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Naphtha denitrification adsorbent and preparation method thereof

An adsorbent and naphtha technology, which is applied in the petroleum industry, chemical instruments and methods, and refined hydrocarbon oil, etc., can solve the problems of small adsorption capacity and poor selectivity, and achieve stable adsorption performance, simple preparation method, and adsorption selectivity. high effect

Inactive Publication Date: 2011-04-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the adsorption methods use activated carbon, activated aluminum, silica gel, modified adsorbents, etc. as denitrification agents, but these methods have problems such as poor selectivity and small adsorption capacity.

Method used

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  • Naphtha denitrification adsorbent and preparation method thereof
  • Naphtha denitrification adsorbent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Prepare phosphoric acid with a concentration of 1mol / L as the impregnation solution.

[0029] (2) According to the carrier: impregnating solution = 1:4 (mass ratio), 13X molecular sieve packed in the form of fixed bed is added as an adsorption carrier into corresponding volume of phosphoric acid impregnating solution, and impregnated for 24 hours.

[0030] (3) The primary product of the adsorbent was dried in a constant temperature drier for 3 hours, then placed in a box-type resistance furnace, activated at 300°C for 3 hours, and cooled to room temperature to obtain a denitrification adsorbent.

[0031] The prepared granular acid-carrying 13X molecular sieve adsorbent can remove the organic nitrogen in straight-run naphtha of pipeline transportation crude oil. ppm. The initial adsorption removes organic nitrogen in naphtha, and the oil-to-solvent ratio (mass) can reach 190.3. The adsorbent can be reused after being purged with hot nitrogen gas; after being washed ...

Embodiment 2

[0033] (1) Prepare sulfuric acid with a concentration of 1mol / L as the impregnation solution.

[0034] (2) According to the carrier: impregnation solution = 1:5 (mass ratio), activated alumina packed in the form of a fixed bed is added as an adsorption carrier into a corresponding volume of sulfuric acid impregnation solution, and immersed for 17 hours.

[0035] (3) The primary product of the adsorbent was dried in a constant temperature drier for 4 hours, then placed in a box-type resistance furnace, activated at 200°C for 4 hours, and cooled to room temperature to obtain a denitrification adsorbent.

[0036] The adsorption strength of the obtained adsorbent fully meets the preparation requirements of the present invention through inspection, and the adsorbent can be reused after being purged with hot nitrogen; after being washed with sulfuric acid solvent, the adsorption capacity can be restored to more than 95% of the desorption capacity of the fresh adsorbent.

Embodiment 3

[0038] (1) Prepare nitric acid with a concentration of 1.5mol / L as the dipping solution.

[0039] (2) According to carrier: impregnating liquid = 1:2 (mass ratio), activated carbon packed in the form of fixed bed is added as an adsorption carrier into corresponding volume of sulfuric acid impregnating liquid, and impregnated for 10 hours.

[0040] (3) Put the primary product of the adsorbent in a constant temperature dryer to dry for 2 hours, put it into a box-type resistance furnace, activate it at 200°C for 2 hours, and cool it down to room temperature to obtain the denitrification adsorbent.

[0041] The adsorption strength of the obtained adsorbent fully meets the preparation requirements of the present invention through inspection, and the adsorbent can be reused after being purged with hot nitrogen; after being washed with nitric acid solvent, the adsorption capacity can be restored to more than 95% of the desorption capacity of the fresh adsorbent.

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Abstract

The invention relates to a naphtha denitrification adsorbent which is stable in absorption performance, large in absorption capacity, high in absorption efficiency, high in absorption selectively and renewable and a preparation method thereof. The adsorbent comprises a porous absorption carrier and acidic impregnation liquid loaded on the carrier. The absorbent can deeply remove organic nitride from naphtha by liquid-phase absorption and gas-phase absorption; the nitrogen content in the refined naphtha is less than or equal to 2.5ppm; and with the obvious reduction in the nitrogen content in the naphtha, the influences on the catalyst activity and equipment service life of downstream devices are reduced greatly, and the long-term operation and safe production of the devices are guaranteed.

Description

technical field [0001] The invention relates to the field of refining petroleum products, in particular to an adsorbent for removing nitrogen-containing compounds from naphtha and a preparation method of the adsorbent. Background technique [0002] As the main raw material of catalytic reforming process and steam cracking ethylene production process, naphtha needs to meet the raw material index requirements of reforming unit and ethylene unit. The nitrogen content in naphtha has a significant impact on the catalyst activity and equipment life of the downstream unit, which is not conducive to the long-term operation and safe production of the unit. However, with the deterioration of crude oil and the increase of mining depth, the nitrogen content of crude oil tends to increase, resulting in excessive nitrogen content of naphtha products in atmospheric and vacuum distillation units. How to provide raw materials that meet the quality indicators for subsequent processing units ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/16B01J20/08B01J20/20B01J20/14B01J20/30C10G25/00
Inventor 黄晓华沈本贤产圣刘纪昌姚孝胜李超余世金
Owner CHINA PETROLEUM & CHEM CORP
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