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Combined method for increase production of paraxylene in arene production

A technology of p-xylene and combination method, which is applied in the combination field of increasing the production of p-xylene in the production of aromatics, can solve the problems of low concentration, high energy consumption, large circulation volume of xylene separation unit and isomerization unit, and achieve concentration Increase, reduce the processing scale, achieve the effect of flexibility

Active Publication Date: 2014-01-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The technical problem to be solved by the present invention is that in the production of p-xylene in the prior art, there are problems such as the low concentration of p-xylene in the mixed xylene, resulting in large circulation of xylene separation unit and isomerization unit, high energy consumption, etc., providing A new production method of p-xylene

Method used

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  • Combined method for increase production of paraxylene in arene production
  • Combined method for increase production of paraxylene in arene production
  • Combined method for increase production of paraxylene in arene production

Examples

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Effect test

Embodiment 1

[0026] according to figure 2 The process shown is based on the C in typical reformed depentanized oil 6 A~C 10 + The composition of various hydrocarbon substances is used as the basic data to investigate the ability of the present invention to produce p-xylene and benzene and the processing scale of each unit. The composition distribution of aromatics sent out from a typical reformer and the flow rate of each component used in this example are shown in Table 1.

[0027] The benzene and carbon nine aromatics transalkylation process unit uses a fixed-bed reactor filled with a β-zeolite catalyst containing 0.05% bismuth. The reaction conditions are: reaction temperature 385 ° C, pressure 3.0 MPa, weight space velocity 2.0 Hour -1 , a hydrogen / hydrocarbon molar ratio of 3.0. Aromatic raw materials are mixed with hydrogen and then passed through the catalyst bed from top to bottom for C 9 + A dealkylation reaction to produce benzene, toluene and C 8 a.

[0028] The toluen...

Embodiment 2

[0044] according to figure 2 The process shown is based on the C in typical reformed depentanized oil 6 A~C 10 + The composition of various hydrocarbon substances is used as the basic data to investigate the ability of the present invention to produce p-xylene and benzene and the processing scale of each unit. The composition distribution of aromatics sent out from a typical reformer and the flow rate of each component used in this example are shown in Table 1.

[0045] The benzene and carbon nine aromatics transalkylation process unit adopts a fixed-bed reactor, and the reactor is filled with a hydrogen-type MCM-22 zeolite catalyst containing 0.30% bismuth. The reaction conditions are: reaction temperature 460°C, pressure 41.0MPa, weight space velocity 3.0 hours -1 , a hydrogen / hydrocarbon molar ratio of 8.0. Aromatic raw materials are mixed with hydrogen and then passed through the catalyst bed from top to bottom for C 9 + A dealkylation reaction to generate benzene,...

Embodiment 3

[0056] according to figure 2 The process shown is based on the C in typical reformed depentanized oil 6 A~C 10 + The composition of various hydrocarbon substances is used as the basic data to investigate the ability of the present invention to produce p-xylene and benzene and the processing scale of each unit. The composition distribution of aromatics sent out from a typical reformer and the flow rate of each component used in this example are shown in Table 1.

[0057] The benzene and carbon nine aromatics transalkylation process unit uses a fixed-bed reactor filled with a hydrogen-type mordenite catalyst containing 0.10% bismuth. The reaction conditions are: reaction temperature 320°C, pressure 1.0MPa, weight space velocity 0.8 Hour -1 , a hydrogen / hydrocarbon molar ratio of 2.0. Aromatic raw materials are mixed with hydrogen and then passed through the catalyst bed from top to bottom for C 9 + A dealkylation reaction to generate benzene, toluene and C 8 a.

[0058...

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Abstract

The invention relates to a combined method for increase production of paraxylene in arene production, which is used for solving the problems that the paraxylene has low concentration in mixed paraxylene, circulating volume of arene treatment is large, requirements of reacting materials are rigorous, energy consumption is high and the like in the prior art in the paraxylene producition. The method is realized by comprising the following steps: adopting mixed materials separated by a reforming unit; feeding C9 arene and the third flow of benzene separated by the reforming unit into a benzene and C9 arene alkyl group transfer process unit for carrying out dealkylation reaction so as to generate second flow of benzene, toluene and C8 arene; feeding the second flow of benzene, oluene and C8 arene into a toluene selectivity dismutation process unit for carrying out toluene selectivity dismutation reaction to generate the C8 arene and benzene steam containing the paraxylene, and obtaining third flow of C8 arene, toluene and benzene, wherein the flow of toluene is returned to the toluene selectivity dismutation process unit; delivering mixture of first flow of C8 arene, second flow of C8 arene and fourth flow of C8 arene to an adsorption separation unit with 12-36 adsorbent bed layers to obtain products of first flow of paraxylene; and delivering the third flow of C8 arene to a crystallization separation unit to obtain products of the fourth flow of C8 arene and the second flow of paraxylene. The above problems can be preferably solved by the technical scheme, and the technical scheme can be used for industrial production of the paraxylene.

Description

technical field [0001] The invention relates to a combined method for increasing the production of p-xylene in the production of aromatic hydrocarbons. Background technique [0002] P-xylene is one of the main basic organic raw materials in the petrochemical industry. It is widely used in many chemical production fields such as chemical fibers, synthetic resins, pesticides, medicines, and plastics. The typical production method of p-xylene is from the thermodynamically balanced xylene containing ethylbenzene, that is, C8 aromatics generated by catalytic reforming of naphtha, through multi-stage cryogenic crystallization separation or molecular sieve simulated moving bed adsorption separation (adsorption separation for short) Technology to separate p-xylene from a mixture of isomers with similar boiling points. For the treatment of ortho- and meta-xylene, C 8 A isomerization (referred to as isomerization) technology to isomerize it into p-xylene. In order to increase the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/08C07C6/12C07C7/12C07C7/14B01J29/44B01J29/78B01J29/26B01J29/48
CPCY02P20/52
Inventor 肖剑钟禄平孔德金杨卫胜卢咏琰
Owner CHINA PETROLEUM & CHEM CORP