Co-production preparation method of 2-chloro-3,3,3-trifluoropropene and 2,3-dichloro-1,1-difluoro propylene

Disclosed is a process for the preparation of 3,3,3-trifluoropropene comprising the steps of; (1) fluorination of 240fa to form 245fa; (2) conversion of 245fa to a cis/trans mixture of 1234ze; (3) hydrogenation of the cis/trans mixture of 1234ze to form 254fb; and (4) dehydrofluorination of 254fb to produce 3,3,3-trifluoropropene. Alternatively or additionally, a second process for the preparation of the desired compound comprises the following steps; (1) fluorination of HCC-240fa to form HCFC-244fa; (2) conversion of 244fa to a cis/trans mixture of HFO-1234ze; (3) hydrogenation of the cis/trans mixture of 1234ze to form HFC-254fb; and (4) dehydrofluorination of 254fb to produce 3,3,3-trifluoropropene.

Methods to produce 3,3,3-trifluoropropene

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

Preparation method for trifluoroethylene and tetrafluoroethane

The invention discloses a method for catalytic degradation of hexachlorobenzene. The method comprises the following steps: firstly, filling a catalyst into a fixed bed reactor, and carrying out reduction treatment on the catalyst; secondly, mixing hexachlorobenzene steam and preheated hydrogen uniformly to obtain a mixed gas, introducing the mixed gas into the fixed bed reactor after reduction treatment, and carrying out catalytic hydrodechlorination reaction on the catalyst, thereby obtaining the mixed gas of benzene steam, hydrogen chloride gas and unreacted hydrogen; and thirdly, feeding the mixed gas of benzene steam, hydrogen chloride gas and unreacted hydrogen into a condenser for condensing, converting benzene into liquid, then feeding the hydrogen chloride gas and unreacted hydrogen in the mixed gas into an absorption tower for absorbing hydrogen chloride by ammonia water, compressing the unreacted hydrogen by a compressor, and returning for recycling. A solvent is not required to be added in catalytic hydrogenation and degradation of hexachlorobenzene by the method provided by the invention, benzene and ammonium chloride are produced as byproducts, and zero emission of pollutants can be reached, and the method is an environmental-friendly technology for degrading hexachlorobenzene efficiently.

Method for catalytic degradation of hexachlorobenzene

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 method for preparing a high-efficiency Pd/AlF3 catalytic agent used for directionally converting CFC-115 into HFC-125 by hydrogenation and dechlorination. In the invention, noble metal Pd is taken as an active component and self-made AlF3 powder with high specific surface area is taken as a carrier to prepare a load type Pd/AlF3 catalytic agent by adopting an immersion method. The Pd/AlF3 catalytic agent prepared by the method shows high catalytic activity on the reaction of generating HFC-125 by hydrogenating and dechlorinating CFC-115, and the selectivity of the target product is 100 percent.

Preparation and application of catalytic agent used for directionally converting CFC-115 into HFC-125 by hydrogenation and dechlorination

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 provides a gas phase fluorination catalyst and a method for preparing the same. The aim of the invention is to provide a gas phase fluorination catalyst with high activity and stability and a method for preparing the same so as to overcome the defects of poor activity and stability existing in the prior gas phase fluorination catalyst. The catalyst of the invention comprises a carrier and active components, wherein the carrier is a compound of Y, and the active components comprise a compound of chromium and one or more of compounds of magnesium, aluminum, indium, gallium and zinc. The method for preparing the catalyst comprises: according to a certain ratio, the compounds of Y and Cr and one or more of compounds of magnesium, aluminum, indium, gallium and zinc are weighed up, added with water, evenly mixed and added with a precipitator until the precipitation is finished, and the precipitate is separated and the solution washed until the filtrate is neutral, the precipitate is dried, formed and roasted to give the a precursor of the fluorination catalyst, and the precursor of the fluorination catalyst is added with anhydrous HF and treated at a certain temperature to give the gas phase fluorination catalyst.

Gas-phase fluorination catalyst and preparation method thereof

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

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