Method for pre-hydrotreating and purifying waste lubricating oil

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United States of America

PATENT NO 12173252
APP PUB NO 20230416636A1
SERIAL NO

18036199

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Abstract

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The present invention relates to a pre-hydrotreatment and purification method for waste lubricating oil, the method comprising the following steps: mechanical impurities are removed from waste lubricating oil, and then the oil is subjected to flash distillation to separate free water and a portion of light hydrocarbons; a bottom product of the flash distillation column is mixed with hydrogen and a self-sulfurizing oil-soluble transition metal catalyst, and then enters a slurry bed reactor for pre-hydrotreatment; a gas product obtained by performing separation on a reaction effluent is subjected to adsorption purification and then enters a hydrogen recycle compressor for cyclic use; a liquid product obtained by performing separation on a reaction effluent is subjected to hydrocyclone separation and solvent washing to remove solid residue, and finally a purified lubricating oil component is obtained. The method of the present invention has such advantages as simple processing procedures, a high non-ideal component conversion rate, a high oil liquid yield, and good quality. In addition, the oil-soluble catalyst features simple dispersion, no need for vulcanization, a small catalyst adding amount, high low-temperature hydrogenation activity, and is capable of effectively preventing the coking that could occur during a process of preheating the waste lubricating oil, markedly extending the operational lifespan of a waste lubricating oil hydrogen treatment device.

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Patent Owner(s)

Patent OwnerAddress
CHINA UNIVERSITY OF PETROLEUM (EAST CHINA)257061 NO TWO 271 NORTH ROAD DONGYING DISTRICT SHANDONG DONGYING DONGYING CITY SHANDONG PROVINCE 257061

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Chai, Yongming Qingdao, CN 2 0
Li, Yichuan Qingdao, CN 3 0
Liu, Bin Qingdao, CN 1027 7414
Liu, Chenguang Qingdao, CN 76 781
Liu, Yunqi Qingdao, CN 21 48
Pan, Yuan Qingdao, CN 12 73
Zhang, Kongyuan Qingdao, CN 2 0

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