公开(公告)号：US3535301A

公开(公告)日：1970-10-20

申请号：US3535301D

申请日：1967-12-11

Applicant: MONTEDISON SPA

Inventor： GROPPELLI GIOVANNI ,  CARCANO DONATO ,  RAGAZZINI MARIO ,  GOZZO FRANCO

IPC: C08F14/26 ,  C08F283/06 ,  C08F3/20

CPC classification number: C08F14/26 ,  C08F283/06 ,  C08F2/16 ,  C08F214/26

公开(公告)号：US3650987A

公开(公告)日：1972-03-21

申请号：US3650987D

申请日：1969-07-18

Applicant: MONTEDISON SPA

Inventor： VECCHIO MARTINO ,  GROPPELLI GIOVANNI ,  FATTORE VITTORIO

IPC: B01J27/06 ,  B01J27/12 ,  B01J27/125 ,  C07B61/00 ,  C07C17/00 ,  C07C17/02 ,  C07C17/04 ,  C07C17/08 ,  C07C17/20 ,  C07C17/37 ,  C07C19/12 ,  C07C67/00 ,  B01J11/78

CPC classification number: C07C17/04 ,  B01J27/06 ,  C07C17/02 ,  C07C17/206 ,  C07C17/37 ,  Y02P20/582 ,  C07C19/08 ,  C07C19/12

Abstract: A CATALYST IS DISCLOSED FOR THE PREPARATION OF FLUORINATED HYDROCARBONS VIA FLUORINATION OF CHLOROFLUORINATION REACTIONS IN GASEOUS PHASE, THE CATALYST CONSISTING ESSENTIALLY OF ALUMINUM FLUORIDE CONTAINING MINOR, QUANTITIES OF IRON, CHROMIUM, AND PREFERABLY ALSO NICKEL COMPOUNDS, PRESENT IN QUANTITIES CORRESPONDING TO THE FOLLOWING PRECENTAGES BY WEIGHT OF THE METAL (BASED ON THE TOTAL): FROM 0.1% TO 5% OF FE, FROM 0.05% TO 8.5% AT LEAST PARTIALLY, IN THE FORM OF HALIDES, AND IN PARTICULAR FLUORIDES, OR IN THE FORM OF OXIDES OR OXY-HALIDES. THE CATALYST IS PREPARED BY ADDING IRON OR CHROMIUM COMPOUNDS, AND PREFERABLY ALSO NICKEL COMPOUNDS, IN A SUBDIVIDED FORM, TO ALUMINUM FLUORIDE OR ALUMINA, AND THEN SUBJECTING THE COMPOSITION THUS OBTAINED TO AN ACTIVATION TREATMENT BY HEATING AT A TEMPERATURE BETWEEN 300*C. AND 550*C. FOR FROM 0.5-4 HOURS IN A CURRENT OF NITROGEN OR AIR, AND THEN SUBJECTING SAID COMPOSITION TO A FLUORINATION TREATMENT BY HEATING AT 200*-500*C. IN AN HF CURRENT, SIUTABLY DILUTED WITH INERT GASES FOR THE THERMAL CONTROL OF THE REACTION, IN ORDER TO CONVERT, AT LEAST PARTIALLY, THE ALUMINA AND POSSIBLY ALSO THE OTHER METAL COMPOUNDS INTO THEIR RESPECTIVE FLUORIDE. THE CATALYST THUS OBATAINED IS IMPLOYED FOR THE FLUORINATION IN GASEOUS PHASE AT ELEVATED TEMPERATURES OF HALOGENATED ETHANES CONTAINING AT LEAST ONE CHLORINE ATOM, IN ORDER TO OBTAIN HIGH YIELDS IN FUORINATED ETHANES HAVING A HIGH DEGREE OF SYMMETRY, BY MEANS OF HF, OR FOR THE CHLOROFLUORINATION IN GASEOUS PHASE AT ELEVATED TEMPERATURES OF ETHYLENE OR PARTIALLY HALOGENATED ETHYLENES BY MEANS OF A MIXTURE OF HF+CL2, IN ORDER TO OBTAIN FLUORINATED OR CHLOROFLUORINATED ETHANES WITH A HIGH DEGREE OF SYMMETRY.

公开(公告)号：US3668167A

公开(公告)日：1972-06-06

申请号：US3668167D

申请日：1969-12-01

Applicant: MONTEDISON SPA

Inventor： RAGAZZINI MARIO ,  CAIMI ALBERTO ,  CARCANO DONATO ,  GROPPELLI GIOVANNI

IPC: C08F6/20 ,  C08J3/02 ,  C08L27/18 ,  C08F45/24

CPC classification number: C08J3/02 ,  C08F6/20 ,  C08J2327/18 ,  C08L27/18

Abstract: A process for the concentration of aqueous polytetrafluoroethylene emulsions comprising forming atop the emulsion to be concentrated a layer of water absorbing agent, maintaining the resultant two layers in contact with each other until absorption of water from the emulsion by the said water absorbing agent has proceeded to a desired degree, separating the said layers, and thence recovering the aqueous polytetrafluoroethylene emulsion thus concentrated. The water absorbing agent can be any one of a number of water soluble organic liquid or solid water absorbing agents having a density less than that of the emulsions to be concentrated.

Abstract translation: 一种浓缩聚四氟乙烯水乳液的方法，包括在所述乳液上形成浓缩一层吸水剂，保持所得的两层彼此接触，直到所述吸水剂从乳液中吸收水已经进行到 期望的程度，分离所述层，然后回收如此浓缩的聚四氟乙烯水乳液。 吸水剂可以是密度小于待浓缩乳液密度的多种水溶性有机液体或固体吸收剂中的任何一种。