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Method for removing trace olefin from aromatic hydrocarbon filled with solid catalyst combination

A solid catalyst and catalyst technology, applied in the petrochemical field, can solve the problems of the production impact of white clay dismantling and reinstallation, the small specific surface area of ​​the white clay, and the short service cycle, and achieve the effects of avoiding solid waste, low bromine index and small environmental impact.

Pending Publication Date: 2021-10-12
NINGBO ZHONGJIN PETROCHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the specific surface area of ​​clay is small, it is easy to absorb and saturate, the service life is short, and it needs to be replaced frequently
Moreover, due to the non-renewable nature of the white clay structure, landfill treatment is generally used, which causes serious pollution to the environment
In addition, the demolition and reinstallation of white clay will also have a certain impact on production

Method used

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  • Method for removing trace olefin from aromatic hydrocarbon filled with solid catalyst combination

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Take an appropriate amount of white clay, use nitric acid and hydrochloric acid (molar ratio 1:1), and treat it for 4 hours under the conditions of a liquid-solid ratio of 5 and a pickling temperature of 90°C. Catalyst A was obtained after suction filtration, washing, drying, roasting and other steps. Take an appropriate amount of Y molecular sieve catalyst, use hydrochloric acid and citric acid (molar ratio 1:2), and treat for 4 hours under the conditions of liquid-solid ratio of 4 and pickling temperature of 95°C. Catalyst B was obtained after suction filtration, washing, drying, roasting and other steps.

[0038] Fill the bottom of the reaction tube with an appropriate amount of inert glass beads, then weigh 10 grams of catalyst B, put it into the reaction tube, then fill it with inert glass beads at a height of 4 cm, then weigh 2 g of catalyst A, and finally fill the upper part with an appropriate amount of inert glass beads. After nitrogen purging at 350 °C for 3 ...

Embodiment 2

[0040]Take an appropriate amount of white clay, use phosphoric acid and hydrochloric acid (molar ratio 1:1), and treat it for 4 hours under the conditions of a liquid-solid ratio of 5 and a pickling temperature of 90°C. Catalyst A was obtained after suction filtration, washing, drying, roasting and other steps. Take an appropriate amount of Y molecular sieve catalyst, use phosphoric acid and citric acid (molar ratio 1:2), and treat for 4 hours under the conditions of liquid-solid ratio of 4 and pickling temperature of 95°C. Catalyst B was obtained after suction filtration, washing, drying, roasting and other steps.

[0041] Fill the bottom of the reaction tube with inert glass beads of a certain height, then weigh 10 grams of catalyst B, put it into the reaction tube, then fill in the inert glass beads at a height of 4 cm, then weigh 5 g of catalyst A, and finally fill the upper part with an appropriate amount of inert glass beads . After nitrogen purging at 350 °C for 4 h, ...

Embodiment 3

[0043] Take an appropriate amount of white clay, use phosphoric acid and hydrochloric acid (molar ratio 1:1), and treat it for 4 hours under the conditions of a liquid-solid ratio of 5 and a pickling temperature of 90°C. Catalyst A was obtained after suction filtration, washing, drying, roasting and other steps. Take an appropriate amount of Y molecular sieve catalyst, use phosphoric acid and citric acid (molar ratio 1:2), and treat for 4 hours under the conditions of liquid-solid ratio of 4 and pickling temperature of 95°C. Catalyst B was obtained after suction filtration, washing, drying, roasting and other steps.

[0044] Fill a certain height of inert glass beads at the bottom of the reaction tube, then weigh 10 grams of Catalyst B, put it into the reaction tube, then fill it with inert glass beads at a height of 4 cm, then weigh 10 g of Catalyst A, and finally fill the upper part with an appropriate amount of inert glass beads . After nitrogen purging at 350 °C for 4 h,...

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Abstract

The invention relates to the field of petrifaction, and discloses a method for removing trace olefin from aromatic hydrocarbon filled with a solid catalyst combination, which comprises the following steps: placing an aromatic hydrocarbon raw material in an olefin removal reactor, respectively passing through two sections of reaction zones from top to bottom under the conditions of temperature and pressure, wherein the two reaction zones are respectively filled with a catalyst A and a catalyst B according to the flowing direction of the aromatic hydrocarbon raw material, the catalyst A is a modified clay adsorbent, and the catalyst B is a modified Y molecular sieve catalyst; removing olefin from the aromatic hydrocarbon raw material through chemical adsorption and catalytic reaction. According to the method, the advantages of the two different catalysts are fully utilized, the activity and efficiency of the whole system for removing olefin from aromatic hydrocarbon are improved through the synergistic effect, the bromine index of a reaction product is reduced through the combined adsorption and reaction method, and the service life of the catalyst is greatly prolonged.

Description

technical field [0001] The invention relates to the field of petrochemicals, in particular to a method for removing trace olefins from aromatic hydrocarbons loaded with a solid catalyst combination. Background technique [0002] With the rapid progress of science and technology and the continuous improvement of production and living needs, synthetic materials such as plastics, chemical fibers, and rubbers, additives, organic solvents, medicines, pesticides, paints, dyes, and various organic synthesis intermediates, etc. Production and demand are growing rapidly. Especially since the beginning of the 21st century, the market size of aromatics products has continued to expand, and the production capacity and output of global aromatics plants have continued to increase. At present, the main products of global aromatics are light aromatics such as benzene, toluene and xylene. In recent years, the rapid development of my country's polyester industry has continuously promoted th...

Claims

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Application Information

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IPC IPC(8): B01J29/08C07C7/163C07C15/02
CPCB01J29/084C07C7/163C07C15/02
Inventor 李水荣朱志荣孙晓明赵国庆潘茂华
Owner NINGBO ZHONGJIN PETROCHEM CO LTD
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