24/06/2005 - Controller General of Patents, Designs, and Trade Marks

(21) Application No. 2874/DEL/1998 A (22) Date of filing of Application: 25/09/1998
(54) Title of the invention: “A PROCESS FOR THE PRODUCTION OF NITROARENES WITH
HIGH PARA-SELECTIVITY FROM MONOSUBSTITUTED
AROMATIC HYDROCARBONS USING ALUMINOSILICATES AS
CATALYSTS.”
(51) International Classification 7 :
C 07C 201/08, 205/12, 205/06, 205/37
(30) Priority Data :
(31) Document No.: NA
(32) Date : NA
(33) Name of convention country : NA
(66) Filed U/s 5(2) : NIL
(61) Patent of addition to application No. : NA
(62) Filed on : NA
(63) Divisional to Application No. :NIL
(64) Filed on : NA
Total No. of Pages:
(57) Abstract:
(71) Name of the applicant:
COUNCIL OF SCIENTIFIC AND
INDUSTRIAL RESEARCH.
Address of the Applicant:
Rafi Marg, New Delhi – 110 001, India.
(72) Name of the Inventor:
BOYAPATI MANORANJAN
CHOUDARY
MUTYALA SATEESH
MANNEPALLI LAKSHMI KANTAM
KOTTAPALLI KOTESWARA RAO
KOMPELLA VISHWESHWAR RAM
PRASAD
KONDAPURAM VIJAYA RAGHAVAN
The present invention provides a process for the production of nitroarenes with high para
selectivity from monosubstituted aromatic hydrocarbons using aluminosilicate as catalysts, which
comprises nitration of monosubstiututed aromatic hydrocarbons using beta zeolite of different si/al
ratio ranging between 5 to 1000 as catalyst with nitric acid in the molar ratio of 0.25 to 2.5 at a
temperature ranging between 30-1600c for a period ranging between 0.25 to 3.0 h and followed by
continuous removal of water formed from the reaction mixture with a dear-stark apparatus and
recovery of the product mixture by concentration of the reaction mixture after separation of the
catalyst by filtration. The process is useful for the production of many large volume chemicals
such as nitrotoluene, nitrochlorobenzene and others as vital intermediate for dyes, drugs and
pesticides.
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