Mexichem | Date: 2016-01-04
The invention relates to a process for removing one or more undesired (hydro)halocarbon compounds from a (hydro)fluoroalkene, the process comprising contacting a composition comprising the (hydro)fluoroalkene and one or more undesired (hydro)halocarbon compounds with an aluminium-containing absorbent, activated carbon, or a mixture thereof.
Mexichem | Date: 2014-04-17
A pharmaceutical composition is described that is suitable for delivery from a pressurised container. The composition is preferably free of polar excipients and comprises: (a) a propellant component that consists essentially of 1,1-difluoroethane (R-152a); (b) a surfactant component that comprises at least one surfactant compound other than oleic acid; and (c) a drug component that consists of salbutamol sulphate. The pharmaceutical composition can be delivered using a metered dose inhaler (MDI).
Mexichem | Date: 2014-04-23
A process for treating a composition comprising one or more desired (hydro)halocarbons and one or more undesired halogenated hydrocarbon containing impurities so as to reduce the concentration of at least one undesired halogenated hydrocarbon containing impurity, the process comprising contacting the composition with an adsorbent comprising a carbon molecular sieve.
Mexichem | Date: 2015-07-13
The invention provides a heat transfer composition consisting essentially of from about 60 to about 85% by weight of trans-1,3,3,3-tetrafluoropropene (R-1234ze(E)) and from about 15 to about 40% by weight of fluoroethane (R-161). The invention also provides a heat transfer composition comprising R-1234ze(E), R-161 and 1,1,1,2-tetrafluoroethane (R-134a).
Mexichem | Date: 2015-10-06
The invention provides a process for the preparation of 1234yf comprising (a) contacting 1,1,2,3,3,3-hexafluoropropene (1216) with hydrogen in the presence of a hydrogenation catalyst to produce 1,1,2,3,3,3-hexafluoropropane (236ea); (b) dehydrofluorinating 236ea to produce 1,2,3,3,3-pentafluoropropene (1225ye); (c) contacting 1225ye with hydrogen in the presence of a hydrogenation catalyst to produce 1,2,3,3,3-pentafluoropropane (245eb); and (d) dehydrofluorinating 245eb to produce 1234yf.