The invention discloses a method for synthesizing 3, 3, 3-trifluoro propene. The method is as follows: 1, 1, 1, 3-tetrachloropropane, catalyst and hydrofluoric acid are added in a high-pressure reactor used for deoxidization and dewatering, and are heated to a temperature of between 90 and 500 DEG C so as to carry out reaction for 0.5 to 3 hours, thereby obtaining 3, 3, 3-trifluoro propene product; moreover, the molar ratio between hydrofluoric acid and 1, 1, 1, 3-tetrachloropropane is between 3:1 and 300:1, and the mass ratio between catalyst and 1, 1, 1, 3-tetrachloropropane is between 0.005:1 and 10:1. The method can synthesize 3, 3, 3-trifluoro propene at high transformation efficiency and high selectivity with both the transformation efficiency and the selectivity reaching to more than 98 percent. Moreover, the method has the advantages of simple production equipment, short technological flow, long service life of catalyst, low price, high reaction transformation efficiency, ideal reaction selectivity and high product purity, etc.

Method for synthesizing 3,3,3-trifluoro propene

The invention discloses a catalyst for fluoridation, which is composed of a La2O3-NiO-Al2O3 compound oxide comprising, in mass fraction, 8% of La2O3, 2% of NiO and 90% of Al2O3, and Cr2O3, wherein the mass ratio of the La2O3-NiO-Al2O3 compound oxide to the Cr2O3 is (0.01 to 0.1): 1. The preparation method comprises the following steps of: preparing the La2O3-NiO-Al2O3 compound oxide at first, and then preparing Cr(OH)3; weighing the La2O3-NiO-Al2O3 compound oxide and Cr2O3 in a mass ratio of (0.01 to 0.1): 1; and adequately grinding and drying, and then roasting to prepare the catalyst. The catalyst is used for gas-phase fluorination synthesis for tetrafluoroethane from trichloroethylene or gas-phase fluorination synthesis for pentafluoroethane from tetrachloroethylene or gas-phase fluorination synthesis for tetrafluoropropene from tetrachloropropene, as well as is good in activity and selectivity.

Catalyst for fluoridation and preparation method for same

A process for preparing a catalyst, including the reactive milling of a first reagent, which is a chromium oxide compound, with a second reagent, which is a compound of the formula M z M′ 1-z O x F y , M and M′ each being an element having an oxidation state greater than or equal to 0, z being from 0 to 1, x being from 0 to 3, y being from 0 to 6, and 2x+y being greater than 0 and less than or equal to 6.

Catalyst prepared by reactive milling

The invention discloses a high-activity tungsten-based catalyst. The active metal of the catalyst is composed of a tungsten element and a cocatalyst with mass percentage of 60-100% and 0-40%; and the condition is characterized in that the cocatalyst is not Cr. In addition, the invention also discloses a preparation method of the high-activity tungsten-based catalyst. According to the invention, hydrogen fluoride gas is introduced in an activation phase, a part of molybdenum oxide is converted to oxyfluoride tungstic acid. The high-activity molybdenum-based catalyst has the advantages of safety, environmental protection, no harm, high catalytic activity, high catalysis stability, long usage life, and can be mainly used for performing gas phase catalysis on halogenated alkene to generate a fluorine-chlorine exchange reaction under high temperature condition to prepare fluorinated alkene.

High-activity tungsten-based catalyst, preparation method and purpose thereof

The invention discloses a high-activity molybdenum-based catalyst The active metal of the catalyst is composed of a molybdenum element and a cocatalyst with mass percentage of 60-100% and 0-40%; and the condition is characterized in that the cocatalyst is not Cr In addition, the invention also discloses a preparation method of the high-activity molybdenum-based catalyst According to the invention, hydrogen fluoride gas is introduced in an activation phase, a part of molybdenum oxide is converted to fluoride molybdate and molybdenum oxyfluoride acid The high-activity molybdenum-based catalyst has the advantages of safety, environmental protection, no harm, high catalytic activity, high catalysis stability, long usage life, and can be mainly used for performing gas phase catalysis on halogenated alkene to generate a fluorine-chlorine exchange reaction under high temperature condition to prepare fluorinated alkene

High-activity molybdenum-based catalyst, preparation method and purpose thereof

The invention relates to a catalyst used for making tetrafluoromethane through gas-phase fluorination and a preparation method thereof, and aims at providing a catalyst used for making tetrafluoromethane through gas-phase fluorination characterized by high activity and high stability and a preparation method thereof in consideration of poor activity and low stability existing in the existing gas-phase fluorination catalyst. The preparation method of the catalyst of the invention is as follows: one or more than one compound of Y, compound of Cr, compound of magnesium, aluminum, indium, gallium, zinc, scandium, strontium, iron, cobalt, nickel and cadmium are measured according to a certain proportion; the precipitator adopts one among ammonia, sodium hydroxide, ammonium carbonate, sodium carbonate and potassium hydroxide, and sediments are obtained by a coprecipitation method, and the precursor of the catalyst is obtained by baking and roasting the sediments then the catalyst is obtained after being treated with anhydrous hydrogen fluoride.

Catalyst for producing tetrafluoromethane with gas-phase fluoridation and production method

The invention relates to a catalyst for fluorination, especially a catalyst for producing HFC-134a in gas phase fluorination and the manufacturing method. Aiming at the lack of prior technology, the invention provides a catalyst for producing HFC-134a in gas phase fluorination with high activity and high stability and the manufacturing method. The catalyst comprises carrier and active component. The carrier adopts Y compound and the active component adopts Cr compound. The preparing process for the catalyst for producing HFC-134a in gas phase fluorination is that soluble Cr and Y salts are taken to be dissolved by water according to the proportion; it is mixed in uniformity; precipitant is added to make them precipitate; then the filter solution is neural after centrifugal separation and washing; it is dried; the dried precipitate is formed by tablet mould; the precursor of fluorination catalyst is obtained by baking; after it is treated dry by nitrogen, it is treated by HF without water; finally the catalyst is obtained.

Vapor-phase fluorination catalysts for producing HFC-134a and the preparing method

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Catalyst for producing tetrafluoromethane with gas-phase fluoridation and production method

Vapor-phase fluorination catalysts for producing HFC-134a and the preparing method