Tlalnepantla, Mexico
Tlalnepantla, Mexico

Mexichem produces and sells of chemicals products worldwide. It was founded in 1998 and located in Tlalnepantla, Mexico. Wikipedia.


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Patent
Mexichem | Date: 2016-08-29

A pharmaceutical solution for a medication delivery apparatus, especially a metered dose inhaler, is described. The pharmaceutical solution comprises: (a) a liquefied propellant component consisting essentially of and preferably consisting entirely of 1,1-difluoroethane (R-152a); (b) ethanol; and (c) a drug component dissolved in the propellant/ethanol mixture consisting of at least one drug selected from the group consisting of beclomethasone dipropionate (BDP) and fluticasone propionate (FP).


Patent
Mexichem | Date: 2016-12-08

A new chromium-containing fluorination catalyst is described. The catalyst comprises an amount of zinc that promotes activity. The zinc is contained in aggregates which have a size across their largest dimension of up to 1 micron. The aggregates are distributed throughout at least the surface region of the catalyst and greater than 40 weight % of the aggregates contain a concentration of zinc that is within 1 weight % of the modal concentration of zinc in those aggregates.


The process for purification of hydrofluoric acid as herein disclosed is able to reduce the content of heavy metals, including arsenic, to values lower than 5 ppm without using any chemicals and with an integrated design of hot and cold streams that provide low energy consumption. Likewise, it achieves the extraction of heavy metals, especially arsenic, with minimal waste generation and maintaining its original oxidation state, which for the case of arsenic is +3, so that the residue can be converted into a product with commercial value, that in this process is obtained as arsenious acid. The process consists of four systems: HF purification system, arsenic concentration system, hot water system, and cold water system. This document discloses the synchronized operation of these 4 systems that together achieve what is mentioned in the previous paragraph.


Patent
Mexichem | Date: 2016-04-05

The invention provides a heat transfer composition comprising (i) a first component selected from trans-1,3,3,3-tetrafluoropropene (R-1234ze(E)), cis-1,3,3,3-tetrafluoropropene (R-1234ze(Z)) and mixtures thereof; (ii) carbon dioxide (R-744); and (iii) a third component selected from difluoromethane (R-32) 1,1,1,2-tetrafluoroethane (R-134a) and mixtures thereof.


Patent
Mexichem | Date: 2015-12-09

The invention relates to a process for removing one or more undesired (hydro)halocarbon compounds containing a =CHF or a =CF_(2) moiety from a desired (hydro)fluoroalkene which does not contain a =CF_(2) moiety, the process comprising contacting a composition comprising the desired (hydro)fluoroalkene and one or more undesired (hydro)halocarbon compounds with an aluminium-containing adsorbent, activated carbon, or a mixture thereof.


1. The invention provides a process for the preparation of 2,3,3,3-tetrafluoropropene (1234yf), the process 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;wherein the process is carried out in a semi-batch manner using one hydrogenation reactor and one dehydrofluorination reactor, wherein steps (a), (b), (c) and (d) are conducted sequentially in that order.


Patent
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.


Patent
Mexichem | Date: 2016-09-20

A pharmaceutical solution for a medication delivery apparatus, especially a metered dose inhaler, is described. The pharmaceutical solution comprises: (a) a liquefied propellant component consisting essentially of and preferably consisting entirely of 1,1-difluoroethane (R-152a); (b) ethanol; and (c) a drug component dissolved in the propellant/ethanol mixture consisting of at least one drug selected from the group consisting of beclomethasone dipropionate (BDP) and fluticasone propionate (FP).


The present invention provides a process for preparing 2,3,3,3-tetrafluoropropene (CF_(3)CF=CH_(2)), which process comprises dehydrohalogenating 1,1,1,2,2-pentafluoropropane (CH_(3)CF_(2)CF_(3), HFC-245ca), 1,1,1,2-tetrafluoro-2-chloropropane, 1,1,1,2,3-pentafluoropropane (CH_(2)FCHFCF_(3), HFC-245eb) and/or 1,1,1,2-tetrafluoro-3-chloropropane in the presence of a base, the process further comprising the step of converting a trifluorodichloropropane or a difluorotrichloropropane or a fluorotetrachloropropane to CH_(3)CF_(2)CF_(3), 1,1,1,2-tetrafluoro-2-chloropropane, CH_(2)FCHFCF_(3), and/or 1,1,1,2-tetrafluoro-3-chloropropane.


The invention provides a process for the preparation of 2,3,3,3-tetrafluoropropene (1234yf), the process 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,wherein steps (a) and/or (c) is carried out with a diluent gas stream that comprises an excess of one or both of the feedstocks 1216 and/or 1225ye, respectively.

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