Process for regeneration of titano silicate catalyst
First Claim
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1. A process for activating a deactivated titano silicate catalyst, in a reactor, said process comprising the following steps;
- i) washing the catalyst bed containing deactivated titano silicate at a temperature range of 20 to 40°
C., with a solvent selected from the group consisting of alcohol, ester, ketone, water and aqueous hydrogen peroxide;
ii) heating the reactor to a temperature in the range of 50°
C. to 100°
C., to provide a heated catalyst bed;
iii) reacting the heated catalyst in the catalyst bed, with ozone gas under exothermic conditions, said reaction being carried out by feeding a gaseous mixture containing air/oxygen and ozone having ozone content in the range of 2 to 10%, and monitoring the outlet stream of the gas coming out through said bed for ozone seepage, said reaction continued till the ozone content in the outlet stream is at least 0.2%, to provide a regenerated catalyst; and
iv) cooling the regenerated catalyst bed first by passing of air/oxygen gas through the said bed followed by washing of the said bed with a solvent selected from the group consisting of alcohol and water, to a temperature in the range of 20 to 40°
C.
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Abstract
Titanosilicate catalyst is used in the oxidation reactions such as allylchloride epoxidation, phenol hydroxylation, Cyclohexanone ammoximation. During the reaction the catalyst is deactivated which further decrease in the efficiency of the oxidation reactions. The present invention provides a method for an efficient regeneration of catalyst titanosilicate catalyst at low temperature below 100° C. using a gaseous mixture containing ozone, without isolating the catalyst from the reactor system.
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14 Claims
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1. A process for activating a deactivated titano silicate catalyst, in a reactor, said process comprising the following steps;
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i) washing the catalyst bed containing deactivated titano silicate at a temperature range of 20 to 40°
C., with a solvent selected from the group consisting of alcohol, ester, ketone, water and aqueous hydrogen peroxide;ii) heating the reactor to a temperature in the range of 50°
C. to 100°
C., to provide a heated catalyst bed;iii) reacting the heated catalyst in the catalyst bed, with ozone gas under exothermic conditions, said reaction being carried out by feeding a gaseous mixture containing air/oxygen and ozone having ozone content in the range of 2 to 10%, and monitoring the outlet stream of the gas coming out through said bed for ozone seepage, said reaction continued till the ozone content in the outlet stream is at least 0.2%, to provide a regenerated catalyst; and iv) cooling the regenerated catalyst bed first by passing of air/oxygen gas through the said bed followed by washing of the said bed with a solvent selected from the group consisting of alcohol and water, to a temperature in the range of 20 to 40°
C. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification