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Process for the production of para-alkylated aromatics

A technology for alkylating aromatic hydrocarbons and alkylating reagents, which is applied in the field of aromatic hydrocarbon shape-selective alkylation reactions, and can solve problems such as increased side reactions, low utilization of methanol, and unreasonable distribution of reactants

Active Publication Date: 2016-07-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is the unreasonable distribution of the reactant stream in the single-bed alkylation reactor in the past, resulting in increased side reactions, low methanol utilization, and poor catalyst stability. A method for the production of para-alkylated aromatics, which has the advantages of less side reactions, high methanol utilization, and good catalyst stability

Method used

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  • Process for the production of para-alkylated aromatics
  • Process for the production of para-alkylated aromatics
  • Process for the production of para-alkylated aromatics

Examples

Experimental program
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Embodiment 1～4

[0042] in the instruction manual figure 2 The described multi-bed fixed-bed reactor was filled with 10 g of catalyst A prepared in Comparative Example 1, and the alkylating agent stream was dispersed into equal or unequal multi-stage streams. Different beds of a bed reactor. That is, after the heat exchange, the hydrogen-containing aromatic hydrocarbon stream (I) and the normal temperature first-stage alkylating reagent stream (II) are fully mixed in the first-stage inert material layer, and then enter the first catalyst bed layer of the reactor, After the reaction, the obtained gas stream and the second normal-temperature methanol stream (III) introduced from the second-stage injection port are mixed, gasified and uniformly dispersed in the second-stage inert material layer, and then enter the second catalyst bed of the reactor, After the reaction, the obtained gas stream and the normal temperature methanol stream (IV) introduced by the injection port of the third section a...

Embodiment 5～8

[0044] in the instruction manual image 3 The described multi-stage series-connected fixed-bed reactor is loaded with 10 g of catalyst B prepared in Comparative Example 2, and the alkylating agent stream is dispersed into multiple normal-temperature streams of equal or unequal amounts, respectively entering the multi-stage series-connected fixed bed from multiple injection ports. In the reactor, after heat exchange, the hydrogen-containing aromatic hydrocarbon stream (I) and the first stream of alkylating reagent (II) at normal temperature are mixed and vaporized in the inert layer of the first-stage reactor, and then enter the first-stage reactor. The catalyst bed layer, the gas stream obtained after the reaction and the normal temperature alkylating reagent stream (III) introduced from the injection port in the upper part of the second-stage reactor are mixed, gasified and uniformly dispersed in the ceramic ball layer, and then enter the second-stage reactor. After the react...

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Abstract

The invention relates to a method for producing para-alkylated aromatics, which mainly solves the problems of many side reactions, low utilization rate of raw materials and poor catalyst stability in the existing production method of aromatics alkylation. The present invention uses aromatic hydrocarbon materials and alkylating reagents as raw materials, and the total molar ratio of aromatic hydrocarbon materials and alkylating reagents is 1:10 to 10:1, and the weight space velocity is 1 to 10 hr. -1 , The reaction temperature is 300-500°C, the reaction pressure is 0.1-5.0MPa, and the molar ratio of carrier gas to aromatic hydrocarbon raw material is 1-8, the raw material is contacted with the ZSM molecular sieve catalyst to carry out the shape-selective alkylation reaction, and the alkylation The technical proposal that the reagents are divided into at least two streams solves the problem well, and can be used in the industrial production of p-xylene by alkylation of toluene and methanol.

Description

technical field [0001] The present invention relates to a process for the production of para-alkylated aromatics, in particular to the shape-selective alkylation of aromatics using a multi-bed reactor. Background technique [0002] Aromatic alkylation is a basic method for synthesizing alkyl aromatic hydrocarbons. The number, location and type of alkyl chains on the aromatic ring have a great influence on the physicochemical properties and application value of alkyl aromatic hydrocarbons. In the alkylation of aromatic hydrocarbons, depending on the type of catalyst used, the resulting product can be an equilibrium mixture of coexisting multiple isomers, or a valuable non-equilibrium shape-selective alkylation product. Therefore, the selective synthesis of ethylbenzene, p-xylene and p-toluene is a very important aromatic hydrocarbon alkylation reaction process, which has important scientific value and practical significance. [0003] In recent years, as an important basic pe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C2/86C07C2/66C07C15/08C07C15/02C07C15/073
Inventor 孔德金邹薇夏建超李辉杨德琴
Owner CHINA PETROLEUM & CHEM CORP
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