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

Catalyst for synthesizing 2-chloro-3,3,3-trifluoropropene from 1,1,2,3-tetrachloropropylene and preparation method thereof

The invention discloses a catalyst for fluoridizing chlorinated olefin. Alpha-AlF3 is used as a carrier, Cr2O3 is used as an active component, the Cr2O3 is loaded on the alpha-AlF3 carrier, the mass of the Cr2O3 is 0.6-13 percent of that of the alpha-AlF3, and the specific surface area of the catalyst is 90-125m g . The catalyst is prepared by adopting the steps of: dipping a chromic soluble salt solution on aluminum oxide by adopting a dipping method, drying and calcining to prepare a Cr2O3-gamma-AlO3 composite oxide; dipping a cane sugar water solution to the Cr2O3-gamma-AlO3 composite oxide, converting cane sugar into carbon through carbonization in the presence of N2 to obtain a carbon-containing Cr2O3-gamma-AlO3 composite oxide, fluoridizing the carbon-containing Cr2O3-gamma-AlO3 composite oxide by using an HF and N2 mixed gas to ensure that the carbon-containing Cr2O3-gamma-AlO3 composite oxide is converted into a carbon-containing Cr2O3-alpha-AlO3 composite; and finally, removing carbon through a combustion method.

Catalyst for fluoridizing chlorinated olefin and preparation method thereof

The invention discloses a catalyst for producing pentafluoroethane through a vapor phase method. According to the catalyst, chromium is taken as the main component, auxiliary component comprises zinc, and the molar ratio of chromium to zinc in the catalyst is 1: (0.02-0.15). A preparation method of the catalyst comprises the following steps of preparing chromium salt and zinc salt into a solution according to a proportion, reacting the prepared solution with a precipitator, filtering, drying, and roasting so as to obtain an oxide, grinding oxide into 100-200 mesh of particles, then tabletting and shaping so as to obtain a catalyst precursor, activating the catalyst precursor with anhydrous hydrogen fluoride so as to obtain the catalyst. The catalyst has high activity and selectivity at lower temperature, and has long service life.

Catalyst for producing pentafluoroethane through vapor phase method and preparation method 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 used for fluoridation. Aiming at the deficiencies that the activity is worse and the stability is not high in the prior catalyst used for producing FC-14 through gas phase fluorination, the invention provides a catalyst used for producing tetrafluoromethane through the gas phase fluorination and possessed of high activity, high selectivity, high stability and low application temperature, as well as the preparation method thereof. The catalyst of the invention comprises a carrier and an active ingredient, wherein, the carrier adopts the compound of aluminum; and the active ingredient adopt the compound of chromium. The catalyst of the invention comprises the following preparation process: firstly, the compound of Al and the compound of Cr are weighed out according to a certain proportion, after water is added and the compounds are uniformly mixed, a precipitating agent is added until the compounds are completely precipitated, then separation and washing are carried out until the filtrate is neutral, and the precipitate is dried; secondly, the dried precipitate is calcined after being shaped, so as to obtain a fluorination catalyst precursor; and thirdly, the fluorination catalyst precursor is processed by HF, so as to obtain the catalyst of the invention.

Catalyst for producing tetrafluoromethane by gas-phase fluorination and preparation method thereof

A high-activity durable fluorinating catalyst for preparing hydrocarbon fluorohydride contains proportionally Cr, In, Co, O and F. It is prepared through fluorinating an oxide or a hydroxide.

Fluorination catalyst, its prepn. method and use

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

Catalyst for producing tetrafluoromethane by gas-phase fluorination and preparation method thereof

Fluorination catalyst, its prepn. method and use