	US 12,264,117 B2
	Catalytic process for the production of aromatic hydrocarbons from used cooking oil
Bipul Sarkar, Uttarakhand (IN); Om Vir Singh, Uttarakhand (IN); Ankit Agrawal, Uttarakhand (IN); Anjan Ray, Uttarakhand (IN); Sanat Kumar, Uttarakhand (IN); Bhanu Prasad Vempatapu, Uttarakhand (IN); and Jagdish Kumar, Uttarakhand (IN)
Assigned to COUNCIL OF SCIENTIFIC AND INDUSTRIAL RESEARCH AN INDIAN REGISTERED BODY INCORPORATED UNDER THE REGN. OF SOC. ACT (ACT XXI OF 1860), New Delhi (IN)
Filed by COUNCIL OF SCIENTIFIC AND INDUSTRIAL RESEARCH AN INDIAN REGISTERED BODY INCORPORATED, Delhi (IN)
Filed on Jul. 19, 2023, as Appl. No. 18/355,160.
Claims priority of application No. 202211041939 (IN), filed on Jul. 21, 2022.
Prior Publication US 2024/0025820 A1, Jan. 25, 2024
Int. Cl. C07C 1/20 (2006.01); B01J 37/03 (2006.01); B01J 37/08 (2006.01); C07C 1/207 (2006.01)

CPC C07C 1/2078 (2013.01) [B01J 37/035 (2013.01); B01J 37/086 (2013.01); C07C 2529/40 (2013.01); C07C 2529/46 (2013.01)]

4 Claims

1. A process for the preparation of aromatic hydrocarbons by aromatisation from used cooking oil using a polymetallic alumina-silicate zeolite catalyst comprising the steps of:

a) synthesizing the Zn-X-MFI catalyst by adding nitrate/chloride salts or acids of elements selected from the group consisting of Zn, Co, Ga, Cr, Fe, Ce and B, to CTAB dissolved in water followed by heating at 70° C. to obtain a mixture, wherein the weight ratio of X to MFI is kept in a range of 3 to 6% and the weight ratio of Zn to MFI is kept in a range of 6 to 10%, wherein X is selected from Co, Ga, Cr, Fe, Ce, B, and combinations thereof;

b) homogenizing the mixture obtained in step (a) followed by heating at a temperature in a range of 50 to 80° C. under stirring for 1 h to obtain a homogenized mixture;

c) successively adding 1 to 10 wt % of a nano porous MFI zeolite to the homogenized mixture obtained in step [b] under stirring for 12-16 h at a temperature in a range of 50 to 80° C., to obtain a precipitate;

d) cooling the precipitate obtained in step [c] to room temperature naturally, followed by collecting and washing with ethanol and water several times to obtain a material;

e) calcining the material obtained in step [d] at 350 to 550° C. for 4-6 h in air to obtain the catalyst;

f) aromatising a used cooking oil [UCO] in a fixed bed down-flow reactor with the Zn-X-MFI catalyst obtained in step [e] in the absence or presence of 1-5% nitrogen or steam while maintaining the reactor at atmospheric pressure at a temperature in a range of 250-550° C. with a gas hourly space velocity (GHSV) in a range of 600-1800 h⁻¹and liquid hour space velocity (LHSV) in a range of 1.5-2.5 h⁻¹to obtain reaction products comprising aromatics.