Process for production of hexafluoropropene optionally other halogenated hydrocarbons containing fluorine

• Main Authors: F.J. WALCZAK, A.C. SIEVERT, V.N.M. RAO
• Format: Patent
• Language: Chinese; English
• Published: 08.12.2004
• Edition: 7
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMISTRY; METALLURGY; ORGANIC CHEMISTRY

公开了一种CF#-[3]CF＝CF#-[2]和任选地至少一种选自CF#-[3]CH#-[2]CF#-[3]和CF#-[3]CHFCHF#-[2]化合物的制备方法。本方法包括使含有至少一种通式CX#-[3]CH#-[2]CH#-[y]X#-[(3-y)]所示的卤代丙烷和/或通式CX#-[3]CH＝CH#-[y]X#-[(2-y)]所示的卤代丙烯(其中X是Cl或F和y是0，1或2)的前体流的反应器进料(假定前体流的平均氟含量每分子中不多于5个氟取代基)在含有氟化催化剂且操作温度在约150℃和400℃之间的氯氟化反应区中同HF和Cl#-[2]接触产生含有HF，HCl和所说前体流反应产物混合物的反应区流出液，其中含有至少一种通式C#-[3]Cl#-[2]F#-[2]包括CClF#-[2]CClFCF#-[3]所示化合物和至少一种通式C#-[3]HClF#-[6]包括CHF#-[2]CClFCF#-[3]所示的化合物并且氟平均含量至少每分子中比前体流的平均氟含量多一个氟取代基。氯氟化反应区流出液蒸馏得到(i)含有HCl(和当它们在反应区中流出液存在时C#-[3]F#-[8]，C#-[3]ClF#-[7]和C#-[3]HF#-[7])的低沸点组分，(ii)含有至少一种通式C#-[3]Cl#-[2]F#-[6]包括CClF#-[2]CClFCF#-[3]所示的化合物和至少一种通式C#-[3]HClF#-[6]包括CHF#-[2]CClFCF#-[3]所示的化合物的氢化进料组分，和(iii)包含含有至少一个氯取代基和从1到5个氟取代基的卤代丙烷的未充分氟化的组分，氢化进料组分(ii)的CClF#-[2]CClFCF#-[3]和CHF#-[2]CClFCF#-[3]和氢气反应制备含有CF#-[3]CF＝CF#-[2]和CF#-[3]CHCFCHF#-[2]的混合物且回收从本产品混合物得到的CF#-[3]CF＝CF#-[2]。使未充分氟化的组分(iii)回到氯氟化反应区。 A process is disclosed for the manufacture of CF3CF=CF2, and optionally a least one compound selected from CF3CH2CF3 and CF3CHFCHF2. The process involves contacting a reactor feed including a precursor stream of at least one halogenated propane of the formula CX3CH2CHyX(3-y) and/or halogenated propene of the formula CX3CH=CHyX(2-y), where each X is Cl or F and y is 0, 1 or 2 (provided that the average fluorine content of the precursor stream is no more than 5 fluorine substituents per molecule) with HF and Cl2 in a chlorofluorination reaction zone containing a fluorination catalyst and operating at a temperature between about 150° C. and 400° C., to produce a reaction zone effluent including HF, HCl and a mixture of reaction products of the precursor feed which contains at least one compound of the formula C3Cl2F6 including CClF2CClFCF3 and at least one compound of the formula C3HClF6, including CHF2CClFCF3 and has an average fluorine content which is at least one fluorine substituent per molecule more than the average fluorine content of the precursor stream. The chlorofluorination reaction zone effluent is distilled to produce (i) a low-boiling component including HCl (and when they are present in the reaction zone effluent, C3F8, C3ClF7 and C3HF7), (ii) a hydrogenation feed component containing at least one compo of the formula C3Cl2F6 including CClF2CClFCF3 and at least one compound of the formnula C3HClF6 including CHF2CClFCF3, and an underfluorinated component including halogenated propanes containing at least one chlorine subtituent and from one to five fluorine substituents. The CClF2CClFCF3 and CHF2CClFCF3 of hydrogenation feed component (ii) is reacted with hydrogen to produce a mixture including CF3CF=CF2 and CF3CHFCHF2 and the CF3CF=CF2 from this p