Two mathods to make chlorobenzene
Answers
1. A method for the production of chlorobenzene, which comprises contacting a gaseous flow comprising benzene, oxygen and a halogenating agent selected from the group consisting of hydrogen chloride and mixtures of the latter with chlorine and/or chloral, at a temperature of from 190° to 230° C., with a fluidized catalyst comprising copper chloride deposited on a granular support, the support consisting essentially of alumina in the crystallographic form eta, having a total volume of pores of from 0.3 to 0.5 ml/g with at least 90% of the said volume attributable to pores with a radius of less than 40 A, and a surface area of from 250 to 400 m2 /g with at least 90% of the said surface area attributable to pores with a radius of less than 30 A, these values being determined according to the B.E.T. method by absorption of nitrogen at liquid nitrogen temperature.
2. The method of claim 1, in which said gaseous flow contains from 0.1 to 0.5 chlorine atoms, contained in the halogenating agent, for each mole of benzene and from 0.4 to 0.6 moles of oxygen for each of said chlorine atoms.
3. The method of claim 1, wherein said gaseous flow is contacted with said catalyst at a pressure of from 1 to 3 Atmospheres.
4. The method of claim 1, wherein said gaseous flow is contacted with said catalyst at a temperature of from 200° to 220° C.
5. The method of claim 1, wherein the residence time of the gaseous flow under the reaction conditions is from 25 to 45 seconds.
6. The method of claim 1, wherein said eta alumina has a total volume of pores of 0.4 ml/g with at least 90% of said volume attributable to pores with a radius of less than 30 A, and a surface area of about 350 m2 /g with at least 90% of said area attributable to pores with a radius of less than 20 A.
7. The method of claim 1, wherein said alumina is in the form of granules of from 20 to 100 microns in size.
8. The method of claim 1, wherein said catalyst contains from 2 to 8% by weight of copper calculated as metal.
The present invention relates to the production of chlorobenzene by oxychlorination of benzene.