcohol as solvent under action of hexahydrated iron chloride, activated carbon and hydrazine hydrate. Its advantages are simple process, low cost and high quality and output rate of product.

Owner:TANSUO SCI & TECH NANTONG CITY

Process for producing fluoroolefins

InactiveUS20030060670A1Preparation by hydrogen halide split-offOrganic chemistry methodsPhosphonium saltPtru catalyst

A process for producing a fluoroolefin of the formula: CF.sub.3CY.dbd.CX.sub.nH.sub.p wherein Y is a hydrogen atom or a halogen atom (i.e., fluorine, chlorine, bromine or iodine); X is a hydrogen atom or a halogen atom (i.e., fluorine, chlorine, bromine or iodine); n and p are integers independently equal to 0, 1 or 2, provided that (n+p)=2; comprising contacting, in the presence of a phase transfer catalyst, a compound of the formula: CF.sub.3C(R.sup.1.sub.aR.sup.2.sub.b) C(R.sup.3.sub.cR.sup.4.sub.d), wherein R.sup.1, R.sup.2, R.sup.3, and R.sup.4 are independently a hydrogen atom or a halogen selected from the group consisting of fluorine, chlorine, bromine and iodine, provided that at least one of R.sup.1, R.sup.2, R.sup.3, and R.sup.4 is halogen and there is at least one hydrogen and one halogen on adjacent carbon atoms; a and b are independently=0, 1 or 2 and (a+b)=2; and c and d are independently=0, 1, 2 or 3 and (c+d)=3; and at least one alkali metal hydroxide. The alkali metal hydroxide can be, for example, potassium or sodium hydroxide and the phase transfer catalyst can be, for example, at least one: crown ether such as 18-crown-6 and 15-crown-5; or onium salt such as, quaternary phosphonium salt and quaternary ammonium salt. The olefin is useful, for example, as an intermediate for producing other industrial chemicals and as a monomer for producing oligomers and polymers.

Owner:HONEYWELL INT INC

Natural fiber composite material and preparation method thereof

InactiveCN101798466AImprove waterproof performanceEasy to operateWater basedPolymer resin

The invention discloses a natural fiber composite material and a preparation method thereof. The natural fiber composite material is mainly prepared from the following components in parts by weight: 14-135 parts of water-based resin, 100-500 parts of natural fiber, 0.3-5 parts of hardener, 0.01-5 parts of phase transfer catalyst, 50-500 parts of filler and 100-200 parts of water. In the invention, the natural fiber can be fully coated only by a small amount of polymer resin to obtain the natural fiber composite material with excellent waterproof performance; and the modified natural fiber can be used as a raw material of waterproof fiber boards, bakelite powder padding and plastic-wood composites (WPC).

Owner:漳州市奈特新型建材有限责任公司

Powder coating fluoropolymer compositions with aromatic materials

InactiveUS20050080210A1CoatingsPolymer scienceCresol

Provided is a composition comprising an aromatic material selected from a polythiol aromatic compound or resin, a hydroxythiophenol compound or resin, a catechol novolak resin, a catechol cresol novolak resin, a polyhydroxy aromatic resin or compound comprising at least one aromatic ring having at least one hydroxyl group attached directly to the aromatic ring wherein at least one hydroxyl group is a phenolate salt, or a combination thereof, and a salt former compound capable of forming a salt with the aromatic material, a fluoropolymer, and optionally a phase transfer catalyst. Also provided are articles comprising powder-coated fluoropolymers with aromatic compounds, and methods for making the compositions and articles.

2908 results about "Phase-transfer catalyst" patented technology

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