摘要:
The present invention relates to a process for simultaneously producing purified streams of 1,1,2,3-tetrachloropropene and 1,1,1,2,3-pentachloropropane, the process comprising: a. providing a crude product stream containing 1,1,1,2,3-pentachloropropane, where the crude product stream includes ferric chloride; and b. subjecting the crude product stream to reactive distillation at a pressure sufficient to convert a portion of the 1,1,1,2,3-pentachloropropane within the crude to 1,1,2,3-tetrachloropropene while simultaneously forming a volatiles fraction including the 1,1,1,2,3-pentachloropropane and 1,1,2,3-tetrachloropropene, where the volatiles fraction is substantially free of ferric chloride.
摘要:
The present invention is a method for 2-fluorobutane to obtain highly purified 2-fluorobutane through a process comprising a step for: bringing crude 2-fluorobutane that includes 5 to 50 wt% of butene into contact with a brominating agent that can form a bromonium ion in an aprotic polar solvent in the presence of water or an alcohol having up to 4 carbon atoms; converting the butene into compounds having a boiling point higher than that of 2-fluorobutane. then recovering 2-fluorbutane from the reaction solution; and purifying the recovered 2-fluorabutane by distillation.
摘要:
The present invention discloses a manufacturing process to produce high purity 1234yf from 245eb, which includes the removal of impurities present in 245eb raw material, the dehydrofluorination of 245eb, and the removal of impurities present in final crude product. The disclosed manufacturing process allows one to lower the levels of undesired 1225ye and trifluoropropyne in the final 1234yf product below 500, and 50 ppm, respectively.
摘要:
This disclosure relates to processes which involve: contacting a mixture comprising at least one fluoroolefin and at least one alkyne impurity with at least one zeolite to reduce the concentration of the at least one alkyne impurity in the mixture; wherein Rf is a straight-chain perfluorinated alkyl group, and X is H, F, Cl, Br or I; and the at least one zeolite is selected from the group consisting of zeolites having pore opening of at least 4 Angstroms and no more than about 5 Angstroms, zeolites having pore opening of at least about 5 Angstroms and Sanderson electronegativity of no more than about 2.6, and mixtures thereof; provided that the at least one zeolite is not zeolite 4A. This disclosure also relates to processes for making at least one hydrotetrafluoropropene product selected from the group consisting of CF3CF=CH2, CF3CH=CHF, and mixtures thereof; and relates to processes for making at least one hydrochlorotrifluoropropene product selected from the group consisting of CF3CCl=CH2, CF3CH=CHCl, and mixtures thereof.
摘要:
A method for forming 2,3,3,3-tetrafluoropropene (HFO-1234yf) comprising providing a dehydrochlorination starting material having relatively low concentrations of 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf), especially and preferable less than about 8.0% when the dehydrochlorination reaction utilizes no substantial amount of catalyst or catalyst comprising austenitic nickel-based materials.
摘要:
Disclosed is an integrated manufacturing process to co-produce (E) 1-chloro-3,3,3-trifluoropropene, (E) 1,3,3,3-tetrafluoropropene, and 1,1,1,3,3-pentafluoro-propane starting from a single starting feed material or a mixture of unsaturated hydrochlorocarbon feed materials comprising 1,1,1,3-tetrachloropropene and/or 1,1,3,3-tetrachloropropene. The process includes a combined liquid or vapor phase reaction/purification operation which directly produces (E) 1-chloro-3,3,3-trifluoro-propene (1233zd (E)) from these feed materials, which may also include 240fa. In the second liquid phase fluorination reactor 1233zd (E) is contacted with HF in the presence of catalyst to produce 1,1,1,3,3-pentafluoropropane (245fa) with high conversion and selectivity. A third reactor is used for dehydrofluorination of 245fa to produce (E) 1,3,3,3-tetrafluoropropene (1234ze (E)) by contacting in the liquid phase with a caustic solution or in the vapor phase using a dehydrofluorination catalyst. This operation may be followed by one or more purification processes to recover the 1234ze (E) product.
摘要:
The present invention relates to a method for purifying a compound selected from a compound represented by the following general formula [1] or [2], a saturated aliphatic hydrocarbon having no substituent, or kerosene: (R represents a halogen atom or a lower alkyl group having 1 to 3 carbon atoms, and n represents an integer of 1 to 5); (R is the same as above, p and q independently represent an integer of 0 to 4, with the proviso that at least one ofp and q is not 0), comprising: removing a impurity contained in said compound by a first step comprising contacting said compound with ozone gas, and then a second step comprising contacting said compound with an adsorbent selected from zeolite or a basic adsorbent.
摘要:
Describes a method for recovering trans-1,2-dichloroethene from a liquid feed composition comprising both the cis- and trans- isomers of 1,2-dichloroethene and contaminating amounts of other chlorinated hydrocarbons, e.g., lower alkyl chlorinated hydrocarbons, such as C?1#191-C?2#191 chlorinated hydrocaarbons. In one of the described methods, the liquid feed composition is introduced into a first distillation column 10 wherein the stereoisomers and chlorinated hydrocarbons more volatile than the stereoisomers are removed as overhead 12 and charged to a second distillation column 20. In column 20, the stereoisomers are separated from the more volatile chlorinated hydrocarbons, and a bottoms fraction 24 comprising the stereoisomers are charged to a reaction distillation column 30 wherein the cis- isomer, is isomerized to the trans- isomer in the liquid phase and in the presence of an organic free-radical initiator, e.g., an azonitrile initiator. Substantially pure trans-1,2-dichloroethene is recovered as overhead 32 from reaction distillation column 30.