US 5,473,084 A · Chlorination process with high para selectivity

Abstract

A heterogeneous catalytic chlorination process for making chlorinated aromatic compounds with high para-selectivity. Examples of chlorinated aromatic compounds that can be prepared using the process disclosed in the present invention include those compounds represented by the following formula: ##STR1## wherein R can be a C1-C3 alkyl, floride, chloride, bromide, iodide, or hydroxyl group. The chlorination process utilizes a de-aluminated zeolite which is prepared by H.sub.4 EDTA or Na.sub.4 EDTA extraction of L-type zeolite to reduce the alumina content thereof. The SiO.sub.2 /Al.sub.2 O.sub.3 ratio of the de-aluminated zeolite is preferably between about 9 and about 40. The de-aluminated zeolite can be ion-exchanged with Group IA or IIA metal ions to further improve its para-selectivity.

Claims16

Dependent claims

A high para-selectivity chlorination process for chlorinating aromatic reactant comprising the steps of:

(a) obtaining a chlorination reactor containing a catalyst composition which comprises a de-aluminated zeolite, said de-aluminated zeolite catalyst having a SiO.sub.2 /Al.sub.2 O.sub.3 ratio of between 9/1 to 40/1;
and
(b) feeding said aromatic reactants and chlorine gas into said reactor to effect said chlorination process to produce chlorinated aromatic products;
wherein said aromatic reactant is either toluene or chloro-benzene, and said de-aluminated zeolite is an L-type zeolite that has been treated by a de-aluminating process to reduce aluminate content thereof;
(c) further wherein said de-aluminating process comprises a SiCl.sub.4 chemical vapor deposition step to reduce said aluminate content of said L-type zeolite.

2 more elements

Dependencies are inferred from the claim text.

Chlorination process with high para selectivity

Life of this patent

Chlorination process with high para selectivity

Life of this patent

Abstract

Claims16